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91RSVert
Member
Joined: 16 May 2007
Posts: 2736
Location: AR
1991 Chevrolet Camaro RS
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 Posted: Sat Dec 29, 2012 5:38 am Post subject: |
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I think the 305 had 17 or 18lb. Where 350 I think had hi19's??
However, the upper plenium has a boss for the map sensor, extra vac port. There are lots of little changes..... not that they cant be overcome. I would wait and find a 90-92 map system, then find a stand alone older style base. |
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Twilightoptics
Hardcore (12sec Club)
Joined: 13 Jan 2004
Posts: 9191
Location: Auburn , WA
1987 Chevrolet Camaro IROC-Z
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| Posted: Sat Dec 29, 2012 6:58 am Post subject: |
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305=19
350=22
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A redline a day keeps the carbon away! |
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91RSVert
Member
Joined: 16 May 2007
Posts: 2736
Location: AR
1991 Chevrolet Camaro RS
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| Posted: Sat Dec 29, 2012 10:27 am Post subject: |
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damn, I was way off. But I knew they were different
Alot of people put the lt1 injectors in tpi's. |
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nonsensekid20
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Joined: 30 Sep 2010
Posts: 490
1991 Chevrolet Camaro RS
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| Posted: Sat Dec 29, 2012 3:09 pm Post subject: |
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| Wait are you saying the plenum they have for sale, since it's for a MAF system I have to drill another hole for the MAP sensor? I could always buy this setup and sell the engine harness and ECM but if I have to start drilling holes in the plenum I might be waiting for another deal. |
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91RSVert
Member
Joined: 16 May 2007
Posts: 2736
Location: AR
1991 Chevrolet Camaro RS
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| Posted: Sat Dec 29, 2012 5:21 pm Post subject: |
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yes, you understood me correctly.
On the pass side of the plenum, there is a hole drilled for a map sensor bracket, and an extra vac port that is lined up perfect for that map sensor that it has just a little elbow.
IMO, it would be best for you to find a MAP setup for sale, then find the early maf base with correct head bolt alignment, and plug your cold start injector hole.
Again, all these "flaws" can be overcome, but its money, effort, rigging, etc. |
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aaron_sK
Member
Joined: 23 Jan 2006
Posts: 8834
Location: Back in beautiful Tacompton
1987 Chevrolet Camaro IROC-Z
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| Posted: Sat Dec 29, 2012 6:36 pm Post subject: |
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I don't recall the specifics of it but you cannot just mix and match bases and runners with the early vs. late TPI stuff. James and John tried to do that on John's Trans Am and it didn't work out so well. 
I recall it had something to do with the narrow tubes on the runners not matching. Also the TB is different. |
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RSFreak
The other "John"
Joined: 23 Jan 2004
Posts: 2946
Location: Renton
1989 Chevrolet Camaro RS
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| Posted: Sat Dec 29, 2012 7:29 pm Post subject: |
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| aaron_sK wrote: | I don't recall the specifics of it but you cannot just mix and match bases and runners with the early vs. late TPI stuff. James and John tried to do that on John's Trans Am and it didn't work out so well.
I recall it had something to do with the narrow tubes on the runners not matching. Also the TB is different. |
Luckily I had two complete TPI setups (and Aaron to point out the mistakes!) 
BTW, I have an invaluable reference book called the TPI Swapper's Guide. It will tell you what works with what where early vs. late systems are concerned.
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'86 Trans Am - 5.0L TPI - LT1 cam - 700R4 - WS6
'85 Camaro Berlinetta - IROC clone
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91RSVert
Member
Joined: 16 May 2007
Posts: 2736
Location: AR
1991 Chevrolet Camaro RS
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| Posted: Sun Dec 30, 2012 6:35 am Post subject: |
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Ive mixed and match, but I do have aftermarket runners. Ive not had problems swapping TB's from different plenums.
At some point or another, Ive had both types of plenums, and 3 different bases (corvette including) and 2 different runners. This is how I learned all this and ended up costing me a few coins. |
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BluFbdy
Member
Joined: 16 Jul 2010
Posts: 915
Location: Port Orchard WA
1989 Chevrolet Camaro RS
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| Posted: Wed Jan 02, 2013 6:42 am Post subject: |
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| chevymad wrote: | | Engine harness is totally different. One car has airbags other doesn't. Wipers are part of one harness but not the other. One has a speedo module other doesn't. Mechanical vs electronic speedo. Power supply diff. It's a real mess. Sd vs maf use different ecms too. |
Haha Yup, found all this out the hard way.
As for the map sensor I just used my old tbi map bracket and mounted it in a creative fashion along with the coil, I'm using a maf setup with the CSI plugged, I used a Billet setup from someone in Oregon I believe. I figure the best way to attack this is to get the speed density stuff, mainly the harness, a tpi unit can be modified like a lot of us have done to function for SD. What I don't want to see is a hack harness job on the car. Plug and play is much easier and being that your car was 90-92 it would be much easier, the only thing you'll have to rewire to my knowledge is the Vss buffer box which takes a whole 5 mins, did some extensive searching this morning on my speedo problem and found a lot of info on tbi cars to tpi swaps lol
Clean up the parts first, check em all out then worry about the minor details look at what Luke and I did, we went at it and dealt with problems as they occured
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If you expect a kick to the balls and get a slap to the face its still a victory
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nonsensekid20
Member
Joined: 30 Sep 2010
Posts: 490
1991 Chevrolet Camaro RS
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| Posted: Wed Jan 02, 2013 9:11 pm Post subject: |
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| Yeah harness and ECM is next. Then sensors will be after. Try to get the block off plate and bolts as I go along. Speaking of, I need the throttle cable mount, intake bolts, and I'm missing 1 or 2 intake bolts. May just order that upper bolt kit off eBay. But I do need the intake bolts. Unless I can match them and find nice allen head ones at ace. hmmmm. But I do need the throttle cable and mount. |
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