Just want to pick peoples brains to find out at what rev's
do there gt28rs come on boost

I can probely guess it depends on how the EBC is set up

I have mine set up to run just under 1.4 midrange and i
can get on to boost by 3k and 3100k the torque comes in
and then all hell breaks loose

Ben

Once you get a graph you'll see your torque going northward at 3100rpm but you probably wont be on boost (i.e. 280lb/ft + ) until 3500/3700rpm.

Ross

ross is spot on

Kev

Im asking as when at 3k i feel the increse in torque and in
2nd regardless if its dry the wheels break traction,

until
third where again at 3k instead of the wheels spining the car torque steers slighty, but it grips

could this be solved by a slower and less agressive spool up

Ben

i would say it does pull at just after 3500rpm, but really gets going at 5000rpm all the way to the limiter

i run a apexi boost controller which lets to adjust the boost levels in each gear.
not sure if it lets you change the duty in each gear though which would probably give you a less agressive spool up.
iam sure someone will know

Kev

I'll have an adjust of the controller tomorrow to see
if i can get a slighty less agressive spool up

Ben

What boost control u using?

Ross

Greedy

Ben

Set your start gain lower i believe.

Ross

The problem with that Ross is that the boost response is crap - e.g. 4,000 rpm in 4th, lift off then nail it again and it takes an age to spin up and get to full boost. i reckon that you are better off using your right foot to adjust the boost, or get a controller that allows you to run less boost in the lower gears.

Good point suba, never thought of that.

Ross

You shouldn't break traction in the dry, probably more a problem with your tyre or suspension setup.

i was thinking the same, i don't break traction in 2nd in the dry!

Bloody good point John. Tracking, wishbones, tyres etc. are major factor in how a coop gets the power down, and how much torque steer you get!

Had a go this morning and its sorted

Lowered the set-gain down and adusted the set up a bit and
it now pulls very strong and straight in third

as for the traction in 2nd, i can now get the power down,
though all the testing over the last few days were when the roads were very damp

Ben

I cant control mines in 2nd when im running full boost.

Ross

Unless the road is dry i still get a tiny bit of slip

Though lowering the set-gain a little on the controller
its still spooling up nice and quick

Ben

I agree with JohnS - I'm not sure I could break traction in the dry in 2nd gear even if I tried. Even in the wet, it needs to be a pretty slick surface to cause me problems.

However, as has already been said, the reason that a 300bhp Coupe can have more traction issues than a 400-500bhp Coupe is the way that the torque arrives, rather than the actual amount of it.

A larger turbo will always spool slower and by definition, the change is less sudden. A small turbo will kick hard and go from not much to quite a lot of torque across a very short rev band.

The only realistic way to reduce the kick is to reduce the spoolup speed of the turbo, which is usually best achieved by reducing the gain setting.

Note that this will also help with clutch life too - torque is as bad for clutches as it is for tyres.

If you're getting torque-steer, something is wrong with your setup. I've never had it on a Coupe, ranging from bog-standard to madly-modded and everywhere inbetween

That is a option of lowering the set-gain but i still would
like a quickest spool up,

The tracking on the car is fine and all relative suspension
components are less than a year old, the only suspect
areas are the front tyres are a tiny bit low,

i could swap the fronts with the rears

Ben

keep the tyres with most tread on the back

I'll swap them and if its solves the traction issues,

i'll get a new pair

Ben

Lol.

Ross

Think i can put up with it

Ben

SOLVED

I found out it had nothing to do with the set-gain


The problem was found in the car

It was just under 6ft and weighed just over 12stone,

Yes it was Me

Basically while i was in work yesterday i was thinking about it and realised,
when i have been testing it i hav'nt heard any wheelspin or judder through the steering wheel
as you would expect when you loose traction

And the main thing was yesterday,
when i thought i broke traction i changed to 3rd and looked at the speedo inmediatly
and i was doing just over 60mph

So it was'nt breaking traction,

Maybe i was'nt expecting the revs to rise as quickly as they
did,and idid'nt think to look at the speed

In my defence i have been poodeling along on base boost since last november

Ben