[Mk2] [Turbo] Dynoed my Rev3 Tubby today, how far can I take it?

[rsevo6]

I have a very healthy low mileage (about 63K km/40K mls) '94 Rev3 Turbo with some very effective add-ons which I have been using mostly for trackdays over the last few years.

As it is so fast compared to other cars on the track, I finally dynoed it a few days ago and was amazed by the result.

The engine add-ons:
- Mines ECU
- Fujitsubo double catback system
- ARC intake box with pipercross panelfilter
- Dawes device to help build turboboost up a little faster
- Cusco intercooler piping

Still in place are the OE catalytic converter, the OE CT20 and the stock intercooler.
Results, running 1,17 bar (about 17 psi) max boost:
- 309 BHP
- 356 Nm
A/F is perfect at 0.82 at full boost (about 12:1 A/F)


I have done at least 2000 KM full blast on track with this setup, so it seems safe to say it is very durable in this way (knock on wood).
I have tested several other cars on this same dyno so I know it to be accurate.

I was very surprised to find my Turbo is so strong.

Now I start to wonder how much is safely possible with the upgrades I can still do in a simple cost effective manner:
- replace the stock intercooler with either a Phoenix Power IC I just bought, or a ARC IC that I also already have, but never installed
- replace the Cat converter with a Blitz DP that I already have, but never bothered to install as this would mean that every year for MOT testing I will have to replace it with the OE Cat

Any opinions on what these two bolt-on mods might still bring, how far will be possible with the OE CT20 and OE injectors/fuelrail??

[toxo]

Presumably the mines ECU has raised the boost limit for you? That's more or less all they do, maybe raise the rev limit and eliminate fuel cut.

With decent intake cooling you can run about 320bhp at 1.15bar relatively safely. You might want to tone that down to 1.1 or 1.0 for track reliability. After that you start to reach the limits of the stock fuelling setup and the CT series turbo.

If you've got a '94 you can take the cat out and leave it out for the MOT.

Edit: Sorry, just noticed you're not in the UK. I guess maybe your equivalent of the MOT might require you to put the cat back in every year after all.

[rsevo6]

AFAIK about the Mines ECU is, that it has maps to 22psi, has no speed or fuelcut and raises rpm's to about 7800

About the MOT: yep, here in Holland a '94 will need a Cat to be able to pass emissions testing

As far as relieability goes: as stated I have been running this setup for over 2000KM on track (possibly even 3000 already), even on 30C trackday once and no problems ever

Only thing I always do with 20C+ days is that for extra cooling I remove the panels left and right of the engine cover, this seems to work perfectly

[bobhatton]

Yes you should replace the intercooler and cat, it will make the engine run much better. Just to be safe I would fit a better fuel pump.
A/R of 12:1 is very good but most run around 10:1, very rich when on max boost so you may just be running out of fuel.

Bob

[Jim Galbally]

10:1 is NOT what you shold be looking at! that is FAR too rich

[bobhatton]

10:1 is NOT what you shold be looking at! that is FAR too rich

You are right far too rich but that is what most run at on a stock ECU

Bob

[rsevo6]

10:1 is NOT what you shold be looking at! that is FAR too rich

You are right far too rich but that is what most run at on a stock ECU

Bob

And that is exactly (well, at least part of) the reason why I changed the ECU, the OE ECU smothers the engine with fuel as a protection but costing quite some end-HP in the process.

I now have choice of 2 intercoolers that I have:
- a ARC (supposed to be the best in OE position whyle retaining the side airduct)
- a Phoenix Power IC which is supposed to be the mother of all side mount intercoolers, but probably capable of sustaining a lot more power than the CT20 can produce with my setup
decisions, decisions

[bobhatton]

Its got to be the Phoenix Power IC then.



Bob

[rsevo6]

Its got to be the Phoenix Power IC then.

Bob

Was thinking it might be overkill..

[bobhatton]

No not at all, need to get the charge temp as low as you can as you have less cooling from the fuel.

Bob

[Davezilla]

12:1 is spot on I'd say, I'd agree with new IC as a next step for more ponies

[Jim Galbally]

12:1 is the leaner side of what most professional mappers will set a car up at. it shoule be fine but just doesnt leave a massive safely margin

10:1 is not what the cars run stock, its bloody rich but its not THAT rich!