Greddy kit running 16.5 psi and making 177whp? - Miata Turbo Forum - Boost cars, acquire cats.

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Old 04-15-2013, 11:40 AM   #1
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Default Greddy kit running 16.5 psi and making 177whp?

I've looked at a few posts on here stating that the greddy kit running 15 - 16 psi should get to close to 200whp.

I dyno'd my car on friday, it's tuned nicely, decent AFR's and a nice flat afr range, but the car struggled to make any more than 177HP at the rear wheels, I had a different head on the engine previously and the car was around 200WHP, wondering what could be the cause for losing 20bhp?

The car has a fully mapable standalone emerald ECU with 440cc injectors, dual feed fuel rail, decent fuel pump etc.

I'm thinking I should check the cam timing as it maybe a tooth out?
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Old 04-15-2013, 11:51 AM   #2
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what type of dyno.

at 16psi, holding to redline, on a good tune, id expect closer to >240rwhp.
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Old 04-15-2013, 11:52 AM   #3
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Something has to be seriously amiss.

At 14 psi I did 247 (dynapack, no correction) and we pulled a bit of timing for a final of 240/217 at the hubs.

Pics of setup?
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Old 04-15-2013, 11:56 AM   #4
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What's your exhaust system like? Plugged cat?
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Old 04-15-2013, 12:10 PM   #5
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Ive never been in an greddy with the original greddy turbo that felt anything like 247 hp.

Dann
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Old 04-15-2013, 01:15 PM   #6
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Its on a dyno dynamics based in the uk, I know they can be a little conservative though.
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Old 04-15-2013, 01:30 PM   #7
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What are the dip switch settings on your Bipes?
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Old 04-15-2013, 01:38 PM   #8
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No bipes, it's running standalone ecu that controls ignition and injection.
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Old 04-15-2013, 02:22 PM   #9
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did you log the dyno run?

what type of dyno?

what size exhaust?
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Old 04-15-2013, 02:43 PM   #10
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how about you share all the info so that 100 initial posts aren't asking you for specifics?

dyno dynamics can read very similar, and in some cases even lower than a mustang dyno.
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Old 04-15-2013, 04:12 PM   #11
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Quote:
Originally Posted by Paul TVR View Post
No bipes, it's running standalone ecu that controls ignition and injection.
Oh well there ya go. Greddy kit only works well with Bipes, Starion IC (with Jim bobowski/15psi.com's intercooler pipe kit), Saab throttle body elbow, and a Bailey BOV from Roadster Performance. B.Bowser heat shield keeps the intake temps down! Racing Mazda's downpipe would be a good idea.
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Old 04-15-2013, 04:19 PM   #12
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Darn, I've been doing it all wrong!
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Old 04-15-2013, 05:20 PM   #13
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Can't see how a bipes would be better than a decent fully mapable ecu?

The car has a large front mount which reduced air temps drastically, the exhaust maybe is a little small, 2.5" with twin pipes at the rear.

Unfortunately I didn't get a print out of the final run on the rollers, will try and get a print out when I'm next down there.

The car made over 200whp but since then had a replacement cylinder head due to valve guides being worn and the car smoking.

The turbo was a standard greddy unit but has a water cooled subaru core, with the greddy housings.
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Old 04-16-2013, 12:14 AM   #14
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If the only thing that changed is the head then looking at timing (base timing at the cam sensor) and timing belt/cam alignment is the first thing I'd recheck. I put down 262/239 at 17psi tapering to 15 on a Dynojet. The local DynoDynamics reads about 12% lower than the Dynojet I used, but even then it's still 230/210 and way above your numbers.

Quote:
Originally Posted by nitrodann
Ive never been in an greddy with the original greddy turbo that felt anything like 247 hp.

Dann
Next time you are in Colorado drop by
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Old 04-16-2013, 05:00 AM   #15
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Quote:
Originally Posted by nitrodann View Post
Ive never been in an greddy with the original greddy turbo that felt anything like 247 hp.

Dann
Neither have I, we pulled out 7 hp worth of timing.
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Old 04-16-2013, 09:40 AM   #16
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I'm about to close this thread.
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Old 04-17-2013, 02:16 PM   #17
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Whys that?

Checked the cam timing today and looks to be fine, will try and get a printout of the dyno graph next week and post it up.
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Old 04-17-2013, 03:15 PM   #18
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cause you answered one of 3 questions.
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Old 04-17-2013, 03:47 PM   #19
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Quote:
Originally Posted by matthewdesigns View Post
If the only thing that changed is the head then looking at timing (base timing at the cam sensor) and timing belt/cam alignment is the first thing I'd recheck. I put down 262/239 at 17psi tapering to 15 on a Dynojet. The local DynoDynamics reads about 12% lower than the Dynojet I used, but even then it's still 230/210 and way above your numbers.



Next time you are in Colorado drop by
Yeap, doesn't exist
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Old 04-17-2013, 08:45 PM   #20
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Sorry, I did say I didn't have a dyno plot, also said it was a dyno dynamics earlier in the thread and gave the exhaust size. But feel free to close it if need be. Thanks for the helpful suggestions.
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