Got my car on the Dyno...this look right???
#16
Re: Got my car on the Dyno...this look right???
How many pulls did you make on the dyno? If it was just 1 I can see why it would be low... LS1's tend to make better power on the 2nd and 3rd runs. You might have seen 310-315rwhp and 325ish rwtq.
#17
Re: Got my car on the Dyno...this look right???
Originally Posted by BirchMan98z
How many pulls did you make on the dyno? If it was just 1 I can see why it would be low... LS1's tend to make better power on the 2nd and 3rd runs. You might have seen 310-315rwhp and 325ish rwtq.
#18
Re: Got my car on the Dyno...this look right???
Your new 18" rims and tires look nice, but I'd bet they are way heavier than stock... That will hurt your acceleration, braking, handling, and oh yeah... your dyno numbers too.
If you've got an open track nearby, make one pass with your stock wheels and tires, and another pass with your 18" wheels. I wouldn't be shocked to see a 2mph difference in the trap speeds (given similar passes). If so, then that's where your 20 rwhp is missing.
If you've got an open track nearby, make one pass with your stock wheels and tires, and another pass with your 18" wheels. I wouldn't be shocked to see a 2mph difference in the trap speeds (given similar passes). If so, then that's where your 20 rwhp is missing.
#19
Re: Got my car on the Dyno...this look right???
didn't think of that...but they wern't that much heavier than factory, and 20hps gone because of that...i dunno...i think i'm gonna take one off this weekend and weigh it just to see...
#20
Re: Got my car on the Dyno...this look right???
Your numbers are definitely low. LT headers are known to make your car run pig rich. You didn't say what your AFR is, but I venture to say you are on a rich side, which will rob of your HP/TQ.
If you need to correct the AFR, either get it dyno tuned, or use LS1 Edit, or Predator, or ATAP it and use MAF translator to get it corrected.
Also, don't mess with MAF, as an ex-LS1 engine moderator of couple of LSx sites, I have seen people with more problems than gains from using after-market MAF.
If you need to correct the AFR, either get it dyno tuned, or use LS1 Edit, or Predator, or ATAP it and use MAF translator to get it corrected.
Also, don't mess with MAF, as an ex-LS1 engine moderator of couple of LSx sites, I have seen people with more problems than gains from using after-market MAF.
Last edited by 03EBZ06; 03-23-2005 at 07:25 PM.
#21
Re: Got my car on the Dyno...this look right???
Wheels are always within a couple of pounds of each other, but those couple of pounds extra correlates into around 20lbs of roating mass per wheel. Because the wheels are what the engine actually turns, a slight increase in weight of the wheels has more of an impact than you think.
Don't know if I exactly said that right. I'm sure someone knows what I'm talking about.
Don't know if I exactly said that right. I'm sure someone knows what I'm talking about.
#23
Re: Got my car on the Dyno...this look right???
First I have to say "Stock Z28 low"??? wtf is that about?? Mines stock.. 320/337 with 101 intake temp..
You simply cannot compare dyno to dyno.. regardless of name brand. Your best bet, is do a dynoday locally (you can organize it yourself if you really want to) and then compare with others on the same dyno on the same day..
One person may run their dyno better and may keep it in better shape..
Dont worry about what numbers you THOUGHT your car would put out.. Without a baseline pull beforehand, those numbers mean jack squat about your mods.. they just mean that on that particular dyno on that particular day with the settings put into the system, you car produced those numbers.
For dyno days, you can call up local shops with dynos and then see if they are interested in doing 2-3 runs for $35-$45 on a Saturday btw. x and xpm.. Promise to get at least 15 cars and its all good.. then get a date and promote it amoung your local car groups..
Good luck.
You simply cannot compare dyno to dyno.. regardless of name brand. Your best bet, is do a dynoday locally (you can organize it yourself if you really want to) and then compare with others on the same dyno on the same day..
One person may run their dyno better and may keep it in better shape..
Dont worry about what numbers you THOUGHT your car would put out.. Without a baseline pull beforehand, those numbers mean jack squat about your mods.. they just mean that on that particular dyno on that particular day with the settings put into the system, you car produced those numbers.
For dyno days, you can call up local shops with dynos and then see if they are interested in doing 2-3 runs for $35-$45 on a Saturday btw. x and xpm.. Promise to get at least 15 cars and its all good.. then get a date and promote it amoung your local car groups..
Good luck.
#24
Re: Got my car on the Dyno...this look right???
Agreed... my "slower, less powerful" '98 put down 316/326 bone stock barely broken in. I'd say it's a tuning issue or maybe a bad wire somewhere in the mix. Did you happen to run an a/f ratio test? not sure about those trailer dynos either. I'd take it to a shop to get some better information. Are you also positive it wasn't a mustang dyno? If that's the case the numbers look pretty good.
#25
Re: Got my car on the Dyno...this look right???
no it wasn't a mustang dyno...and that's what i was thinking bout the a/f cause i had an SES light on for O2 sensors so i thought maybe it was running lean cause of my GMAF and that was throwing a code but now the light went off yesterday and hasn't come back on yet...so i have no idea!!!
#26
Re: Got my car on the Dyno...this look right???
Originally Posted by Chevy01SS
Nice Numbers man, I'm hoping to put down about the same numbers as you after I get my Pacesetter LT's, ORY, and another tune done.
#27
Re: Got my car on the Dyno...this look right???
Originally Posted by LPE_wannabe
54,600 roughly...not sure on the tune up...havn't checked the plugs or anything...they had a couple fans in front but i dunno if it was enough
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