Alright, this may be a long shot, but hopefully somebody will be able to help me. I've been searching for about 2 hours now (not just here, but other sites also).

I recently had my car tuned and to make a long story short, the car ran perfectly fine for a little bit. Mods are in my signature. The tuner installed the infamous "NLTS" and enabled my "2-Step". I asked for the 2-step, he installed the NLTS and recommended it to me, so I figured I would give it a try.

Anyways, I've noticed some problems when at the track. It doesn't seem to do it on the street (I haven't done a hard pull since I got my speeding ticket ). I'll launch the car perfectly fine, but when I'm shifting into any gear.... the car bogs down and loses throttle, boost, and everything for about a second. I ran a 16.0 @ 92 because of the shifting issues.

At first, I thought it was spark plug blowout, so I changed the plugs.... nothing. I don't think it's fuel cut (I'm still on OEM injectors). If it was fuel cut, it would cut off before I even get a chance to shift. Everything runs fine until I put my foot on the clutch. I even tried to baby it and shift earlier (5500 or so) but it still did it.

This has been going on for about 2-3 weeks or so now. I don't drive it hard on the streets, but I've noticed it the last 2 times I've been to the drag races.

Anyone have any idea? I plan on getting the tactrix cable and datalogging it, but I am in the middle of 2 jobs right now, so my first paycheck isn't coming for another 2 weeks.

 

So is this occuring while NLTS, or just regular shifting meaning lifting off the throttle and shifting like normal?

 

I tried both, originally tried NLTS and it happened, and then I started letting off to see if that was going to make a difference, and it still did it. I think if I can get my hands on a tactrix cable and do some datalogging pulls, I can send it to my tuner and see what he thinks.

Also, not sure if this may be part of it, but when I'm staged on the line, and I'm in 2-step.... the car rolls forward very slowly, but enough to set off the red light sometimes. I know on some Camaro's they have a screw that you can adjust the clutch pedal from the inside of the car, does the Evo have this? (I havent really looked yet)

 

Also AFR's are good at WOT. Just wanted to throw that in there.

I also tried lowering the boost a little. The car was tuned when it was 97 degrees in the shop. It's been in the mid-high 70's at the track the last 2 times, so I thought it could have been something to do with boost. Doesn't seem to make any difference.

 

Ok as far as the rolling is concerned that can be fixed by adjusting the clutch pedal. Check the how-to section.

For the NLTS problem I'm not sure, mine would only do what you're describing if I was trying to shift it normally, but not while NLTS.

 

you should have immediately taken the car back to him, i mean was it doing any of this before the tune?

 

Yeah I plan on bringing it back soon but right now I'm in between 2 jobs so the money is tight

 

Did the NLTS ever really work for you? The tuner should just fix it for you, sounds like a setting in the tune to me.

 

See if you can find someone (or go back to the tuner) and have them turn off the NLTS feature.

I had the same issue (whether actually flat foot shifting or lifting to shift) and scratched my head for months trying to figure it out. Decided one day to turn off the NLTS and it never had the issue again.

 

your foot is not completely off of the clutch, therefore engaging the NLTS , try taking your foot sompletely off of the clutch after shifting and see if that fixes the problem

 

@SOEuro: I was told by someone else that this may be the problem too, but when I tried putting my foot on the floor and no where near the clutch, it still did it.

@Mysta Joe: yeah I'm going down Tuesday to have him data log it since I don't have a tactrix cable anymore. He's doing it for free, so if we figure out its a NLTS problem I'll ask him to take it off.

I'm unfamiliar with tuning really, is it a PITA to take the NLTS off? Or would it take 2 seconds? I offered to come in and pay for it but he insisted on doing a few street pulls and data logging for free.

 

2 minute job to turn off NLTS. Did it ever work for you after the tune?

 

Well if your in between jobs right now and you really want yoru car fixed you would take the time to make it happen for you. Or if money is tight like that just park the car up and wait until you get a little more cash and bump it up. If thats what your saying just be patient.

the car is acting up I would have made sure once the car is out of the shop that its ok if there is an issue just bring it back and explain whats wrong and have it checked thats all. I wouldnt mess with anything else personally becuase that would only complicate things in my honest opinion.

 

That's why I'm going down on Tuesday to have it datalogged. I don't have a Tactrix cable anymore, so I can't datalog it myself. The guy that tuned my car, is going to data log it with me on a few street pulls. He is not going to charge me for anything like I said. He's being fair about it.

I can't "make time" to fix the car if it's a tuning issue without the money. I don't understand what you were trying to say in the first paragraph. I'm not being impatient either, I was just asking for opinions in here. I'm still daily driving it, it doesn't effect the driveability until I get on the gas hard. I am pretty confident it's something in the tune, not mechanical. Anything to do with tuning is out of my hands.... I don't touch that stuff.

It did, but I honestly don't really like the NLTS. I'm not the only one that has had problems with the NLTS. I have 2 other friends.... both of them with pretty built Evo's that had NLTS and they ran into some problems with it also. They took it off and went to the caveman style shifting

 

Turning off the NLTS is quick and easy, just get the tuner to do that first and do a test pull and see if it's better. I tried logging and could not see anything odd that stood out to potentially be the cause.