its not difficult, its just like carb tuning...if you have access to a wideband and a dyno, then you just look at AFR and tune your ve tables according to that.

 

I was thinking this was the solution, but I didn't know you had to rescale the MAP table. I suppose the 2 bar MAPs are still 1-5V? So all you have to do is scale down the MAP fueling table by 2? For example, where it shows 25KPA is where it really should be 50KPA fueling? My car is currently tuned with the MAP table (naturally aspirated) - if I put a 2 bar MAP in and re-mapped the table, it would run exactly as it would before? Makes plenty of sense. Or maybe it wouldn't be perfect as I think the VE table would come into play...

-Alex

 

Jeff Creech flew out to CA and dyno tuned my car on a wideband O2 setup

 

you got it...the only problem with this is you loose some resolution on that table...but i honestly dont know how big a deal that is

 

well i would use the the MS as a piggyback also... and i think i would do like Perish did on his turbo ls1 truck. Im going to let the pcm control the spark and gauges and whatnot, and have megasquirt control injectors. You foresee any problems doing this?

 

I was planning on going with the factory PCM with my '95, but I feel that there is too much extra stuff by the time I run a LTCC, MAF Eliminator, Versafueler, etc. like was mentioned earlier. For those reasons I'm just getting a BS3 and getting it over with.

I'm hoping it will save lots of hassles with reliability.

 

no, i just chose to have the ms control everything cause it is boost sensative, and didnt have to mess with tuning two computers

 

im sure it will save lots of hassles...but building your own pcm is just cool imo, i enjoyed doing it, and seeing something you built operate a 1000+ HP motor is just plain sick

 

well how hard would you say that was to get MSII to control everything??? With all the stuff you rigged up? on a scale of 1-10.. lol...

and how much was the total cost of going from the LT1 PCM to megasquirt run.

sorry for all the questions, but im really stocked about trying megasquirt on something finally.

 

the cost for the MSII, test board (called the stimulator board), and the harness (universal with no pig tails) was about $400. took about 10 hours of soldering to assembly the computer itself.

i traded my obdI timing cover+ $20 for someones obdII cover, sensor, and reluctor wheel. not hard to find someone to trade with as popular as the obdI conversions are for the 96-97 guys

how hard was it...hmm, it was a PITA to figure out how to make the crank trigger work, but now that i know how, its quite easy, i can walk you through it, really not too bad, as long as your competent in wiring/soldering.

 

well im going to buy the complete ready to go board cuz i hate soldering wires and never tried soldering on a board. And since this is going to run my baby im not going to learn on it. LoL.

So imma buy the stimulater and Complete board and wiring harness.

But since i already have a OBDII car, what will I do there on the ignition? And i will still be able to use my mallory box right?

Does MSII only watch the A/F ratio off one o2 sensor (random question i know. but jsut been reading and wondered)?

I have NO tuning experince at all.. i just know where my A/f ration needs to be generaly. But that is as deep as i know... so will i have a lot of probelms and a steep learning curve or what?


THanks for your help man... lol... at least i will be able to help others when i get this done a through with....

 

the only problem you'll have is the MAF and all you need to get is a pro M maf and get a good tuner. its as simple as that nothing else needs to be said . thats it!

 

There are ways to make the stock PCM read boost and work really well. I just chose to avoid the aggravation of splicing anything into the stock harness, like an accelleronics box, Pro-M MAF, etc. With a big turbo, I just decided to go with an aftermarket ECM to control everything.


I bought a FAST bank-to-bank ECM and a PCB Interface from White Racing and mounted it in place of the stock PCM (threw the stock PCM in a drawer in the garage).

The PCB interface allows you to totally get rid of the stock PCM. It's plug and play in that I didn't have to touch the stock wiring harness. I plugged the FAST into one side and the stock harness into the other. The only extra wiring added was for the programming cable and WB02 sensor -- a harness for that came with it. The PCB interface also controls all the stock gauges, including the speedo -- a set of dip switches are used for gear changes.

The best part about it was that I installed a FAST system in 15 minutes without cutting and splicing any wires.

I have a 6 speed, so I didn't have to worry about the transmission, but there are ways around the electronic auto transmissions as well.

 

that is great an all.. i mean really.. that owuld totaly kick ***.. .

But with that you got to pay to play. MSII is cheap. Very cheap... and super versitale. I mean i pay $600 for everything (on the high side, but im buying everything pre-made) and I have full control. What is not to love about that?

BUt I think the learning curve is goin to be steep :-/

 

So what did all of that cost? The FAST setup, the PCB interface, and the wideband setup to go with it...