GT2554 spool is horrible - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 07-15-2008, 09:02 PM   #21
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Thanks for the update Paul, good spool with that 2560! I wish you could post a log with your DD for a better comparison!
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Old 07-15-2008, 09:17 PM   #22
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i'll try tomorrow. i'm actually letting it sit though since the front pads are so low one started grinding. new are on order.
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Old 07-15-2008, 09:28 PM   #23
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NO FEAR: If you aren't living on the edge, you aren't living....
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Old 07-15-2008, 09:51 PM   #24
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'94 1.8 (8.8:1 comp), GT2554R w/ 7psi can, Bell S3 manifold, SSSG DP, 3" metal core cat, 3" Enthuza

the equivalent of a 4th gear pull on a 5speed/4.1 car (5th gear in my car).

1750rpm: 1.0psi
1870rpm: 2.1psi
2014rpm: 3.3psi
2478rpm: 5.4psi
2626rpm: 6.1psi
2783rpm: 7.3psi
3004rpm: 9.4psi
3188rpm: 11.0psi
3394rpm: 12.5psi
3601rpm: 14.1psi
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Old 07-15-2008, 09:52 PM   #25
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Quote:
Originally Posted by paul View Post
3000rpm 10.4
absurd.

I need real boost control instead of this ball 'n spring.
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Old 07-15-2008, 11:48 PM   #26
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you like?

here's what happened when i pulled from 1750rpm

100% tp @ 1750rpm

2000rpm 2.9psi
2200rpm 4.6psi
2500rpm 6.5psi
2700rpm 8.5psi
3000rpm 11.6psi
3200rpm 14.0psi
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Old 07-16-2008, 10:16 AM   #27
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Damn. damn damn.

I will datalog my car for sure, but I think the twins can't get to 14psi til after 4000. They make like 5psi really low but then sorta stay there until the revs climb.

Anyone want a TT setup? Maybe Mark will buy one of the 1548's. Partial trade for a VVT head?

I'll use the stainless absurdflow manifold that I'm making and the 2560 off my subaru. I bet artie is getting anxious.
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Old 07-16-2008, 10:29 AM   #28
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Quote:
Originally Posted by turbotim View Post
I Bet Artie Is Getting Anxious.
Is It Done????
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Old 07-16-2008, 10:32 AM   #29
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Sorry buddy, next week. It's close though.
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Old 07-16-2008, 10:59 AM   #30
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Quote:
Originally Posted by paul View Post
you like?

here's what happened when i pulled from 1750rpm
ok so mine was from 2300. dyno operator gave me the "hammer down" at that point
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Old 07-16-2008, 12:00 PM   #31
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Quote:
Originally Posted by TurboTim View Post
Sorry buddy, next week. It's close though.
It's cool. Perfection needs time. Once its done I can dyno and post my spool numbers here too. Sorry for the thread hijack.
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Old 07-16-2008, 12:01 PM   #32
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Quote:
Originally Posted by Braineack View Post
plus the gutted stock cat....most definitely.

Man, I guess I need to ditch my RB exhaust as well. The T3 spools a tad late, anything quicker would be nice.
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Old 07-16-2008, 12:40 PM   #33
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I performed some mild headwork and I gained a touch better spool.....this was with a 2.25" borla exhaust.



this is no headwork with a MBC compared to headwork with an open wastegate line.... what can clearly tell is the headwork helped spool the turbo a touch earlier....you can also see my boost creep started to appear


upgraded to a 3" magnaflow....the difference is clear:

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Old 07-16-2008, 07:46 PM   #34
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Quote:
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Just gotta talk the girlfriend into it now. BRB.
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Old 07-17-2008, 01:43 AM   #35
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I'm seeing 14psi just before 4000rpm in 4th gear. I suspect I'll get a boost a couple 100rpm sooner when I change out my exhaust. right now it is 2 1/4" Spec Miata exhaust with an extra glass pack resonator. Ideal it's not. No fancy EBC, just a ball and spring MBC.
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Old 07-17-2008, 02:05 AM   #36
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Quote:
Originally Posted by Braineack View Post
I performed some mild headwork[/img]
Cough cough....
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Old 07-17-2008, 10:30 AM   #37
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Quote:
Originally Posted by neogenesis2004 View Post
Cough cough....

there was mild work performed on my head....


happy?
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Old 07-17-2008, 04:11 PM   #38
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Just stealing your lime light :P
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Old 07-17-2008, 04:43 PM   #39
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How about this for an interesting comparison? My setup vs paul vs brian vs Sav
Attached Thumbnails
GT2554 spool is horrible-boost.jpg  
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Old 07-17-2008, 04:59 PM   #40
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I just found my log here that I took about 2 weeks ago just to record my spool....

RPM PSI

2500 1.5psi
2700 3psi
3000 5psi
3300 7psi
3600 10psi
3767 11.6psi
3788 12.9psi
3861 14.0psi
3900 16.2psi

3rd gear, 70*F morning

in fourth, log shows spool is about 150rpm faster.

can you redo with those numberz please.
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