Ok your personal views experiences would be good.

Anybody who has fitted a Gt28rsr/or gone for the bigger turbos` your views would be ideal,would you go for your choice again or change......Nigel,Flea etc etc

Just to cover all angles, I was thinking about going 2.4,I have the price for the stroker kit, but no idea as the cost to what else I need..e mailed Barbz but still waiting on a reply

My Gt28r started to smoke so i sent it away to Turbo Dynamics and got myself a nice new GT28RSR but I now want to fit forged rods(something I should have done a the rebuild but never...plonker)so this now gives me the chance to fully exploit all the mods I have by not being restricted by the OE rods

So now....

I`m not sure,if I should fit my new GT28rsr,get it mapped and see what I get with the current mods I already have.

or go for a bigger turbo and therefor more power..... but more of the dreaded lag

I`m not going to use the coupe on the track, just want a fast driveable road car (not used as my daily driver any more tho`)

current mods as far as I can remember ..

C+B cams
stage 3 (so I`m told ) headwork
Aquamist
Forged pistons
shot peened/balanced rods..changing for forged
lightened flywheel
all balanced
chargecooler(for sale soon tho`)
blueflame Exhaust (soon with 5 stud downpipe)
fully ported opened up manifold
Apexi boost control
FMIC
SIP
GTech2 or Squadra chip ...can`t remember
uprated fuel pump with wiring mod

I reckon I will need bigger injectors, but will decide when I decide on which turbo..

will add if anything missed,if and when my brain works

just incase anyone mentions it,brakes,suspension and lights already uprated

Im only speaking from my own experience, but i think you shoudl stick with the rsr and get 370bhp as markus did.

Ross

thanks h2yper it`s personal expreience that counts it`s great to say my coupe has over 400 bhp but it`s how it drives that really matters ,BUT ........................................




having over 400bhp sounds good to

Its the reliability tho aswell. You've had nearly no problems with your other setup.

Ross

p.s. you have pm.

RSR Paul, you know it makes sense.

Yup I have been spoiled,I have had no problems at all with my set up

that s 2 votes rsr

Hmmm, I was going to suggest GT3076 and let me dispose of that useless RSR for you.

RSR. In Nigels other thread he said he felt he went too far with the turbo, and I'd be wary of sticking a massive turbo on if you're concerned about lag.

I'd go 0.86 Disco Potato.

I think with extensive headwork and ported manifold you won't suffer from too much lag. If you're using standard injectors I would also throw in a bigger FPR to help get more fuel in there.

Also with a balanced bottom end you could run a higher rev limit hence keeping the same powerband.

you need to drive a couple of cars - one like mine with some lag but a mad top end and one with loads of low down pull, but less urgent towards the redline

There are times when my car annoys me, booting it at 2,000rpm and waiting for a long weekend for the boost to arrive.

Other times its just sooooooo much fun, like sitting in the outside lane of the motorway, waiting for the muppet in the BMW 325/330 etc to pull out of the way, then howling past like it was standing still, or like tonight, coming up behind a Bentley Continental GT - he floored it, expecting to lose me - he didn't (in fact I had to brake to stop myself leaving a Plus grille effect on his precious Bentley ar$e)

would be ideal,buy can`t happen `up here` so will just have to think long and hard,my brain says, rsr `you know it makes sense`....but then,I think I could have around 450 bhp to play with and i think sh*t need to decide,as i want it back on the road now

Paul I thought you often came up to Aberdeen? If so you're more than welcome to drive my old rust bucket, see how you like the RSR.

i think you are in exactly the same predicament as me! i really don't know whether to just stay with what i've got and maybe some headwork, or go the whole hog.

i'm swaying towards staying just below 400bhp and having a much more driveable car and it seems to be a lot less hassle. i don't know if the hassle is worth it!

Mark

Matty, thanks for the offer,yes I used to be up a lot, a good friend of mine owns a few clubs pubs up their,but due to me buying a new business,Ive not been able to get up in ages ,hopefully, I`ll rectify that soon, if so i`ll be in touch
Mark ,one of the main things that is pushing me, is I am going to fit forged rods ,which will give me the capability to really push the engine,and I feel maybe I should take the opportunity to do that.....but well hmmm
tbh I am kinda swaying towards the rsr,with my spec it should give around 360-380 still be a plenty fast coupe,but 430 or so sounds damn good too,but will it be a pain too often, as Nigel mentions........until you get a piece of road to use it .......then ...it`s make your mind up time

You could leave it as is, and add 4x4 from a dedra integrale or 155 Q4. You get to put all the power down, great traction and handling - the best mod you can ever make to a coupe. Very very nice indeed.

Jowster,looked at that years ago with Barry at EVO Engineering (when Barbz was still with him)not as easy as it first sounds ,but would be great fun, if done,especially with 450 bhp

Paul, if you can make it to Crail on the 11th Fergie will be there with his which is powerful but a bit more laggy and Matty should be there too so you can see what the RSR is like.

How much difference is there really tho? between 360 n 400? Its not gonna be noticeable on the road really.

Ross

Paul. Already done this using dedra integrale - but not on a 20VT:-( That's the project for next summer. Traction was the best.

Back to the turbo, GT28R more than enough....as the advert use to state "power is nothing without control"

It is a little bit like diminishing returns - but I bet you can remember the difference between your std car and it with a GTEC or something like that, and that is the difference in power.

+1

I'm currently driving with 1.0-1-1 bar boost (waiting to fit 500cc injectors and reprogramming the thing) and that is 300bhp. I can tell you I can feel the difference to last weeks 330bhp

V.

I'm going forged aswell Paul

Going forged seems to make you feel that if you don't push the engine further you are wasting the money that you have spent

Yeah but i think thats got something to do with the way the power was delivered after the gtech. Going from a 360 beast which would be full on power, to 400 which is still full on power..... Dont know if there would be.

Ross

I would say go for more power. As long as spoolup wont be much later than 4000rpm.
I really dont understand having a lot of torque at 3000 rpm on the coupe. If you need the torque, just shift down.
If you want to go fast and get good acceleration you need the torque higher up.
If you want to cruise around town and listen to music with a big spoiler back. (And maybe a few of those cool stickers and neon lights) Then get the torque low-to-mid range.

Lol. Good to see you dont have any strong opinions

Maybe some people like usable power. Maybe people dont use the coupe as a toy, as it tends to not respond to a ragging on a constant basis.

Ross

am I on the correct forum !!

Why is power non-usable just because you use it on a lower gear ?
I dont see running 50mph in 2nd gear as a problem. (When I need it)
Having torque low end is what I would like to say non-usable power. Because its outside of the coupes rev range. (Wich is between ~4500-~7000) So basically you just throw the power away.
But sure, if you dont like shifting - why not.

Man you talk rubbish. The stnd coupes power range is between 3000-6000rpm. The stnd car is very driveable. What you intend to have is spool up worse than Nigel and Flea, who would both agree that as a road car, the power should come in earlier.

Paul does a lot of motorway miles, as do i, and changing down into 4th at 80mph, just isnt an option really. Would prefer to squeeze the throttle and the power come in.

What torque would be good for good acceleration in your opinion?

Ross

There is nothing rubbish about what i'm saying.
If you dont believe me. Go out and test your car. Go into 2nd gear and give full throttle to 6500rpm. Then shift to third and tell me what rpm you have then. It wont be 3000 rpm, no it will be above 4000rpm.
And then go even higher! 3rd gear to 6500 rpm and then shift! Where will you be now? even higher.
If you want to have torque at 3000 rpm and shift at 5000-5500 rpm then sure do it. But you will loose a lot of top speed.

Or why not let us do the math!?
Gear ratios of the 20VT.
1st: 3.800
2nd: 2.235
3rd: 1.520
4th: 1.156
5th: 0.914

1st gear at 6500 rpm switch to second -> (2.235/3.800)*6500 = 3823 rpm.
2nd gear at 6500rpm switch to third -> (1.520/2.235)*6500 = 4420 rpm
3rd gear at 6500rpm switch to fourth -> (1.156/1.520)*6500 = 4943 rpm.
4th gear at 6500rpm switch to fifth -> (0.914/1.156)*6500 = 5139 rpm

Wow what have ve learned? That even from 1st to 2nd gear you will be closer to 4000rpm than to 3000rpm.
and as we go faster our "low-end" torque just becomes more and more useless.



As I already told you. a Torque band between 4000 and 7000.