Jump to content

Adding an LSD unit to a stock, OEM differential


mindspin311
 Share

Recommended Posts

So, nothing specific in the rules about adding an aftermarket LSD unit to an otherwise stock, OEM diff. What's the points, if any?

 

Take generic RWD vehicle, add a Quaife, Kaaz, MFactory, etc aftermarket LSD, put it back together with no other changes.

 

Quote

differential swap: 25pts for any diff. from a vehicle on the VPI list, stock axles/CVs
included

 

I'm not performing the action of swapping a diff from another car, so....

Link to comment
Share on other sites

Actually, you need to get a ruling from tech.

 

Taken from the 2018 rules:

 

differential swap: 25pts for any diff. from a vehicle on the VPI list, stock axles/CVs included

 

So, it looks like there is no value listed in the rules that will help with this question.  My guess is that the points value will be somewhere between 25 and 100 pts.

 

Edited by wvumtnbkr
  • Like 1
Link to comment
Share on other sites

3 hours ago, DRVOLKS said:

I think they should not be any points on an LSD most fast street cars on the list have them stock. You do not pick a build because it came with an LSD.

Bob Mann

I wouldn’t have picked my car if it didn’t have LSD.

 

On topic, @wvumtnbkr is correct, you have to ask tech because that specific modification is not mentioned in the rule book. Value should be >25 points to swap the lockup unit inside a diff housing.

 

if it were up to me, I would not open the bag of worms of high performance variable lockup racing diffs. You get your choice of stock diff, or stock diff from some car on the list for 25 points. Nothing else. (Weld as desired).

 

and please copy the answer from tech into this thread so that I can then harass Mike and Phil into getting the new rule added to the rule book... email rules have a habit of not being added...

Edited by enginerd
  • Like 3
  • Thanks 1
Link to comment
Share on other sites

4 hours ago, DRVOLKS said:

I think they should not be any points on an LSD most fast street cars on the list have them stock. You do not pick a build because it came with an LSD.

Bob Mann

Whhhhaaattt?  That is one mod that can make a huge laptime difference.

 

Also, an aftermarket unit can create a bigger difference due to adjustability.

 

I picked my chassis partly because lsd.

Link to comment
Share on other sites

1 hour ago, enginerd said:

if it were up to me, I would not open the bag of worms of high performance variable lockup racing diffs. You get your choice of stock diff, or stock diff from some car on the list for 25 points. Nothing else. (Weld as desired).

 

If it were up to me, I would not open the bag of worms of high performance springs/dampers/bushings/radiators/etc. You get your choice of stock parts, or stock parts from some car on the list for X points. Nothing else.

 

There's a bunch of bags of worms. They've all been opened. Just because BMWs have OEM replacement options for LSDs doesn't mean you should restrict other makes.

  • Like 2
Link to comment
Share on other sites

This thread looks to have the highest bias yet for - if it works on my car then it should be free but if it doesn't apply to my car then it should not be allowed.  :lol:

 

For those that want to outlaw aftermarket diffs - why stop at diffs, what about aftermarket control arms, intakes, heads, cams, etc.

For those that support free diffs - do you perhaps need one?

For the MR2 dude that only wants parts from the list - so no headers, engine swaps, cams, etc.?

 

:lol::lol:

  • Like 4
Link to comment
Share on other sites

1 hour ago, LAMR2 said:

 

If it were up to me, I would not open the bag of worms of high performance springs/dampers/bushings/radiators/etc. You get your choice of stock parts, or stock parts from some car on the list for X points. Nothing else.

 

There's a bunch of bags of worms. They've all been opened. Just because BMWs have OEM replacement options for LSDs doesn't mean you should restrict other makes.

Miatas also have options.  We have a 4.3 ration Torsen Type II from a 99 miata in our 93 which came with a 4.1 VLSD (trash).  We claim this as a diff swap from a vehicle on the list at 25pts.  This has been clarified by Phil

Link to comment
Share on other sites

2 hours ago, Miata PI said:

This is not the case, as per Phil.  If it didnt come in your car and you didnt do a platform swap then its 25pts (as long as its on the list)

The problem is that aftermarket diffs arent on the list.

 

If I have generic automobile with a generic open diff, what's the cost to go to the local speed shop and buy the aftermarket diff made for my generic car with open diff?

 

It's not a diff swap from another car. It's a modification to a factory part already on my car.

Link to comment
Share on other sites

I really don't know what is causing people heartache here.

 

If I were running a completely stock Mustang I can run some non-OE heads for 100 points.  Those heads can be $80 GT40's from the local Pick-N-Pull or they can be $3,000 AFR's.

I can spend $2,000 putting in a tubular K-member and tubular control arms for 35 points.

For $600 I could put in a new aluminum driveshaft for 50 points.  Or I could get that aluminum driveshaft for $67 from Pick-N-Pull from an Aerostar.

 

For $700 and I would presume 25 points I can swap out the diff (the unit that is located inside the housing) to a performance unit.

 

Note: these are Canadian prices.  What seems most out of place here?  Does a $67 aluminum driveshaft add 50 points of performance?

  • Like 2
Link to comment
Share on other sites

13 hours ago, mindspin311 said:

The problem is that aftermarket diffs arent on the list.

 

If I have generic automobile with a generic open diff, what's the cost to go to the local speed shop and buy the aftermarket diff made for my generic car with open diff?

 

It's not a diff swap from another car. It's a modification to a factory part already on my car.

To what @zack_280 said, as much as I dont agree with it, prove it...  Claim the LSD for 25pts and move on

Link to comment
Share on other sites

30 minutes ago, Miata PI said:

To what @zack_280 said, as much as I dont agree with it, prove it...  Claim the LSD for 25pts and move on

If I hear it clicking coming off the track, I would protest.

 

The mentality of "if you can get away with, you should do it" is the mentality of a 4 year old.

 

Why not just put a VQ30 valve cover on it?

  • Like 4
  • Thanks 1
Link to comment
Share on other sites

27 minutes ago, wvumtnbkr said:

If I hear it clicking coming off the track, I would protest.

 

The mentality of "if you can get away with, you should do it" is the mentality of a 4 year old.

 

Why not just put a VQ30 valve cover on it?

 

If you hear it clicking, they aren't doing the "bought a diff" game right....

 

Without crazy amounts of teardown, i think from a practical standpoint it is hard to enforce. 

Link to comment
Share on other sites

14 minutes ago, Black Magic said:

 

If you hear it clicking, they aren't doing the "bought a diff" game right....

 

Without crazy amounts of teardown, i think from a practical standpoint it is hard to enforce. 

a lot of the aftermarket diffs I have been around make the wheels pop or click when making tight turns (like to go behind the wall).  Maybe they were just overly tight?

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

 Share

×
×
  • Create New...