1994 Chevy Silverado marine engine 5.7gi volo penta series

Tiny
MIKEKENNEDY
  • MEMBER
  • 1994 CHEVROLET SILVERADO
  • V8
  • 2WD
  • AUTOMATIC
  • 60,000 MILES
This motor has 250 hp. I am ready to rebuild and I want a motor with 290-300 hp. This motor has a tbi
fuel system. My question is, can this tbi system handle
this much change ie 250-300hp, also will the stock
computer also handle this change?
Any info. Would be grealtly appreciated
Thank you mike kennedy
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Sunday, September 27th, 2009 AT 11:57 PM

5 Replies

Tiny
RACEFAN966
  • EXPERT
To answer your question NO. The tbi system as it is can't do the job and the computer can't compensate for the added HP. Now also if you are using a Marine engine to replace you truck engine you will not have a place for a lot of the sensors either. If you really want to do this you will need to contact Jet Electronics or Hypertech or? To see if they can reprogram the computer and also you will need to get a wide band O2 sensor, which is hard to find in a multipul wire type and change to a larger injector. If you have a mass air flow sensor then it makes it easier. Hope this helps.
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Tuesday, September 29th, 2009 AT 10:18 AM
Tiny
MIKEKENNEDY
  • MEMBER
Thanks for your response to the 1994 silverado
question. The engine is a volvo penta marine
engine and it is hopefully going back in the boat it
came out of. The only reason I mentioned a silverado
was because this site is for cars not boats.
If you can give me any more leads as far as web
sites it would be appreciated. Again thanks
Mike Kennedy
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Wednesday, September 30th, 2009 AT 1:33 AM
Tiny
RACEFAN966
  • EXPERT
Ok so tell me what you are trying to do and what you want your outcome to be. What fuel system is it using and such. An engine is an engine it really don't matter what it is in they all operate in the same manner. If you are building an engine for your boat then you have a little more freedom too. Let me know what sensors you have and if you O2 sensor is one wire or multi wire. Get back to me and we will go from there.
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Wednesday, September 30th, 2009 AT 10:29 AM
Tiny
MIKEKENNEDY
  • MEMBER
This engine does not have a 02 sensor, it does have
a knock sensor, ect sensor, pcm & map sensor with a
ecu[electronic control module]
I would like to increase the hp, is it possible to change or reprogram the ecu unit and also change
the map sensor if needed to be compatible?
I am hoping to gain 40-50hp by changing the heads
and cam also keeping the compression ratio at 9.3:1
If I have to change to a different ecu unit, are there
any adapters available to make it somewhat simple.
I don't have a problem donating $$$ if you can
give me the info I need to do this!
Thank you Mike Kennedy
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Wednesday, September 30th, 2009 AT 10:09 PM
Tiny
RACEFAN966
  • EXPERT
Ok lets look this over. Now I would check with Holley on there web they have a map sensor that works on a lower vacuum. Now with that you can check with Delta camshaft in Tacoma Washington for a good power cam give them all the specs you can and they will cut you a cam. As for the computer get in touch with hypertech or jet and see if one of them can reprogram the computer with a little different timing curve. You can do the head changes but then I would port match them for more HP and then you can look into intake options too. Now if you don't go to wild on the cam then you may not have to do anything with the map or the computer. Meaning if you change heads port match them and do a mild cam change it should run and give you the gains you are looking for. Delta cams 1-253-383-4152. Jet chips is 800-535-1161. Let me know what else you need and how it goes.
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Thursday, October 1st, 2009 AT 9:46 AM

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