VORTECH Z

I have a 95 Z28 with AFR heads comp cam and Vortech T-trim car runs fine normal driving but a wot and just as it goes into boost good it starts to run lean. Also I have a Walbro 450 intank pump and 60lb injectors. Also cats program to so is there a table besides the VE tables where you can add fuel or do you have to use the MAF, so for such a long thread.

Injuneer

How are you adding the extra fuel for boost - FMU, boost referenced FPR, 2-bar MAP tune, etc.?

VORTECH Z

Well I don't have a FMU was some I could tune it in.

VORTECH Z

I have been doing some searching could it be my FPR?

David94TA

Yes, there is a Power Enrichment table that you need to modify for WOT conditions. Are you doing your own tuning?

VORTECH Z

yes I am which table is it?

VORTECH Z

Still new to the tuner cat program but any help will greatly be appreciated.

David94TA

I use LT1 Edit, so maybe someone who uses Tuner Cat will chime in. In mine, you go to "Fuel" and there is section called "Power Enrichment". You have the choice of two tables--Temp and Rpm.

I usually make changes in the "Rpm" table. When you open up the Rpm table, there are two rows of numbers. These are labeled "%Change". The top row is engine rpm starting with 400 going all the way to 6800 in 400 rpm increments. Just below that are values for each rpm block. Increasing the value of the numbers richens the mixture, decreasing the value leans it out.

If you are not tuning on a dyno, you at least need a wideband O2 sensor so that you will know how much to change at what rpm range.

VORTECH Z

Thanks David94TA I have been looking over the Cats program I don't see the PE table I am looking for unless it's called something else.

David94TA

Look up your "ECM constants" table and look at "WOT AFR vs rpm"

VORTECH Z

David94TA thanks for the help the PE table did the trick was able to get fuel a WOT, got it a little rich now but will get it pretty close soon.

VORTECH Z

What is the difference between the newer air fuel ratio gauge and the digital wide band gauge they look the same.