SwayBar

Oh my gosh is that beautiful, especially the air/fuel!!!

mspiegle

Simply amazing. Congratulations!

Louie928

Yup, numbers are something we all rely on, yet can be manipulated very easily. This dyno does have a Dynojet scale, but I didn't use it. The Dynocom tech guy told me they come by the Dynojet scale through some math workings, but basically it increases the numbers by about 3%.

The raw, uncorrected numbers for the run on the chart were 553.7 hp and 507.8 lb ft torque. Now you could use those numbers, but they wouldn't really compare to anything unless standardized for things that affect power. The main variables on making power are air temp and air pressure. There are even several "Standards" for standardizing engine power. A couple I know about is an SAE standard, and the other is from long ago when something had to be standardized for aircraft performance comparisons. So, a "Standard" day was created. That day has a temperature of 15C/59F. Sea level barometric pressure of 29.92" Hg. I think the SAE standard is similar, but uses a 20C/68F temperature. Ok, so we now can have power related to no correction to any standard, the Standard day for aircraft performance, and an SAE standard day, and probably throw in whatever Dynojet uses. This dyno gives a choice of no correction, Standard correction, or the SAE correction. I chose the "Standard" correction. Mostly because I was familiar with it, and it gave me bigger numbers.

Having went through all that, I still don't know what to say about the numbers. The raw numbers aren't comparable to anything because I'm at 1350 ft ASL, and the the engine air intake was between 90 and 97 F. The barometric presure was 29.91, so close enough to "Standard" to ignore any difference. It wasn't very humid so throw that out too. If I apply some aircraft engine power corrections for a non-standard day, I come up with even another set of numbers. Power correction for a day that's not standard, that is not 59F, or not 68F, can be found by the formula:

sq rt of 460+test temp/460+59. That is sq rt of 553/519 if you average the inlet temp to be 93F. That equals sq rt of 1.0655 or correction factor of 1.032. Apply that to the 553.7 raw hp and get 571.5hp. Just about what the chart shows. If you use the SAE standard temperature of 68F the correction factor works out to be 1.023 or 566.6hp. Next, you need the power reduction due to 1350 ft ASL where the test was done. That's another 1.046 correction factor. Then you get either 597.8 or 592.7

Conclusion is that you could reasonably say the power was 553 to 598 and have some valid basis for the number.

pmotts

I'm not sure where you got that? I think this is about where Louis thinks it will be.

SwayBar

Nonetheless, either number and in-between are simply ***-kicking; congrats on all your hard work!

pmotts

It's a GT/5 speed but he's done some work on the tranny too

Louie928

I think Shane was referring to an email I sent to someone few days ago when I was at 50% throttle and was seeing something like 478hp.I thought at the time, I may be able to hit 600. I think 80% gave me 530, but the last 20% was only good for 40.

pmotts

When do you plan on supercharging it?

Your roads are going to seem much smaller than they used to

pmotts

This will get you well over the 600 whp mark

http://www.turbonator.com/index.html?id=adWords1

hacker-pschorr

Louie,
Thanks for the explanation - this is a side of dyno tuning many are not aware of or never see. A lot of dyno shops will simply hand out the numbers they want, not really explain anything (I know of one like that) or the “standard” dynojet numbers.

This is why if you are using a dyno to tune your car – it is very important to stick with the same dyno. Something you never have to deal with anymore

AO

Holy mother of all that is good! That's some serious freaking power!

Fabio421

Now you will actually NEED those steam rollers on the back of your car. Nice numbers.

Fastest928

Louis - You are very welcome.......10 years of carefully planned R&D does pay off....glad you are pleased with the result.

Remember, real life starts at:

600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600

Darn fingers stuck....dont let it happen to your foot!

Louie928

I'd need 8 of them at $70ea. That's almost enough money to do something with.

mark kibort

supercharged??? you were referencing "pulleys"

If its the tomas /Ott design, do you have to cut holes in the hood for the intake?

by the way, if that was in a race car, you could shift at 4000rpm and have a car as fast as the holbert car. (average 320rwhp gear to gear!)

extremely impressive.

Mk