High Compression Turbo'd Motors....
10-06-2003, 10:38 PM
#15
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Join Date: May 2002
Location: California
Posts: 22,465
Originally Posted by 1Revvin7' date='Oct 6 2003, 06:57 PM
[quote name='j9fd3s' date='Oct 6 2003, 11:41 AM'] id use the s4 rotors, its not hard to get into detonation, we had the 20b pinging at 7 psi on 91 octane, this weekend.
my opinion is that unless you're right on with your tuning you're gonna be pulling the engine apart again
mike
my opinion is that unless you're right on with your tuning you're gonna be pulling the engine apart again
mike
well i looked at the timing and it was just flat after 3500rpms, 20+degrees
10-06-2003, 11:29 PM
#16
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Join Date: Jun 2003
Location: San Antonio TX/Okinawa Japan
Posts: 208
Ran a 87 n/a motor with the 9.4 rotors. Port matched the turboII LIM to the n/a motor. The turbo was a T3 60-1 .82 a/r stage III wheel from cheapturbo.com. 19-21 psi. Home made water/air intercooler. The combination of the "small" turbine and the 9.4 rotors made for very good throttle response. After seeing it run at the track people thought I was spraying. This setup had good top end also. 125mph in the 1/4. car weight was 2720lbs. Ran this set up for 6 months with allot of passes at the track. Now running a 87 turboII motor that is bridged on the secondary and ported up on the primary and secondary ports, exhaust was also ported down only. Tubo is a T66 with .96 a.r P-trim. 20-22psi. Thinking of going to .81 a/r to get some of the throttle response back or replacing the rotors with n/a ones. The top end feels stronger but only yielded 3 mph more in the 1/4. Did not get a chance to dyno tune this set up. (moved). I feel this setup would have gone 132mph + or - if tuned. My next motor will have the 9.4 rotors, turboII middle plate, n/a front and rear plates, turboII housing and port the two end plates to where there is only one big port. The second set up was better for the track but the first set up was allot better for the street.
chuck
chuck
10-06-2003, 11:51 PM
#17
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Join Date: Nov 2001
Location: Bay Area, CA
Posts: 7,316
Originally Posted by j9fd3s' date='Oct 6 2003, 07:38 PM
[quote name='1Revvin7' date='Oct 6 2003, 06:57 PM'] [quote name='j9fd3s' date='Oct 6 2003, 11:41 AM'] id use the s4 rotors, its not hard to get into detonation, we had the 20b pinging at 7 psi on 91 octane, this weekend.
my opinion is that unless you're right on with your tuning you're gonna be pulling the engine apart again
mike
my opinion is that unless you're right on with your tuning you're gonna be pulling the engine apart again
mike
well i looked at the timing and it was just flat after 3500rpms, 20+degrees
That doesn't sound right.
10-06-2003, 11:51 PM
#18
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Join Date: Sep 2002
Location: Savannah, Ga
Posts: 2,763
Originally Posted by sleeper7' date='Oct 7 2003, 12:29 AM
My next motor will have the 9.4 rotors, turboII middle plate, n/a front and rear plates, turboII housing and port the two end plates to where there is only one big port.
10-11-2003, 12:18 AM
#19
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Join Date: Jun 2003
Location: Culpeper, VA
Posts: 572
Originally Posted by White_FC' date='Oct 5 2003, 11:28 PM
I'll never build/buy a motor with low comp rotors, I think having low comp rotors is just a band aid solution to poor tuning/setup.
10-11-2003, 01:35 PM
#20
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Join Date: May 2002
Location: California
Posts: 22,465
Originally Posted by 13BAce' date='Oct 6 2003, 08:51 PM
[quote name='j9fd3s' date='Oct 6 2003, 07:38 PM'] [quote name='1Revvin7' date='Oct 6 2003, 06:57 PM'] [quote name='j9fd3s' date='Oct 6 2003, 11:41 AM'] id use the s4 rotors, its not hard to get into detonation, we had the 20b pinging at 7 psi on 91 octane, this weekend.
my opinion is that unless you're right on with your tuning you're gonna be pulling the engine apart again
mike
my opinion is that unless you're right on with your tuning you're gonna be pulling the engine apart again
mike
well i looked at the timing and it was just flat after 3500rpms, 20+degrees
That doesn't sound right. [/quote]
yah, we have a decent fuel map but the timing was just haltech base map over 3500, i fixed it is good now
mike