TPI Swap Question
Le Mans Master
Joined: Aug 2003
Posts: 7,720
Likes: 12
From: Chattanooga TN
What he said. I would run it as Speed Density. Just add a MAP sensor and go.
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
Melting Slicks
Joined: Feb 2006
Posts: 2,753
Likes: 15
From: backwoods upstate ny
my car ran .1 quicker 1/4 mi with maF than maP, both with generic aftermarket chips...( i have yet to get into burning my own chips, can't comment on what that would give)
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
s/d is easier to build a harness for (fewer wires), no burn-off relays like the maF needs, no space req'd for the maF sensor...the maP -727 ecm can be located under the hood (more convenient for wiring and chip changes) whereas the maF -165 ecm must be ''indoors''
my car ran .1 quicker 1/4 mi with maF than maP, both with generic aftermarket chips...( i have yet to get into burning my own chips, can't comment on what that would give)
my car ran .1 quicker 1/4 mi with maF than maP, both with generic aftermarket chips...( i have yet to get into burning my own chips, can't comment on what that would give)
Okay...all great info. Now, another aspect. TBI. Do you agree that when getting into the high RPM 350s and bigger cube small blocks that TBI is the way to go? I abandoned my TPI 400 project because I was told the TPI couldn't give the motor enough fuel / air at higher RPMs and that the TBI could be tuned better for bigger cube motors.
Burning Brakes
Joined: Sep 2006
Posts: 1,071
Likes: 86
From: Rotonda FL
The desireability of TPI over TBI depends on the end use you intend - street (usually lower rpms) or street/strip (larger displacements/higher rpms). TBI can be sized to pass more air to feed more displacement and/or higher rpms than TPI (which was designed for 305 c.i. displacement engines.
TPI excels in low and mid-range torque, providing better response than the wet-flow TBI, and better economy as well. A well designed 350 TPI, with vortec heads, matching base, enlarged runners, ported plenum, larger throttle body, upgraded injectors suitable ccustom chip, and upgraded roller cam will produce enough torque and responsiveness to equal a similarly equipped carburated 383 on the street and will produce much better fuel economy
TPI excels in low and mid-range torque, providing better response than the wet-flow TBI, and better economy as well. A well designed 350 TPI, with vortec heads, matching base, enlarged runners, ported plenum, larger throttle body, upgraded injectors suitable ccustom chip, and upgraded roller cam will produce enough torque and responsiveness to equal a similarly equipped carburated 383 on the street and will produce much better fuel economy
Melting Slicks
Joined: Feb 2006
Posts: 2,753
Likes: 15
From: backwoods upstate ny
Okay...all great info. Now, another aspect. TBI. Do you agree that when getting into the high RPM 350s and bigger cube small blocks that TBI is the way to go? I abandoned my TPI 400 project because I was told the TPI couldn't give the motor enough fuel / air at higher RPMs and that the TBI could be tuned better for bigger cube motors.
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
Melting Slicks
Joined: Feb 2006
Posts: 2,753
Likes: 15
From: backwoods upstate ny
over the last few months, tBi prices have gone up to lt1 intake prices around here, seems the ferd guys use the throttlebod on an adapter plate + a HEI with ferd bottom/drive (china made for $100) to do EFI the ez way...tPi prices are still high because it IS a cool looking deal on street rods and works good for cruising...can't give holley carbs away.
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Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
over the last few months, tBi prices have gone up to lt1 intake prices around here, seems the ferd guys use the throttlebod on an adapter plate + a HEI with ferd bottom/drive (china made for $100) to do EFI the ez way...tPi prices are still high because it IS a cool looking deal on street rods and works good for cruising...can't give holley carbs away.
So your saying if I come across a TBI manifold and carb I should hang on to them like stock with Microsoft? I was thinking of finding a big block TBI setup for a future maybe. What GM trucks came with the big block TBI?
Melting Slicks
Joined: Feb 2006
Posts: 2,753
Likes: 15
From: backwoods upstate ny
i will not advise anyone on what stocks to buy or girls to marry
Team Owner
Joined: Aug 2006
Posts: 24,125
Likes: 15
From: Columbia Missouri
Cool. I'll find one and hang on to it for a rainy day big block build.
Thanks for all the great TBI and TPI info.
