And when did you do the 4X4 conversion?

Lol. Its just the systemt that he uses.

Ross

http://i19.photobucket.com/albums/b176/h2ypr/recentplottedgraph.jpg

Similiar to the one that flea created for me!!

Ross

Very nice Ross

Did they give you a torque print out too or just power ?

Just power. Worked out the torque and bhp from the fly.

They usually put boost and temperatures on it aswell ... but didnt

Ross

Thats a shame they didnt give you the torque plot, it would show how quickly the turbo was spooling up, you cant get an accurate torque measurement by just trying to work it out from a bhp plot

well you can work it out from the bhp at the wheels with a calculation.... 291 at the wheels and the peak torque is 265lb/ft.

Ross

There's no reason you can't as they are mathematically linked. The spoolup is a property of the dyno load applied to the wheels and because different dynos use different loads it is not possible to compare spoolup based on dyno printouts
V. nice result by the way - very flat torque curve means good power everywhere. Quite similar to the stock torque curve (except that drops off 7-800rpm earlier). Looks like you have a very well matched turbo.

The only query i have about the setup is why the power is dying at 6500rpm? Is something on my system restricting it top end? Is it the turbo for instance? Or something else i havent done/overlooked? Would my induction kit for instance be the wrong one?

Ross

Is it not just because you're tailing off the boost towards the redline?

Or does your boost controller not let you do that??

It's the turbo! You are running a pretty small compressor and turbine wheel (with a 0.64 housing) which means it will choke at higher rpms. The 28R is good for more midrange grunt and a wide spread of torque. If you want more top end then you will need to go bigger and trade a bit of bottom end.

Based on your 291bhp @ wheels, this gives you a 335bhp at the fly which is going some on a 28R!! Still not happy?!!

It doesnt allow me to do that... if it was up to the greddy, it would hold 1.4 bar to redline!

Ross

When looking as a comparison against suba and sheik then no. I technically have 1 advantage over them both. I have slightly more headwork. However sub has his unichip and some little tricks that hes going to unveil at the weekend supposedly!

Ross

Ok been looking at my last 2 graphs from ava. And its amazing the difference getting your fuelling and thermostat and intercooler sorted, can make Lol.

Previously at 2500rpm i was making around 210 lb/ft torque.
On my newest graph thats sitting at 232 lb/ft roughly. So thats 20 lb/ft increase low down.

5500rpm is 303 lb/ft on the new one.
5500rpm is nearer 297 lb/ft on the old one.

Torque at 7000rpm seems similar maybe a few extra on the new one but generally everything seems to be up.

Ross

you should still be able to make power at the top end with a GT28R. Mine starts to tail off at 7,000 but is still building rather than tailing off. You wont have increasing power at the top like the bigger turbo cars though. If your power is dying at 6,500 then it suggests you have a restriction somewhere IMO, I doubt it's the induction kit.

Best example was a little blat I had with Flea on the way to santa pod (when his car was on gt28rs - 370bhp??) and also at the pod itself. The cars were very even until 5,500 - 6,000 rpm where the bigger turbo started pulling lenghts very noticeably.

So what have you got that might be different then dude?

Ross

my complete spec is in hall of fame section - have a look and see. Could be as simple as intercooler piping route + smoothness etc. or the exhaust itself. I believe we also run different IC's

What intercooler you running?

I doubt its the piping route, because that would affect spool up which seems to be in my favour at the moment.

Ross

This is going to be interesting for the 28R boys

This information you mean?

ross

Ok all pretty much have the same spec i.e. GT28R, headwork, etc.

Torque - Suba vs Sheikhs vs h2ypr

Obviously different rolling roads etc but there is something strange going on with your car Ross Have you sneaked in a Garrett VNT turbo?

Whats a VNT turbo?

Ross

Just bring this to the front again. After getting my fuelling issues *kinda* resolved, do you guys think its worth going for a RR to check it out again?

Ross

edited to say : im running less boost at redline, as i believe, after taking advice from others, that heat is reducing my top end torque and bhp.

It means Variable Nozzle Turbine. Basically, it a turbo which changes the angle of the turbine blades depending on its speed. The benefits are reduced lag and optimal torque and power throughout the rev range. They've been in use on diesel truck engines for years. The new 997 Turbo uses VNT units and AFAIK, its the only mass production petrol engine to use them so far.

So does h2ypr have a VNT turbo, is he telling porkies or is it down to a one off magical head by Barbz?

Its the head.

Ross

I run an ANEW Digital 008C intercooler - Evo replica off ebay.

I was checking my intercooler run against mattb's today and mines seems shorter.... so maybe that is a contributing factor.

Ross

I know that Sheiks ran high boost midrange - which might explain his higher torque figure.

I'm not sure if all three cars are still running standard cams?

Im on stnd. You are aswell arent you?

Ross