UpRev ECU tune results for Semtex's Z
 

Okay guys, I just got back from having my car dyno-tuned by Sharif over at Forged Performance. First off, I'd like to say a big thank you to Sharif for spending so much time tuning my car today -- he spent a little over 4 hours and did like 30 pulls getting the most he could out of my car. :tiphat:

So here are the results:

http://i618.photobucket.com/albums/t...Tune102809.jpg

With A/F ratios:
http://i618.photobucket.com/albums/t...e102809_AF.jpg

Baseline: 311.9. Final number: 318.1 Net gain: 6.2whp

Needless to say, I'm a little underwhelmed. Sharif's theory is that my car's stock tune was pretty stout to begin with, hence the gains to be had via tuning may be comparatively small. It actually makes sense. Those of you who have been following my mods and my gains know that I've been getting dyno numbers that have been somewhat higher than most. That has led some to refer to my car as a factory freak. (And it's also led some douches to question the veracity of my numbers.) Well, maybe my ECU tune results bear out the 'factory freak' theory. Maybe my car really is/was a factor freak in that my ECU came from the factory unusually mod-friendly. It would account for the wide gaps between my numbers and some of the others I've observed. Nissan does ship the Z out with many different ROMs, after all. If others get large gains from ECU tuning while I get a small one, it evens everything up and the universe makes sense again, for all of us.

One other thing that may be coming into play is heat soak. 30 pulls, give or take a couple, folks. That's a lot of time on the dyno. Sharif actually shut things down for a half hour at one point to just let the car cool, and when he did the next run, it immediately came in 4whp higher. So my point is that my gain from this may actually be understated.

I will say this -- when I drove home, my car felt significantly quicker. When I hit the throttle, my thought was "there's no way I only gained 6."

SO . . . I'm going to schedule a baseline run over at a local shop that has a DynoJet. My last DynoJet run at that same shop yielded 330whp. We'll see what I make on their DynoJet now. I'll update this thread when I get the DynoJet results in.

(As always, please remember to rep if you found this info useful. ;))

Those are some very strong numbers on Sharif's dyno.. no matter what anyone says! Congrats!

Well done Sem!

In for the dynojet results, and as I said in your journal, your car has done great with just bolt ons so a tune might just be scraping out those few extra HP. But glad to know you are feeling some difference, makes spending the money easier. :)

Thanks for being patient while I continued punching away at your car. Your car came in with a very respectable OEM tune, so I knew it would be a challenge to extra anymore power from the engine. I can look like a hero, if the OEM tune is completely out of whack...but your's was just about spot on. :)

The next highest 370Z I have tuned made right at 300whp so you definately have a very strong 370Z. Hope to see you at Road Atlanta next month.

i guess this explains the way your car has responded to mods. i know my friend got tuned at uprev while i was watching and only gained 10hp with every bolt on you can get (minus headers) on a vq35de. the tuner said his car was already running about as good as it was going to get. and that gains seem to fluctuate depending on how the car was setup from the factory

thats pretty amazing on the Forged dyno! Any plans to drag it?

Nope, not any time soon at least.

FANTASTIC job Ben!
 

Great job Semtex! You DO have a factory freak! :icon17: Numbers looks great. We (forum members) really do appreciate your dedication for the 370Z community. Big thanks to Sharif as well for his time and energy! :tup:

Very respectable numbers indeed, especially for dyno dynamics. Had a feeling the tune wouldn't squeeze out too much more from your car, but it probably made it feel more responsive.

still awesome numbers regardless. 318 on the heartbreaker is nothing to worry about.

320whp out of an NA V6 on a dyno dynamics is amazing semtex, nothing to sneeze at. I'm going to get tuned on the same MustangDyne Dyno I got 310whp (HPLogic) on. According to your theory I should only pick up a few hp.. maximum maybe 10whp?

I think you have the strongest N/A car on the boards, congrats...for now. Don't pop the champ till Sat ;)

Wish I still had my HFC for this high horsepower competition lol. I get mine done tomorrow and will update then. Only problem is I also will be getting my G3 installed also and haven't had a baseline on the dyno at UpRev. I did 274.8 or something like that on a DD at EngineLogics in Houston with just the FI exhaust and stock everything else including cats so hopefully this will be a bit better with the cooler weather helping even more !

6hp is still quite respectable!

The peak hp gain shouldn't be our biggest concern here anyway, it's what was gained THROUGHOUT the rev range. I'd be interested to see the before and after graph's superimposed on each other cos I bet the reason the car feels like its got more than 6hp is because lower down in the rev range it has. Even if there were zero increase in peak hp but bigger gains throughout the rest of it i'd be stoked!

Oops, sorry my bad - the dyno graphs didn't show up on the computer at work and have just had a gander at them at home. Looks like you've gained a heap of torque below 3250rpms, that alone is worth getting the tune done.

In for updates.

I agree! It looks like he gained that torque back from the Stillen header install.

Hmm...I'm not 100% sure on the low-end torque gain. From the graph, it kinda looks like Sharif went WOT at an earlier rpm on the two post-tune runs than he did on the baseline run. About 500 rpm earlier, actually. That alone might account for the higher torque at 3000 rpm; the engine was simply spooled up already at that point. On the other hand, a real gain in low-end torque would account for my butt-dyno impressions.

I am sure you have better response from more aggressive throttle mapping...thats probably why it seems like he went WOT earlier.

Semtex: Did you guys talk about that 8,000RPM limit at all? Advised against it?

He bumped it up to 8000, said I can use it at my discretion. He didn't run all the way to 8000 on the dyno though, I'm noticing.

Do you think there might have been more power to be had had he gone up to 8000 RPMS?

if the torque # stayed the same and didn't fall off, hp would go up yes

Torque is falling off near the end of the run though, so I doubt it would have benefited too much from running it into the 8k redline. I think they were wise and decided to leave the top end a little tame in order to increase longevity.

DynoJet run scheduled for 1pm ET tomorrow (Friday). Will post results as soon as I get them.

He didn't want to melt the engine, felt that could be left up to you! :eek:

I think Phimosis actually has the highest numbers on the board for an NA car right now -- 343whp. http://www.the370z.com/tuning/4594-i...o-results.html

343whp = :drool:

Just looked at his dyno graph...he removed the mufflers and was getting over 300whp stock? Sounds like an awfully high baseline to start with, all subsequent #'s suspect? Sorry if this has been rehashed before, I realize it's an old thread.

Right . . . I'm not all that familiar with the dyno he did his tuning on, and I don't really want to get into a debate about the 'worthiness' of his numbers. Threads like that don't typically end well, people get bent out of shape, etc. :rolleyes:

I'm just pointing out that there are other NA cars on this forum posting good numbers. Let's leave it at that.

How did Sharif up the rev limiter? From what I understand from reading on here and talking to the guys at UpRev, you can't do that?

From watching my two buddy's dyno pulls with their Z's, they all shut down at around 7500 rpm.

We don't touch throttle mapping on the VHR motors. They already do WOT from a dead stop.

You can raise the rev limiter, we don't suggest it. More so on the VHR motors. You don't just buy parts from the corner store to rebuild those heads. Nissan only sells the heads as a complete assembly and they are way out of line considering what the retail on the entire car is.

If you want to raise the rev limit to gain more power on the VQ motors, just do yourself the favor and have cash available to rebuild the motor when it grenades. As long as you understand that, the VHR motor makes power till well over 8k rpm.

awesome results. thanks for always being the first to get **** done on this place!! soo was is there a speed limiter? i didnt think there was.

Hey Sharif...Are you talking about my tune being the next highest? I want numbers like SEMTEX!!!:icon18: We basically have the same setup in terms of bolt ons, etc. Why the big difference? Just giving you a hard time, but I'm curious. Is it because he has a Blue Z??? :p

For those reading this thread...below is my chart from Forged.

http://www.the370z.com/members/myfir...o-power-af.jpg

With AF

http://www.the370z.com/members/myfir...o-power-af.jpg

Does anyone know if these are SAE corrected numbers?

Good to see some results finally. Its going to be hard to justify spending $1100 to get the software and dyno tune for 6HP though....

Curious to see the results of a e-tune compared to the dyno tune.

You posted the same graph twice. Both are AF. I think you meant to post the first one as the one showing hp and torque, right?

SEMTEX: Your'e right. I posted the same graph twice. Opps.. :shakes head: Here's the other graph. What's your thoughts?

http://www.the370z.com/members/myfir...-power-trq.jpg

My thoughts are . . . ugh . . I'm speechless right now. I'm about to post some updated info in a few mins to this thread. You'll see why I'm speechless.

Problems
 

Okay folks, all is not well. Two things are going on.

First, since getting the tune done, my car is doing something rather strange on cold starts. I start the car, wait my normal 30 seconds for everything to warm up, and when I slip it into 1st and tip the throttle in, there's like this weird dead spot. Gas pedal goes down a little, I start to feather the clutch in (same thing I've done a million times before), and nothing. The rpms just kinda don't go up, then all of a sudden, WHAM, the rpms jump up to where they ought to be and I go lurching forward like I've never driven stick before. But it only happens on cold starts, and goes away as soon as the car has warmed up a little more. Like by the time I get out of my neighborhood and make it to the first set of lights a half-mile from my subdivision, the problem is gone. I can launch as smoothly as always. No dead spot, no lag effect.

The first time this happened was yesterday morning when I left to go to the gym. I thought maybe it was my imagination or maybe it was human error on my part. But this morning, it did the same thing. It even did it when I was done with my workout and left the gym to come back home (car sat for about 2 hours). Something is f'd up. The driveability of my car has been compromised.

Okay, the second thing going on is this. I just got back from my DynoJet pulls. I have LOST approx. 15whp since my last DynoJet pull on the same DynoJet! Check it out. RunFiles 003 and 005 below are from today. RunFile 010 is from back in May.

http://i618.photobucket.com/albums/t...Jet_103009.jpg

I know, I know . . . different pulls on different days, months apart, right? But look at the run conditions:

http://i618.photobucket.com/albums/t...t_103009_b.jpg

The green and yellow lines are from today. The blue one is from May. It was cooler today than it was in May. Humidity is higher today than in May, but the correction factors should compensate for that.

Take these two things together -- the weird dead spot on cold start, plus the bizarre dyno results, and I think I'm being fair in saying that something ain't right!

I haven't been able to talk to Sharif yet, so I'm not sure what the next steps are. But right now, I'm about ready to have him flash my stock tune back in. This is not the desired result.