So my car has run fine for the past 3 weeks after my vortech was installed. On 9/8/2008 I had 3 dyno runs all showing 12.5, 11.9 and 11.7 AFR at max. I've driven on it very hard in the past and on my PLX Wideband I've never shown an AFR above 11.6 or 11.7 at WOT.

Yesterday I took my car into Fastlane Inc. in Houston, TX for my unichip tune and on his baseline run I all of a sudden ran upwards of 14 AFR!!!

So he goes about messing around with it and beginning to tune in hopes of getting it to richen up but obviously something else is wrong.

With the knowledge that even those 3 dyno runs on 9/8/2008 were running my injectors to around 90% I decided to have deatschwerks overnight me some 440cc injectors.

Now I'm waiting for them to come in and have them installed today.

I suspect that a vacuum line is leaking somewhere when it got loaded up on his dyno either in the way he senses boost or perhaps by getting bumped or nicked of the vacuum line that goes from the bypassvalve to the FMU.

I know others have had similar issues in the past with an FMU style setup.

Could you please let me know how you all figured out what was wrong?

I'm thinking that while hooking it up to his dyno a boost gauge

 

verified that all the FMU vacuum lines are snug and tight.

 

I had that happen, but I cleaned my MAF and reset the ECU and its running perfect

 

^ really what was wrong with it?

 

allright!!! I think we figured it out!!!

Well my tuner didn't know that the unichip actually turns on the auxiliary fuel pump so that's why he was running otu of fuel. Now after talking with unichip, another tuner, and vortech we've been able to figure out how.

I went ahead and had my injectors installed anyways b/c frankly it's safer to have bigger ones since the stock ones were running at 93% max (although just waaay up top and just for a second)

anyways so now he's squeezing me in today and we're pushing ahead.

I'll let you guys know the results.

 

SUCCESS!!!!!!!!!!!

So we figured it out. If any unichip tuner asks then it is under "OPTION 5" on their tuning software.

We got the inline fuel pump on and now we're ROCKIN'!!!

We've got air fuels down at 11.3 all across now and we're working up. Our goal is to set it at 11.5 across the powerband and then work on timing.

I'll update once we're done.

 

results are in: the final pull didn't read tq for some reason but the pull just prior made 342rwhp with 298rwtq. This is on a dynojet if any are wondering.

The final pull made 355 rwhp and unknown torque but I assume it's around the same. The AFRs were nice and rich at 11.5 throughout the powerband.

Before my tune today my car had been dynoed 2 other times, once making high of 322 rwhp and 287 lbft and the other making 314 rwhp and 295 lbft of tq. This was on the stock vortech tune. The problem though was that the stock vortech tune was creeping up after 6000RPM and the factory injectors were being maxed out at 93% according to a cipher cable reading the pulse width.

I don't have the sheets with me right now but I'll have them hopefully tomorrow for you alll.



Overall I'm quite happy. My tuner was very reasonable with the charges considering it was a learning experience for both of us since he'd never tuned a vortech g35 revup with the unichip before. It took some time to get the activation of the inline auxiliary fuel pump but once that was figured out he got it done without too much trouble. He spent 2 afternoons solid working on this and charged not even 20% of that time.

Oh and the modifications to the car are as follows:
'05 G35 Coupe 6MT REVUP Premium Package w/ Navi

Vortech Full Kit w/ FMU and Auxiliary fuel pump on the stock 8lb pulley and the UniChip that comes with it

Nismo Headers
Nismo "Weldina" Cat-Back Exhaust
Nismo Low Temperature Thermostat
440cc Deatschwerks Injectors
Non-Revup Lower Plenum
MD 5/16" Plenum Spacer
Stock Cats

Otherwise the only other performance modifications on the car are:
Nismo 19" LMGT4 wheels
Bridgetsone Potenza S-03 Pole Position II Tires F275/35/19 and R245/35/19
Nismo Sway Bars

I forgot to thank a lot of people.

First off thanks to 4Shizzil for all the pep talks and all the advice and showing me that the unichip can be taken advantage of under the right hands. I've bothered that poor guy tons of times at all hours of teh day and night.

Also thanks to Vortech for giving us as much information as they could to get this tune going and turning on that aux fuel pump.

JE Imports (The owner there was a big help in understanding the aux fuel pump as well)

Tony, both Mikes, and the whole Unichip team.

Deatschwerks for overnighting me their quality injectors.

Southwest Infiniti and West Infiniti for installing the injectors and tightening belts/checking everything out since I had no garage and no tools to get any work done here in Houston. (Especially the service advisors Cal and Josh from the two dealerships respectively) They treated me right and didn't overcharge me whatsoever. Nothing quite as quality as dealership work.

My good friends and companions from Lubbock, TX, Matt the superstar military engineer and experienced mechanic for installing everything perfect the first time and GamblerZ who was kind enough to let me use his guy and his garage.

 

oh shoot I forgot to thank Jeremy Tibbs from PF for all his advice and quality time he spent with me. I ended up ordering Deatschwerks injectors because of him.

also, thanks to Paul at Advanced Race Technology for taking care of me all those times when I changed my order about a bajillion times to get me the to the full kit firstthen to the V3 next.