Nissan 370Z Forum - UpRev ECU tune results for Semtex's Z

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- - UpRev ECU tune results for Semtex's Z (http://www.the370z.com/tuning/10654-uprev-ecu-tune-results-semtexs-z.html)

Quote:

Originally Posted by jpit (Post 259370)

One of the things that my Uprev tuner did was to give me five different maps controlled by the cruise control buttons: performance, economy, stock, valet, and theft. It is pretty easy to determine if there is a problem with the tune.

Yeah I didn't get alternate maps. I asked about those and Sharif said he really only does that for turbo'd cars. Zeto -- no CELs. Everything appears normal.

330rwhp on a dynojet sounds way off. Like it was out of calibration. No way your car would do that. But the other numbers sound right compared to Forged dyno. That is normal. I think your car is fine.

Quote:

Originally Posted by semtex (Post 259359)

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.

I'm making 318 on Forged's Dyno Dynamics and only 316 on a DynoJet and you think that sounds right? :icon14:

In any case, dyno numbers aren't my main concern right now. That dead spot needs to be addressed. I'm not sacrificing the driveability of my car for a piddly 6hp gain.

Quote:

Originally Posted by semtex (Post 259383)

I was thinking the 301 dyno that guy posted. Ugg. Sorry. Then yes that sounds right for 330rwhp.

What was the smothing on that dyno jet graph?

Quote:

Originally Posted by John@Z1 (Post 259394)

What was the smothing on that dyno jet graph?

It's pulling alot of timing. Did you get some really bad gas? At the moment we are facing the cold start issue. But we will be taking care of our guys for free. Call Sharif and tell him the issues, I'm sure he'll take care of it.

Quote:

Originally Posted by John@Z1 (Post 259442)

Shell V-Power 93 octane. That's all I ever fill up with. So you guys are seeing the cold start issue as well? Good to know I'm not alone! Thanks John.

Quote:

Originally Posted by semtex (Post 259451)

Shell V-Power 93 octane. That's all I ever fill up with. So you guys are seeing the cold start issue as well? Good to know I'm not alone! Thanks John.

No prob man I will keep you updated.

OK This is making me rethink my tune for tomorrow...

Quote:

Originally Posted by RCZ (Post 259509)

OK This is making me rethink my tune for tomorrow...

I certainly wouldn't until they get to the bottom of the issue.

I wonder just how common the cold start problem is. Like I wonder if everyone who's had the UpRev tune so far is experiencing this. Or if it's just a few of us.

Quote:

Originally Posted by semtex (Post 259559)

I wonder just how common the cold start problem is. Like I wonder if everyone who's had the UpRev tune so far is experiencing this. Or if it's just a few of us.

SEMTEX...I'll try the same thing tomorrow morning and let you know what develops. Stand by for more info.

Back to my graph, I was actually disappointed. Am I being too critical or was the results acceptable?

Quote:

Originally Posted by myfirstz (Post 260132)

Honestly, I don't know. I can understand why you'd be disappointed. You have the same mods as me, right? Plus you have the JWT flywheel, which I would think would give you even more power at the wheels. I think maybe you should ask Sharif what his thoughts are. But at the same time, 302whp on Sharif's dyno is nothing to sneeze at either. For perspective, I was with Bullitt5897 when he did his bone stock baseline on Sharif's dyno. His car is also 6MT like ours, and he only made 254whp.

Hope this helps you with the "cold starts" and having a tune.

I have no tune and zero mods.

Every now and again i start my car like normal and the mother beep LURCHES foward. Then with out the foot off the gas, the car starts racing foward like im pushing down hard so i have to shift it to second to get it to stop doing that.

Then a new thing happened, i lurched foward and started to race, then it totaly stops like it stop recieving gas, then apply alot of gas again jerk me foward, then stop applying gas and let it slow down, apply alot of gas and lurch me foward again. All while my foot was off the gas, clutch and break. If any of you was to watch me from outside the car it would look like a novice is just learning the clutch and pushing it in and out while foot on the gas.

This does not happen all the time, but i know to let the car sit for like 3-5 minutes before driving.

Hope this info helps those who are fearful the tune is causing the problem.

ps at like 33 degree's c, the z feels monsterously powerful.