Congrats on testing Dave, I am glad to see other people are testing the limits of our motors besides us There are a few things I disagree with and a few things about my car that might be unclear.

My personal G35 made 528rwhp @ 12psi on 93 octane. I drove the car for weeks on the street at 12 and 14 psi. I took the car to Willow Springs raceway with a few friends and filled it up with 100octane for added safety. The car was ran at 14psi ALL DAY. After 90+miles on the track (reset trip computer when I got there) the engine finally gave. The car was making over 550whp at this point, and I was driving the hell out of it, some where saying it seemed liked I was "trying to blow it up", which I was

If my car didn't blow at the track we were going to tune it for even higher numbers ( over 600rwhp ) and Sam felt very confident in doing so which is why I am not contesting your numbers.

What I do disagree with is how you like to call your Dyno Dynamics readings "REAL" numbers compared to a Dynojet. If anything the Dynojet's numbers should be considered "REAL" since they cannot be altered in anyway other than choosing the type of correction you would like to use.

On your Dyno Dynamics dyno you can make the numbers lower, the same, or higher than a Dynojet's readings very easily. So for you to say that your 563rwhp would be over 600rwhp on a Dynojet then you should have dyno'd it on a Dynojet. (Some people don't want to just "take your word for it" that you didn't apply any correction factors, at the end of the day only you would know the truth)

What I am getting at is there is no way for anyone to know if that car made 500whp, 560whp, or 600whp. If you want to compare numbers of the internet then a Dynojet is the BEST dyno for comparison across the internet.

Now, I do agree that the Dyno Dynamics is much easier to tune with and saves the tuner much time street tuning a car, but this does not mean that a competent tuner cannot tune a given car just as well on a Dynojet than on a Dyno Dynamics, Especially if the given tuner as been using the Dynojet for many years. Also to say that a Dynojet is not a tool tuning tool is rather inaccurate since we have been using it as a tuning tool for many years, as well as many shops for many different platforms across the country

None the less, nice job.

-George
GT Motorsports

EDIT: Here is a link to my Track day thread with video
https://my350z.com/forum/questionable-posts/250645-my-track-day-testing-results-gtm-14psi-stock-block-550whp.html

 

Nope, There was nothing wrong with my car or the tune. Just the amount of stress put on the car at the track, I doubt anyones stock engine would last at 550whp on a stock block at a full day event on a road course.

-George
GT Motorsports

 

Nice numbers Function! Nice to see some more 350's pushed to the limits.

 

This has been a very informative thread for the FI community. Thanks for the research and work put in to the limits of the engine. Gives me a nice benchmark to shot for when I am tuning on my DD as well. Big props to your staff and may your company continue to grow in two folds.

 

Hi George, I think by "real", Dave was making sure people understood that he isnt adding any DJ correction to his numbers, which some people with DD's feel the need to do. Becuase like you said, there is no way to know exactly what this car would do on a DJ, without physically taking it there on the same day.

At 19psi with C16, a stock engine at 10.3:1 CR would make far more than 560whp'ish on a DynoJet...wouldnt you agree?

To end all this debate, we are going to use shootout mode from now on. In this mod, it is IMPOSSIBLE to intentionally fudge the numbers, as the ramp rate, and all correction factors are locked out. And it also stamps the dyno as "ShootOUTMode", so people know they are true DD numbers.

 

Hey Sharif,

I am not contesting the fact that he made 563whp at 19psi on C16, that is not very difficult to do. The only problem I have is the way he post this "REAL, Not Dynojet" I take that as he is putting down Dynojet readings saying they aren't "REAL" when in fact the only readings that can be questioned are ones from Dyno Dynamics machine. (not saying his numbers are inflated, just saying he shouldn't be putting Dynojet readings, don't you agree?)

Take care,

-George
GT Motorsports

 

Well, Dave can chime in with his intentions, but I read it as a "non-DJ-corrected" number. Maybe I am wrong....since again...there is a tendancy for "some" shops to inflate their DD numbers.

 

That's how I read it also.

 

Thats how I read it too.

 

What exactly are you guys breaking? Do you have a few pics of the damage?

 

Me too........

 

This is correct. I even went to the extent of calling a DD rep to go through my system to make sure there were not any misc. correction factors outside of the norm for a DD. IE the so-called "X" factor. I actually wanted to put the car in ShootOut mode for 100% indisputable reference but we lost the motor before me could.

 

Based on my past experiance it seems to be the rods, but there is no way to completely confirm this as rod damage may occur after the piston fails. We assume it is the rods due to the holes that are generated in the sides of the blocks. I'll post up some pictures soon on the exterior. We have not torn down the motor yet.

 

Niice!!! A year later, my motor is still 100% problem free!!! ...guess I'm going to have to schedule another trip for more power!

...my Function Tuned Z...
http://i81.photobucket.com/albums/j2...2/willbur2.jpg

 

nice, the Zs are starting to get up there

 

Am I the only one who thinks that going up 4.8PSI (from 14.1 PSI to 18.9) AND going from a 93/116 mix to a pure 116 octane would yield more than 22.3whp?

 

Our boost was tapering off after 5500RPM to ~16psi. We were using the stock wastegate spring (6psi). We could have made more power but would needed to swap out the springs. The first and third charts show the boost pressure line.

 

i think that is pure badass! the ppl who put tagether the tyme and money and energy to do this only furthers my belief that when I spend the money right it will get done right!

 

op- with those 3" downpipes, did they open up the dumps or were the wastegates recircuilated back in to the exhaust?

 

What did you say?





Open Dumps FTW!