Hey everyone I have the JWT set up on my track 350z with the greddy tt exhaust system and test pips. The problem I am having is that when i boost in 3rd gear the car falls on its face and then i cant go anywhere and the car wont let me rev past 2500 rpms. So then what i have to do is shut the car off and wait a couple of mins. Then when i start the car back up its fine until i boost in 3rd gear. So if anyone can give me some info that can help me figure out this problem that will be great.

 

hmmm never hear of this problem. Maybe its overboosting sending the engine into limp. thats what is sounds like.


Do your gauges read any diff in 3rd than they do in 2nd

 

Yup...sounds like limp mode due to overboosting. Are you running stock boost settings?

 

Yeap overboosting is probably the issue. When you change out the exhaust to that size and test pipes you have to address the boost increase and clamping the MAF signal somehow.

Stock boost is around 7 and when we did a car with 3" exhaust and test pipes it climbed to around 9-10, at that time we added a Unichip the owner had from pre TT kit and took care of the clamp plus tuning fuel and timing for the added boost.

 

Well see thats the thing my boost is still the same 6 psi thats all im running. The second day after i put my exhaust on thats when it fell on its face a little but nothing serous. But now everytime i boost in third gear it falls on its face and i cant go over 2500 rpm. I dont know what to do now cause Vinney ten from performace motorsports did the install 2 months ago and i cant get in touch with him. Also at idle the car sound like it as a little miss until i shut the car off for a min or so and then start it back its fine.

 

Search the fi forum I believe there is a thread about vinny openning a new shop not far from his old one.

 

The JWT has no overboost control. The MAF is draw through and so should not be seeing signal clamp. It sounds like either the car is going too rich or the plugs are fouled. Do you get a flashing check engine light or a check engine light at all? What's the ambient temps when this is happening?

 

Nope I have not gotten a check engine light at all. Its was pretty cold saturday night. I would say it was around 20 deg.

 

What forum do I search for vinny new shop captj3

 

Here is the link for the location and phone number for his new shop.
https://my350z.com/forum/showthread....ight=vinny+tin

 

Yeah i found it earlier thanks alot. I just got off the phone with vinny and he says i have to have my drive by wire re calibrated. Its normal in the 03 tracks with the JWT. Thank you everyone for your help. I will be dropping my car off on saturday

 

why don't you recalibrate it yourself? search for "throttle position learning"...

you may have a boost leak as well...there have been times when i've partially blown an IC pipe and have had limp mode issues, and no SES light.

it's def worth checking the pipes connected to the FMIC--and easy.

 

+1 for vacuum leak.....i had a small gap in my plenum as well as a bad bov and my car would either stall when revving over 5K or go limp like a 90 year old man

 

Yeah but what vinny ten is saying it can happen again so i have to send my computer to Jim wolf and he will take car of it. This had happened on one of jim wolfs cars. So there is a new update he has for it.

 

Hmmm...interesting. Could you provide more details? Does this affect specifically the '03 Z? And what exactly is causing this which requires your ECU (but not mine) to need a flash?

Thanks!

 

Check all of the hose clamps particularly around the inter-cooler and near the throttle body.

Good-luck.

M

 

Thanks alot