GReddy @ 15psi - Miata Turbo Forum - Boost cars, acquire cats.

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Old 09-26-2006, 03:36 PM   #1
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Default GReddy @ 15psi

Finally got the run files. Before the turbo and at 15psi. Enjoy!
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Old 09-26-2006, 04:06 PM   #2
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I must say, I'm very impressed every time I read about your dyno run. Great job! You may have the fastest Greddy miata period.
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Old 09-26-2006, 04:49 PM   #3
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Those are impressive numbers considering you aren't using a more capable ECU. You dyno plot goes against the common opinion that you can't get these kinds of power levels with an AFPR based system!

There is a dyno plot at FM's webpage of a greddy setup w/link doing over 260. In the description it says "It takes a little while for that turbo to spool..." Ironically it seems to get to peak tq as fast or faster than their 1.6 FM based setups.

Good job!

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Old 09-26-2006, 06:56 PM   #4
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I dont get it..how is it possible to run those figures with emanage and 1.8 injectors.

Am I missing somthing here????
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Old 09-26-2006, 07:02 PM   #5
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Lots of fuel pressure! And voodoo, don't forget the voodoo.
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Old 09-26-2006, 08:42 PM   #6
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I dont get it..how is it possible to run those figures with emanage and 1.8 injectors.

Am I missing somthing here????
It's more than just 1.8 injectors and emanage. I also have a Begi AFPR and Pierburg inline fuel pump as well as an RX-7 AFM and olderguy's autotune. While I agree that "technically" the 1.8 injectors shouldn't be able to support those #, well...they do, and both the tailpipe sniffer and my pre-cat WB show that I am not running lean.

As I've posted in the past, many of the miata gurus (Keith from FM, Brant from BRP, markp, RodH) have said that the 99-00 1.8 injectors have lots of "headroom" for FI whatever that means. Maybe b/c they were designed around a returnless fuel rail that runs at 60psi they are more tolerant of higher pressures. Not sure.

Granted, they "technically" shouldn't work, but they do. That said, I have a spare set of 310cc injectors in my garage should my WB or other data ever show that I am running lean or too high fuel pressures. FWIW, olderguy also runs 1.8 injectors at 15psi and has not had fueling issues either.

Oh yeah, and I forgot....the special boost voodoo dance before I get on the dyno....haha
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Old 09-27-2006, 02:09 AM   #7
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makes me wonder what a peiburg can do for me.
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Old 09-27-2006, 10:58 AM   #8
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makes me wonder what a peiburg can do for me.
I love that damn fuel pump, LOVE IT!
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Old 09-27-2006, 10:59 AM   #9
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Quote:
Originally Posted by brgracer View Post
It's more than just 1.8 injectors and emanage. I also have a Begi AFPR and Pierburg inline fuel pump as well as an RX-7 AFM and olderguy's autotune. While I agree that "technically" the 1.8 injectors shouldn't be able to support those #, well...they do, and both the tailpipe sniffer and my pre-cat WB show that I am not running lean.

As I've posted in the past, many of the miata gurus (Keith from FM, Brant from BRP, markp, RodH) have said that the 99-00 1.8 injectors have lots of "headroom" for FI whatever that means. Maybe b/c they were designed around a returnless fuel rail that runs at 60psi they are more tolerant of higher pressures. Not sure.

Granted, they "technically" shouldn't work, but they do. That said, I have a spare set of 310cc injectors in my garage should my WB or other data ever show that I am running lean or too high fuel pressures. FWIW, olderguy also runs 1.8 injectors at 15psi and has not had fueling issues either.

Oh yeah, and I forgot....the special boost voodoo dance before I get on the dyno....haha

What kinda fuel pressure are you seeing at 15psi? I used to run about 110psi or so on 270's ( I know I was rich like Bill Gates )....just wondering
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Old 09-27-2006, 11:04 AM   #10
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I think he said he was around 100psi or so.
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Old 09-27-2006, 11:05 AM   #11
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Quote:
Originally Posted by AndyFloyd View Post
What kinda fuel pressure are you seeing at 15psi? I used to run about 110psi or so on 270's ( I know I was rich like Bill Gates )....just wondering
Right around 90-100psi last I checked.
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Old 09-27-2006, 11:15 AM   #12
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Oh yeah, and I forgot....the special boost voodoo dance before I get on the dyno....haha
I wondered what you were doing! I thought you had to pee.
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Old 09-27-2006, 11:20 AM   #13
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Right around 90-100psi last I checked.
wow, I need to lay off my fuel then. LOL. I think Im gonna run out to the car and put a restrictor in my AFPR.
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Old 09-27-2006, 11:26 AM   #14
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I'm feeding my 305s 100psi of fuel at 9psi of boost. I'm recording 12:1 and slowly getting richer nearing redline.

330s at 100psi are good for about 275 BHP
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Old 09-27-2006, 12:12 PM   #15
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I'm feeding my 305s 100psi of fuel at 9psi of boost. I'm recording 12:1 and slowly getting richer nearing redline.

330s at 100psi are good for about 275 BHP
Yeah, see I run about 110psi for 12psi on pumpgas. Its around 10.5:1 AFR's. I would prefer to be around 11.5 :1 but I run rich just to keep things safe. I was gonna add a resitrictor and try to get around 95-100psi and lean it out just a little to gain some free HP. Anyone use the wd-40 restrictor mod?
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Old 09-27-2006, 02:07 PM   #16
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POP and a few others suggested it to me. But Corky was nice enough to send me one of his.
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Old 09-28-2006, 09:35 AM   #17
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What injector duty cycles are you guys running?
I only had fuel for 13psi with 440's at a static 80 psi.
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Old 09-28-2006, 09:54 AM   #18
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The highest that was logged by the Emanage was 91 just at the end of the run, but there was no additional injection at that time. The highest I can read in fuel pressure that logs is 97psi(so it could have gone over 100), but that only held for about 1/10th of a second.

I don't fully trust the Emanage logging 'cause it is only picking off in 1/10 seconds. The control factor is happening much more quickly.
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Old 09-28-2006, 01:53 PM   #19
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My highest logged duty cycle was 92-93 very briefly as well toward the end. No additional injection at that point as well.

Also agree with the emanage logging as some numbers do not correlate with the LC-1 numbers that logs much faster.
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Old 09-30-2006, 01:31 PM   #20
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You guys have to remember at those high pressures that the internal injector "needle" has to close against those pressures in 1 complete duty cycle. So even though your around a 85-90% duty cycle, the injector may still lag due to the increased pressure it sees when the needle is open. I can't see this being good for injectors over the long run.
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