Chinacharger 2560 @ 11psi on a 1999 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 10-28-2010, 12:21 PM   #1
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Question Chinacharger 2560 @ 11psi on a 1999

Installed my GT2560 Churbo, not to happy with the numbers: 217whp 200tq @ 11.8 psi..................also a strange dip in the numbers between 3,800-4,300 rpms Dyno guy said its because my wastgate accuator set to high ( 9 psi ) I should lower it to 6 psi and use the MBC to control the difference ? Does this sound correct ? Set-up as follows: Downpipe 2-1/2, no cat, Borla Sport muffler RB midpipe, RX-7 460cc injectors EMB for control, 73% duty cycle @ wot
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Old 10-28-2010, 12:23 PM   #2
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run it to redline next time. dip is probably the boost overshooting then leveling off, as you can see on the boost plot.
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Old 10-28-2010, 12:30 PM   #3
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Thanks

Last edited by elderc; 10-28-2010 at 02:50 PM.
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Old 12-14-2010, 12:54 PM   #4
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damn i hope i put down more than that when i go to 12 pounds, i'm especially surprised since you have a 99. Still, that's not slow
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Old 12-14-2010, 01:06 PM   #5
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Looks like my GT2554R graph... on a Mustang dyno. Churbo fail once again.
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Old 12-14-2010, 01:08 PM   #6
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was that with a 2.25" exhaust?
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Old 12-14-2010, 02:29 PM   #7
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Quote:
Originally Posted by Savington View Post
Looks like my GT2554R graph... on a Mustang dyno. Churbo fail once again.
Could be tune fail too.
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Old 12-14-2010, 02:49 PM   #8
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Is this a ball bearing turbo with a 60mm 60 trim compressor wheel? Just wonderin, cause I made 209whp/ 206wtq at 11.9psi with a MS-1 parallel running my current turbo. This setup sounds pretty similar to mine, but now I'm running MS2 standalone instead of MS1 parallel. My turbo is a journal bearing unit with a 56mm 60 trim comp wheel. I also had my stock midpipe too. I guess your numbers aren't bad depending on actual turbo size.
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Old 12-14-2010, 07:50 PM   #9
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Journal Bearing, 2.5 exhaust........still I was looking for at least 225whp based on the fact my old Saab turbo (.48/.49) made 217whp on 11psi. Churbo specs. Compressor a/r .60 (42.6-60 trim 51 ) Turbine a/r .64 ( 46.2-53 trim 79 )

Last edited by elderc; 12-14-2010 at 08:06 PM.
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