mac853

Ok, thanks for suggestions, they are so good to try!
Could anybody tell me which springs of other brands is same or even softer than 2.3?
How about if i wonder to use 3 holes piston?

best regards

porsche928gs

Right of the bat, your car is too heavy upfront. Is like a poorly balanced front wheel drive car. It's because your ride height, 4.8f 5.4 rear. It will understeer severely when braking or off power. Second your rear diff oil is too thick, try 2000k

mac853

That you mean higher front height, set from 4.8 to 5.0, but i think is not enough to makes difference.
Anyway, why nobody tell me if worth use 3 holes piston?

Best regards

porsche928gs

Yes, raise your front end. Make it even or no more than.2 difference (lower). Is better to change oil than to have different piston sizes.

daleburr

I think you're too soft on the springs and too heavy on the damping, resulting in a lazy sluggish car. I don't even run 2.3 in the wet as they're too soft.

Go to 2.7f and 2.5r, and 30wt oil all round.

Also reduce your rear camber to 1.5deg, this will give better direction change and more HS steering, while improving traction on the power.

And as others have said, drop the diff oil to around 2k.

The pistons are fine, those are what everyone uses with the T4.

mac853

But I run on bumpy and surface is going losing grip to be old

daleburr

Sounds like every outdoor track in the UK lol.

Is this carpet or asphalt?

If it's bumpy you may need to raise your rideheight, 5.5 to 6mm is common for bumpy asphalt tracks.

A progressive spring like the Xray 2.5-2.8 or Reflex Silver are also a good option for that type of surface, they tend to soak up the bumps a little better without resulting in too much body roll.

mac853

Is asphalt, you mean progressive spring all round?
Reflex Silver, what hardness if compare with original spring?

Best regards

Skiddins

The 'closest' spring would be Xray 2.5-2.8 progressive

mac853

Ok, thanks!

jlfx car audio

iTrader: (37)

I wonder why u ran front at 4.8 on a bumpy asphalt track?
If it was my car I would run
2.3-2.6 progressive f&r
300 all corners
Low role blocks in front mid in rear .
Lots of droop in rear / very little in front .lol
And ride height around 6mm.
Seemed to work last time I ran low traction bumpy track

mac853

Lot droops rear less in front, but i have heard more in the front before.
And 6mm height is too much, maybe next time i should run 5mm front and 5.2 rear.
Front 6 with rear 4 in downstop, i think is only way

But what do you mean low roll blocks?

jlfx car audio

iTrader: (37)

We had a really bumpy surface . yes more droop in front does help with stability in the bumps but kills on power steering in high-speed exits.
Low blocks refers to the inner hinge pin mounts theirs a low (.) ,mid (•), and a high (') . the higher u go the less the car will lean in the corners which in my opinion takes away traction .

grippgoat

iTrader: (8)

I tried 3x1.1 pistons on high grip carpet with a tight layout. The car was very responsive, but it was more prone to traction roll. I think it was because of the extra pack and overall increased damping. So it might be good for bumpy asphalt.

-Mike

Skiddins

If you can get away with 5 & 5.2mm ride height and not scrape the chassis, your track isn't very bumpy

Don't be afraid to try the higher ride height, just remember to adjust the droop to compensate.

Skiddins