I have the Turbonetics kit but my Turbo went out so I bought a Garrett GT-3071R. Also I'm have a Profecb boost controller and a Apexi NEo to better manage the fuel. This problem happened only once with my Turbonetics turbo and three times with my Gt turbo.
Problem:
My air fuel works fine most of the time but sometimes when running 12psi my A/F goes up to 16:1 and that is WAY too lean. The only thing that seems to fix it is to disconnect the battery for awhile then reconnect and it works fine for anywhere from 1 day to 3 days. Any ideas?
Is my MAF maxed out?
Is my fuel pump maxed out?
Would these things cause a CEL?
Apexi says it's probably not the NEO

Help...........

 

could your injectors be maxing out? have you had it re-tuned since you put the new turbo on it?

try a different piggy back unit with a pressure sensor and a black box, or get a stand alone ems

 

My injectors could be maxing out but it is strange that a battery reset fixes it for a short period. How will a pressure sensor and black box help? Not familar with those two.

 

is this at WOT...are you adding fuel with the neo?

 

it is from 4000 - 6000 rpm , yes WOT and yes I am adding fuel with the NEO. When it works it keeps my A/F around 10.5:1

 

Im quickly coming to the conclusion that you know far and few of what things do to FI cars.

C'mon, by now you should know what the black box does. You know it dosnt make sense to run the pressure sensor AND the black box. This is atleast the 3rd thread were your recomending this to someone knowing that there not needed.

- on topic now

The black box isnt going to help you for WOT

Have you had the car re-tuned? What size injectors do you have?

 

well, if you used a greddy emanage, the pressure sensor allows you to tune off of boost, and the dezod black box lets you do partial throttle tuning. i'm not very saavy at this kind of thing, but when i get my turbo (someday sigh) i am going to definetely have these running.

www.dezod.com for the dezod black box

also, i asked paul about the apexi NEO and he didn't have anything nice to say about it, he only offers it because some customers want it.

i don't know the differences between the piggy back ecu's, and maybe you have your reasons for choosing the NEO but alot of kits use emanage.

what happened to the unichip engine management that your turbonetics kit came with? couldn't find a unichip tuner nearby?

anyway, there are two stand-alone engine management systems out now, one is the hydra ems that www.zpiracing.net has, the other is the aem standalone that dezod is developing, they are about 1700 to 2000 dollars.

 

Apexi Neo doesn't work well - get a different fuel management system.

 

It dosnt make sense though. When you part throttle boost, the pressure sensore senses boost, and adjust the AFR accordingly. The black box sees part throttle boosting and adjust the AFR accordingly.

THEY DO THE SAME THING IN A DIFFERENT WAY!

Why waste money?

 

your right, i do have a number of hole in my knowledge of forced induction, but from what i understand, the pressure sensor lets you tune from your boost readings instead of what your maf tells you, AND then the black box lets you tune air fuel ratios for partial throttle inputs. they do similar things in a different way from different data input. they sound like they would work great together.

i'll let you know how it works out down the line when i get mine!

 

I have the same injectors that came with the kit , I believe they are 550's. And i still have the unichip and no there is no one close by to tune it. I just piggy'd the NEO to add more fuel during high boost.

 

The tnetics kit come with 630cc injectors. Anytime you do something as big as a different turbo you HAVE to retune the car. Ditch the unichip and get something that someone local can tune. No way the stock turbonetics tune can handle 12 psi.

 

Yea ditch the unichip and get something else. Oh and while you're at it, sell me the unichip, I need it for my kit!

 

PM me if you want one. I'll have 2 for sale in about a week with the stock turbonetics tune on them.

 

The Unichip has been known to have problems with the board. When they were popular for the Subaru WRX a few years back, problems like this would pop up.

Now, I thought that they redesigned the Unichip and there were no more problems. Just in case, you may want to swap unichips with someone for a week or so and see if that is the problem....Just a though.

 

So you never got a tuner to re-tune the car after you put a bigger turbo and now you have problems with AFR? You dont say


Get the car retuned

 

NO, I did not put on the new turbo and not tune it. It was tuned after the turbo but like I said the problem did not pop up during the tune. A/F during the tune was around 10.5:1 ...... A day later this problem popped up again......... Tune still in place on the NEO but it does not seem to be doing ANY correction. Not sure if it's the NEO or the Unichip.

 

Hmm not sure on the Neo/Unichip combo sorry. I do hope you get it figured out though!

 

i don't think stacking 2 piggybacks together is a good idea. there going to fight each other to high heaven. pull the unichip and try with just the afc.

the NEO and the emange do the same thing for fuel. all there doing is tweaking the the maf signal to trick the ecu.

 

Basically, you have 3 computers trying to control the car....Does not sound like a good combination for success.

You need to X one of those piggy backs and have it retuned.