odd dyno numbers
This is a discussion on odd dyno numbers within the Computer & Tuning forums, part of the LSx Technical Help Section category; I got my pcm back and went up to the dyno to see my numbers. I haven't dynoed it since ...
09-15-2010, 08:38 AM #1
odd dyno numbers
I got my pcm back and went up to the dyno to see my numbers. I haven't dynoed it since the headers and tune. He puts my car on the dyno and runs it. I keep getting crazy numbers like 400+ hp. He said it kept down shifting. He gave a print out. Will post when I get home. Is it the tune screwing with me or what?
Last edited by ls1wallen; 09-15-2010 at 11:30 PM.2001 Formula ported and polished throttle body, Lid, Longtube headers, texas speed true dual, cam is the texas speed 228r 228/228 588. lift 112 lsa, tuned by Frost
09-15-2010, 08:45 AM #2
Why didn't your dyno guy force a 3rd gear pull?? Any good dyno operator can hook up tuning software and force the trans to stay in 3rd gear for a dyno pull.
09-15-2010, 08:55 AM #3
I see nothing in this post that matches the thread title. Thread title changed.
09-15-2010, 09:09 AM #4
09-15-2010, 09:13 AM #5
so you think 400+ HP is low on a LT car??? and why would you think "tune" when the guy was having trouble maintaining a gear on the dyno? Moved to tuning.
09-15-2010, 09:15 AM #6
09-15-2010, 09:18 AM #7
the graph i just posted to the orginal post was what he thought would be my true numbers. the numbers on this sheet are much lower than my old sheet
09-15-2010, 09:20 AM #8
the fact it was downshifting is most likely the culprit. Post up your graph and lets see what it looks like. You might have a mechanical issue going on but it really sounds like that downshift is the issue.
09-15-2010, 09:22 AM #9
You will need a slow steady sweep in a 1:1 gear for any accurate chassis dyno numbers.
Since your car is downshifting your numbers are inaccurate. The trans needs to be forced to stay in a 1:1 gear.
Shucks Orion, you obviously have faster fingers than me,,,lol.
09-15-2010, 09:43 AM #10
called the tuner he said the last 2 runs which are on the sheet. where in 3rd gear..... idk should i look for a differnt dyno? i dont think anytihng is wroung with the car. it still pulls real hard on my buddys mustang and i dont feel a power lose
Last edited by ls1wallen; 09-15-2010 at 09:46 AM.
09-15-2010, 10:23 AM #11
- Join Date
- Jan 2006
- Shepherd, Michigan
blacker than wesleysnipes
- 98' trans am
09-15-2010, 10:25 AM #12
The sheet posted is from an automatic with a locked converter that is held in third. If it downshifts to second then 1. it's not locked anymore which hurts the numbers on the roller (not IRL) and 2. of COURSE pulling it in second gear will make it read really low.
I don't know what the thread title was, but if you don't know these basics then it's certainly not fair to poke at the tune. Why wouldn't you have asked the tuner why he was unable to lock the converter and hold third for the pull? There are multiple way to do it.
The DJ inductive RPM pickup is known to be very noisy with LS cars and it dislikes some aftermarket wires so much that I have to keep a stock plug wire on hand for some cars that come to dyno.
Also, if that graph that is posted was from BEFORE tuning, there is something amiss because the car is lean but it should be really rich on the OEM tune... it looks like it's been tuned though by that AFR.
Last edited by Frost; 09-15-2010 at 11:11 AM. Reason: clarifying
09-15-2010, 10:26 AM #13
- Join Date
- Nov 1999
- over here...
D  V D
- 1999 trans am
thoes numbers look about right for your mods...
09-15-2010, 04:26 PM #14
Ah, I see the dyno sheet now. Don't know if that was posted earlier or if I just couldn't bring it up, my connection was having problems this afternoon.
For a car with just exhaust done, looks like typical numbers to me. Like Frost said, that AFR is floating right above 13.0, so it looks to be tuned to me.
09-15-2010, 11:08 PM #15
so the numbers where buging me. like everyone says numbers dont really mean nothing.
so i called up one of my friends with a mustang at 299hp and around 315tq. so if the dyno is right on one of the pulls, i would be 8 hp more than him.
Warning this video has me doing some gay wave lol!
Last edited by ls1wallen; 09-15-2010 at 11:30 PM.
09-16-2010, 02:04 AM #16
- Join Date
- Nov 2006
- 2000 WS6 6spd Hooker LT
I agree with the others, go to a different dyno.
And that was a gay wave to the Mustang lol.
09-21-2010, 10:10 PM #17
- Join Date
- May 2009
- 2000 trans am
lol nice wave
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