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#1
02-20-2005, 12:42 AM
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tb cpi mpfi
ok, my truck has a tb, ive heard of people talken of cpi, i know tb is a step up from a carb, but not a whole bunch more, what is cpi and will it give me a little more power then a tb? Also is it possible to do a multi port on a 98 4.3L? I was going to do a moter swap, but now im not sure, grandparents are still willing to do the sb for me, but im not sure if its worth it... i know its a stupid question to someone but thanks for taken the time and answern it for me
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#2
02-20-2005, 05:43 AM
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If you have a 98, you already have Muliport fuel injection, NOT Throttle Body Injection. You use a Central sequential injector. There would be no real benifit to going to fuel rails with individual injectors since you have a sequential system already. TBI stopped in 95 as did CPI... CPI is the predecessor to yours. Very similar injector system but instead of being sequentially fired, it's batch fired, and CPI is still MPFI.
On a side not, look at the 8th digit of your VIN on the driver's side Windshield. Is it a W or an X ?
__________________
  95 s10 Blazer, EGR Mod, ZQ8 Steering box mod, 99 Center console shifter mod and more... See everything at www.pghconsulting.net/teal
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#3
02-20-2005, 11:31 AM
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Re: tb cpi mpfi
it is an x, and thanks for the info... never seen a mp w/out a fuel rail, thats why i was confused thinken tb
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#4
02-20-2005, 02:36 PM
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Re: tb cpi mpfi
At this point the only real diff between yours and the W motor is slightly smaller cam and some ECM programming on the fuel curves. Other than than it's the same injection and same motor.
__________________
95 s10 Blazer, EGR Mod, ZQ8 Steering box mod, 99 Center console shifter mod and more... See everything at www.pghconsulting.net/teal
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#5
02-20-2005, 02:43 PM
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Re: tb cpi mpfi
no cam, rocker roller
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#6
02-20-2005, 06:10 PM
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Re: Re: tb cpi mpfi
Quote:
__________________
95 s10 Blazer, EGR Mod, ZQ8 Steering box mod, 99 Center console shifter mod and more... See everything at www.pghconsulting.net/teal
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#8
02-20-2005, 11:22 PM
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Re: tb cpi mpfi
our trucks use rocker cams instead of the traditional cam, kind o sucks, harder to find high preformence cams and a true cam kit is 1400 bucks
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#9
02-21-2005, 05:01 AM
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Actually our trucks use regular cams with roller rockers.... If you're looking for a more agressive cam, go to comp cams, they make several for our trucks.
__________________
95 s10 Blazer, EGR Mod, ZQ8 Steering box mod, 99 Center console shifter mod and more... See everything at www.pghconsulting.net/teal
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