69442DREAMCAR

Found a clean Trans Am in the upullit yard, hit hard on right front corner. Its a factory carb car. Could I pull the tank unit and quadrajet intake and put a regular quad on it. I have to make the change with the Comps 260h cam in my 89 RS 350 swap. I have the Mallory regulator but thought this might be a better way to go.

five7kid

iTrader: (14)

Why go with a regular q-jet? The computer system is a great street-performance set-up. Depending upon which Comp cam exactly, it shouldn't cause the computer any problem.

If the car is an '87, it's got the in-tank electric pump, anyway.

You would need more than the intake. You'd need a non-computer distributor and some means to lock up the torque converter clutch.

Of course, this wouldn't be emissions-legal.

69442DREAMCAR

Comp 260h which every other post I put on here tells me is going to cause all kinds of problems with the computer. I put this motor in before I found this web site, or I would have changed some things before installing this motor. I don't want to spend alot trying to buy the things to burn chips because its the only third gen I have. Someone posted on here that I could get it done in Baton Rouge La. I am in Shreveport La. as far north as you can get with out being in Arkansas. Baton Rouge is as far south as you can get with out being in the ocean. And probably no one in north La. can do the chips. This a hot bed of dirt track racing and we have Red River Raceway in Gilliam where they filmed a pinks all out. I have the only none stock third gen around. All though there is a 92 RS stocker in town for sell with than less than 40,000 miles I would love to have. A few more clean stockers running around. If it had 24" inch rims I could get anything I need for it, as there is 100 or so youngsters running around every Sunday in the park a block from my house. I might as well pull my motor and put the 305 back in it. Oh yeah the Chevy dealership in a near by town has a 91 RS with 19,000 miles but they are asking 21,000 for it.

five7kid

iTrader: (14)

The TBI computer is very particular about things such as cams. The 260H isn't all that radical, but may give a TBI speed density system fits. The carb computer isn't going to care.

Do you have the car running with the 350? Are there problems you can't tolerate? I guess I don't understand the situation completely. If you're just going off what you've heard, it's probably jumping the gun to assume the cam is a killer. The 350 will be more of an issue with a TBI computer than the cam itself would be.

Is this a roller lifter cam or flat tappet?

69442DREAMCAR

Wasn't planning to use carb computer, was going with new dist. regular quadrajet etc. Yes car runs and runs fairly well, did everything it said on here for 350 tbi swap. Some like knock sensor, cop car chip etc. I did after I got car running then found this site. It seems to have a hesitation or stumble on take off. Runs great out on interstate at 70 mpr. Just can't seem to get it right for a daily driver. Started reading on here and seems everyone with these problems or either pros at tuning computer or get rid of the computer. Thanks for concern and please keep coming with them.

69442DREAMCAR

Am I the only one that noticed, you start a post. Someone answers and you think you may get some help. They ask you alot of questions and you answer all of them and you get no more replies. I was looking back at how many times that has happened to me since trying to get the problems ironed out with my 89 RS. At least the stickies help alot.

five7kid

iTrader: (14)

Well, you didn't answer the question about roller of flat tappet cam. . .

I guess it's up to you. The only emissions-legal route is EFI. I am no PROM tuning 'spert, so I can't help much there (that's TBI forum fodder). Going mechanical q-jet might solve some of the problems. I think I already answered the rest (regarding what it would take to get it operating - the JY car wouldn't have everything you need for non-computer q-jet).

69442DREAMCAR

Flat tappet cam. And the jy car is a 82 with cc carb and mechanical pump. I thought these didn't have a tank pump, so wouldn't be similar to the pick up that is shown built in the stickies for not using intank pump?

five7kid

iTrader: (14)

An '82 factory carb car would not have an in-tank electric pump and would have a plain pick-up.

84imsa

If you're already on the non-computer Q-Jet, an off-idle stumble almost always means a lean mixture. If the engine runs well at WOT then your jets are probably already in the ballpark.

Change to a smaller primary metering rod to enrich your idle/cruise mixture.

A stronger power piston spring will pull the primary rods up out of the jets faster on takeoff, enriching the mixture more quickly.

Edelbrock sells (used to sell?) Q-Jet calibration kits with a basic selection of needles, jets, springs, hangers, etc. I bought mine in the 90's and have been enhancing it with odd bits from q-junk.

The beauty of the Q-Jet is that there are so many things you can adjust to optimize performance. Unfortunately, all those adjustments are merely a curse to the impatient. It's sometimes difficult to follow this excellent advice: only change one thing at a time. I usually follow it and the result is almost always instant gratification. Whenever I get impatient and try to change more than one thing in one go, confusion is usually the result.

It is possible to approximate the efficiency of mechanical fuel injection if you have the patience.

Happy tuning!

BTW, engine management computers are evil and must be destroyed!

69442DREAMCAR

Still TBI, the stumble is what has me thinking of the carb swap.