AndrewC

Do you want dyno figures or a wider power band?

Changing to a cone filter and heat wrapping everything is not going to stop what I perceive to be your fundemental problem of lack of VE a higher revs.

I know there are cars out there there that have made 380/380 with a EJ257, 20G and late model OEM TMIC, how many of them used std UK heads?

Also what headers have you got? Some of the small bore equal(ish) length ones work great on a 2.0 with a TD04 at 300bhp but don't perform as well as the HKS/GruppeS/GT-Spec style headers when you get closer to 400bhp.

Andrew...

Scott.T

iTrader: (2)

But the wrapping and a heatshield on the 20G, has got to help after seeing such a rapid drop on the rollers.
Also a 20G on song just below the STi 8 intercooler, with no heatshield isn't going to be doing any favours.

It's probably warming the intercooler quite well at 5,500rpm

Gruppe-S headers then Rob.....let me know what you want for your old ones

AndrewC

Yes it will help, but far more on the rollers than on the road (assuming it is a road car and not a track/drag car).

Andrew...

RobEvo5

iTrader: (9)

Wana just buy the complete car.! Starting to loose heart in it as its starting to become a money pit I can't help myself but keep spending on it rather than just enjoy it. Currently feel like selling and getting a M3 or TVR Tamora.

RobEvo5

iTrader: (9)

Road Car and my daily driver - Have spare set of alloys in readiness for a track day or 2 but can't bring myself to giving the car all that grief for and hour or 2.

Scott.T

iTrader: (2)

I'll think you'll find that's because you want it all 'yesterday'.
Most of the people that have replied to this thread have been gradually building their own modifications up over a number of years 'NOT' weeks.

Take a leaf out of your brothers book. He's spent alot on the Porsche, but he has had it 10 years and spread the cost over that time.

You won't be happy until you've had another BMW (for a month, max). Then you'll be itching to modify something again. It's a drug...accept it.

john banks

For me, it isn't the itch to modify, simply to get good performance. I'd rather take an M3 than a Subaru with similar power like the dyno graphs show, but the tables would turn if the Subaru had 400 BHP and 400 lbft, and DCCD with good suspension. Just my 2p.

RobEvo5

iTrader: (9)

When I throw myself into a project, I do it in spades, I am the same whether its at home, at work or on the car. Live for today!

Whilst I have been playing with the car the last few months, I have also moved home, fitted a complete bathroom, decorated 50% of my house, kitchen coming in 3 weeks, along with a new baby girl in about 4 weeks.

Oh and work is full on at the moment as well - Works wonders for my blood pressure.

Really must back off the Scoob for a while.

Would be interested to see some plots and figures from snetters running 2.5's with UK heads though. As stated above all the big numbers I have seen are from STI hybrids not UK hybrids.

Neilo

give me a month or so and hopeuflly ill be able to do just that....so we will have a basis for comparison Rob.

RobEvo5

iTrader: (9)

The M3 is very underated. Having been in a M3 all the way back from south of france driven within an inch of its life. They have immense torque, reliablity, revs really high, stops on a penny, handles like a 4 wheels drive, and puts the power down like no other RWD I have even been in. And will do it all day long. They can be chipped to 360+bhp. My mates just done it, and took it to airfield and topped out at 180mph. Will dig out footage - sounds glorious.

Too many people have brought M3's that don't know there potential IMHO. Reved beyond 6K they have a second lease of life, and if you are brave enough they will out handle a standard scoob and will certainly out break one.

Neilo keep us posted, a couple other 2.5's out there are running similar power to mine, I think Fulhams is less torque, and KevWRX95 is running slightly less than me, both I believe are running WRX or UK heads.

john banks

They stop very well a few times, but after that the brakes judder on mine, really needs APs or at least a different pad material for hard use. They are also not so good at high speed on bumpy roads, but on smooth high speed stuff have huge grip. The torque is by no means immense though and you really need to wind it out to the limiter.

A properly setup classic with 2.5/20G will obliterate an M3 in any acceleration measure.

Andy.F

We have Alan Bells 2.5 JDM Sti7 running 420bhp/400lbft (at scoobyclinic) With full boost from 3000 rpm and an rpm limit of 7800rpm it is an excellent fast road tool
This has a 'built' bottom end so should be safe for many miles at this level. It's how they should have come from the factory

Andy

The Fixer

Rob, I'd agree with the previous statements in that your engine is becoming strangled on the intake side and the VE is decaying the further you rev it. I think if you sort the induction side of things you should see a good improvement.

john banks

Andy, is Alan using a SZ49 or similar? What sort of boost level, and is there any more power on the table using Optimax do you think?

P20SPD

iTrader: (1)

My own 2.5 was failry pants on UK heads, but once i had the heads ported and sti 5 cams in, it was a different engine.

That short block is now sat firmly between the sti7 heads on Alan Bell's engine, and i have to say, it is was stunning to drive before its most recent remap. Absolutely bucket loads of torque, without any feeling of lag at all.

John, iirc its based around a full TD06 with a 49lb wheel.

T-uk

I would rather have your M3 too.... then I could sell it , buy a MY06 UK STI , fit a fuel pump , decat , 20g with remap and still have enough left to pay for our new bathroom

RobEvo5

iTrader: (9)

Not ideal, and sucking in warm hot air, but the second hand K&N induction I have coming is worth a try it will cost me vertually nothing to give it a go, and if I speak nicely to Simon I am sure he will plug in his wideband if I don't buy one before to check the fueling is still within acceptable limits.

I can't stretch to the heads for a while, so hoping the the simple addition of an induction kit will help it breath a little more at the top. The K&N should arrive tomorrow, and will bolt it up over the weekend. And report back on this thread.

The Fixer

Rob, I wouldnt bother with the warm air sucking type induction kit, get an APS CAI kit that sits in the inner wing. If you cant avoid using the K&N type try and use some form of panel to isolate it from the warm underbonnet air and run a cold air feed from the front bumper to the makeshift box.

Conrad

alanbell

iTrader: (6)

422 bhp and the Type 25 full suspension kit

Neilo

so are we saying that the UK heads are limiting power and torque? or just power? as the torque figure still seems pretty healthy especially given the standard airbox? If i have that level of torque from mine then i will be quite happy i think....

RobEvo5

iTrader: (9)

I am happy with with torque figure and still very happy with the drive of the car. From whats been said I think the intake and heads is limiting largely the power more than torque. Torque x revs x somefactor!? = Power. I don't have the revs so the top end power is down.

If your not punishing the car car and look for the next gear at around 5.5K, and let the torque do its job, the car pulls like a steam train. But on the few occassions when you want to hold onto a gear I wished I had some more at the top. On an 'A' road which is what these cars are all about, its a devasting tool. In the same token on a motorway at 80mph in 5th, its at about 3K rpm. Nail it in 5th and it pulls and pulls.

Neilo

Thanks rob thats interesting to know....I have a few different components to you such as cold air induction and a large bore exhaust so it will be interesting to see how it compares.....you have the larger turbo though as far as im aware.

It will be interesting....

RobEvo5

iTrader: (9)

After blowing the UK gearbox, and now having a stonger box in place. I thought I would add to this thread, that I now have a K&N inudction kit (warm air). WOW!!!! what a difference.

The car is now dramatically quicker. The change can only be described as from when I went from a vf23 at 1bar. To a 20g at 1.3bar. The leap seems to be the same again.

The airfilter would appear to have been the missing link. Its now scary to drive, and worries the hell out of me everytime I nail it in fear that something else is going to break.

I have probably gained a double whammy, of leaning the fuel a little which I think I could afford to do, and helping it breath a lot more.

The car is being checked out later this week to make sure all is well. But knock count is low at only 11 so looking good at the moment.

RobEvo5

iTrader: (9)

Will work on cooling and insulating another day. I need to lag uppipe/downpipe, headers, put turbo heatshild back, and create a box for the K&N. Going to leave this as a summer project.