OKay I am going through making a tune for my car after my turbo swap is done.

95 PCM OBD1

I have an N/A tune (from when the car last ran)
I have a tune from a member here that ran 14psi
I have a tune from a member here that ran 6psi

After opening the %change to fuel/air VS cool temp at WOT and the %change to fuel/air Vs RPM at WOT, I noticed my N/A is alot different obviously bc their mafs are was past max and they need to compensate for fuel.

What I noticed is the 2 Turbo tunes I have the Coolent % numbers are the same across the board. Now on my N/A tune the coolent temps are WAY different. Maybe its has to do with where I live and how my buddy originally tunes it? I drive the car anywhere from 40-100* outside.

Now the RPM at wot table, If I put a bigger number in there would this mean it adds fuel? And if I wanted to change it using the formula...

WOT AFR=14.7/(1+%change vs Cool/100+%Change vs RPM/100)

What numbers go into the %change vs cool and the %change vs RPM??

Thanks and this probably looks confusing lmao

Jay

 

You will only really use about 3 or 4 of the wot vs coolant temp values. 40-100 degrees ambient air temp has nothing to do with it. Dont take your car wot when its not warmed up, trust me your engine hates it.

If your n/a tune was in if you were in maf mode all the time your buddy may not have tuned your ve tables if he never put it in to speed density.

Yes increasing any of these pe numbers will increase the amount of enrichment.

There are a LOT of ways to get around problems with the stock pcm and boost but you need to know exactly how people have done it on the tunes you have. Its going to be very challenging for a first timer, you need a very good understanding of the way the pcm functions or at least the principles behind it.

 

yea it is gonna call for a fun tuning season, I sence alot of back road WOTs and watchin the wideband lol.
Just to get it close then dyno tune it.

Jay

 

There's only one good way to run 2 bar a stock LT1 PCM that any normal person can access with Tunercat and LT1_Edit. I did everything you can think of for my LT1 boosted stock PCM project as well and ended up here and yea it runs great in SD (no maf), you could save yourself some time and alot of hassle by jumping right into it! ha, really though with this method all you have to change to modify spark or fuel is a number in the VE tables in the columns that match your RPM and MAP load according to Datamaster... : https://www.camaroz28.com/forums/sho...d.php?t=560089

 

Yes I have read that thread over and over and over.....I cant find Baro reset anywhere in tuner cat, would you happen to know which file i need to download for it? I am not that confident yet jumping right to two bar. I feel I am gonna miss something. Unless I can find a base tune to compair from.

Jay

 

the Baro Reset is in the newer definition files, should be anyway.

There is alot to know tuning yourself, good point I guess the same way I learned was comparing stock vs stock then making small tweaks, once I finally started getting the hang of it is when I decided to try swapping MAP sensors and cutting everything in half to compensate for the 2bar sensor, after all that things progressed very good.

You could start with the stock setup and when you start to realize where the shortfalls come in this also means your getting the hang of it, and probably feel confident to try a 2 bar tune. My biggest concern was firt time going WOT with the new tune, as Im sure everyones concern is. I was able to start with low boost (6psi) and work my way up.

Some people (including myself) may be hesitant to give out thier tunes simply due to the "it works for me but might blow up your motor" type thing.

Asking Tunercats directly for the Definition file which includes "Baro Reset" would probably be all you need if you get to that point.

 

lol yeaaaa. I hear ya. I wouldnt stick the blam BC I am not taking someones complete tune just looking theres over and editing mine. (every motor is different lol)

Jay