Won't free rev past 3200

[Talonman86096]

Ok so like the title states my car doesn't want to free rev past around 3200 rpm's. Just sitting in neutral if I try to rev up the engine when it hits about 3200 it seems to bogg a little and just doesn't want to go any higher kinda feels like a stutter also. However the car drives perfectly fine, boosts hard, and if I am lets so coasting down a hill or just coasting in general if I take out it out of gear it will rev just fine all the way up to redline no issues. It's not like I want to be able to sit around and rev my engine but don't I know that's not supposed to be happening. Any ideas? Thanks guys.

 

[Boddie]

My car does something very similar. Only in neutral while stationary, it will not rev past 4500. Mine almost sounds like I am hitting a rev limiter or fuel cut. Have done blt, checked logger, fixed broke sensors, and more but still has the same issue. Just yesterday did a compression test and found a cylinder is very low. I suggest you do all the same to try and locate the issue.

 

[GSXtra]

That my fried is what sounds to be a stutter box or something like that. It's designed to stutter around at a certain RPM when sitting still to build boost for launches. It's disengaged after a certain speed so it can go to the red line when moving. That's the only thing I can think it could be if your car otherwise runs well

 

[Boddie]

I think they also call that a two-step launch control, but I am 92.3% certain mine does not have that; Like the OP... it otherwise seems to run fine. Was not until I started testing that I found the compression issues. May as well check about anyway. It could not hurt.

 

[Talonman86096]

Yea I agree defiantly cant hurt to check around. I have checked compression recently which was all good across the board so I don't think that's it. I'm due for a blt which I will do in the next day or so. Now this stutter box or whatever is that something that is set through the ECU?or an actual device somewhere? I have link I don't know if there is somewhere through that I can control it?

 

[Boddie]

I think it is part of the anti-lag in link or something. Not entirely sure, but it is worth looking into.

There is some explanations here.

 

[Talonman86096]

Alright I will also to take a look into that

If thats what it turns out to be I definitely need to turn that off because I'm not one thats ever really going to be launching my car .

Ok so I just hooked up to link and now I feel like a complete idiot .Now I see I have Launch Limit set at 3250 (well previous owner did). No anti lag is enabled. So basically if I want to take that off I just need to set it at max which is 7000 correct? I didnt see any option to eliminate the option but I can change where I want it. I dont really plan on launching so I assume just setting it higher would be alright.

 

[mrslow]

Alright I will also to take a look into that

If thats what it turns out to be I definitely need to turn that off because I'm not one thats ever really going to be launching my car .

Ok so I just hooked up to link and now I feel like a complete idiot .Now I see I have Launch Limit set at 3250 (well previous owner did). No anti lag is enabled. So basically if I want to take that off I just need to set it at max which is 7000 correct? I didnt see any option to eliminate the option but I can change where I want it. I dont really plan on launching so I assume just setting it higher would be alright.

Yes, just set it high enough that you won't hit it while revving at a standstill.

 

[Talonman86096]

That's what I assumed but never hurts to double check. Thanks