Went to the chassis dyno for the first time....DynoJet Inertial Chassis Dyno
RPM HP TQ A/F
5900 429.5 382.3 4.91
6000 452.6 396.2 4.89
6100 482.1 415.1 5.09
6200 488.1 413.5 5.28
6300 491.8 410.0 5.30
6400 491.4 403.3 5.38
6500 488.6 394.8 5.28
6600 487.1 387.7 5.26
6700 481.2 377.2 5.37
6800 479.3 370.2 5.29
6900 482.0 366.9 5.17
7000 481.5 361.3 5.19
7100 479.6 354.8 5.04
7200 477.6 348.4 5.04
7300 474.8 341.6 5.09
Run after this was 501 with a timing change....
First thing I notice is the converter stalls at 6100, which is bit loose in my book. The fuel mixture at low and high rpm looks a bit fat but I am not sure how to correct that. This is the second of three runs, third lost fuel pressure and laid over just after peak HP. Changed the timing from 36 to 33 and gained roughly 10 horsepower throughout the rpm range. I am extremely curious why the Hp curve is so flat and has two peaks. Numbers look about 100 hp low when compared to weight vs E.T. formulas...those big slicks and loose converter really eat up Hp!
Ran two runs in the Thursday TestnTune and was really happpy....
Rt .011 .010
60' 1.217 1.218
330' 3.526 3.528
660' 5.472 5.475
MPH 125.73 125.82
Ready to go bracket racing!
Strip
i don't understand what you mean by 2 peaks? are you refering to why the engine stays at 491 hp at 6300 and 6400 rpm?
if so, that is most probably where the hp goes "over the top" . like if you pictured it in your mind, compare the curve to the top of a cam lobe. it just happened to stay level at that rpm.
i don't think there is much way to correct the fat mixture at lower rpm....partly because it may be reading that from the "squirt" when you first throttle it.......and partly because if you lean it out at lower rpm, i;m not sure you could keep it fat enough as she winds up.
if you had to choose....too fat or too lean, which would you take?
as for timing, i'm surprised a chevy gained that much with such a low total timing.
like i mentioned in the other thread, we were running our camaro at 31, turning anywhere from 10.1 to 10.3's depending on the weather. we bumped it to 35 degrees, and pretty much instantly dropped into the 9.90's.
you mentioned thre converter stalling at 6100? where's she normally stall? what do you launch at?
