Jons95c36amg

Ok today was dyno day. Before my run the new Vette Z06 with intake,headers put out 410whp on Dyno Dynamics. Here is mine..Btw Dyno dynamics put about 15% less then say a typical dyno.

MB_Forever

Dyno Dynamics dyno will only read low if the operator explicitly sets conversion factors to 0%. Some (if not most) dyno dynamics dynos have an 11 to 12% correction factor to allow users to compare results with dynojet numbers.

Jons95c36amg

The guy w the Z06 said he dynoed close to 500whp on a different dyno. So it was definitely low.

Jons95c36amg

What I think is that I have a strong running stock C63. If I had it on a dynojet it would be around 390whp. My friend was also there with his 135i-intake,catless DP,meth kit,procede tune boosted to 18psi. He put out 330whp.

all8up

I put down about the same #s on a DD as well. I was on 93 oct and the car had 1500 miles.

AMS Performance

359.1 = 454 - 460.4 HP at crank @ 21-22% correction (the proper correction factor for DD). Those are strong numbers and perfectly in line with the OEM claims. Looks like you have a good strong motor from the factory.

Jons95c36amg

So can you explain why the modded Z06 put only 410whp on DD? On dynojet they put out 420+whp stock. He had intake,headers which is good for 50whp.

Jons95c36amg

Stock?

all8up

Yes at that time it was stock, it was about 70 degrees w/ 60% humidity. My friend ran his car there too and he baselined about the same.

Jons95c36amg

My friend keeps telling me my car is tuned.

themyst

with that bit of info, perhaps the dyno operator set incorrect correction levels for myself and the z06. I ran right after the z06, and Jon ran like 25 minutes later after the dyno was cooled off and reset. Who knows. That was a **** dyno and a **** event.

I need to find a dynojet and get some real numbers to compare to. If I put down 370whp on a properly dialed in dynojet, then I have some work to do on the car.

AMS Performance

DDs do dyno lower than dynojet, nobody is arguing that (so I'm not sure what your specific arguement is). Everything is exactly as it should be.

Jons95c36amg

That z06 guy had almost 500whp on another dyno He only put out 410whp on DD.

Even Money

Entirely possible. Even on the same type of dyno.

alqamzi

dyno dynamics is known as the heartbreaker. I dynoed my car when it was stock i made 378 on maha dyno. So your numbers are right on dd.

AMS Performance

Yup, that's completely normal. Especially if the Dynojet manipulated to the high side (which many are b/c its good for business although highly unrealistic/unethical). Typically differences of 5-7% more drivetrain loss can be seen on a DD dyno (15% is an extreme exaggeration). Furthermore, depending on what TYPE of modifications you have, some lend themselves better to a loading dyno versus inertia dyno (and vice versa is true). The DD numbers are the REALworld numbers, dynojet is basically just a video game and does not resemble reality at all.

To put it in perspective, I've seen Bentleys making 500+ at crank dyno in the mid 300s on DD, so thats not that bad at all. Most of the NA 55s dyno in the 260s-290s on DDs for comparison purposes (except for a few highly modded ones). So those C63 numbers are very strong and healthy.

Also, who knows, something wrong could have developed on the Corvette between the two dynos, its not uncommon for LSx engines to develop compression leaks & etc once they start getting pushed pretty hard. Way too many variables to compare apples & oranges. Don't worry about other cars, all that matters is the C63 dynoed exactly what it should (and a bit more) so those are definitely good healthy strong numbers.

Moral of the story, when it comes to dynos its important to put ones ego aside and dyno on a proper loading dyno, than to worry about what "other cars" ran (especially on other types of dynos). At the end of the day, the only real competition is with yourself. You dyno your car in order to see how much your exact car makes with additions to your specific car on that specific dyno. Its the only real way to properly gauge the performance gain on your individual car. What other cars make on other dynos on different days at different times in different parts of the world honestly should be irrelevant.

Hope that helps clarify things

c32kompressor

can alot go wrong, or alot of things make a dyno pull go wrong? i dynoed at 330whp and 327wtq with my c32 with just an intake at 83000 miles?

MB_Forever

Please note that a dyno dynamics and a mustang dyno (or any other load-bearing dyno for that matter) can indeed read much higher than dynojet. I have a thread in the W211 section where I posted my dyno charts from a Mustang dyno: I got 530+ rwhp with 100% stock car. At three different dyno dynamics machines, I dynoed 388 rwhp, 412 rwhp, and finally 445 rwhp. Dyno numbers are all over the place. Track numbers usually give you a more reliable reading.

Even Money

Trap speeds....

AMS Performance

MB_forever,

You are referring the crank power feature on the dyno dynamics dyno. Some DD shops run the crank power option (which they should not but some do). Unfortunately sometimes they don't tell you, although it becomes blatantly obvious. What's important is that you use the same exact dyno to measure % gains before & after. Its the difference that matters most, not necessarily the before or after numbers. True, track numbers do help but again even that isn't accurate as no two drag strips are identical, and weather conditions are always changing (sometimes drastically).

MB_Forever

Actually no.... I was referring to rwhp numbers not crank. Unfortunately, different operators use different settings, which by the way, applies to different types of dynos as well.

Weather conditions will vary on the track as well as on the dyno. However, I prefer using track numbers slightly over dyno numbers simply because they are real-world results. They show you how the car would perform as if it was on the street. Simulating real-world conditions on the dyno is very difficult and very expensive; it would be hard, for example, to simulate 120 mph winds, proper wheel/road friction resistance, aerodynamic drag, etc.... I was very impressed when I saw tuners come out to our private track rental and actually perform live-tuning at the track. They would data log many variables, analyze the data, adjust the tune, then run again and collect more data. I personally witnessed Terry Burger develop a tune for the BMW 335 engines that was 100% real-world track caliberated. He kept going quicker and faster with each and every pass.

Overall, I think it is much easier to get high dyno numbers than good track results. I see people claiming 550 whp on some cars and can't even break into the 11s

AMS Performance

all valid points, well said. Best way to factor out all the variables is to determine ones own specific method and stick to it as a basis of comparison.

MB_Forever

Yep.... you're right: the key is to use the same method before and after as to minimize variables. Before and after every mod, I usually try to use the same dyno, same operator, same gas, same dyno fan, same conditions, etc....

EUGENE-Taiwan

I think you have some very good numbers for a stock C63
but a +/- 15-20whp is normal it can happen on any given day actually
here is what i have in my MAC

themyst

OK so a fully modded catless C6 Z06 puts down 409whp which is far below stock, I go after him, put down 325whp in a 135i with Procede V4, downpipes, intake, methanol, C63 puts down 359whp after that, so you're saying a bone stock C63 with the examples given is not reading a bit on the high side? You're an AMS vendor, you design a well-received FMIC in our world, I am damn certain you know what the N54 platform is capable of and respect your input. Being that there was a 20-30 minute break between myself and the Z06, could the dyno have been recalibrated in between? No one knows. I was at that dyno, no RPM reading, no A/F, the dyno sheet read up to 9000 RPM, who knows what happened on that dyno.

Nothing was wrong with that Z06 as it was putting down +/- 5whp on each of his three runs. I completely understand your point of DDs reading a bit on the low side, but based on the said examples, either the dyno was recalibrated after the Z06 and 135i, or C63 on this dyno is not stock. STOCK C63's on a DYNOJET are in the 370-380 whp range, the fully modded Z06 is only +50whp on a supposedly STOCK C63? I don't think so.