Limited slip diff

[toger13]

hi i have a saxo turbo running a be gearbox (larger box from the bigger pug citroen models) i currently have a queife atb diff in but at the min under hard boost it just weaves from side to side takes up 2 lanes which isnt good i have been advised to fit a proper lsd rather than the atb

the atb was awsome before i turboed it but now i think its just constantly swooping the power/torque for m wheel to wheel causing the swerve

i have been told a gripper diff is a good option but just wonderd what other options and pros and cons of them

Thanks
Si

[anonymous-user]

I'd be looking at minimising the scrub radius of the steering axis, and maybe trying a different tyre to minimise conicicity of the contact patch.

[toger13]

i dont think its a geomy issue i think its just the power making the diff do really what its ment to but cos the cars so light is swerves left to right and back lol

Thanks
Si

[GavinPearson]

No, it's geometry.

[Marf]

Yes, definitely not the diff. I had a quiafe copy in my last car, it would only pull when going over bumpy ground, otherwise it would just pull straight.

[stevieturbo]

It's all about geometry, and of course tyres.

[stevesingo]

Are you still using the standard wheels?

If not what size and offset are the standard wheels and the wheels you have?

Steve

[HereBeMonsters]

Let me guess? Lowered on cheap spings, standard dampers and 17" wheels with ditchfinders?

[Marf]

Lowered? Check.
Big wheels? Check.

[HereBeMonsters]

What engine is it running?

Only other thing to check is if you've managed to mate a BE 'box to the TU engine (why? I wouldn't know) is the weight hanging over the left front wheel. Other than the geometry. Did anyone mention the geometry? I strongly suggest you check the geometry.

[toger13]

well wheels are same as standard offset 16 inch light weight wheels with toyo t1-r 215/40/16

250lbs front coilover springs
bilstein group n front inserts
peugeot sport front coil over setup
citroen sport bottom arms
comp brake adjustable top mounts

rear is

pug sport 22mm torsion bars
pugsport 25mm anti roll bar
bilsteing group n tarmac spec dampers

so not some peasent spec like your all making out as its a saxo best part of 3k of suspension on this car

its running in the region on 350hp @ wheels

ma boxes fall out of with standard power so with this power it wouldnt stand a chance its also a proper pug sport bell housing with some internals i sourced

im not doubting it could be the geomy settings i just think it was fine before the extra power

a tuning company i have contacted said they had an atb in there 106 turbo and it was less stable in a straight line with the atb than the standard diff they fitted a gripper and fault cures

Si

[Marf]

toger13 said:

so not some peasent spec like your all making out as its a saxo best part of 3k of suspension on this car

Wasn't making out you might have pov spec suspension, just that it is lowered, different from standard and likely not setup correctly.

toger13 said:

a tuning company i have contacted said they had an atb in there 106 turbo and it was less stable in a straight line with the atb than the standard diff they fitted a gripper and fault cures

Si

Odd, I moved from a Gripper to an ATB and found the ATB far superior. The Gripper locked up very aggressively making the car torque steer all over road imperfections and made it difficult to balance on the throttle in corners as it was so on/off.

I found the ATB to be far more drivable, admittedly I did have far less power, but I can only see the things I experienced being more exaggerated with higher power.

If it were me, I'd take it to WIM to get the geo setup and also be looking at moving down a wheel size and up a tyre profile or two. Possibly even down to 14" wheels with 55 profile tyres if the brake setup allows.

Edited by Marf on Thursday 1st July 18:52

[toger13]

well we have a decent geomy mechine at work i can adjust it on so thats not an issue i havent done it for abit just waiting to put my new engine in first

as for wheel size im abit limited at the mo i need at least 16 inch wheels to fit over the 300mm brakes and it rubs with 40 profile tyre lol

if you all think its geomy i will get the engine back in before and do that before spending on an diff

Si

[Slinky]

toger13 said:

well we have a decent geomy mechine at work i can adjust it on so thats not an issue i havent done it for abit just waiting to put my new engine in first

as for wheel size im abit limited at the mo i need at least 16 inch wheels to fit over the 300mm brakes and it rubs with 40 profile tyre lol

if you all think its geomy i will get the engine back in before and do that before spending on an diff

Si

Whilst you may have a geometry machine at work, do you know exactly what settings you need to change to attempt to resolve the problem?

Oh and have some of these "........" ",,,,,,,,,," "???????" " "

[HereBeMonsters]

Oh, and if you can't spell "geometry" then I very much doubt you'll be able to set it up properly.

[agent006]

HereBeMonsters said:

Oh, and if you can't spell "geometry" then I very much doubt you'll be able to set it up properly.

Dyslexia and Dyscalculia aren't necessarily related. Neither are related to iq.

[HereBeMonsters]

agent006 said:

HereBeMonsters said:

Oh, and if you can't spell "geometry" then I very much doubt you'll be able to set it up properly.

Dyslexia and Dyscalculia aren't necessarily related. Neither are related to iq.

It's not dyslexia, it's pure ignorance. It's plainly spelt in many places on this page, but the OP seems to begin the word, then just give up half way through. Then put a "y" on the end.

[Slinky]

toger13 said:

Well cheers for all the advise tts!

Im a Mercedes-Benz Diagnostic Tech

I wont be coming on here again.

Thanks
Si

Wow, you found your shift key and punctuation, don't let the door smack you in the arse on the way out..

[dan19evans]

Slinky said:

toger13 said:

Well cheers for all the advise tts!

Im a Mercedes-Benz Diagnostic Tech

I wont be coming on here again.

Thanks
Si

Wow, you found your shift key and punctuation, don't let the door smack you in the arse on the way out..

[stevesingo]

toger13 said:

well wheels are same as standard offset 16 inch light weight wheels with toyo t1-r 215/40/16

Sorry, that does not answer the question. You are saying the wheels are 16" diameter with a standard offset.
Fill in the gaps...

What width are the wheels fitted?
What width are the standard wheels?

This is important! A 7" wide wheel will need a different offset to an 8" wide wheel to maintain the same scrub radius.

What diameter are the standard wheels?

Less important, but if you are using a lower profile tyre there will be less give in the side wall and therefore more direct relationship between tyre contact patch and suspension.

Steve