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Originally Posted by rx72c
(Post 12519251)
Your formula is wrong
The G45-1500 easily makes 1000RWHP on a 20B 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. 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) . |
Originally Posted by rx72c
(Post 12519252)
Mismatched wheels?
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. 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.
https://cimg5.ibsrv.net/gimg/www.rx7...000b0d08b.jpeg G42-1450 79|98 mm https://cimg6.ibsrv.net/gimg/www.rx7...6564288fc.jpeg G45-1500 76|109mm https://cimg7.ibsrv.net/gimg/www.rx7...15d8f658b.jpeg G45-1600 80|109mm https://cimg8.ibsrv.net/gimg/www.rx7...fa6047056.jpeg G47-1550 76|109mm https://cimg9.ibsrv.net/gimg/www.rx7...abab2a70c.jpeg G47-1650 80|109mm |
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 https://www.rx7club.com/20b-forum-95...-tune-1160114/ your personal assessment seems spot on, looking forward to it. . |
Alrighty then! Thank you so much TeamRX8! You have no idea how much you’ve helped me. Cheers! :worship:
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