Dyno Dynamics to Dyno Jet comparison..
Originally Posted by IntenseFab
For DJ operators you have to understand what the correction factors are for and why you are correcting, I've seen people set their #s stuck to STD w/ smoothing at 5 and say "i dunno its just how it is". The truth is, it's a simple right click to change the correction factor and every DJ operator knows that STD is the highest read-out.
I honestly don't think that DJ's would be far off from DD if operators didnt correct everything.
Boosted cars create their own atmosphere, there's no need to start with a higher or lower base atmosphere. All numbers posted and shown should be UNCORRECTED, this is the true horsepower read out whether its 10-50 hp lower.
SAE, STD, DIN etc correction factors are for people in hotter, higher climates that will consistently read substantially lower, so what happened was they said "well we need to create a standard correction so anyone anywhere can apply it and have a similar read out". So when you take you're N/A car to your dyno when it's 8000ft above sea level you're not scratching your head as to why you're only making 200whp. The DJ operator can say hey well lets see what you would make at sea level, on a normal day, ok (applies SAE/STD Correction) here's 234whp backed by another 236whp.
I honestly don't think that DJ's would be far off from DD if operators didnt correct everything.
Boosted cars create their own atmosphere, there's no need to start with a higher or lower base atmosphere. All numbers posted and shown should be UNCORRECTED, this is the true horsepower read out whether its 10-50 hp lower.
SAE, STD, DIN etc correction factors are for people in hotter, higher climates that will consistently read substantially lower, so what happened was they said "well we need to create a standard correction so anyone anywhere can apply it and have a similar read out". So when you take you're N/A car to your dyno when it's 8000ft above sea level you're not scratching your head as to why you're only making 200whp. The DJ operator can say hey well lets see what you would make at sea level, on a normal day, ok (applies SAE/STD Correction) here's 234whp backed by another 236whp.
Originally Posted by taurran
Nice post.
But, I still believe if you want to claim power figures that you can't simply apply percentage corrections because, as stated, no two dynos, conditions, and operators are alike. If you want to tune on a load based dyno, do it. If you want to make claims or post "dynojet numbers", then take $50 and run the car on a Dynojet.
But, I still believe if you want to claim power figures that you can't simply apply percentage corrections because, as stated, no two dynos, conditions, and operators are alike. If you want to tune on a load based dyno, do it. If you want to make claims or post "dynojet numbers", then take $50 and run the car on a Dynojet.
+1 and yah you gotta give credit to julian because he did spend his time to make sure he has the best possible correction for his DD to compare to DJ #s... he is not claming ha has an exact formula to say its the same as a DJ# what his DD correction gives, but we can agree he did the requiered test and his numbers are a close comparison....
But as i said, that doesnt mena all DD tuners can just start applying 13% now...if they want to use a DJ correction they all should do the same thing julian did so at least its a more educated correction than rather jsut assume "oh its about 14-17% more on a DJ"
Originally Posted by MRC Motorsports
Well your the exception, you drive like a maniac and rev out to 9000 rpms.
hes not known as "PARTS MURDERER" for nothin
Last edited by IIQuickSilverII; Oct 30, 2007 at 08:14 PM.
Originally Posted by IntenseFab
I honestly don't think that DJ's would be far off from DD if operators didnt correct everything.
Boosted cars create their own atmosphere, there's no need to start with a higher or lower base atmosphere. All numbers posted and shown should be UNCORRECTED, this is the true horsepower read out whether its 10-50 hp lower.
Boosted cars create their own atmosphere, there's no need to start with a higher or lower base atmosphere. All numbers posted and shown should be UNCORRECTED, this is the true horsepower read out whether its 10-50 hp lower.
I dyno'd on a DP at 245whp bone stock. With my built motor and TT kit I ended at 510whp@14psi on the same dyno, same settings. So that's a 265whp gain and if you add the 13% or so (G35 245whp - 280hp) drivetrain loss, I should be around 575hp at the crank. Is this Correct? 
So then wouldn't a DD drivetrain loss would be much higher than the typical 15%, that's always touted?
So then wouldn't a DD drivetrain loss would be much higher than the typical 15%, that's always touted?
Last edited by BrianLG35C; Oct 31, 2007 at 09:40 AM.
Originally Posted by BrianLG35C
I dyno'd on a DP at 245whp bone stock. With my built motor and TT kit I ended at 510whp@14psi on the same dyno, same settings. So that's a 265whp gain and if you add the 13% or so (G35 245whp - 280hp) drivetrain loss, I should be around 575hp at the crank. Is this Correct?
So then wouldn't a DD drivetrain loss would be much higher than the typical 15%, that's always touted?
So then wouldn't a DD drivetrain loss would be much higher than the typical 15%, that's always touted?
If you really want to get a *ball park* figure, first add the 13% and then add whatever your drivetrain loss % is on top of that figure.
I can't believe I just said that, because this is bordering really close to the bench racing mentality in trying to calculate or compare drag times at different tracks and conditions.
It's pretty ridiculous as you can see. Like I said before, if you really want to claim "dynojet numbers", do everyone a favor and run the car on a dynojet.
Originally Posted by r0mey
i have a similar build to you brother thats why im anxious to see what you will make
Last edited by Bullitproof; Oct 31, 2007 at 05:35 PM.
Not too bad. 18psi is a lot on pump gas and IMO too excessive (Julian mentioned this earlier), you can make better power with better tuning at lower boost levels (better timing) but what do I know...
I do 578whp STD on a DJ @ 15psi for comparison
btw-those lights come on after dyno's and donuts they dont affect power.
I do 578whp STD on a DJ @ 15psi for comparison
btw-those lights come on after dyno's and donuts they dont affect power.
Originally Posted by Bullitproof
Which also means that if i were to get dyno'd at a DD, it would come out to 469 at 15psi and 498 at 18psi, right?
Originally Posted by Alberto
Only one real way to find out! As you should have learned, even DD's can read differently-the difference between my DD from Forged and DJ was 7%, the difference between Julian's DD and local DJ was 13% so you never know until you compare.
Originally Posted by Alberto
Not too bad. 18psi is a lot on pump gas and IMO too excessive (Julian mentioned this earlier), you can make better power with better tuning at lower boost levels (better timing) but what do I know...
I do 578whp STD on a DJ @ 15psi for comparison
btw-those lights come on after dyno's and donuts they dont affect power.
I do 578whp STD on a DJ @ 15psi for comparison
btw-those lights come on after dyno's and donuts they dont affect power.
But arent you running different cams? Had to go into the archives to check out your setup. you got jwt cams and are at 9 to 1 compression which is higher than my 8.5 to 1. I would expect you to make more power than me. and dont knock my tuner, he's a wizard!
Last edited by Bullitproof; Oct 31, 2007 at 07:37 PM.
Originally Posted by Bullitproof
I'm up for it. this forum for me has always been about information....good or bad. I had stated earlier that i wanted to strap the car to a DD sooner or later. seeing as the closest one is at MRC, i'll see what deal julian can drum up for me.
Originally Posted by Alberto
Not too bad. 18psi is a lot on pump gas and IMO too excessive (Julian mentioned this earlier), you can make better power with better tuning at lower boost levels (better timing) but what do I know...
I do 578whp STD on a DJ @ 15psi for comparison
btw-those lights come on after dyno's and donuts they dont affect power.
18 psi is a bit excessive on pump gas.It requires pulling alot of timing and increases EGT enourmously. I prefer the 15 psi range with some nice timing and A/F.I save the 17+ psi for higher octane gasses,especially on customers cars.
Not too bad. 18psi is a lot on pump gas and IMO too excessive (Julian mentioned this earlier), you can make better power with better tuning at lower boost levels (better timing) but what do I know...
I do 578whp STD on a DJ @ 15psi for comparison
btw-those lights come on after dyno's and donuts they dont affect power.
18 psi is a bit excessive on pump gas.It requires pulling alot of timing and increases EGT enourmously. I prefer the 15 psi range with some nice timing and A/F.I save the 17+ psi for higher octane gasses,especially on customers cars.
Originally Posted by Bullitproof
But arent you running different cams? Had to go into the archives to check out your setup. you got jwt cams and are at 9 to 1 compression which is higher than my 8.5 to 1. I would expect you to make more power than me. and dont knock my tuner, he's a wizard!
Originally Posted by MRC Motorsports
Originally Posted by Alberto
Not too bad. 18psi is a lot on pump gas and IMO too excessive (Julian mentioned this earlier), you can make better power with better tuning at lower boost levels (better timing) but what do I know...
I do 578whp STD on a DJ @ 15psi for comparison
btw-those lights come on after dyno's and donuts they dont affect power.
18 psi is a bit excessive on pump gas.It requires pulling alot of timing and increases EGT enourmously. I prefer the 15 psi range with some nice timing and A/F.I save the 17+ psi for higher octane gasses,especially on customers cars.
Not too bad. 18psi is a lot on pump gas and IMO too excessive (Julian mentioned this earlier), you can make better power with better tuning at lower boost levels (better timing) but what do I know...
I do 578whp STD on a DJ @ 15psi for comparison
btw-those lights come on after dyno's and donuts they dont affect power.
18 psi is a bit excessive on pump gas.It requires pulling alot of timing and increases EGT enourmously. I prefer the 15 psi range with some nice timing and A/F.I save the 17+ psi for higher octane gasses,especially on customers cars.
Originally Posted by MRC Motorsports
I dont think Berto was knocking your tuner at all, nor did he mean it that way. It just safer to make more power at lower PSI levels on pump gas. I generally make no more than 500DD HP on pump at 15-16 psi tops. The EGT's get to high otherwise.
I know he wasnt, i was just kidding.