Hi all,

I’ve been running my APS TT equipped car with my stock exhaust and Kinetix cats for about 10,000 miles without any issue whatsoever (on a stock block). I usually boost around 8-8.5psi, with 11.9-12.2 wideband O2 and a max EGT of 850C (1550F). That seems reasonable.

But I just installed the APS 2-1/2” TD exhaust with Labree resonated testpipes last night. This morning, on a short WOT run to see how it was running, I saw boost up to 11.6psi and mid-12s wideband O2 with up to 950C (1750F) EGT. I immediatly let off since it is clear that I need a retune to make it richer, which I was expecting anyway (I have an appointment with my tuner tomorrow). But is it normal that I would gain 3psi+ of boost just like that? Isn’t the Unichip piggy-back and boost selenoids/wastegates controlling the out-of-the-box tune to around 8psi?

Also, can anyone confirm if the base idle speed can be adjusted using the Unichip?

BTW, the added power feels great and the car is hard to control now. But I will not go WOT before I get the retune tomorrow.

Thanks a lot!

 

The increase in boost is expected. You releaved a lot of backpressure when you installed the new test pipes and catback. The unichip isn't controlling boost to 8 psi per say. It is using a duty cycle for the boost solenoid and now that you have releave the backpressure, you are making it much easier for the turbos to make boost. After the retune you should be all set.

The unichip doesn't allow for idle adjustment, but your dealer should be able to raise it for reasonable price.

 

Thanks Zivman. So I should set it back down to around 8-9psi I gather...

The dealership tried to increase the idle speed but did not succeed. I think that's because it's a 2004.5 ..

Later,

 

you mean 850 degrees celcius?

 

The dealer should be able to increase the idle on every model yr. Look into a datalogger/code reader called cipher. It can adjust idle.

You can have them tune it to whatever you like. If you want 8 psi, do that, if you want 9, have them tune to that.

 

Yes, of course. Sorry about that, I am correcting my original message... .Thanks!

BTW, my EGT sensor is right on the exhaust manifold before the LHS turbo, 2-3 inches from the head, so it should be pretty precise...

Later,

 

Good to hear, thank again for you help, I appreciate it.

 

It might not be as bad as I initially thought. I did a WOT run in 4th gear and logged it. Here are the results: Thoughts?

 

I stopped by my dealership before coming from work. He has no idea what that Cipher tool is about, never heard of it. He tried again to raise the idle using the same Nissan tool as he used last year, but it didn't increase it, it simply has no effect even though the tool says it increases it. He will look into this with the Nissan tech group.

Later,

 

Your AFR seems to be what you had previously before the boost spikes. Either way you need to retune and get your AFR in the 11's all the way through....

How does the APS exhaust sound with the Labree resonated pipes? Loud? Impressions?

 

My Nissan dealer couldn't do it either for some reason...

 

The Cipher tool is a consumer diagnostic tool that does many of things that the $6000 Consult tool can do. Idle cannot be increased beyond 900rpm via either method. On the ULEV II cars, the idle cannot be dialed in via ECU diagnostic tools. I havent used the Cipher, so I am not sure if they figured out how to trick the ECU into raising the idle on the ULEV engines. But in order to gain ULEVII status, one of the requirments is that idle control must be disabled. The stock ECU is designed to target 650rpm+/-50rpm, and that is that.

Hope that helps.

 

Man, I love this board. Thanks to all. I'll write up a message with my impressions of the testpipes/exhaust a little later and post it in the Exhaust section. I'll take some videos too and post them this weekend.

Thanks again,

 

I have an 04.5 and had my idle raised via a technosquare reflash.

 

well when i changed from my stock exhaust to the dual 3 inch on my greddy TT i only saw a 1 psi increase and that was only sometimes

 

Two things:
1.) are you running cats?
2.) you have it labeled as a custom dual setup? If so, flow 'may' not be as good as you expect.

 

His exhaust was made by the same muffler shop that did my custom 3". I am using the same HKS TI muffler as he is. I am hitting full boost at 2800 rpms with the same greddy tt kit so I would say the exhaust flows pretty well.

 

Did you ever do a review on the pipes and exhaust? I'm wanting to know if it is very raspy still?

 

on a TT setup, there is no rasp. The turbos more than muffle and control any rasp.

 

Crap, I forgot he was TT for some reason even though that is what the thread is about..

Nevermind...don't really need the review anymore