Dyno queens inside
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From: Okinawa, Japan
Dyno queens inside alright all you guy that put up these big numbers id like to see acual numbers because im starting to think that your numbers are being corrected a little on the high side......i realized this when i went to the dyno yesterday....heres the story....my 02 ws6 always a strong runner made 338 350 lid corsa catack..... added a 224 581 112 cam Jet hot LT's ORP turned the rev limiter up and added 2 degrees of timing and it made 396 rwhp 387rwtq......heres the kicker my numbers were SAE corrected at a rate of CF=1.05 so actual numbers for the day were high 370's.....added a moser 12 bolt 3:90's TEA Stage 2 5.3's cut .015 and an ASP crank pulley went to the dyno yesterday hoping for 435 plus.(going by my old numbers) and put down 420rwhp 396rwtq....yes i know the 12 bolt soaks up about 10 hp and 10 tq and i am NOT displeased with those numbers....heres the kicker as well the SAE correction factor this time was .99 so it brought my ACTUAL numbers from 425 down to 420.....my car has never needed tuning i just added timing when i did my cam and thats it a/f always been good.....id just like to know all these guys that are getting these big numbers what are the SAE correction factors theyre going by my bet is theyre high like the first time i went to the dyno because at first i was dissapointed in my numbers but all things considered(12 bolt, gears and CF) my car performed VERY well for the mods, i still lack a ported Tbody, waterpump, and a SSRA and i did all this on a baby C2 hammer cam........btw what does everyone else think of my numbers? 
Don't believe all the dyno numbers you see on the net. Dyno numbers can have ALOT of discrepancy between shops and operators. Look for trap speed and raceweight as a good indicator, as well as weather conditions and DA.
There are some high HP cars on here but other cars running the same exact setup put out much lower HP.The more power to them..
Here is my 12 bolt loss
before 382hp
after 360hp
This was when I was cam only.Gives you an idea.
Here is my 12 bolt loss
before 382hp
after 360hp
This was when I was cam only.Gives you an idea.
22 hp, about what I thought going from a stock rear to a real one. I have heard 10 hp just going from 3.42's to 4.10's in the stock rear. I don't even look at dyno numbers unless they are through a 12bolt or 9 inch. In my opinion, you won't be able to use that hp with any type of sticky tire.
Originally Posted by glhs379
Don't believe all the dyno numbers you see on the net. Dyno numbers can have ALOT of discrepancy between shops and operators. Look for trap speed and raceweight as a good indicator, as well as weather conditions and DA.
I dont concider myself a dyno queen but as for the correction factor of the dynos I did 425rwhp sae and 450 actual hp
I guess that would be a -1.06 correction factor. I think i might have made more if i didnt have stock injectors but thats for another day.BTW i dropped these #`s at a dyno day with 30+ witnesses that there was no monkey business.
On a different dyno in a different state on a 90 deg summer day with tranny with a bit of slip i made 421 sae but i did not get the actual # because most people dont post those.
Last edited by offaxis; Jan 9, 2004 at 05:40 PM.
Trap speed? My cars trap speed can range big time depending on the weather and the tires I run. Even where I shift affects my trap speed w/ very little change in the 1/4 mile time. I think dynos are the way to go for tuning and to determine power. HP and TQ vary from the factory and they will vary between cars w/ similar mods. I do agree that some dyno guys don't have a clue but that's on you. Find someone that knows what he is doing before you waist you time or go to two different dynos. That's what I did and they were dead on. Later
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I'll show you a dyno queen here in a few weeks. We're taking the RMS formula which made 463rwhp/418rwtq(ran 10.9s at 124mph in 1300DA) and sellling off the 12 bolt with 4.56's and switching it back to a stock 10 bolt with 3.42's. Switching the LS1 heads that were on it to some better flowing LS6 Stage 2 RMS heads and adding the TPIS oval intake/TB.
Now this could be interesting.
Now this could be interesting.
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It was pretty cold out the day I had mine dyno tuned. The Uncorrected numbers were in the 490's and my SAE corrected was 457rwhp and this was in an A4 with a 12bolt w/ 4.11's. Pre tune numbers were in the 390's with an A/F of 11.1:1 and the car ran high 10's. I will get more updated track results once spring gets here..
That is why I said to look at trap speed AND raceweight AND DA. All three will take into consideration lighter cars trapping higher with lower hp numbers or weather conditions causing lower or higher trap speeds. There are plenty of hp and correction formulas on the net to correct you time slip to sae or standard. Then you can compare it to another timeslip.
One car running 120 at +2000 da and another car running 120 at -1500, guess who is making more power, if both cars have equal raceweights.
One car running 120 at +2000 da and another car running 120 at -1500, guess who is making more power, if both cars have equal raceweights.
Originally Posted by glhs379
That is why I said to look at trap speed AND raceweight AND DA. All three will take into consideration lighter cars trapping higher with lower hp numbers or weather conditions causing lower or higher trap speeds. There are plenty of hp and correction formulas on the net to correct you time slip to sae or standard. Then you can compare it to another timeslip.
One car running 120 at +2000 da and another car running 120 at -1500, guess who is making more power, if both cars have equal raceweights.
One car running 120 at +2000 da and another car running 120 at -1500, guess who is making more power, if both cars have equal raceweights.
I think you would have to put traction into the equation also. But I do completely understand what you are saying. All I ment was how do you know that they are claiming the correct race weight and DA? I know there are people that either really dont know the correct info and just guess or just say what they want to make them more impressive. Im not sure why but I have seen a couple guys at the track with there cars interiors stipped to the bone no front bumpers / AC / and lightweight bogarts all around claim 3500+ race weight when the I talked to the drivers that are lucky to weigh 150-170 pounds. I like to take everyone at there word so I was very supprised to see this. It really doesnt matter to me but I think some people do care .
There are way too many factors to compare... Suspension, Raceweight, mods, headers, fuel, safe tune, race tune, Head wind, tail wind, altitude, DA, Tires, Driver, track is running up hill, track is running down hill...
Just line 'em up... The bull **** stops when the green light drops
It is a complete package all working together. You can have all the hp in the world but if you can't put it to the ground then it is of no use. Just because someone has a 450hp motor doesn't mean they are going to run 10's. Dyno numbers are nice as far as trying to get a comparison on where you sit but there is a lot more to it than just that. Ask any real drag racer what the most important part of a run is and they will all tell you the first 60'. It is all in the setup as a whole...
Just line 'em up... The bull **** stops when the green light drops
It is a complete package all working together. You can have all the hp in the world but if you can't put it to the ground then it is of no use. Just because someone has a 450hp motor doesn't mean they are going to run 10's. Dyno numbers are nice as far as trying to get a comparison on where you sit but there is a lot more to it than just that. Ask any real drag racer what the most important part of a run is and they will all tell you the first 60'. It is all in the setup as a whole...
The correction factors do have an effect. I have the impression it's easier to post big numbers on hot days with higher correction factors. When my car w/catback, lid, maf etc made 323rwhp the cf was 1.02 later when the cf was .98 the car made 317rwhp but could be leaned out to make 323rwhp again because it was cooler.
Me thinks 425rwhp is good for that setup. Nothing out of the ordinary, but through a 12 bolt thats some strong numbers. I'm running a similar cam, but don't have heads yet and yours made more power than mine cam only for sure.
Cheers,
Cheers,
TECH Junkie
Joined: Nov 2001
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From: Los Angeles
Originally Posted by 99 Black Bird T/A
The correction factors do have an effect. I have the impression it's easier to post big numbers on hot days with higher correction factors.
TECH Senior Member
Joined: Nov 2001
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I have seen 20RWHP difference corrected within one month to the next with no changes.
In the fall/winter I think the correction factor doesnt fully account for the denser cooler air. I typically dyno higher in fall than summer. (coolant temp, AF, timing everything identical)
There are all kinds of things that affect numbers. How tight you strap the car to the dyno, air pressure in tires. Where the correction sensor is located etc etc.
I always go by trap speed, tire choice, DA, gearing, raceweight and whether or not powershifting. (I run 2.0-2.5 mph higher powershifting than granny shifting) (124mph vs 121-122mph granny shifting)
In the fall/winter I think the correction factor doesnt fully account for the denser cooler air. I typically dyno higher in fall than summer. (coolant temp, AF, timing everything identical)
There are all kinds of things that affect numbers. How tight you strap the car to the dyno, air pressure in tires. Where the correction sensor is located etc etc.
I always go by trap speed, tire choice, DA, gearing, raceweight and whether or not powershifting. (I run 2.0-2.5 mph higher powershifting than granny shifting) (124mph vs 121-122mph granny shifting)
Hey Kurt, What's up man it's Carter,
Glad to see those numbers and glad to see you are pleased with the head's.Did the scratch on the exhaust seal up good? Anyway's man that is very impressive numbers for that cam through the 12 bolt...now get that sucker to the track
Later,
Carter
Glad to see those numbers and glad to see you are pleased with the head's.Did the scratch on the exhaust seal up good? Anyway's man that is very impressive numbers for that cam through the 12 bolt...now get that sucker to the track
Later,Carter
Man, I wish the numbers out in my part of the world were 20+ rwhp over SAE instead of 20+ rwhp UNDER SAE.
My 81 Camaro made 314 rwhp and 38x rwtq uncorrected and 346 rwhp and 430 rwtq SAE, and my Trans Am did 29x uncorrected and 316 SAE on a much cooler night.
My 81 Camaro made 314 rwhp and 38x rwtq uncorrected and 346 rwhp and 430 rwtq SAE, and my Trans Am did 29x uncorrected and 316 SAE on a much cooler night.
Originally Posted by Chris81
Man, I wish the numbers out in my part of the world were 20+ rwhp over SAE instead of 20+ rwhp UNDER SAE.
My 81 Camaro made 314 rwhp and 38x rwtq uncorrected and 346 rwhp and 430 rwtq SAE, and my Trans Am did 29x uncorrected and 316 SAE on a much cooler night.
My 81 Camaro made 314 rwhp and 38x rwtq uncorrected and 346 rwhp and 430 rwtq SAE, and my Trans Am did 29x uncorrected and 316 SAE on a much cooler night.
Whendid you dyno ? Anytime you dyno ona day cooler than 77 deg and with a bar higher than 29.92 + range you will have a higher actual dyno# . I know you guys in texas get good DA days .
Last edited by offaxis; Jan 10, 2004 at 02:41 PM.