99mx5 EFR build
02-13-2015, 06:37 PM
#563
He may actually be limited by injector size. IIRC he and I are on the same 650cc injectors. Take that 375hp with a BSFC of .60 and .80 DC on 4 injectors and you are looking at required 743cc worth of fuel. The 60psi base pressure in the NB puts him at 763.39cc for actual injector size. So if you believe the RC calculator, its completely feasible that he did in fact run out of injector.
The numbers listed are optimal, obviously not taking into account plumbing losses and such. I'd have to dig through the thread and figure out if he went boost reference on the FPR or if he stuck with the stock system, because that will have a significant effect on things as well.
Either way, 375 is absolutely nothing to sneeze at
The numbers listed are optimal, obviously not taking into account plumbing losses and such. I'd have to dig through the thread and figure out if he went boost reference on the FPR or if he stuck with the stock system, because that will have a significant effect on things as well.
Either way, 375 is absolutely nothing to sneeze at
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02-13-2015, 06:44 PM
#565
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This was at 22-23PSI from glancing at the gauge. I will have to check the log to get the exact amount of boost. I have a Walbro 255HP fuel pump and FIC 650cc injectors.
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02-13-2015, 07:43 PM
#568
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Dear lord 
So what you are saying is... I don't need to worry about setting up a return and a referenced FPR? I'm running the same FIC 650 injectors and a 255LPH pump (DW200 in my case.) This will simplify my fuel system quite a bit.
Also, I know you said Magnaflow muffler and resonator, do you happen to have PNs around somewhere? That thing sounds amazing
So what you are saying is... I don't need to worry about setting up a return and a referenced FPR? I'm running the same FIC 650 injectors and a 255LPH pump (DW200 in my case.) This will simplify my fuel system quite a bit.
Also, I know you said Magnaflow muffler and resonator, do you happen to have PNs around somewhere? That thing sounds amazing
Last edited by EO2K; 02-13-2015 at 07:55 PM.
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02-13-2015, 07:48 PM
#569
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Damn son. I'm getting really excited to get mine on the dyno once everything is in place.
Anyone care to explain to me why power jumps so sharply at 4200 rpm? I'm guessing peak boost being held by the EBC?
What timing wheel do you have? Maybe timing jumping around also holding you back?
Anyone care to explain to me why power jumps so sharply at 4200 rpm? I'm guessing peak boost being held by the EBC?
What timing wheel do you have? Maybe timing jumping around also holding you back?
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02-13-2015, 09:13 PM
#571
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Damn son. I'm getting really excited to get mine on the dyno once everything is in place.
Anyone care to explain to me why power jumps so sharply at 4200 rpm? I'm guessing peak boost being held by the EBC?
What timing wheel do you have? Maybe timing jumping around also holding you back?
Anyone care to explain to me why power jumps so sharply at 4200 rpm? I'm guessing peak boost being held by the EBC?
What timing wheel do you have? Maybe timing jumping around also holding you back?
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02-15-2015, 03:31 AM
#572
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Here is the graph produced by the BW Matchbot based on the RPM and PSI converted from kPa to PSI from the log.
Edit: Corrected graph
Edit: Corrected graph
Last edited by 99mx5; 02-16-2015 at 02:40 AM.
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Also, did you hit the drop down to change the turbo and see where the plot landed on a 6758?
02-15-2015, 01:29 PM
#576
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I found that I could "stretch" the graph in megalog viewer to get more exact values. The RPM - kPa - PSI values from the log are as follows:
EDIT: THESE VALUES WERE INCORRECT. SEE POST #581 FOR UPDATED GRAPHS https://www.miataturbo.net/build-thr...0/#post1206424
Red is the incorrect value. Apologies for the error.
2000 - 50.1 - 7.26 -7.43
3000 - 110.5 - 16.02 1.33
4000 - 165 - 23.93 9.24
5000 - 221.5 - 32.12 17.43
6000 - 233.6 - 33.88 19.18
7000 - 220 - 31.90 17.21
EDIT: THESE VALUES WERE INCORRECT. SEE POST #581 FOR UPDATED GRAPHS https://www.miataturbo.net/build-thr...0/#post1206424
Red is the incorrect value. Apologies for the error.
2000 - 50.1 - 7.26 -7.43
3000 - 110.5 - 16.02 1.33
4000 - 165 - 23.93 9.24
5000 - 221.5 - 32.12 17.43
6000 - 233.6 - 33.88 19.18
7000 - 220 - 31.90 17.21
Last edited by 99mx5; 02-16-2015 at 02:49 AM. Reason: Incorrect values
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