Hey everyone ,
Just got a 350 put into my 91 RS that had a 305 in it. the problem occurs with the power , something just isnt right , i only got probably like 15 more horses , barley noticable!! from a brand new engine.. RRRR!!
could it be a need a new computer ?? i am at a loss , anything will help , thanks maro buddys !
Jerry

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1991 Red Camaro RS
MODS:rebuilt 350, K & N. 10'MTX.

 

Just as a guess, it is your computer. I would not run it anymore before you do some changes. If you are just swapping engines and nothing else. There lies your problems.

1. Injectors are too small. 19 pph when it should be 22 pph
2. What cam are you using?
3. What heads and intakes?
4. What else? Headers, etc?
5. What fuel pressure?
6. What EPROM are you using? It should at least say AUJP if it is an auto.

In your case you need a new EPROM burnt. I went to www.fasterproms.com and am very happy with the results. You can have them set up the chip approximately right and run it. After that, you get readings and they fine tune it. The other off shelf stuff is just advanced timing and fan turn on temp adjustment. Waste of time.

More than likely, you will need to change your injectors if everything else checks out.

 

I am assuming that this car has TBI due to its an RS. If this is the case you will need to get a PROM from a 88-90 Chevy Caprice Police Pkg. and also the TBI unit itself. Otherwise you should be all set.

If you want more power you could get the TBI unit off of a 454 truck and use the smaller injectors from the 350, but it might require a custom PROM burn to run right.

Hope this helps some...

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Mike L.

1987 IROC Z 5.7 TPI A4 3.27 Borg-Warner four wheel disc
Mods: 2300-2500 Stall Converter, Shift Kit(GM parts), TPI Specialties Stage 3 PROM, Modified airbox w/ K&N's, Relocated MAT sensor, Gutted MAF, 160* thermostat, MSD 6A, Accel 8mm Wires, bypassed TB coolant, 3" Flowmaster 3 chamber single outlet, custom adjustable cutout, 3" MAC mandrel intermediate, airfoil, ported plenum. !smog, Crane AFPR, Accel rail mounted FP gauge, Harlan shiftlite, 24lb. injectors, Hedman headers, a few others I forgot...??? FINALLY GOT PAINT!!

Check out my IROC webpage!

 

Heebs, You live in Michigan, I can burn you a chip if you'd like or I could attain the part # for you so you could go buy it from a GM dealership. Also, where is Commerce? I know I have seen it before in my travels.

Don't go to any aftermarket tuners for your stock motor. aklim loves to spend money. So unless you're rich like he is, stay away from aftermarket tuners. They charge hundreds of dollars for somthing I can do for about $15 and a few hours.

EDIT:
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aklim, I know I have told you this before but it doesn't seem you understand yet. I gained .7 in the 1/4 and 3 mph with a chip I burned last week. It is just an '89 factory file I put on there. I HAVE YET TO TOUCH ANY OF THE CALIBRATIONS IN THE CHIP YET! Imagine what I will gain when I do start messing with the calibrations. Oh, by the way, you don't burn just 1 chip and call it good. I have burned about 5 so far just experimenting.

Have a nice day.

[This message has been edited by RedIrocZ-28 (edited August 07, 2002).]

 

First and foremost, I am not that rich, which is why I'd rather get someone professional to do it that to screw it up myself. I have been involved in projects that are a simple replacement of something but because of lack of knowledge, I had to learn it the hard way and pay for the fix and the damage caused. I am only advocating not doing something you are not familiar with. Perhaps we should have you (RedirocZ-28) with us when we tried to get the bargain DFI unit to work. The amount we saved getting someone familiar to work with it was spent up and more from a new engine. Wanna buy the old "slightly used" engine we removed? I like to learn about something properly BEFORE I mess with something. I stay far away from "Learn on the Fly" or "Make it up as I go along". Also, the new short block did not install itself. I didn't see you or your wrenches there, or was I too busy working on it? Since you are so good, why don't you make an enterprise out of it charging us unfortunate folks who have to depend on the tuners say $50 and warranty the work? Say I plucked out my expensive ERPOM and put yours in, how long before you get it running as good as the one I got? How much time experimenting before you can get everything from start to shutdown to be smooth and WOT to be as good or better than my expensive ERPOM? How long is your warranty on engine damage caused by the EPROM?

RedIrocZ-28, what is it that I don't understand? Please explain it to all of us here? I would gain at least a second with my chip from the stock too, assuming the stock will run. I spent 1 hour, total time which includes setting up the laptop to work with the Diacom and taking the runs for the 2 burns to get it perfect. It is my DAILY DRIVER (ALL 365 days) so I don't have time to fiddle with the chip as far as downtime and all the different test runs I will have to make. IF & WHEN you do get the calibrations all right and you are ready to do EPROM burnings for the rest of us suckers here, lets see how much you charge. Obviously you don't seem to figure time spent on the project as a cost factor.

RedIrocZ-28, here's a challenge for you. Put your money where your mouth is. Go master all the calibrations has to offer. Come back here and offer your services for a lower price. Fasterproms charges 500 for the first and 150 for each time they have to make changes. Lets see you do better than that. Test your knowledge out by seeing how long you take to take a fresh motor with mostly aftermarket performance stuff and make it streetable. From start to end of the program. It must have full functionality of all emmission systems, go WOT like a bat out of hell and be totaly docile while driving in town with good gas mileage. IOW, it must feel as close to stock as the camshaft will allow.

 

Ya know what aklim, fine do it your way. If you don't want to spend the time learning to burn your own chips then don't. I was simply trying to provide a cheaper way to go when doing a motor buildup and getting the chip to go with it. Not everyone has the money to get an Ed Wright Custom chip. You did. Most don't, like myself. That is why I spent the money for the burning equipment. It was all total around $400 but I can burn chips indefinitely now. With every mod, I can hook up a scan tool(included in the $400) and check to see if I need to change anything. And I don't have to pay for it ever again when I need a new chip.

You advocate aftermarket tuners, I advocate DIY. Lets not get in a pissing match over it. I do not claim to be better than they are, just trying to provide a cheaper route to getting a motor to run correctly.

Truce?

 

Truce.

 

Thanks for the insight fellas ,
So basicallly u think that the problem is that i need a new computer ? The old engine had 150,000 miles on it and was a 305. The new engine is a 350 with like 300 on it. i can barley tell the difference, it sucks. Hopefully getting the computer for it will help.thanks
Jerry

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1991 Red Camaro RS
MODS:rebuilt 350, K & N. 10'MTX.

 

Kick his ***, SeaBass!!!



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Denny Villemure
1989 Camaro IROC-Z Convertible, 305 TPI, 2.73 Gear, Flowmaster 2 chamber. 15.60 on motor, 14.20 on a 75 shot from NX. Woo hoo!
www.denny.cz28.com