Hi!

I am going to install an ATI Procharger on my IROC quite soon, and in the install guide they say that I need to run it with the stock chip to avoid problems with detonation.

As most of you, I have been experimenting with making my own chip using the ARAP code as the starting point, so the question I have is:

I know I will have to start all over again from the stock chip, but if I want to use the ARAP code, what tables do I need from my stock chip except for Spark, MAF and EGR, or should I just get all of them?

I've been told that the main thing about the ARAP code is that it has got a way too agresive spark table for use with blowers, NOS os anything like that.... Any good suggestions on where to start on this new venture?

 

What do you plan to do regarding fuel while under boost? Most SC TPI cars easily max the MAF and this will need to be addressed.

The 165 isn't really the best choice for boost application.

 

Using a 165 with a blower is at best a miserable situation.
You'll be out of resolution becuase of the MAFs limitation at like 2,500 rpm.

If you running anything resembling serious boost you'll want about 17d total timing, and lots of fuel.

You need to investigate the 1227749 ecm that was used in the Syclones, or develope a system to use the late LS1 MAF with the 165. **ALL** you need to do is connect the LS1 MAF in series with the oem one (mechanically), and data logg the two, then figure out a way to convert the signal and interolate the higher airflow rates.

YMMV

 

The installation kit also comes with a progressive fuel pressure regulator (increases fuel pressure as the boost increases) and an extra inline fuel pump. According to the manual that should work with a stock chip, but since the car runs much better with the ARAP code I figured that it'd be a good idea to take some of the stock tables and copy them to the ARAP bin and then start again from scraptch....

I want to try this first if possible, if it doesn't work out, I'll get another ECM (Speed density) and start over again.

Since this is a stock engine, I'll only put 10 PSI of boost on it, that is what ATI said was safe for an L98 TPI with intercooler....

 

I am aware that the 165 is not the best for use with a blower, but I do not intend to use more than 10 PSI of boost until I have rebuilt this engine. I don't think a stock motor will take more than that even with intercooler....

Do you have the part number of the LS1 MAF?

Because I think this might be a project more than I can benefit from, and I have worked with microcontrollers before, so I don't think making a conversion box would be a too-hard project to accomplish.

I think that the first thing I want to do is just assemble the blower kit as-is and then when I first got it running figure out how to perfect it, maybe the 1227749 is the best way to go, but it's not easy to find those where I live. Probably only exists a few Cyclones/Typhoons in the whole country

 

Might not be as hard to find a '749 ECM as you think...get on

http://www.car-parts.com/

Look up the "computer" for the Sy-Ty application, the site will return a list of all available including cross-ref platforms. Call the lowest-cost junkyard and you're in business.

I just jumped on and searched on 1993 GMC Typhoon, it returned 10 pages of listings...avg price looks like $50 or so.

 

Hmmmm what MEMCAL would you use for a blown v8 application then? Was there a factory forced-air v8 for this ecm?

 

you need a V8 memcal from a 90-92 TPI SD and burn the eprom with modifed $58 code. I (with a little luck) hopefully will be firing up my Malibu running a '749 with a V8 memcal (using the 1 BAR MAP option) N/A this weekend. If all goes well I will post back with results and notes. cheers, Bob

 

Hey, thanks Bob!

This sounds like what I want to be doing then, as I'm eventually going to get that Vortech on my motor *G*. Now that it's starting to warm up, maybe I'll get my butt into the garage and start swinging wrenches