On the Auto trans, UpRev tuning has not yet figured out how to remove the speed governor. Same issue occurred when tuning my car. In 4 gear, the car hits the speed governor (~140mph) before reaching redline... So true dyno number are not really being reflected. Or atleast that's what happened with my car.

My 3rd gear dyno reflected 298whp and when my tuner threw 4th the car bogs and true numbers can not be recorded. My tuner estimates my car being somewhere around 310whp even though my dyno sheet only reflects 298...

OP, you might be having the same issue as I had... Did the Mac try to dyno in 3rd or 4th?

 

If that's the case, then you're not getting any tuning on that top end. They need to be doing pulls in a gear where they can go all the way through to redline.

 

You just can't dyno it... You are still able to tune correctly with timing tables and A/F ratio on the UpRev software. I've had no problems with my tune, and my car was tune all the way to redline in 3rd gear.. Once you shift to 4th gear on the dyno the speed is hitting the governor before it hits redline causing the car and dyno chart to bog down.

I know UpRev was working on this issue, but don't think they've completed it yet.

 

I dynoed in 3rd 4th and 5th gears on my 6mt. All were close together.

 

Doing that is the same as just blindly tuning. Drop down a gear, and get some pulls in, or you do not have a tune proven to be safe for at least a few pulls. The dyno is a tuning tool. Do you wash your car if you're missing the detergent? It's still a wash...

Worse comes to worst, if 3rd gear winds up too quickly on the dyno, go do some pulls on the freeway, and log it, and then tune based on that. Either way, its better to have a lower load pull than no pulls at all.

 

^ I think SpecialtyZ's tuning ability and reputation speaks for itself... I'm not worried inthe least bit. Maybe do some research and see what kinds of cars they tune... My tuner called both Sam @ GTM and Kyle @ Stillen while tuning my car to verify they were doing it the same way... Both parties confirmed! I would hardly call it "blind tuning"...

 

Yes, MAC's tuner Nick told me about this before I even asked the question. It has something to do with the Uprev map not being complete for 4th gear for the Auto Tranny controller. It is not an issue for any of the other gears. He did say that he cleared out the top speed limit of 155 that was in the ECU. He is like me, he hates that motherhood crap they throw in. Because of this they also did one pull in 3rd yesterday that got 390 HP, 302 ft-lbs torque. I have posted that run here and you can see that it goes to the redline. I did not use it for my comparision as the baseline run was done in 4th gear and I felt like that would be cheating.

While I have a minute I will give you all my first driving impression. Right now my face hurts from the huge smile that I have! My first quick test drive from the shop was done in D auto mode. Just driving around normally the car felt very smooth, shifts were really smooth and not harsh. To tell you the truth, in normal surface street driving with traffic you cant really tell much difference from stock. The car is still very refined. My wife won't even be able to tell the difference if I am careful while driving her around! But I have to be carful because if you put your foot in it, it really responds, even in D Mode.

I drove the car from MAC on the highway in DS auto mode for the aprox. 35 mile trip from Parker to Broomfield. DS Auto definitely shifts more solidly than D and keeps the RPMs at a higher level just crusing around. The car drove excellent on the highway.

After dropping off my Trailblazer full of OEM parts at home, my buddy hopped in with me and we took off down some back streets in DS Manual mode. I got on the car from a stop light through 2nd gear and just into third and it was awesome. It pulled really hard and kept pulling harder up through the rev range. It is still not a C6 vette like car off the line from idle but once you get up around 2K it really kicks in and builds from there. In DS Manual the transmission shifts were really crisp and quick, definitely not luxury style. This first romp was done with the VDC on and it was going nuts everytime the tires started to cut loose LOL! At the next light I turned off the VDC and the results were even better without its intrusion at every little wheel slip.

Needless to say, my first impression if very good and I am extremely happy so far! DOMO

 

I agree with Graphite. Nick spent time on the phone discussing this with Uprev and he had no problems with it. I am by no means a tuner and I am sure that you could get answers from any of the good ones on this issue or from Uprev for that matter.

 

Oh yeah I forgot about that.. My tuner Seb spent time on the phone with UpRev as well and even sent them my ROM and dynologs. They said all is normal. Thanks for verifying my previous statement Dal. And I'm glad you're enjoying it so far. Sound like you're having fun!

 

Is your car idling good? Mine is possessed, once in awhile it'll just jumps around and stalls out lol

 

This is what I did. I took it on the interstate and did pulls on it in certain gears.

 

And tell me, how many FI VQ37VHR has SpecialtyZ done? I am aware of their reputation, but they're treading on unfamiliar territory when it comes to this engine and FI. It's not like they've already done 20 of these.

In your case, all you have are bolt-ons. There's not exactly a whole lot to mess up. You have to have a totally FUBAR map to damage your engine with just breathers. FI is a different story.

If they're that sure of their work, demand a guarantee from them. I'll put money down that they won't put a guarantee that the engine will not blow.

Past performance is not a guarantee of future results. Plenty of shops have gone down with great past performance.

 

Its idling really nice and it sounds great with the Stillen exhaust. That exhaust is just what I wanted in terms of sound. It has the close to the same tone and sound as the stock setup but slightly louder and maybe a bit deeper at idle and comes alive nicely when I get put my foot in it. I didn't want anything really loud even if it sounded great as far as tone.

 

You may be right that they have not worked on as many VQ37VHR motor as maybe some like GTM... or even Stillen... That is why we called Stillen, GTM, and UpRev to verify that all is normal.

I would far from call it unfamiliar territory as they have work numerous VQ35 motors in the past, both NA and FI. You right that FI does put more strain on the motor, but that's common sense. Their main focus of course being the 300zTT, so I trust they know what they're doing. My tuner has both his own 300zTT and just recently purchased and installed/tune his own GTM 370zTT using UpRev software. I have complete faith that my car is running just fine, and trust my tuners expertise.

.... Sorry to thread jack OP, but I thought this information would be important to you being that you also have the same 5AT as I do....

 

The VG and VQ are completely different engines. I'm sure you're familiar with how different a VQ37VHR is from a VQ35DE. Imagine the difference between a VQ and a VG....

Tuning a car to be okay for the occasional street pull or a run at the drag strip is different from tuning a car to be reliable under all conditions and all circumstances. I want factory reliability. That means a car that can run reliably whether its -20F outside or 115F outside. Will the car see those extremes? Probably not, but knowing that it can handle all that will make me feel better.