Are our internals horsepower limited or boost limited? - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 05-22-2007, 03:12 PM   #21
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Quote:
Originally Posted by jayc72 View Post
Unnecessary cost. The pistion is unlikely to wear out and require replacing, rings on the other hand ... But really, do you think you'll own this car for 10 more years?
yeah, why would I sell it?
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Old 05-22-2007, 03:15 PM   #22
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Old 05-22-2007, 03:38 PM   #23
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Quote:
Originally Posted by Lex View Post
what is your guys' minimum ignition advance under boost?
19

4k, 8psi.
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Old 05-22-2007, 03:53 PM   #24
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4500rpm, 93 pump gas
17° - 8psi
14° - 12psi
12° - 15psi
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Old 05-22-2007, 03:59 PM   #25
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I was hitting 21-22° at 12.5 psi at 4500RPM, probably have room for more advance
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Old 05-22-2007, 04:02 PM   #26
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15° minimum, ~15 psi @ tq peak

brainy i'm around 17-18 at 12psi. no we didn't push it until detonation, but adding more timing didn't make more power.
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Old 05-22-2007, 04:10 PM   #27
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hmm, looks like I can safely add quite a bit more timing, especially since I am running on 94 octane and 8.2 compression.

I used flyingmiata's ignition map as a base.
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Old 05-22-2007, 04:13 PM   #28
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Awesome ****, guys. That's what I wanted to hear. My goal is to have two maps, a normal 12psi 91 ****-water map and a 15, mabye even 17+psi map once I get a water injection setup. I probably won't push past 275rwhp or so until the motor is built, but I think I can hit that number even on a small T25 and big boost as long as I can keep the intake temps and detonation down (perfect use for WI).
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Old 05-22-2007, 04:32 PM   #29
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Quote:
Originally Posted by Lex View Post
I used flyingmiata's ignition map as a base.

yeah, that was my problem...I also had a 2° retard (i suck) so I was closer to 19-20°

right now my targets are 20° @ 180 kPa; 18° @ 210; and 16° @ 230

I was still making more power as I advanced it, but the returns were starting to become dimishing, my fuel was also way off, so it will probably be altered some. KnocksenseMS is 85% wired up, so I'll be able to make sure all is kosher and ready for my real dyno tuning session.
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Old 05-22-2007, 05:13 PM   #30
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Quote:
Originally Posted by Braineack View Post
yeah, that was my problem...I also had a 2 retard (i suck) so I was closer to 19-20

right now my targets are 20 @ 180 kPa; 18 @ 210; and 16 @ 230

I was still making more power as I advanced it, but the returns were starting to become dimishing, my fuel was also way off, so it will probably be altered some. KnocksenseMS is 85% wired up, so I'll be able to make sure all is kosher and ready for my real dyno tuning session.
Hmm, so why is FM using so much retard on their big turbo kits?
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Old 05-22-2007, 05:18 PM   #31
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Quote:
Originally Posted by Lex View Post
Hmm, so why is FM using so much retard on their big turbo kits?
cuts down on "FM blew up my engine!!!11!!one!!!" complaints.

seriously tho they make it for bad gas and lots of margin of safety.
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Old 05-22-2007, 06:29 PM   #32
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i'm still using FM's stock map..
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Old 05-22-2007, 06:32 PM   #33
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That's OK, you can run 89 octane then.
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Old 05-22-2007, 07:15 PM   #34
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i advanced it 2 degrees, i think i can go a bit more.. i have no knock as far as the knock sensor sees anyway..
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Old 05-23-2007, 05:11 PM   #35
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Ben and Brain, do you guys mind posting up a screenshot of your current ignition maps (
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Old 05-23-2007, 05:19 PM   #36
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should be in my "why i think timing is important thread" but here:




Ben's should be in his "I'm squirting" thread, should look similar.


I have yet to do much testing of this table as I'm not currently driving it untill I get my LC-1 back from innovative. Then I'm getting on a loaded dyno to do some comprehensive tuning. But as is at 12.5psi, I had no signs of knock and the power output seemed butt-dyno friendly.
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Old 05-23-2007, 05:23 PM   #37
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Thanks! how come you are running 14 degrees timing at idle?
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Old 05-23-2007, 05:36 PM   #38
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Quote:
Originally Posted by Lex View Post
Thanks! how come you are running 14 degrees timing at idle?
My map is close enough to brainy's. Why not run 14 deg?
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Old 05-23-2007, 05:51 PM   #39
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Quote:
Originally Posted by Ben View Post
My map is close enough to brainy's. Why not run 14 deg?
I thought stock was around 10 and was wondering if there was a reason for the 14.
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Old 05-23-2007, 11:44 PM   #40
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stock base timing is 10, but without TEN and GND shorted, it varies. measure it sometime.
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