Monday, March 19, 2007 - 09:59 pm, by: Cihan Aday(Cihan)
Benjamin Burgess wrote on Monday, March 19, 2007 - 02:17 pm:
I posted the graphs I made ages ago and was ridiculed by manny at the time.
Hah i know where you're coming from
I've always gone by 55rwkw as a static loss for the auto. Its not a constant percentage loss by any means.
Going by that and knowing your turbo compressor is rated at about 355kw - 300rwkw should be possible.
The older Engine Analyser didn't have a maximum flow rating input for the turbo mate, so max compressor flow wasn't defined. In the latest version (3.5) you can enter its rated max power and you'll find that efficiency plummets much faster like it does on the actual compressor map from garrett. It'll go over the rating by a margin with higher comp ratios, bigger cams, headwork, more timing etc though.
Benjamin Burgess Goo Roo NSW Toyota Soarer GT-TL, Toyota Corolla Conquest
I'm running the pro version but I know what you mean.
I found my graphs (made them nearly 3 years ago), was a little out. 455hp for stock cams at 24psi and 535hp for 264cams at 24psi. Don't have the 256cam one saved.
Stock cams, 24psi gt30r. This curve looks surprising similar to my dyno graph, even has the little bit at the end at around 6200rpm where it drops off.
264cams, 24psi
gt30r compressor map i used
It got this wrong but. Turbo comes on way to fast. The point were it starts to come on is actually correct, but the slope is wrong, and that's why it shows surging occurring which doesn't occur on a real setup cause it never hits 24psi by 3400rpm. With cams it could be around 3600rpm, with 20psi, so it could get close to surging.
I made this one for ••••• and giggles. 30psi, 272 cams and a gt35r turbo.
Benjamin Burgess Goo Roo NSW Toyota Soarer GT-TL, Toyota Corolla Conquest
That compressor map shows 25.75psi as about max on 78% efficency island. You'd need to then work out the rpm the engine flowed 40lbs of air to know what cams would best suit the turbo.
Did some quick calcs, works out to be about 4400rpm. Lower than I expected, turbo is too small for big cams, only get small gains
I have access to dynasim dymola and simulation engine 1D GT-power suite if anyone wants to get serious about engine sim. It's basically what toyota and nissan use. Need to really be a PHD to understand how to use it.
Cihan Aday Goo Roo Plug-in Emanage's - Now Available - Tuned to spec JZZ30
Tuesday, March 20, 2007 - 05:15 pm, by: Cihan Aday(Cihan)
I think you're using incorrect pressure ratio values mate, that would explain why they're coming on boost so fast. I've always used the lowest value in the highest efficiency island. For garrett turbos its usually below 1.75, off the graph you posted above the GT30 compressor trims about 1.55 and max flow is 52.5lb's.
Chris, you can try Engine Analyzer 3.5 PRO for 10 days absolutely free.
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