I had my car dynoed stock and it put out 253.4whp and 220.9 wtq SAE corrected. A little disappointing but FWIW I forgot to turn off the AC. Today, I dynoed again after adding the Greddy EvoTT and it put out 255.3whp and 224.45wtq. Not much of a gain.

I must include that these were done on two different dynos. Both were dynojets, but two different shops, and two different style dynojets.

I am going to try to go back to the first shop and dyno again with the exhaust to see what numbers I get.

All in all, I'm a little disappointed with the numbers. Torque isn't too far off of what other people were seeing, but horsepower is down at least 10-15. Any ideas, other than just lower power from the factory?

One thing worth mentioning is that in the graphs I've seen of other people I'm not sure what correction factor has been used. STD gives better numbers than SAE, and there are other corrections as well. In any event, I thought I would share to inform people of my experience and perhaps see if anyone can suggest a reason I might be down on power.

Cheers.

 

is that the 3 inch dual exhaust?

 

Sorry to hear that you are not satisfied with your numbers.

EvoTT is a great exhaust for FI. That's why I sold mine. But don't get me wrong, when I sold it locally, the guy installed it and showed me and I thought it sounded awesome. It had a nice, clean deep tone. And the tips were fascinating!

But there are better exhausts out there for the NA folks.

EDIT: The Greddy EvoTT uses 2.75" (70mm) piping.

 

Couple things to consider maybe for comparison:
conditions
engine not fully broken in
CF but even if its SAE that seems a little low
Like previously posted that is an FI exhaust

I dont know why but I thought MRC posted big gains for a turbo exhaust like the XO2 or something, correct me if Im wrong somebody.

 

Don't worry about dyno #s, particularly if they are different dynos. You're all set for FI and certainly haven't lost anything going to the evoTT. Best overall choice if FI is even a remote possibility.

 

Yes, I had read that HR motors responded well to the EvoTT despite the fact that it was designed for FI.

A '99 Camero dynoed 275whp and 303wtq immediately after me so I don't think it was a dyno problem. Perhaps others are getting "happy" dyno readings. My readings only indicate a ~16% drivetrain loss which is realistic.

Rated at 306 and dynoed at 270whp stock is only 11% loss which is a little hard to believe. I have been present for dyno runs with Nascar Cup cars and they only have ~8% drivetrain loss with much tighter clearances. I really doubt the Z has anywhere close to that efficiency.

Either way, I'm still happy with my car, it's still fun to drive. I was just hoping for something a little closer to what others have been posting. Although, I just looked over the thread posted by the guy who had 283whp with test pipes, exhaust and gears, but his correction was STD. I looked over my graphs and there was ~ 10whp difference between STD and SAE so take that for what you will. Just trying to inform fellow enthusiasts that some numbers posted by others may be a little more hopeful than realistic. :shrug:

I will probably go twin turbo after the car is paid off but for now I would like a better gain. Oh well. The engine does only have 2200 miles on it so it's barely broken it as it is. Perhaps with another couple thousand miles on it and on the same dyno it was on stock the numbers will be a better representation.

 

Well if you really want to know if your car is making the power it should be making, take it to the drag strip and post up your quarter mile time-slips.

If you really are running 20whp less than every other 07, it will be evident in the time-slips.

 

^^+1....I have a evott and my dyno results were incredible..... have you thought of other things...(gas, temp, etcx) that should be your base #don't be concerned that it is low....when I installed (w/ the fujita intakes) I felt a huge diference on the top end... I think the tt is great onm the HR.... I've seen t on the NA VQ and it really blows..

 

Did you reset your ECU before the second dyno? If you don't reset the ECU, then you've gotta drive it for a while (a week or so) for the ECU to learn the new setup.

 

those numbers seem really low?? or is that just me>?

 

it was driven for 3 weeks between dyno runs. Besides, resetting the PCM is a popular myth that actually doesn't help speed anything up. The fuel trims will relearn at the same speed regardless. I always use the same gas and the weather is compensated for with the SAE correction factor. My uncorrected number were higher but those don't account for changes in barometric pressure, temperature or humidity.

 

I think you should let your motor break in, get other comparable mods like intake and test pipes and then see what happens. By the way I had the 283hp dyno but dont have gears in my car, thats the other 07 Jon(gooey). When I dynoed the second time I got 276 SAE with I/E/tps but my motor was fully broken in at that point, and I had switched to synthetic, and the weather was pretty cold and dry that day. So its alot of factors to consider. So dont stress it tho and get to a track to check your 1/4 times and compare. That will be a better gauge as previously stated.

 

07 is rated under the new SAE HP rating system. Under the old system, the VQ35HR makes around 313hp. The HR is rated for 313ps outside the USA. A car dynoing, 270whp, would have about 14% drivetrain loss with 313 @ the crank.

TK

 

if you pull up some old posts, i dyno'd with a Nismo exhaust and fujita intakes(both i know for a fact didnt give me any extra HP over stock, probably lost some actually) and i put down 268HP and i forgot the torque. Your baselines seems very low unless you are automatic.

 

My 07 manually tranny dyno'd almost exactly what the OP did pure stock.

 

What gear did you dyno in?

 

that's wierd... Any other bone stockers dyno in the 260's range?

 

You sure you guys didn't do it in 5th gear or something and hit the speed limiter?

TK

 

i don't remember what gear my car dyno'd in. Here's the link though
https://my350z.com/forum/intake-exhaust/306993-2007-hfc-dyno-sheets-and-video-inside.html

watch the youtube vid and count the shifts, i'd do it but i'm at work and youtube is blocked.

 

4th.

TK