5 speed swap in crossfire so i keep going back and forth on what im going to do here. i finally got the crossfire running good, and i think i want to keep it in the car. its a 83 daytona pace car but i really want a 5 speed. i have the opertunity to purchase a 84 trans am 5 speed that would be for parts i have done some searching on here and only found 1 person that has done a 5 speed swap in a crossfire. i messaged them but i do not think they are a member on here anymore for the post was created years ago. anyway he talked about the car surging while in neutral and had to rewire part of the computer. anyway im just looking if anyone on here has done the 5 speed swap with a crossfire and had any problems since the engine is computer controlled? besides the normal swap is there anything extra that i have to do that is related to the crossfire? |
Re: 5 speed swap in crossfire A swap to 5spd in an ECM car isn't complete unless the PROM/BIN, park/neutral switch wiring and VSS are done correctly. In your case, the T5 needs a mechanical speedo gear setup, your VSS on the speedo will be fine, the park/neutral switch wiring needs setup like any manual trans. ECM-equipped third gen, and a manual crossfire 305 PROM should be used (did they make those?) Surging, stalling while in neutral at road speed, incomplete operation of EGR and emissions purge systems are all indicative of an incomplete swap. |
Re: 5 speed swap in crossfire
Originally Posted by jmd
(Post 5193307)
A swap to 5spd in an ECM car isn't complete unless the PROM/BIN, park/neutral switch wiring and VSS are done correctly. In your case, the T5 needs a mechanical speedo gear setup, your VSS on the speedo will be fine, the park/neutral switch wiring needs setup like any manual trans. ECM-equipped third gen, and a manual crossfire 305 PROM should be used (did they make those?) Surging, stalling while in neutral at road speed, incomplete operation of EGR and emissions purge systems are all indicative of an incomplete swap. thats what im trying to figure out b4 i jump into the project. they never made a crossfire 5 speed so is there a way to bypass the wiring or wire it to a different source. |
Re: 5 speed swap in crossfire
Originally Posted by 386kustoms
(Post 5193459)
thats what im trying to figure out b4 i jump into the project. they never made a crossfire 5 speed so is there a way to bypass the wiring or wire it to a different source. Good luck on the swap, I would try to find a complete car, or jyard car to pull everything else off of, it would make the swap a lot simpler. |
Re: 5 speed swap in crossfire i have accsess to a 84 trans am carb 5 speed so i will have a complete parts car. i kinda wanted to keep the crossfire setup to be different. i am not looking for power gains or racing or anything like that, i just want some fun while i drive it |
Re: 5 speed swap in crossfire For sure man I understand. My car was originally crossfire, but the po swapped it to carb. I think the crossfire looks pretty cool, post a pic of your motor if you can. Is your car mostly stock? |
Re: 5 speed swap in crossfire I believe there have been a few efforts to running the CFI off a later ECM (like the very-well documented TBI '747; maybe the '746 used in the 88-92 F-bodies.) If you do enough searching and reading on thirdgen, you'll find more detail. As a parts car, an '88-'92 TBI 5 speed third gen could be a goldmine for you. It would have a later, better T5 and more helpful ECM and wiring parts. The '747 and '746 are very similar but have a very small number of wires / circuits that are different. |
Re: 5 speed swap in crossfire the car is 100% origional and i think it would be cool if i ever showed it to have a crossfire still in it, cause hell we all know every car at the shows are chromed out w carbs and im just not into that. i realize the later trannys are better but i want to keep a mechanical speedo without buying a 300 converter. plus im not racing it or anything like that, just something fun to drive. so unless i find a good deal on a martin turbo setup its staying crossfire, there is a 88 i do belive z28 at the upull it here that was a 5 speed that still has the ecm in it. i may have to go check it out now what is meant by a 747 ecm? is that a part number that i can find on the computer itself? even if i decide not to go that rout would it be wise for me to pick up from the z28 in the yard if that is what it has? |
Re: 5 speed swap in crossfire Contact Tom 400 CFI He did the 5 speed swap. Although he no longer has the car, he has plenty of Crossfire knowledge and can give you some good info. |
Re: 5 speed swap in crossfire Please keep in mind I'm not screaming that you should rip, cut and de-originalize your car. That out of the way...
Originally Posted by 386kustoms
(Post 5194160)
the car is 100% origional and i think it would be cool if i ever showed it to have a crossfire still in it, cause hell we all know every car at the shows are chromed out w carbs and im just not into that. i realize the later trannys are better but i want to keep a mechanical speedo without buying a 300 converter. plus im not racing it or anything like that, just something fun to drive. so unless i find a good deal on a martin turbo setup its staying crossfire, there is a 88 i do belive z28 at the upull it here that was a 5 speed that still has the ecm in it. i may have to go check it out now what is meant by a 747 ecm? is that a part number that i can find on the computer itself? even if i decide not to go that rout would it be wise for me to pick up from the z28 in the yard if that is what it has? A thread here on thirdgen had this link: http://www.austinthirdgen.org/index.php?pid=19 which lets you look at some wiring differences. Some wires / circuits will be identical. Some will be different. You can put a different ECM to engine harness in a thirdgen without permanently modifying anything about the car. It takes planning ahead, sometimes building a short in-between harness and other small planning bits. But, if planned out, a later year TBI 305 ECM and harness could easily control your earlier 305 and achieve what you're seeking. It's just not going to be a 30 minute project. Nor will you get by without doing a healthy amount of reading. |
Re: 5 speed swap in crossfire I am pretty sure the T5 will run just fine off the original ECM. |
Re: 5 speed swap in crossfire well thanx for all the help everyone. i usually screw around with older cars or obd2 cars that i can have the computer flashed. so even though this is old stuff its new to me. i gess i have to do some figuring b4 i jump into anything |
Re: 5 speed swap in crossfire Just retain the original automatic neutral safety switch inside the center console and use a screw driver to move the contact plate inside to the "DRIVE" selection. This makes the ECM think its in gear so the engine won't stall when pushing the clutch pedal in. You're basically doing the same thing that factory manual transmission ECM PROMs are programed to do without a switch. I also have a complete 5-speed setup from a '84 Trans Am that I have been toying with the idea of installing in my '82 Recaro T/A CFI but with 52,000 original miles I haven't been able to get myself to cut holes in the firewall and transmission tunnel for the swap! I did a manual trans swap on my '71 Trans Am about 10 years ago and its a much more fun car to drive now. |
Re: 5 speed swap in crossfire I just did a T5 swap in my 83 Z28 CFI. The only issue I am having is an inconsistent idle. After it warms up the IAC's seem to keep the idle between 1000 and 1300, surging between the 2. I have already replaced the coolant temp sensor and both IAC's before doing the swap. It was running great before I did the swap. I wanted to be sure of that before doing the swap. Other than that it runs great and I love the throttle response. Not throwing any codes at all and I have already replace vacuum lines previously and double checked to be sure. Base timing is correct. Getting a little frustrated. I did obtain an ECM out of an 89 TBI Camaro 5sp,1228746 but don't have a clue as to how to get it to mate with my system. Wiring is not really my specialty. Any ideas on where to go from here would be greatly appreciated. |
Re: 5 speed swap in crossfire start reading here: https://www.thirdgen.org/forums/tbi/...-tbi-swap.html |
Re: 5 speed swap in crossfire
Originally Posted by rwallis
(Post 5309422)
I just did a T5 swap in my 83 Z28 CFI. The only issue I am having is an inconsistent idle. After it warms up the IAC's seem to keep the idle between 1000 and 1300, surging between the 2. I have already replaced the coolant temp sensor and both IAC's before doing the swap. It was running great before I did the swap. I wanted to be sure of that before doing the swap. Other than that it runs great and I love the throttle response. Not throwing any codes at all and I have already replace vacuum lines previously and double checked to be sure. Base timing is correct. Getting a little frustrated. I did obtain an ECM out of an 89 TBI Camaro 5sp,1228746 but don't have a clue as to how to get it to mate with my system. Wiring is not really my specialty. Any ideas on where to go from here would be greatly appreciated. |
Re: 5 speed swap in crossfire
Originally Posted by chazman
(Post 5309489)
Tell us more about your combo. I'm planning a T5 swap in my '83 CFI as well. Which T5 do you have? What rear gear ratio? |
Re: 5 speed swap in crossfire
Originally Posted by chazman
(Post 5309489)
Tell us more about your combo. I'm planning a T5 swap in my '83 CFI as well. Which T5 do you have? What rear gear ratio? |
Re: 5 speed swap in crossfire
Originally Posted by chazman
(Post 5309489)
Tell us more about your combo. I'm planning a T5 swap in my '83 CFI as well. Which T5 do you have? What rear gear ratio? |
All times are GMT -5. The time now is 06:47 AM. |
© 2024 MH Sub I, LLC dba Internet Brands