92 sc motor in a 90...good idea? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 04-22-2004, 08:46 PM   #1
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Default 92 sc motor in a 90...good idea?

OK this is my situation... My 90 sse needs a tranny. I have an 88' parts car with a decent tranny in it. The plan was to swap the motors and trannies. But i can pick up a 92 SSEi in the paper for 1000 canadian. I was wondering if it would be worth my while to take the SC motor and tranny, wiring harness and the whole bit, and drop it in my 90. This will be a lot of work but does anyone think that this would be worth it? I figure that it would be a cheaper way of gaining a bit more power.
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Old 04-22-2004, 09:54 PM   #2
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why dont you just drive the SSEi and save yourself the trouble? Sell your other cars to get some money to do some stuff to the 92
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Old 04-22-2004, 10:50 PM   #3
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It not worth it at all.

Leave the LN3 3800 in the 90 and replace the tranny. Or do as Macho suggest and get the 92SSEi...better value in those options.

At any rate that tranny from the donor 88 wont work with the L67 in the SSEi
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Old 04-22-2004, 11:14 PM   #4
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Actually I was planning to take the motor and transmission and wiring together. The only reason I am considering this is because Ive spent lots of money and time on this car and the body is in excellent shape. Since i was going to change the motor and tranny I figured it could use the upgrade. Also I think that I have the 3.33 ratio in my 90 and the donor car is something else. does this mean that I can't use this transmission?
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Old 04-22-2004, 11:48 PM   #5
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If you have the tranny, the ECM, the wiring, all the harnesses, the L67 and all the proper gages (ie dash cluster...dont forget that..you may have to do something with that)...go for it.

I hope you have a floor shifter too...

You would be the first to swap into a 90 SSE.
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Old 04-23-2004, 12:55 AM   #6
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you will probably run into problems mounting the newer engine/tranny in the older body. If the 90 is in such good shape you should be able to get a good price for it. There are other things in the 92 that make it better than the 90. It will probably be very time consuming and expensive to do the switch, not to mention you wont have a car in the meantime.
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Old 04-23-2004, 08:11 AM   #7
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http://www.l67swap.com/phpBB2/ .....Try that site
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Old 04-23-2004, 08:15 AM   #8
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....Oh by the way i was gonna do something very similar to your idea but to a 91 trofeo, yes it will take a lot of work but it woulda been worth it, came across the ssei first though.... but if your up for the work, id say go for it
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Old 07-24-2007, 12:26 AM   #9
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Its not quite as serious as they make it sound. I put a 93 */c engine in my 90 bonnie and used the og harnass and a 91 le sabre trans. Once the 90 trans is rebuilt I plan to use it. Unless you change the fuel pump there won't be enough pressure for the */c injectors. It will run very rich and foul the plugs. At the moment I am using the injectors from the n/a engine and its running great. No check engine light, pre tested for smog and it passes with no problem. I have the complete harnass for the 93 */c engine and the brain. but there are additions to the 93 */c that are not on the interior harnass. Since you have the whole car, go for it.I am not done yet but i am sofar satisfied with the performance and am happy that I did it. There are 5 90 sse'* in Moreno Valley, Ca. and mines is the */c. Exclusive If I say so myself.
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Old 07-24-2007, 08:15 AM   #10
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Quote:
Originally Posted by BALLER
Unless you change the fuel pump there won't be enough pressure for the */c injectors. It will run very rich and foul the plugs.
That sounds contradictory. And with your setup the way it is now, I can almost bet you are running lean on the topend. Not good when boosted. Not to mention your lack of boost control.

Going back on topic, anything is doable given time and budget. Bodywise, you may run into the issue of needing to drill holes for your torque axis mount (they MAY already be there, but 88-91 Bonnes didn't use that mount), and use the 92-99 coolant overflow bottle. Under NO circumstance should you use the factory PCM for the car. As I pointed out above, to do the job properly you will need the knock sensor and boost control circuits. The first gen computer may have knock sensing capabilities, but not the boost control, or the proper fuel maps. If you want traction control, you will have to swap over the braking system as well....well, part of it anyways.
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