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Old 11-01-2011, 02:46 AM
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TBI Compatible Cam ?

Learning from mistakes is where I am, LOL and cant seem to find the way out. I have a 88 suburban V20 4X4 5.7 TBI, just had the engine rebuilt and thinking a RV cam would be easy power enhancement , haul my trailer better and up the mileage some but now is a nightmare. Have had 2 chips burned thinking that would fix the drivability problem and get the power I was hoping for but it all seems to be going back to the cam, What would be the best cam to wake up this 350 and not break the bank ?

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Old 11-01-2011, 05:43 AM
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Very simple choice. However, it`s more than just the chips as well as other things that cause the low power output of TBI engines. If you didn`t replace the injectors by all means do so. Just because the ones on it still work don`t mean there still good. I learned that the hard way. As for cams it`s very limited but there`s one we suggest on a regular basis and it seems to help out TBI engines.
http://www.summitracing.com/parts/SUM-1101/
If you haven`t already, it`s also a good idea to have dual exhaust installed.
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Old 11-01-2011, 10:52 AM
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Well there is a lot you can do but you didn't say if you had the chips burnt at a local shop on a dyno or it was mail order? Big difference! So before you go with a cam I think you need to do a little reading to decide what mods you want to do to get the need power! Tbi motors the two biggest down fall are the intake and the heads! Also check out my project journal Of my son's tbi motor build!
So I would go Here First www.fullsizechevy.com
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Old 11-01-2011, 06:07 PM
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Quote:
Originally Posted by stuckNreverse
Learning from mistakes is where I am, LOL and cant seem to find the way out. I have a 88 suburban V20 4X4 5.7 TBI, just had the engine rebuilt and thinking a RV cam would be easy power enhancement , haul my trailer better and up the mileage some but now is a nightmare. Have had 2 chips burned thinking that would fix the drivability problem and get the power I was hoping for but it all seems to be going back to the cam, What would be the best cam to wake up this 350 and not break the bank ?
The Edlebrock 3702 would be my recommendation it is specifically made for TBI engines and can be had with an Edlebrock chip, not that you can't use other chips, but with those guys you know its been well designed and tested.

This links their page http://www.edelbrock.com/automotive_...chevy_sb.shtml

This snap shots the overview data
Engine Part # I&E duration at .050 and lift LSA ICA
305-350 V8 T.B.I. & LG-4 3702 194 / 214 .398" / .442" 112 107


These specs are close to the old 300 horse 327 cam #929. You won't get that power because the 327 ran over 10 to 1 compression and the TBI injectors won't/can't put that much air or fuel into the engine. These can be changed a 454 TBI or a Holley 670 cfm both of these use a 2 inch butterfly for plenty of air and either with high flowing injectors of about 90 pounds per hour can take you to a 300-330 horse engine, but that some more money to ge there.

Bogie
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Old 11-04-2011, 08:56 PM
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Quote:
Originally Posted by stuckNreverse
Learning from mistakes is where I am, LOL and cant seem to find the way out. I have a 88 suburban V20 4X4 5.7 TBI, just had the engine rebuilt and thinking a RV cam would be easy power enhancement , haul my trailer better and up the mileage some but now is a nightmare. Have had 2 chips burned thinking that would fix the drivability problem and get the power I was hoping for but it all seems to be going back to the cam, What would be the best cam to wake up this 350 and not break the bank ?
You never describe what the actual nature of the problem is so it would be hard to say what the fix will be. Still running the stock heads and intake? Check Engine Light on?, and if so what codes? Perhaps there are some wiring issues or sensor connector faults. More info and maybe I could help. I got schooled by my first TBI build
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Old 07-05-2012, 04:31 AM
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Originally Posted by Slewis View Post
You never describe what the actual nature of the problem is so it would be hard to say what the fix will be. Still running the stock heads and intake? Check Engine Light on?, and if so what codes? Perhaps there are some wiring issues or sensor connector faults. More info and maybe I could help. I got schooled by my first TBI build
If you find a couple of reply's i wrote to the problems what is and was and the parts and fix attemps etc then I wont write again I get almost done and hit a key and poof where it goes I cant tell so thanks I will talk about the schooling I have had and still the POS is messing with me I know it now. LOL thanks Del (stuckNrev)
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Old 07-05-2012, 08:55 PM
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When my TBI system stopped working correctly I knew it was in the wiring some place so I decided I wasn't going to worry with trying to trace wires down. I pulled the TBI, intake and heads. I had a set of 1998 Vortecs worked and my springs installed on them. Then I used a intake from a marine application that is a Quadrajet pattern and is a single plane with divider plate. I've got it bolted back together and lately I've been running the fuel system from the electric pump in the tank, Instead of buying a fuel pressure regulator I simply made a fuel bypass system that reverts the extra fuel back to the tank instead of flooding the carb. I got a HEI for a 1985 4.3 Astro Van that came with mechanical and vacuum advance then converted the module over to the standard 4 pin design. Here soon I'll be firing it back up and I'm looking forward to the difference in power my little 4.3 will have.
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