I am building a 383 stroker with AFR as cast 195cc heads, comp cams 08-502-8 cam 218/224 .528"/.536" with 1.6 rockers for my 1987 Camaro with 700R4. I wanted to use the stealth ram or to a lesser extent the Edelbrock Pro Flo XT intake.

The Pro Flo XT can be ordered with as a complete EFI system. So can the HSR but for 1.5x the price.

My goals are a weekend driver that fires up, idles low and smooth and can be driven around town or to the lake if I want. I've played the big cam game before and while cars go fast dealing with tuning and drive-ability is tiring.

Does my combo warrant a aftermarket EFI computer, or is the GM MAF 1227165 ECM with some tuning sufficient?

Would the Pro Flo XT provide a better out of the box solution?

In the end if I work the numbers I would be paying about $1500 for the aftermarket ECM and supporting components aside from the base intake manifold.

 

383 with that cam... should be very tunable with the factory ECM. Tunedperformance is good with the MAF stuff. My guess is he probably already has a tune for a fairly straightforward combo like that.

 

It all depends on who is doing the tuning. If you are or have someone capable of tuning oem electronics, then the stock stuff will do fine as long as its in good shape. Ofcourse there can be issues with faulty electronics since these systems are 30+ yrs old now.

if you need someone else to tune that does not have any capability of doing oem stuff, which most shops these days are not familiar with 80’s tech, then there is benefit to aftermarket efi especially holley terminator or hp type efi. They are user friendly and a lot of online support for help

 

Brian did my 1985 Z28 swapped to a '730 ecm. I still have all the equipment to do this one if I go that route.

 

It's mostly when you get into big power and need a lot more fuel that the stock computer hits it's limitations. No chance the stock computer could control my 1000cc (100lb) injectors in bank fire. It can't fire them slow enough and at the correct time and doesn't have the ability to do negative PW offsets for voltage compensation as many of the new large injectors require.

You will get a smoother idle with full sequential injection. And it does help with fuel economy and eliminates some of the weirder effects of fuel pooling behind closed valves.

GD

 

I have a SDS Simple Digital Systems EM3 stand alone system I tried in my Mustang. Too bad it wouldn't operate the GM V8. It was a breeze to tune and use and is just sitting in a box in my garage. On the mustang I went back to the stock EEC-IV and had remote tuning done on it. If I can get the GM TPI computer to function as well as the Ford I will be happy.

 

my 730 with code $59 ran 80’s and 127’s just fine in my 400” deal. But sequential was abit smoother

 

What's the wildest na combo you have done using the speed density batch fire stuff Orr? And to clarify, tuned with close to oe cold starts, drivability etc. Obviously making something that is blubbery at and off idle but comes to life at 2500-3000 rpm to make a pass but can't cruise without cam surge etc would kinda suck for a real daily driver car

 

well basically my 401” turbo motor is na until you get wot so it drove and started well like any other deal out there. It had 245 cc heads that flowed 330, it had 246/252 duration and .640 lift. Just low compression. My 383 maf car wasnt super wild but afr 195 heads , .600” cam and 230/245 degs on a 109 lsa, certainly abit more aggressive than most guys go on cams. It was very happy.

my friends 406 was the narliest na combo i’ve seen. His solid roller was abit bigger than my hyd roller in the 401” turbo car but my heads were bigger and better. His were good ported afr heads and the car made over 520 whp naturally aspirated with a 6 spd. Also drove great.

all depends on what your definition of streetable and well mannered is, but most auto trans cars with good converters seem to swallow up big cams. Havent really had issues with big cams on that kinda stuff.