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| Chassis Dyno 9/26/08 https://slantsix.org/forum/viewtopic.php?t=31339 |
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| Author: | Shaker223 [ Fri Sep 26, 2008 9:20 am ] |
| Post subject: | Chassis Dyno 9/26/08 |
I went to the chassis dyno today to see if any of the minor changes I made helped out....long story short....They didn't. I used a Clifford intake over the Offy. My compression was down a little because the copper head gasket is thicker than the steel shim by either .010" or .020" (I can't remember now). I also had the meth start at 4psi rather than 8psi. Timing = same as last year @ 19* total I also replaced the meth 5gph nozzle with a 7gph. The temp was about the same as last year (7*f cooler) but the humidity was up anywhere from 15% to 20% over last year. I also measured the air temp after the intercooler but before the meth. My thermocouple recorded 105*F which was around 33* higher than ambient. (after a run the carb hat was freezing cold to the touch due to the meth) The boost was turned up an additional 2.5psi over last year (almost 24psi). Max RWHP= 253 @ 4050rpm Max RWTQ= 338@ 3900rpm These are almost identical to last year. Peak last year was 259rwhp/345rwtq but that was with 2* more timing. On my best run their AFR didn't record but looking at the other runs it appears like it could be a little lean - mid 12s to high 11s. I'd like to see it in the 11.5 range. |
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| Author: | turbo66valiant [ Fri Sep 26, 2008 12:55 pm ] |
| Post subject: | |
Hey Tom Is this the new motor or the old with a better head gasket? What rearend do you have and at what rpm do you get the 19* total timing? With the old turbo, my car slowed down almost 2 tenths by dropping the timing from 22* to 16*. Your runnning more fuel with the meth so maybe you need more timing also. Your AFR will rise though with more timing. Mine did. Just a thought. When are you adding the bigger turbo? Later. |
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| Author: | Shaker223 [ Sun Sep 28, 2008 4:12 pm ] |
| Post subject: | |
This is still the stock motor. I have a 2.94 gear and I have 19* total just off idle. Last time at the dyno, 19* seemed to be the magic number. 21* was good for maybe only another 5hp/5tq. Actually, the car seemed a tad on the lean side by the AFR readings. That's an easy fix. I'll keep messing with it. |
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