Dyno'd my 15 psi greddy - Miata Turbo Forum - Boost cars, acquire cats.

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Old 10-28-2007, 02:19 PM   #1
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Default Dyno'd my 15 psi greddy

Power
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Torque


Made 243.2 bhp, & 237.2 ft/lbs.
There were two dyno runs, the dotted line is the second dyno run.

Still some issues to work out, need to better setup fueling/timing above 4500 RPM. Pulling way too much timing top end. Looking forward to getting her back on the rollers for try #2
Not too shabby for a Greddy

Last edited by tritium; 10-30-2007 at 10:51 AM.
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Old 10-28-2007, 02:23 PM   #2
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Is boost holding steady at 15psi, or dropping off towards redline? Your power curves look like Ben's, before he used EBC to keep the boost level from dropping off so much. Must be a fun car!
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Old 10-28-2007, 02:29 PM   #3
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Or it could be all the timming he is pulling and a lack of EBC together. I dunno though still that is pretty respectable for some one on the other side of the pond
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Old 10-28-2007, 02:32 PM   #4
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are you running any sort of piggyback or standalone or just base greddy?
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Old 10-28-2007, 02:33 PM   #5
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Boost actually creeps up to about 16 psi at redline, but think I'm pulling way too much timing. I'm pulling the same amount from 5500 RPM onwards, so suspect I could fix this with a few map adjustments. I just wish I'd known this before putting her on the dyno. If it weren't for the torue drop, I'm guesstimating I could've been seeing comfortably over 250 bhp.
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Old 10-28-2007, 02:35 PM   #6
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Quote:
Originally Posted by mazda/nissan View Post
are you running any sort of piggyback or standalone or just base greddy?
E-manage ultimate and Greddy. 460 cc RX-7 injectors, Starion intercooler, Racing Mazda Downpipe, 3" Enthuza exhaust and custom 2.5" silicone IC pipes.
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Old 10-28-2007, 02:37 PM   #7
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Originally Posted by magnamx-5 View Post
I dunno though still that is pretty respectable for some one on the other side of the pond
Cheers, sometimes you guys say the sweetest things
*wipes tear from eye*

Last edited by tritium; 10-30-2007 at 05:33 AM.
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Old 10-28-2007, 04:03 PM   #8
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Quote:
Originally Posted by tritium View Post
E-manage ultimate and Greddy. 460 cc RX-7 injectors, Starion intercooler, Racing Mazda Downpipe, 3" Enthuza exhaust and custom 2.5" silicone IC pipes.
Curiosity, how long did it take for you to get that DP?
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Old 10-28-2007, 04:49 PM   #9
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Originally Posted by mikef85 View Post
Curiosity, how long did it take for you to get that DP?
Interesting that you should mention that, I waited 6 months for mine...


Here she is on the dyno:
http://www.youtube.com/watch?v=pAJfbe7h-AM

Last edited by tritium; 10-28-2007 at 05:31 PM.
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Old 10-28-2007, 05:31 PM   #10
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i stand by my "all you greddy guys need to replace your wastegates" statement.

nice numbers regardless of the torque drop.


i can't believe it creeps us, not with that drop, the hp should be about 20-30 point higher than the torque if the boost held flat.


but again, regardless, it looks like fun.
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Old 10-28-2007, 05:38 PM   #11
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i stand by my "all you greddy guys need to replace your wastegates" statement.

nice numbers regardless of the torque drop.
I'm not certain what you mean, why replace? I've got a helper spring holding the wastegate shut up to 12 psi, I posted about this in another thread a few months ago.
Boost definitely isn't dropping, I'm 100% sure of this.
If you wish, I can show you datalogs right up to near 20 psi at redline, where you can clearly see the boost is increasing (creeping) right up to redline.
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Old 10-28-2007, 05:41 PM   #12
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it actually like to see it. it may just be the scaling of the map that makes the torque look like it drops as if the boost isn't holding like a typical greddy kit.
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Old 10-28-2007, 05:44 PM   #13
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Scaling or not, the tq does drop from about 240 to 170 lbft.
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Old 10-28-2007, 06:27 PM   #14
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Yea, you know I had suspected this before putting the car on the dyno, because I noticed there didn't seem to be much more power from 5000 RPM to redline. I regret not paying more notice to that, hindsight is 20:20 as they say, but its all a learning experience.
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Old 10-29-2007, 10:44 AM   #15
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I wouldn't be surprised if IT is IGN. I lost the same amout of torque when the ecu pulled 10* advance after peak torque from air temp compensation. Torque curve looks very similar.
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Old 10-29-2007, 10:49 AM   #16
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What have you done to make pressure rise towards redline? Every other greddy falls towards redline.

I'm also curious what your intake temps were looking like. I'm wondering if you were loosing power due to the turbo being past its range. At 16 psi in the mani, that could be 20 psi at the compressor outlet.
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Old 10-29-2007, 11:25 AM   #17
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The main problem appears to be that I was overfueling. If you watch the video I posted of the dyno run, at the end of each pull you can hear the engine starting to misfire. This is because as the boost is creeping up it is entering a new region of the fueling map, which wasn't setup efficiently.
I was also pulling too much timing top end. This morning I've spent 5 hours rebuilding the fueling map from scratch, pixel by pixel from datalogs. Its now in its third revision and top end has improved from before. The dyno will say all, just as soon as I can get around to doing that I will.
So far I've only added 1.5 degrees advance beyond 5500 rpm and no sign of knock as of yet, and its helped.
I had run autotune the day before the dyno to try and even out the peak boost AFRs (little boost overshoot) but I'm guessing the LC-1 wideband was perhaps out of calibration and messed up the region of the map between 15 & 18 psi (for safety it was tuned to 18 psi prior to the dyno run).

Ben, I'm using a helper spring to hold the wastegate shut until 12 psi.
I can see from datalogs that boost isn't dropping off.
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Old 10-29-2007, 11:36 AM   #18
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Default Boost remains constant regardless of RPM

Here is a datalog I was looking at earlier.
Blue is boost, the selected value reads 15.8 psi at 6868 revs. And overfueling.
But not by that much, the LC-1 must be out of calibration.
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Old 10-29-2007, 11:36 AM   #19
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could you post a pic of your spring setup, and a datalog of somehting like a 3rd gear pull, so we can see your mastery of the greddy wastegate craptuator?
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Old 10-29-2007, 11:58 AM   #20
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Quote:
Originally Posted by devin mac View Post
could you post a pic of your spring setup, and a datalog of somehting like a 3rd gear pull, so we can see your mastery of the greddy wastegate craptuator?
At once my good man, let thy mastery astound you !
Please see post #11 here:
https://www.miataturbo.net/forums/sh...=helper+spring
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