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we also made 800RWHP on less than 2 bar of boost on a G45 on a 13B and that was through a torque convertor.
I have real world results, you guys giving advice based of what you might "think" should really go back to the drawing board. Some horrible advice in here.
what formula are you using then, because the well accepted and proven one indicates 133 lbs/min flow for 1000 rotary whp. 800 whp equates to 106 lbs/min which at 2 bar is at least on the indicated map. Not saying you can’t get there, but the difference is that it has to be way out on the far right off the rated efficiency of the compressor map to do so.
There are real world videos of the G42-1450 on a 20B exceeding 1000 whp on the dyno, running a 1/2 mile and then also running an 1/8th drag strip. It’s clearly no slouch and operating up in the 70%+ efficiency range doing it. Hard to understand how that’s horrible advice compared to operating well out past the last indicated 60% efficiency line on a turbo that was clearly intended for 3.5 - 5 Bar performance. If you say that you did it then I can accept so on your word alone, but it doesn’t make the turbo either a good or optimum choice.
Unlike yourself I won’t claim it’s a horrible choice, but there are well established reasons not to push a turbo out there. I’ve seen other people push a turbo out there before. Obviously you’re doing/did it too, but then there clearly are real world results of the G42 as well regardless of what you think about the person who did it. So again, just struggling to connect the dots on how that’s horrible and yours is isn’t.
If this is horrible then I’m obviously out of touch with reality (skip to 5:30 mark)
G45 spools faster than a G42 and has 1:1 emap at 2.5 bar boost compared to 2:1 emap on a G42
all on a 13B
All the testing I did was BACK TO BACK on the same car with in the same week.
I take some back, the G45 with 102mm exducer compressor is decent. The G42 with 91mm exducer comp is good. G42 with 98mm exducer comp is meh. G45 with 109mm exducer comp is bad.
The hot ticket would be the G45 turbine with the 98mm exducer "1450"hp wheel of the G42. Garrett really needs a G50 turbine to go with the 109mm exducer compressor wheels.
Good news! Garrett HAS released additional G45 turbos as well as the G47 and G50 lines. Bad news is it seems the G42-1450 is still best for my application. Keep in mind ideal is 115-130lb/min of air at 2.5-3 Bar.
posted this up a while back for a billet 20B street application with the newer G45
BHP on an engine dyno though so less where the rubber meets the road. They were aiming for response rather than top end power though and it was a bit rich pending final install. They didn’t specify, but likely the -1500
05-23-22, 01:38 PM
