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#2041
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Quote:
No getting hot, or too much CR. More power.
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
#2042
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Let me clarify the lean comment. It was lean at idle after starting it up after sitting for about a week. AFR during a run was 11.9 to 12.2 Timing at 30lb was peak 27 degrees
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2023 Best ET Slip 60’ 1.224 330 3.186 1/8 4.784 MPH 152.07 1000 6.175 ET 7.347 MPH 189.92 Weight 3650 YouTube Channel --> https://www.youtube.com/channel/UC21...rWwgFdfTRqShGQ FaceBook Group --> https://www.facebook.com/groups/220092308823847/ |
#2043
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Methanol, sometime in the future when we decide to drop weight. I'd like to figure this out before switching fuel. CR is 10:1. Another theory, valves hanging open/not sealed? We were having issues with lash going away.
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2023 Best ET Slip 60’ 1.224 330 3.186 1/8 4.784 MPH 152.07 1000 6.175 ET 7.347 MPH 189.92 Weight 3650 YouTube Channel --> https://www.youtube.com/channel/UC21...rWwgFdfTRqShGQ FaceBook Group --> https://www.facebook.com/groups/220092308823847/ |
#2044
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27* is a lot of timing for 30psi . Didnt they move the plug over to in front of the exhaust valve an give this head a heart shaped chamber? Thats a real efficient chamber . I have the new Edelbrock head with all that done to it and @30psi it only wants 18*. Something to try would be taking some timing out and richening it up a bit more . What are the egt's at 30 psi with 27*?
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My Half AN Injun..... |
#2045
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the time it build boost at launch seems way to long -- how much timing are you pulling at that point????
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#2046
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The chambers are heart shaped. No EGTs yet. When we get it back together, we'll pull a bunch of timing out and then ramp in back in slowly again.
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2023 Best ET Slip 60’ 1.224 330 3.186 1/8 4.784 MPH 152.07 1000 6.175 ET 7.347 MPH 189.92 Weight 3650 YouTube Channel --> https://www.youtube.com/channel/UC21...rWwgFdfTRqShGQ FaceBook Group --> https://www.facebook.com/groups/220092308823847/ |
#2047
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On most of the passes we weren't pulling timing on the brake, it was at 32. When we did try pulling timing on the last run when it stalled on the line, it was at 30, which was not expected as the timing offset was set to pull 12 degrees.
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2023 Best ET Slip 60’ 1.224 330 3.186 1/8 4.784 MPH 152.07 1000 6.175 ET 7.347 MPH 189.92 Weight 3650 YouTube Channel --> https://www.youtube.com/channel/UC21...rWwgFdfTRqShGQ FaceBook Group --> https://www.facebook.com/groups/220092308823847/ |
#2048
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seems like something is wrong -- we were pulling 8 or so on the brake over 5000 or so rpm and the boost was in 1.2 seconds. we set the programable waist gates to ramp up from a low setting to max setting in steps over about a second or second and a half, maybe 4 or 5 steps.
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#2049
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Do you have EGT's???? we ran the car rich -- 11.5 or so and had egt's in the mid 1600 range after we changed to a better exh. housing we were pushing 1800 with the more restrictive one.
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#2050
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Yeah, we need some tuning work here.
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2023 Best ET Slip 60’ 1.224 330 3.186 1/8 4.784 MPH 152.07 1000 6.175 ET 7.347 MPH 189.92 Weight 3650 YouTube Channel --> https://www.youtube.com/channel/UC21...rWwgFdfTRqShGQ FaceBook Group --> https://www.facebook.com/groups/220092308823847/ |
#2051
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Quote:
No EGT's, Average back pressure ratio over a run is ~1.5:1.
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2023 Best ET Slip 60’ 1.224 330 3.186 1/8 4.784 MPH 152.07 1000 6.175 ET 7.347 MPH 189.92 Weight 3650 YouTube Channel --> https://www.youtube.com/channel/UC21...rWwgFdfTRqShGQ FaceBook Group --> https://www.facebook.com/groups/220092308823847/ |
#2052
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A few before/after pics of the chambers.
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2023 Best ET Slip 60’ 1.224 330 3.186 1/8 4.784 MPH 152.07 1000 6.175 ET 7.347 MPH 189.92 Weight 3650 YouTube Channel --> https://www.youtube.com/channel/UC21...rWwgFdfTRqShGQ FaceBook Group --> https://www.facebook.com/groups/220092308823847/ |
The Following User Says Thank You to RAIV-Z For This Useful Post: | ||
#2053
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That 4th picture is really showing that its getting way to hot. Its melting the aluminum . That looks just like my E-head chamber with the spark plug moved real close to the exhaust valve and a heart shaped chamber.
I had to reduce all my timing when i changed over to the new style head . Just to give you an idea , I ran 24 degrees at 30psi with the old head design. Now its 17 degrees @ 30psi with new head. 40Psi was at 18* now its at 12* . Do you have Inconel exhaust valves installed in your heads?
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My Half AN Injun..... Last edited by charlie66; 09-17-2023 at 05:38 AM. |
#2054
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I forgot to say, You did a really nice repair job on your chambers! Looks excellent..
Good luck ...
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My Half AN Injun..... |
The Following User Says Thank You to charlie66 For This Useful Post: | ||
#2055
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We had Edelbrock and Tiger heads that looked allot like your before pictures when we were running the Grocery Getter. Just not allot of real estate between those seats. The copper beryllium seats hold position long after the aluminum is softened and blown out. The fix for us was to completely ignore the "experts" who were guiding our tune-up based on Chevy combinations. After melting 40 pistons in one year, we began taking out large amounts of timing and the problems went away. Every time we took out timing, the car went faster and lived longer. We kept taking it out a couple degrees at a time until the car finally slowed down. That ended up being total timing of 6 degrees BTDC, spraying 600 HP of nitrous in Tiger heads. The digital MSD box allowed 25 degrees of retard and we used 24 of it. Base 30 degrees, 6 degrees down track.
I fully realize, you are twin turbo and there is no direct correlation between our nitrous tune-up and your ultra sophisticated turbo set-up. But just like our engine, your's is telling you something. It doesn't like that much timing and it is melting the aluminum. We were just amazed each time we reduced the timing, the car just loved it. Best of luck with the tuning process. |
The Following 2 Users Say Thank You to mgarblik For This Useful Post: | ||
#2056
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Quote:
Yes, Ti Intake and Inconel Exhaust. When we get it back together well pull the timing way back to start with again.
__________________
2023 Best ET Slip 60’ 1.224 330 3.186 1/8 4.784 MPH 152.07 1000 6.175 ET 7.347 MPH 189.92 Weight 3650 YouTube Channel --> https://www.youtube.com/channel/UC21...rWwgFdfTRqShGQ FaceBook Group --> https://www.facebook.com/groups/220092308823847/ |
#2057
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Thanks for the feedback. We're also going to soften up the chamber a bit on this go around.
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2023 Best ET Slip 60’ 1.224 330 3.186 1/8 4.784 MPH 152.07 1000 6.175 ET 7.347 MPH 189.92 Weight 3650 YouTube Channel --> https://www.youtube.com/channel/UC21...rWwgFdfTRqShGQ FaceBook Group --> https://www.facebook.com/groups/220092308823847/ |
#2058
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Hub Dyno Session last December, EGT's looking a bit on the hot side.
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2023 Best ET Slip 60’ 1.224 330 3.186 1/8 4.784 MPH 152.07 1000 6.175 ET 7.347 MPH 189.92 Weight 3650 YouTube Channel --> https://www.youtube.com/channel/UC21...rWwgFdfTRqShGQ FaceBook Group --> https://www.facebook.com/groups/220092308823847/ |
The Following User Says Thank You to RAIV-Z For This Useful Post: | ||
#2059
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Very nice numbers. How much boost is this at?
Stan
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Stan Weiss/World Wide Enterprises Offering Performance Software Since 1987 http://www.magneticlynx.com/carfor/carfor.htm David Vizard & Stan Weiss' IOP / Flow / Induction Optimization - Cam Selection Software http://www.magneticlynx.com/DV Download FREE 14 Trial IOP / Flow Software http://www.magneticlynx.com/DV/Flow_..._Day_Trial.php Pontiac Pump Gas List http://www.magneticlynx.com/carfor/pont_gas.htm Using PMD Block and Heads List http://www.magneticlynx.com/carfor/pont_pmd.htm |
#2060
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Hi Stan,
That was at 28.1lb peak boost.
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2023 Best ET Slip 60’ 1.224 330 3.186 1/8 4.784 MPH 152.07 1000 6.175 ET 7.347 MPH 189.92 Weight 3650 YouTube Channel --> https://www.youtube.com/channel/UC21...rWwgFdfTRqShGQ FaceBook Group --> https://www.facebook.com/groups/220092308823847/ |
The Following User Says Thank You to RAIV-Z For This Useful Post: | ||
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