TSP 231/237 on stock heads
Originally Posted by 66deuce
ok,i'm not saying you should ignore dyno numbers.i guess i should have explained my opinion better.
That's a good thing to point out about dyno variance. Of course this should only be 10 hp or so, unless somebody is up to some kind of shenannigans.
i've also seen some lower HP cars beat cars that had more HP,at least on paper.
thanks for calling me stupid,lol.
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Originally Posted by black_knight
Right, but things like this can be chalked up to gears, driver skill, car weight, etc. If a dyno says that a car is down on power, the good money is on that car being down on power. Even if it does run better than "car x" at the track, it still isn't a good idea to ignore the dyno. It's never a good idea to ignore the facts.
Originally Posted by koolaid
Not trying to be a dick, but aren't track numbers factual? Which one would you rather have - better track times, or higher dyno numbers? You have to pick one in this case.
I am not saying that the GOAL is good dyno numbers: that attitude is retarded.
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I am by no means a tuning expert, but can someone explain how the bad O2 affects WOT dyno numbers, especially ones with a damn near perfect a/f ratio. It is my understanding, as it was someone elses earlier in the post, that the computer does not even look at the O2's in WOT conditions. Now granted, if he had been cruising around with a bad O2 for some time and the computer and learned it that way and made adjustments based on the bogus fuel trims it received, then I could see it having an effect. But, then again would that not throw off is a/f ratio that was monitored during the dyno session.
The only ways I can see that it would have effected his numbers is if he is running true duals, and the side with the bad O2 was on the opposite side from where the exhaust was taken for the O2 reading on the dyno. Consequently resulting in one side being almost perfect, and the other all out of whack. That is unless the O2 also affects the timing tables or something like that, but then again, it ignores the O2 during WOT, so it would have to be some sort of learned behavior.
Or the bad O2 sent into some sort of limp mode, in which case he has one B/A car to make 372 HP in limp mode ??? where are our tuning experts???
The only ways I can see that it would have effected his numbers is if he is running true duals, and the side with the bad O2 was on the opposite side from where the exhaust was taken for the O2 reading on the dyno. Consequently resulting in one side being almost perfect, and the other all out of whack. That is unless the O2 also affects the timing tables or something like that, but then again, it ignores the O2 during WOT, so it would have to be some sort of learned behavior.
Or the bad O2 sent into some sort of limp mode, in which case he has one B/A car to make 372 HP in limp mode ??? where are our tuning experts???
Last edited by BOWTIE; Jan 15, 2005 at 10:07 PM. Reason: add
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Originally Posted by BOWTIE
I am by no means a tuning expert, but can someone explain how the bad O2 affects WOT dyno numbers, especially ones with a damn near perfect a/f ratio. It is my understanding, as it was someone elses earlier in the post, that the computer does not even look at the O2's in WOT conditions. Now granted, if he had been cruising around with a bad O2 for some time and the computer and learned it that way and made adjustments based on the bogus fuel trims it received, then I could see it having an effect. But, then again would that not throw off is a/f ratio that was monitored during the dyno session.
The only ways I can see that it would have effected his numbers is if he is running true duals, and the side with the bad O2 was on the opposite side from where the exhaust was taken for the O2 reading on the dyno. Consequently resulting in one side being almost perfect, and the other all out of whack. That is unless the O2 also affects the timing tables or something like that, but then again, it ignores the O2 during WOT, so it would have to be some sort of learned behavior.
Or the bad O2 sent into some sort of limp mode, in which case he has one B/A car to make 372 HP in limp mode ??? where are our tuning experts???
The only ways I can see that it would have effected his numbers is if he is running true duals, and the side with the bad O2 was on the opposite side from where the exhaust was taken for the O2 reading on the dyno. Consequently resulting in one side being almost perfect, and the other all out of whack. That is unless the O2 also affects the timing tables or something like that, but then again, it ignores the O2 during WOT, so it would have to be some sort of learned behavior.
Or the bad O2 sent into some sort of limp mode, in which case he has one B/A car to make 372 HP in limp mode ??? where are our tuning experts???
Originally Posted by koolaid
Good question. I really don't know what the o2's do at WOT. I was just told that my bad o2 had something to do with the numbers, along with not having the rest of the boltons at the time.
Really those numbers are fine, if he gets that pulley he'll be around 380 or so. every car is different.
Now, if you dynoed 350 @ the wheels, you might have accientlly put in the Hot Cam instead of the 231/237. or a problem.
His stock HP #'s may have been lower than others
Now, if you dynoed 350 @ the wheels, you might have accientlly put in the Hot Cam instead of the 231/237. or a problem.
His stock HP #'s may have been lower than others
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Originally Posted by SSTYCOON
Really those numbers are fine, if he gets that pulley he'll be around 380 or so. every car is different.
Now, if you dynoed 350 @ the wheels, you might have accientlly put in the Hot Cam instead of the 231/237. or a problem.
His stock HP #'s may have been lower than others
Now, if you dynoed 350 @ the wheels, you might have accientlly put in the Hot Cam instead of the 231/237. or a problem.
His stock HP #'s may have been lower than others
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Dont worry about it much Brad, alot of the people bashing your numbers probably didn't take a lot of factors into consideration. Type of Dyno, fan in front of the car or not, the fact you are on 18's, bad 02's, conservative tune, no LS6 intake, no TB, no pulley, the year of your car, and mileage. Track numbers are what count, not dyno numbers.
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From: Denton, TX
Originally Posted by bluestreak98
Dont worry about it much Brad, alot of the people bashing your numbers probably didn't take a lot of factors into consideration. Type of Dyno, fan in front of the car or not, the fact you are on 18's, bad 02's, conservative tune, no LS6 intake, no TB, no pulley, the year of your car, and mileage. Track numbers are what count, not dyno numbers.
Originally Posted by bluestreak98
Dont worry about it much Brad, alot of the people bashing your numbers probably didn't take a lot of factors into consideration.
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I do have an LS6 intake.....
2000 SS #3157
Mods: TSP 231/237, coated Pacesetter LT headers, Lane's 3" duals, LS6 intake, Stage III ported TB, LS6 ported oil pump, Rollmaster double roller timing chain, Crane dual valve springs, TSP hardened push rods, titanium retainers, MSD wires, MTI lid, K&N, custom LS1 edit, 160* stat, B&M shifter, Z06 wheels.
373rwhp/355rwtq (with bad o2's)
2000 SS #3157
Mods: TSP 231/237, coated Pacesetter LT headers, Lane's 3" duals, LS6 intake, Stage III ported TB, LS6 ported oil pump, Rollmaster double roller timing chain, Crane dual valve springs, TSP hardened push rods, titanium retainers, MSD wires, MTI lid, K&N, custom LS1 edit, 160* stat, B&M shifter, Z06 wheels.
373rwhp/355rwtq (with bad o2's)