So what part of your mods are giving you basically twice the amount of torque right from low rpms too high rpms? Down at 2400 your boost cant be making too much of a differance. Maybe your larger exhaust and better flowing head? Curious as to what you think.
Likely from the following:
* Larger exhaust
* Better flowing head (big mound of aluminum shavings after 935racer finished the headwork)
* Better flowing PD130 intake (also port-matched to head)
* Better flowing exhaust manifold
* The GT20 turbo does spool QUICK
* Both turbine housing and exhaust manifold were cermachromed
* Higher camplate lift in fuel inj. pump
* New injectors
* Retained short intercooler plumbing (no FMIC)
* Maximum 1.6 piston OEM overbore size
* Lightened flywheel
I think that's most of it.
I did a little research on the
deck mod that 935racer did to my head. I found a site that is dedicated to notching the deck of the head where the edges of the cylinder meets. For all types of cars. Notching is just that, imagine sticking a knife straight into a butter, that's what the narrow notch looks like. It's not exactly the same style as mine, but people have reported that it broadens the torque curve; more torque down low and more torque up top. That was a while ago and I don't have the URL now, but I'll search for it.
I can't say 100% if 935racer's deck mod actually worked in my case as all the modifications were put together at once, but I'd do the deck mod again as it also lowers compression, which is what I need for mucho boost. Better than pushing the whole cylinder head further from the cylinders via a thick flimsy headgasket.
I believe the Giles pump also played a big part in that low RPM torque. I am currently running a NA pump and I did a Gtech a while ago, it reported HP in the 50's. This is with the same calibration and on the same stretch of road. I forgot what the torque was, but 50HP!! :roll: I had turned up the fuel screw a little bit and it is still very driveable on streets & highway.. no grey/black smoke whatsoever and no problem accelerating to ~140km/h either. I could probably go faster but haven't bothered. Max boost is a slow 16 PSI due to limited NA fuel.
I will be sending my Giles pump (currently sitting on a shelf) + upgraded plunger parts back to him soon for an upgrade. I'm really looking forward to being able to rev past ~5,100 RPM (along with intercooling, 935racer's race cam), and I definitely need the extra fuel as I was smoke-free above 25 PSI or so (with LDA and fuel screw fully turned up in Giles' original pump).