i just installed my zpi stage 0 kit last week, and with one tank gone im getting 11.6 mpg. i have no cat. conv. and check engine light on for p0420, p0606 and rear o2 sensor malfuntion. stock injectors stock tune and tsudo n1 exhaust. please please help me get my mpg close to what it used to. what else do i need to to do to make my car like a factory turbo car?? thanks Corey

 

don't drive like a crazed maniac

 

Figure out a bit about your turbo (spools fully at what rpm, etc) and shift before. Don't get into boost all together would also help...

ohhh and to get the mpg like you had it...take off the turbo

 

If you want something to drive like a "factory-turbocharged" car, you probably should buy one because nothing you do to the tC will make as reliable.

Your problem is a simple one: you're trying force the ECU to do something it wasn't designed to handle, so as more air is forced into the engine, the ECU will try to compensate by dumping more fuel thru the injectors.

 

do you really expect to get same or close to same mpg on a boosted car? if you boost all the time or redline it- thats the kind of mpg you'll get.

for daily driving i just shift at 3K rpm before the turbo even starts spooling... that way you'll get decent mpg

 

Got a stage 0 on my 06 auto. The key is to keep the car out of boost only use it when you need it! I get 24 MPG with my car with the kit on it.

 

i actually got close to 33 on the highway but i keep it way out of boost, i rarely went to 0 psi .

 

If you want to go faster, fuel economy shouldn't register on your list of concerns.

 

Simple...get it tuned
I'm getting 20mpg and pushing 252whp on my TT kit, and I'm in boost ALOT!

 

8.5 psi of boost and 26 mpg FTW!

*mostly highway, lol*

 

Its all in the tuning.

 

The fact you're getting CELs may also affect your fuel economy. The ECU may try and compensate for the errors it's receiving and dump more fuel into the engine. Get your CELs cleared, get tuned, and your MPG will go up.

 

thanks for all your help guys and im not in it alot but more than i should i guess. as far as the engine light being on, do you guys not have lights on?? what is the fix for that? and a tune- can you tune the factory ecu with factory injectors? thanks again Corey!!!

 

A P0606 code is a ECU code (as in something is wrong with the actual ECU box). There is a possibility the ECU may need to be replaced. The problem may have nothing to do with the turbo kit. If you have a wide band that may shed some light. I have a feeling you are not loading the engine alot so i doubt you are at 14.7:1 AFR all the time like you normally would if everything is normal. I personally just got 28.8 MPG on a trip with my ZPI stage 1 and I went up from sea level to over 4000 feet. The only other thing I could think of is possibly something is not connected (like front o2 sensor or something else).

 

You cannot tune the stock ecu, but you do not need larger injectors. You need enginemanagement, and if you get the AEM F/IC, it should be able to get rid of your CEL depending on what your codes are.

 

SOunds like you do NOT have any O2 sensors connected and they adjust the injection to keep the air fool ratio correct. Without the sensors it runs on the rich side and you probably changed to bigger injectors which add even more fool to the engine. The second O2 sensor is expecting the CAT to change the Oxygen content in the exhaust a little from what the first O2 sensor reads and if there is no cat then that may be giving you the cel as well as the A/F ratio being way off making it worse. CHeck your tail pipe for soot or unburnt gasoline coming out.

 

okay so bigger injectors (how big??) and an engine management (any recomendations), and fix the cel lights!! thanks again and how do you turbo guys fix the rear o2 code and the p0420 code??

 

no you don't need new injectors if you're running just 6 psi. make sure your sensors are connected and get a aem f/ic that should fix things

 

I agree with nebster...you don't need bigger injectors for 6psi on a zpi kit. I recomend the AEM F/IC, just make sure you have a tuner lined up. And you might need the anti fouler trick for the rear 02 sensor.

 

sience you guys are talking about the AEM F/IC I an interested on getting that for my zpi stage 0 kit. But I cant find a turner. How do you suggest on my finding one? Is there a website I can serch or do I just need to go to proformance shops and ask around?