@kinghorus123

  <fInitialDragCoeff value="**********" />
  <fInitialDriveForce value="**********" />
  <fInitialDriveMaxFlatVel value="**********" />
  <fTractionCurveMin value="**********" />

Those are the main parameters in 'handling.meta' that affect top speed.

<fInitialDriveMaxFlatVel value= Top speed limit - Raise this to increase top speed limit.
Note: On average raising this in it's own is unlikely to raise the top speed by much. The other settings here usually need to be tweaked also to allow the car to actually hit that high top speed limit.
Set this to '<fInitialDriveMaxFlatVel value="1000.0000" />' (that's ~820mph, roughly) or something high to start with so it is taken out of the way while you test the other parameters. That way you can be sure of seeing the effect of altering the other parameters without hitting this top speed limit.

<fInitialDragCoeff value= Drag, lower it for less drag. ie Higher potential Top Speed.
Note: Less drag will also increase acceleration. This will be more pronounced at higher speeds but is for the most part a far more subtle effect (compared to the increase in acceleration of raising '<fTractionCurveMin' or '<fInitialDriveForce' for example). Try lowering this & test top speed in-game before altering the settings below as this is least likely to mess with the handling feel of your car while allowing you to hit a higher top speed.

<fInitialDriveForce value= Power delivered to wheels. Raise this for more power.
Note: This will also increase acceleration (& low speed wheel spin. <fLowSpeedTractionLossMult (or <fTractionCurveMin value= (See below)) value can be used to compensate) so if you want a correct 0-60 time you'll have to be careful tweaking this.

<fTractionCurveMin value= This is the ideal grip of the wheels when driving in a straight line. Increase for more straight line grip. At high speed more grip = more ability to push past drag effect = Higher Top Speed.
Note: This setting should ideally be altered in tandem with '<fTractionCurveMax' (grip when tire is sliding sideways). Increasing this will also increase acceleration (& probably braking although I have not tested that) so although it can be used to reduce wheel spin at low speed it will also increase acceleration at the same time which is usually not desirable.

As with most things in GTA V car handling is all about balance so you will often find yourself having to tweak other parameters to compensate for changes you have made (I cover a few above but there are many more). I reckon lowering drag should be enough to get you started & do remember when modding GTA V to ALWAYS make a backup. Best of luck

Ok, best of luck

@Doncato
I edited my previous post with more info before I had realised you had replied. If you haven't noticed already have a read over it again & see if any of the suggestions work.

@Doncato
Hmmm? Not sure what could be making OpenIV unable to save? Have you successfully edited any files inside OpenIV previously?

Maybe open Task Manager (Ctrl+Shift+Escape) & make sure GTA V is not running?

Restart your computer also, just to free up anything that may be using the file (windows indexer etc) & stopping it being edited & try again.

If that doesn't work try extracting the 'carcols.ymt' to some location & editing it with Notepad++ (Any text editor will do (Notepad etc) but Notepad++ is much easier to work with & I reccommend moving to that as soon as you start modding GTA V. You'll thank me later )

In OpenIV, right-click the 'carcols.ymt' & select 'Export to META/XML (.xml)' (Shortcut is Ctrl+S)
Export the file to Desktop etc
Open with Notepad++ etc
Edit the file
Save it
Drag & Drop it back into OpenIV

^This way should work for sure

Note: Do NOT rename the extension (.ymt.xml). OpenIV will convert it to '.ymt' when you drop it into the '.rpf'.

Make a backup of carcols (or ANY file you plan on editing) before proceeding.

@Arodriguez253
Remove the add-on Challenger (you just have to remove the 'dlclist.xml' entry line for it) so that it is eliminated as a cause of the crash.
I'm guessing it's this Charger you are talking about but if not give me a link to the car you downloaded
If I guessed the correct car run through the full Replace method again (after removing ^Challenger):

"-(FULL REPLACE)-

1. Add new line close to the bottom:
   dlcpacks:\16charger
   to file .\update\update.rpf\common\data\dlclist.xml

2. Copy the "16charger" folder from the "\1. Install Files\1b. Full Replace (Buffalo2)" folder into the dlcpacks folder:
   .\update\x64\dlcpacks\16charger

3. "Tire Texture" folder content goes into vehshare.ytd on two locations:

• .\x64e.rpf\levels\gta5\vehicles.rpf\vehshare.ytd
• .\x64w.rpf\dlcpacks\mpbeach\dlc.rpf\x64\levels\gta5\vehicles\mpbeachvehicles.rpf\vehshare.ytd

4. In order for the dials and handling to work properly, replace files:
   .\update\update.rpf\common\data\levels\gta5\vehicles.meta
   .\update\update.rpf\common\data\handling.meta
   with the 2 meta files in folder "\1. Install Files\1b. Full Replace (Buffalo2)"

5. Spawn carname using a trainer: buffalo2"

That should get you back to a buffalo2 Charger replace with working upgrades.

So in short, remove the Challenger, run through the Full Replace for the buffalo2 Charger again, play the game & see if the Charger upgrades work as intended & whether you are still having crashes & we'll take it from there

@stallion007
If you're still stuck, screenshots would help

@Doncato
Does AlperB's BMW M6 E63 [Tuning] have the same problem for you with the floating tuning parts or are you just wondering why there is no carcols info?
The lack of carcols info is because AlperB has set the car up to use the default schwarzer carcols info so there is no need to edit carcols.ymt when installing the BMW M6 E63. It should work as long as the carcols info for the schwarzer in carcols.ymt

\mods\update\update.rpf\x64\data\carcols.ymt

is default & hasn't been edited (for a previous different replace of the schwarzer etc).

The 'schwarzer.yft', 'schwarzer_hi.yft' & 'schwarzer.ytd' should be installed here:

\mods\update\x64\dlcpacks\patchday1ng\dlc.rpf\x64\levels\gta5\vehicles.rpf\ ** place files here **

& the 'schwarzer_mods.rpf' should be here:

\mods\x64i.rpf\levels\gta5\vehiclemods\schwarzer_mods.rpf

Note: Do a search in OpenIV (Ctrl+F3) for 'schwarzer_mods.rpf' & make sure you only have one 'schwarzer_mods.rpf' file in your game in the above location. If you have more than one either remove the extra/s or be sure to replace them all with the one from the BMW M6 E63 download as well.

I'll test it the now but as long as the files are where they are supposed to be the car should work correctly. We'll see

Edit -

Confirmed all tuning parts work correctly with default schwarzer carcols.ymt settings
https://pasteboard.co/HeTFWJB.png
If the tuning parts are flying above car etc make sure the schwarzer carcols.ymt settings look like this:

    <Item>
      <kitName>53_schwarzer_modkit</kitName>
      <id value="58"/>
      <kitType>MKT_SPORT</kitType>
      <visibleMods>
        <Item>
          <modelName>schwarzer_wing_1</modelName>
          <modShopLabel>MNU_WING5</modShopLabel>
          <linkedModels/>
          <turnOffBones/>
          <type>VMT_SPOILER</type>
          <bone>boot</bone>
          <collisionBone>chassis</collisionBone>
          <cameraPos>VMCP_DEFAULT</cameraPos>
          <audioApply value="1.00000000"/>
          <weight value="0"/>
          <turnOffExtra value="false"/>
          <disableBonnetCamera value="false"/>
          <allowBonnetSlide value="true"/>
          <weaponSlot value="0"/>
          <disableProjectileDriveby value="false"/>
          <disableDriveby value="false"/>
        </Item>
        <Item>
          <modelName>schwarzer_wing_2</modelName>
          <modShopLabel>MNU_WING4</modShopLabel>
          <linkedModels/>
          <turnOffBones/>
          <type>VMT_SPOILER</type>
          <bone>boot</bone>
          <collisionBone>mod_col_1</collisionBone>
          <cameraPos>VMCP_DEFAULT</cameraPos>
          <audioApply value="1.00000000"/>
          <weight value="0"/>
          <turnOffExtra value="false"/>
          <disableBonnetCamera value="false"/>
          <allowBonnetSlide value="true"/>
          <weaponSlot value="0"/>
          <disableProjectileDriveby value="false"/>
          <disableDriveby value="false"/>
        </Item>
        <Item>
          <modelName>schwarzer_wing_4</modelName>
          <modShopLabel>MNU_WING8</modShopLabel>
          <linkedModels/>
          <turnOffBones/>
          <type>VMT_SPOILER</type>
          <bone>boot</bone>
          <collisionBone>mod_col_2</collisionBone>
          <cameraPos>VMCP_DEFAULT</cameraPos>
          <audioApply value="1.00000000"/>
          <weight value="0"/>
          <turnOffExtra value="false"/>
          <disableBonnetCamera value="false"/>
          <allowBonnetSlide value="true"/>
          <weaponSlot value="0"/>
          <disableProjectileDriveby value="false"/>
          <disableDriveby value="false"/>
        </Item>
        <Item>
          <modelName>schwarzer_exh_1</modelName>
          <modShopLabel>MNU_EXH3</modShopLabel>
          <linkedModels/>
          <turnOffBones>
            <Item>misc_e</Item>
            <Item>exhaust</Item>
            <Item>exhaust_2</Item>
          </turnOffBones>
          <type>VMT_EXHAUST</type>
          <bone>chassis</bone>
          <collisionBone>chassis</collisionBone>
          <cameraPos>VMCP_DEFAULT</cameraPos>
          <audioApply value="0.50000000"/>
          <weight value="0"/>
          <turnOffExtra value="false"/>
          <disableBonnetCamera value="false"/>
          <allowBonnetSlide value="true"/>
          <weaponSlot value="0"/>
          <disableProjectileDriveby value="false"/>
          <disableDriveby value="false"/>
        </Item>
        <Item>
          <modelName>schwarzer_exh_2</modelName>
          <modShopLabel>MNU_EXH11</modShopLabel>
          <linkedModels/>
          <turnOffBones>
            <Item>misc_e</Item>
            <Item>exhaust</Item>
            <Item>exhaust_2</Item>
          </turnOffBones>
          <type>VMT_EXHAUST</type>
          <bone>chassis</bone>
          <collisionBone>chassis</collisionBone>
          <cameraPos>VMCP_DEFAULT</cameraPos>
          <audioApply value="0.65000000"/>
          <weight value="0"/>
          <turnOffExtra value="false"/>
          <disableBonnetCamera value="false"/>
          <allowBonnetSlide value="true"/>
          <weaponSlot value="0"/>
          <disableProjectileDriveby value="false"/>
          <disableDriveby value="false"/>
        </Item>
        <Item>
          <modelName>schwarzer_exh_3</modelName>
          <modShopLabel>MNU_EXH12</modShopLabel>
          <linkedModels/>
          <turnOffBones>
            <Item>misc_e</Item>
            <Item>exhaust</Item>
            <Item>exhaust_2</Item>
          </turnOffBones>
          <type>VMT_EXHAUST</type>
          <bone>chassis</bone>
          <collisionBone>chassis</collisionBone>
          <cameraPos>VMCP_DEFAULT</cameraPos>
          <audioApply value="0.85000000"/>
          <weight value="0"/>
          <turnOffExtra value="false"/>
          <disableBonnetCamera value="false"/>
          <allowBonnetSlide value="true"/>
          <weaponSlot value="0"/>
          <disableProjectileDriveby value="false"/>
          <disableDriveby value="false"/>
        </Item>
        <Item>
          <modelName>schwarzer_exh_4</modelName>
          <modShopLabel>MNU_EXH6</modShopLabel>
          <linkedModels/>
          <turnOffBones>
            <Item>misc_e</Item>
            <Item>exhaust</Item>
            <Item>exhaust_2</Item>
          </turnOffBones>
          <type>VMT_EXHAUST</type>
          <bone>chassis</bone>
          <collisionBone>chassis</collisionBone>
          <cameraPos>VMCP_DEFAULT</cameraPos>
          <audioApply value="1.00000000"/>
          <weight value="0"/>
          <turnOffExtra value="false"/>
          <disableBonnetCamera value="false"/>
          <allowBonnetSlide value="true"/>
          <weaponSlot value="0"/>
          <disableProjectileDriveby value="false"/>
          <disableDriveby value="false"/>
        </Item>
        <Item>
          <modelName>schwarzer_race_int</modelName>
          <modShopLabel>MNU_CAGE</modShopLabel>
          <linkedModels/>
          <turnOffBones>
            <Item>misc_a</Item>
          </turnOffBones>
          <type>VMT_CHASSIS</type>
          <bone>chassis</bone>
          <collisionBone>chassis</collisionBone>
          <cameraPos>VMCP_DEFAULT</cameraPos>
          <audioApply value="1.00000000"/>
          <weight value="0"/>
          <turnOffExtra value="false"/>
          <disableBonnetCamera value="false"/>
          <allowBonnetSlide value="true"/>
          <weaponSlot value="0"/>
          <disableProjectileDriveby value="false"/>
          <disableDriveby value="false"/>
        </Item>
        <Item>
          <modelName>schwarzer_grill_1</modelName>
          <modShopLabel>SCHWAR_GRILL</modShopLabel>
          <linkedModels/>
          <turnOffBones>
            <Item>misc_c</Item>
          </turnOffBones>
          <type>VMT_GRILL</type>
          <bone>bonnet</bone>
          <collisionBone>chassis</collisionBone>
          <cameraPos>VMCP_DEFAULT</cameraPos>
          <audioApply value="1.00000000"/>
          <weight value="0"/>
          <turnOffExtra value="false"/>
          <disableBonnetCamera value="false"/>
          <allowBonnetSlide value="true"/>
          <weaponSlot value="0"/>
          <disableProjectileDriveby value="false"/>
          <disableDriveby value="false"/>
        </Item>
        <Item>
          <modelName>schwarzer_roof</modelName>
          <modShopLabel>MNU_ROOFC</modShopLabel>
          <linkedModels/>
          <turnOffBones>
            <Item>misc_b</Item>
          </turnOffBones>
          <type>VMT_ROOF</type>
          <bone>chassis</bone>
          <collisionBone>chassis</collisionBone>
          <cameraPos>VMCP_DEFAULT</cameraPos>
          <audioApply value="1.00000000"/>
          <weight value="0"/>
          <turnOffExtra value="false"/>
          <disableBonnetCamera value="false"/>
          <allowBonnetSlide value="true"/>
          <weaponSlot value="0"/>
          <disableProjectileDriveby value="false"/>
          <disableDriveby value="false"/>
        </Item>
        <Item>
          <modelName>schwarzer_bonnet_1</modelName>
          <modShopLabel>MNU_BONC</modShopLabel>
          <linkedModels/>
          <turnOffBones>
            <Item>bonnet</Item>
          </turnOffBones>
          <type>VMT_BONNET</type>
          <bone>bonnet</bone>
          <collisionBone>chassis</collisionBone>
          <cameraPos>VMCP_DEFAULT</cameraPos>
          <audioApply value="1.00000000"/>
          <weight value="0"/>
          <turnOffExtra value="false"/>
          <disableBonnetCamera value="false"/>
          <allowBonnetSlide value="true"/>
          <weaponSlot value="0"/>
          <disableProjectileDriveby value="false"/>
          <disableDriveby value="false"/>
        </Item>
        <Item>
          <modelName>schwarzer_side_1</modelName>
          <modShopLabel/>
          <linkedModels/>
          <turnOffBones/>
          <type>VMT_SKIRT</type>
          <bone>chassis</bone>
          <collisionBone>chassis</collisionBone>
          <cameraPos>VMCP_DEFAULT</cameraPos>
          <audioApply value="1.00000000"/>
          <weight value="0"/>
          <turnOffExtra value="false"/>
          <disableBonnetCamera value="false"/>
          <allowBonnetSlide value="true"/>
          <weaponSlot value="0"/>
          <disableProjectileDriveby value="false"/>
          <disableDriveby value="false"/>
        </Item>
        <Item>
          <modelName>schwarzer_side_2</modelName>
          <modShopLabel/>
          <linkedModels/>
          <turnOffBones/>
          <type>VMT_SKIRT</type>
          <bone>chassis</bone>
          <collisionBone>chassis</collisionBone>
          <cameraPos>VMCP_DEFAULT</cameraPos>
          <audioApply value="1.00000000"/>
          <weight value="0"/>
          <turnOffExtra value="false"/>
          <disableBonnetCamera value="false"/>
          <allowBonnetSlide value="true"/>
          <weaponSlot value="0"/>
          <disableProjectileDriveby value="false"/>
          <disableDriveby value="false"/>
        </Item>
        <Item>
          <modelName>schwarzer_bumr_2</modelName>
          <modShopLabel>MNU_BUMR2</modShopLabel>
          <linkedModels/>
          <turnOffBones/>
          <type>VMT_BUMPER_R</type>
          <bone>bumper_r</bone>
          <collisionBone>chassis</collisionBone>
          <cameraPos>VMCP_DEFAULT</cameraPos>
          <audioApply value="1.00000000"/>
          <weight value="0"/>
          <turnOffExtra value="false"/>
          <disableBonnetCamera value="false"/>
          <allowBonnetSlide value="true"/>
          <weaponSlot value="0"/>
          <disableProjectileDriveby value="false"/>
          <disableDriveby value="false"/>
        </Item>
        <Item>
          <modelName>schwarzer_bumf_1</modelName>
          <modShopLabel>SCHWAR_BUM1</modShopLabel>
          <linkedModels/>
          <turnOffBones/>
          <type>VMT_BUMPER_F</type>
          <bone>bumper_f</bone>
          <collisionBone>chassis</collisionBone>
          <cameraPos>VMCP_DEFAULT</cameraPos>
          <audioApply value="1.00000000"/>
          <weight value="0"/>
          <turnOffExtra value="false"/>
          <disableBonnetCamera value="false"/>
          <allowBonnetSlide value="true"/>
          <weaponSlot value="0"/>
          <disableProjectileDriveby value="false"/>
          <disableDriveby value="false"/>
        </Item>
        <Item>
          <modelName>schwarzer_intercooler</modelName>
          <modShopLabel>SCHWAR_BUM3</modShopLabel>
          <linkedModels/>
          <turnOffBones>
            <Item>misc_d</Item>
          </turnOffBones>
          <type>VMT_BUMPER_F</type>
          <bone>chassis</bone>
          <collisionBone>chassis</collisionBone>
          <cameraPos>VMCP_DEFAULT</cameraPos>
          <audioApply value="1.00000000"/>
          <weight value="0"/>
          <turnOffExtra value="false"/>
          <disableBonnetCamera value="false"/>
          <allowBonnetSlide value="true"/>
          <weaponSlot value="0"/>
          <disableProjectileDriveby value="false"/>
          <disableDriveby value="false"/>
        </Item>
        <Item>
          <modelName>schwarzer_splitter_1</modelName>
          <modShopLabel>MNU_BUMF7</modShopLabel>
          <linkedModels>
            <Item>schwarzer_intercooler2</Item>
          </linkedModels>
          <turnOffBones>
            <Item>misc_d</Item>
          </turnOffBones>
          <type>VMT_BUMPER_F</type>
          <bone>bumper_f</bone>
          <collisionBone>chassis</collisionBone>
          <cameraPos>VMCP_DEFAULT</cameraPos>
          <audioApply value="1.00000000"/>
          <weight value="0"/>
          <turnOffExtra value="false"/>
          <disableBonnetCamera value="false"/>
          <allowBonnetSlide value="true"/>
          <weaponSlot value="0"/>
          <disableProjectileDriveby value="false"/>
          <disableDriveby value="false"/>
        </Item>
      </visibleMods>
      <linkMods>
        <Item>
          <modelName>schwarzer_intercooler2</modelName>
          <bone>chassis</bone>
          <turnOffExtra value="false"/>
        </Item>
      </linkMods>

Note: be sure to replace just what I have posted starting & ending in the same place (I missed out the schwarzer horn settings to save space posting here).

@Doncato
Sounds like your 'carcols.ymt/.meta' information is incorrect/not installed etc. Make sure you have inserted the carcols data provided in the car mod to the correct 'carcols.ymt/.meta' file using OpenIV.
There are multiple 'carcols.ymt/.meta' file locations containing the same vehicles. Any installed in 'update.rpf' (usually in 'carcols.ymt' or in the 'dlc_patch' folder structures) will override other locations of the same file.

Example:

\mods\update\update.rpf\dlc_patch\mpbusiness\common\data\carcols.meta

will override

\mods\x64w.rpf\dlcpacks\mpbusiness\dlc.rpf\common\data\carcols.meta

so in this case you would make sure the carcols data is inserted in the 'carcols.meta' here:

\mods\update\update.rpf\dlc_patch\mpbusiness\common\data\carcols.meta

Carcols.ymt:

'carcols.ymt' is installed here:

\mods\update\update.rpf\x64\data\carcols.ymt

or here:

\mods\x64a.rpf\data\carcols.ymt (if the above^ update.rpf carcols doesn't exist)

'carcols.ymt' can now be edited inside OpenIV (right-click>'Edit'). I mention this as if you have been using external editors (Notepad++ etc) to edit files & don't have a decrypted 'carcols.ymt' installed you will not have been able to access & edit that file yet.
Knowing exactly what car (mod page link would be ideal) you are trying to install will allow me to be more specific if you need further help

@crunching Nice one

@Reacon Yeah, that works too ( @crunching ie you can place whatever car you want to replace in the highest numbered patchday*ng folder you have & the game should always use it. I don't actually have 'patchday18ng', so I would put replace vehicles in 'patchday16ng' as it is the highest I have, as an example).

@crunching
There are multiple locations of the same vehicles. You have to replace the correct one which is usually the one located in the highest numbered patchday*ng.
You can search for stuff in OpenIV by pressing Ctrl+F3 (or 'Tools' tab> 'Search')

The 'police3' you need to replace is most likely the files located here:

\mods\update\x64\dlcpacks\patchday4ng\dlc.rpf\x64\levels\gta5\vehicles.rpf\police3.yft

You may have other problems though as I have only one location for the 'buffalo':

\mods\x64e.rpf\levels\gta5\vehicles.rpf\buffalo.yft

so you should have found the right one & replaced it correctly in which case more info (Scripthook installed? Using 'mods' folder? Previous replaces working? etc) & further investigation may be required.