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Post by highpockets on Oct 8, 2008 6:24:24 GMT -7
I'm glad I read through this entire post just now, I think I'm feeling a lot better about my 'slo-vette' Not because of your issues Nate but I'm feeling better knowing that when my car showed 390 rwhp that it was corrected to sea level. So when I hit the track and ran a 14.1 @ 107 I was doing it with less than 390 rwhp... Oh crap, what am I saying, that's still horrible LOL Ok, back to your car, I think your dyno graph looks exactly like it should for the power adders that you're using. If you're looking for a quicker ET... then get the traction issues sorted with tires made for the track. And if you're not worried about the ET's as much as you are just plain baffled how a 'stocker' LS2 beats your blown LS2... then I'm with you! And I'll add to the confusion by asking how in the world could I run a 14.03 @ 106 when I was putting down 300 rwhp 'before getting tuned' and then run a 14.1 @ 107 with 390 rwhp 'after getting tuned' I think the Utah air doesn't like to be compressed Oh I dont know about that ! Seems like Utah air can be "compressed" just fine ! ;D
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Post by tom400cfi on Oct 8, 2008 10:16:01 GMT -7
And if you're not worried about the ET's as much as you are just plain baffled how a 'stocker' LS2 beats your blown LS2... then I'm with you! And I'll add to the confusion by asking how in the world could I run a 14.03 @ 106 when I was putting down 300 rwhp 'before getting tuned' and then run a 14.1 @ 107 with 390 rwhp 'after getting tuned' To answer that question, you didn't pick up 90 RWHP, that's how. You picked up 1 mph which is essentially nothing (could have been driving or air temps). I don't know your history. When/where did you dyno 300 RWHP? Then when/where did you dyno 390? Same dyno? What "tune"? Can you clarify some? It SOUNDS like you think you picked up 90 RWHP from a tune, on a stock or stockish LS2. No way that happened. You ran 14.xx @106 and 14.xx @107 because your car is making ROUGHLY 340 RWHP, at sea level, but more accurately, roughly 300 rwhp, in Salt Lake City. Just like Nate is trapping ~105; the fact is, when he's running at the track, he's only making about 320 rwhp, in spite of what his dyno run shows.
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Post by 500hp406 on Oct 8, 2008 10:21:28 GMT -7
ok---I have a question... So what is it? My question was---every one else is traping a couple mile per hour faster, with the same ETs, so what is my horsepower
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Post by tachout on Oct 8, 2008 10:57:27 GMT -7
Tom both tines the Vetdream had his car on the dyno it was on Nathans Dyno, so the Dyno was the same, and the car did not change. His tune was wacked the first time he had it tuned. Not sure all what was wrong originally but it was a bumpy ride for sure. Just a ton of up and down and up and down on the charts. Once the hp and torque curves smooted out it came up quite a bit. I think he was in the 170+ MPH on his first time at the dyno too, so some of his slow Quarter Mile times, are gears too!
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Post by Crossfire84 on Oct 8, 2008 11:02:41 GMT -7
A little bit less than theirs. There is no direct correlation between ET and power. The MPH is the power indicator.
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Post by 500hp406 on Oct 8, 2008 11:10:16 GMT -7
I wonder how much the 700r tans has to do with it, I have just shifted into 3rd as I pass the finish line
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Post by tom400cfi on Oct 8, 2008 11:19:42 GMT -7
My question was---every one else is traping a couple mile per hour faster, with the same ETs, so what is my horsepower How much power? ~380-390, IMO, SEA Level, Crank hp. If you ran your car at sea level, you'd trap around 110-114, which is in line w/other 3400#, just-under-400-crank-hp cars. Take that 390 hp, minus 12% for eleveation (3% per 1000 feet) and you have ~342 Crank hp, and your trapping in the mid 100's in a 3400 lb car, here. These numbers all add up.
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Post by tom400cfi on Oct 8, 2008 11:24:55 GMT -7
Tom both tines the Vetdream had his car on the dyno it was on Nathans Dyno... I think he was in the 170+ MPH on his first time at the dyno too, so some of his slow Quarter Mile times, are gears too! I don't know what to make of this, but Vetdreams numbers and Nate's numbers (1/4 traps vs. dyno numbers), don't add up. You can't have 90 more hp and trap the same speed, I don't care what gears you have. Trap tells the whole story, and with 90 more hp, Vetdream should have easily trapped ~10 more mph. Notice that I've not addressed ET's at all. That is way, WAY more driver skill (and tire) related. These guys are talking about hp, which is easily and fairly consistently measured via trap.
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Post by 500hp406 on Oct 8, 2008 11:38:29 GMT -7
Tom, I have numbers from 2 desktop dynos show I should have between 490 and 500 fwhp. I need to find someone who can tune, using an Acell gen 7 DFI, and see if I can find some more hp. If anyone knows of anyone please tune in..
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Post by tom400cfi on Oct 8, 2008 12:05:31 GMT -7
Tom, I have numbers from 2 desktop dynos show I should have between 490 and 500 fwhp. I need to find someone who can tune, using an Acell gen 7 DFI, and see if I can find some more hp. If anyone knows of anyone please tune in.. Yeah, for your given combo, there's probably more in it. If you were making 500 FWHP (sea level), that would be 440, here. 440 FWHP, 3400# car should trap around 118, and clearly, you're no where near that. You're right to want to tune it. Step #1, IMO would be to put it on Nathan's Dyno, and observe the WBO2 readings. Never mind about the power, just look at what your A/F ratios are, for starters. OR just buy a WBO2 and so some test pulls w/it, all the way through a gear. Then you'll have a some facts about the status of yoru current tune, and knowledge of what can be done about it. You don't need a Accel DFI experienced tuner to get started w/that research.
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Post by 500hp406 on Oct 8, 2008 12:16:12 GMT -7
I have figure out how to make the computer lock out the torque converter in 3rd gear, in order to have the Dyno to give us a correct number. Right now it only locks oout in 4th. I have a wide band on the car right now, I may want to recalculate the wide band before starting the dyno runs to clear it and start over on the o2 readings
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nathan
Junior Member
Posts: 66
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Post by nathan on Oct 8, 2008 13:40:36 GMT -7
I can do it with HP tuners, it will be here this week then we can lock it in 3rd for you on the dyno.
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Post by tom400cfi on Oct 8, 2008 14:52:19 GMT -7
I have figure out how to make the computer lock out the torque converter in 3rd gear, in order to have the Dyno to give us a correct number. No, don't worry about that. Right now, "the number" that get's spit out of a dyno doesn't matter. It's not important and it won't help you move forward. In fact, starting out, I'd encourage you to ignore the number that is reported by the dyno, and focus only on how the engine is running. What IS important right now is to learn what your A/F ratios are, through out the RPM range, at WOT. (a side bonus would be learning your A/F ratios through out the RPM range at a hole bunch of different throttle settings, for better drivability and fuel economy) For that, it doesn't matter if the converter is locked, unlocked or even if it locks in the middle of the test. Doesn't matter.
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Post by 500hp406 on Oct 8, 2008 14:59:28 GMT -7
I will visit with you tonight
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Post by tom400cfi on Oct 8, 2008 16:13:08 GMT -7
10-4. See you there!
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