TPI swap with a modern twist
04-12-2012, 12:28 PM
#2
Holley HP EFI w/TPI
Thread Starter
Started with the fuel pump, chose Tanks Inc in tank setup.
http://forums.corvetteforum.com/c3-t...p-install.html
http://forums.corvetteforum.com/c3-t...p-install.html
04-12-2012, 12:57 PM
#5
Team Owner
Member Since: Oct 2004
Location: altered state
Posts: 81,242
Received 3,043 Likes
on
2,602 Posts
St. Jude Donor '05
That the new Holley system?
Whats the hp limit on those do you know?
Whats the hp limit on those do you know?
04-12-2012, 03:46 PM
#6
Holley HP EFI w/TPI
Thread Starter
04-12-2012, 08:47 PM
#7
I will be watching this one! I have the same kit...looks like you are closer than me! Body is still off.
I got a kit from Moore Raceraft, I think they designed it(?) I also went with the daul snyc dist. for Multi Port efi. The touch screen and gauges look interesting?
I got a kit from Moore Raceraft, I think they designed it(?) I also went with the daul snyc dist. for Multi Port efi. The touch screen and gauges look interesting?
04-12-2012, 09:47 PM
#9
Melting Slicks
[QUOTEWhats the hp limit on those do you know?[/QUOTE]
Word on the street is the limiting factor on the factory TPI system is the size of the runners and injectors. The system was originally designed for a 305. When installed on a 350 it runs out of breath at about 5000 rpm. There are aftermarket runners available and of course bigger injectors.
Word on the street is the limiting factor on the factory TPI system is the size of the runners and injectors. The system was originally designed for a 305. When installed on a 350 it runs out of breath at about 5000 rpm. There are aftermarket runners available and of course bigger injectors.
04-12-2012, 09:51 PM
#10
Team Owner
Member Since: Oct 2004
Location: altered state
Posts: 81,242
Received 3,043 Likes
on
2,602 Posts
St. Jude Donor '05
Wondering if it could feed 600 +-
Not that I want to put FI on it but it all looked well over time. Maybe.
Probably not but maybe
Not that I want to put FI on it but it all looked well over time. Maybe.
Probably not but maybe
04-13-2012, 08:29 AM
#11
Burning Brakes
Word on the street is the limiting factor on the factory TPI system is the size of the runners and injectors. The system was originally designed for a 305. When installed on a 350 it runs out of breath at about 5000 rpm. There are aftermarket runners available and of course bigger injectors.
Just as with the earlier (82/84) crossfire injection, the manifold base plate is very restrictive. You can increase your throttle body flow, port the plenum and put on larger runners and get a little more, but you're not going too far without addressing the restrictions in the base plate (and heads). Suggest that you look at the vortec heads and matching base plate to get more power and rpm and really use the money that you put into the top of your engine.
Just as with the earlier (82/84) crossfire injection, the manifold base plate is very restrictive. You can increase your throttle body flow, port the plenum and put on larger runners and get a little more, but you're not going too far without addressing the restrictions in the base plate (and heads). Suggest that you look at the vortec heads and matching base plate to get more power and rpm and really use the money that you put into the top of your engine.
04-13-2012, 08:36 AM
#12
Instructor
Member Since: Jul 2011
Location: Hayward SD
Posts: 138
Likes: 0
Received 0 Likes
on
0 Posts
Word on the street is the limiting factor on the factory TPI system is the size of the runners and injectors. The system was originally designed for a 305. When installed on a 350 it runs out of breath at about 5000 rpm. There are aftermarket runners available and of course bigger injectors.
Just as with the earlier (82/84) crossfire injection, the manifold base plate is very restrictive. You can increase your throttle body flow, port the plenum and put on larger runners and get a little more, but you're not going too far without addressing the restrictions in the base plate (and heads). Suggest that you look at the vortec heads and matching base plate to get more power and rpm and really use the money that you put into the top of your engine.
Just as with the earlier (82/84) crossfire injection, the manifold base plate is very restrictive. You can increase your throttle body flow, port the plenum and put on larger runners and get a little more, but you're not going too far without addressing the restrictions in the base plate (and heads). Suggest that you look at the vortec heads and matching base plate to get more power and rpm and really use the money that you put into the top of your engine.
Maybe the C4 is less restrictive than the IROC OR Firebird?
04-13-2012, 08:37 AM
#13
Team Owner
Member Since: Oct 2004
Location: altered state
Posts: 81,242
Received 3,043 Likes
on
2,602 Posts
St. Jude Donor '05
They run out of breath about 4k or so.
Work with a lot of those TPI systems (meaning porting)
A heavily worked aftermarket base, runners and plenum will bump things up a nice notch. Thing is the cost. Just got done with a members SLP system. By the time he bought the stuff had it all ported to the max and polished hes easily in the intake over $1500.
Cam it the opposite of the way you would a carb. 2teens in the intake...even on a 383.
If you really want a killer TPI system look into the FIRST intake system
about $850 w/a throttle body. Its a king sized beast.
They are now coming out with a 2" dia runner, too. Nice.
Work with a lot of those TPI systems (meaning porting)
A heavily worked aftermarket base, runners and plenum will bump things up a nice notch. Thing is the cost. Just got done with a members SLP system. By the time he bought the stuff had it all ported to the max and polished hes easily in the intake over $1500.
Cam it the opposite of the way you would a carb. 2teens in the intake...even on a 383.
If you really want a killer TPI system look into the FIRST intake system
about $850 w/a throttle body. Its a king sized beast.
They are now coming out with a 2" dia runner, too. Nice.
04-13-2012, 09:53 AM
#14
Holley HP EFI w/TPI
Thread Starter
Word on the street is the limiting factor on the factory TPI system is the size of the runners and injectors. The system was originally designed for a 305. When installed on a 350 it runs out of breath at about 5000 rpm. There are aftermarket runners available and of course bigger injectors.[/QUOTE]
Very true, but my car has a basic 350 and only sees road duty (drive to work, corvette club cruises etc).
I was concerned more with driveability, rather than peak power.
Very true, but my car has a basic 350 and only sees road duty (drive to work, corvette club cruises etc).
I was concerned more with driveability, rather than peak power.
04-13-2012, 09:56 AM
#15
Holley HP EFI w/TPI
Thread Starter
04-13-2012, 10:01 AM
#16
Holley HP EFI w/TPI
Thread Starter
TPI used $250 (I've seen them as much as 400-500)
Holley HP EFI $1500
Tanks Inc PA-4 fuel pump $250
How detailed a breakdown do you want of all the kibbles and bits?
04-13-2012, 10:03 AM
#17
Holley HP EFI w/TPI
Thread Starter
Word on the street is the limiting factor on the factory TPI system is the size of the runners and injectors. The system was originally designed for a 305. When installed on a 350 it runs out of breath at about 5000 rpm. There are aftermarket runners available and of course bigger injectors.
Just as with the earlier (82/84) crossfire injection, the manifold base plate is very restrictive. You can increase your throttle body flow, port the plenum and put on larger runners and get a little more, but you're not going too far without addressing the restrictions in the base plate (and heads). Suggest that you look at the vortec heads and matching base plate to get more power and rpm and really use the money that you put into the top of your engine.
Just as with the earlier (82/84) crossfire injection, the manifold base plate is very restrictive. You can increase your throttle body flow, port the plenum and put on larger runners and get a little more, but you're not going too far without addressing the restrictions in the base plate (and heads). Suggest that you look at the vortec heads and matching base plate to get more power and rpm and really use the money that you put into the top of your engine.
04-13-2012, 10:12 AM
#18
Team Owner
Member Since: Oct 2004
Location: altered state
Posts: 81,242
Received 3,043 Likes
on
2,602 Posts
St. Jude Donor '05
That cost isnt bad at all. Figure a few hundred for odds and ends?
What about a distrinutor/ign how does that work out with that system?
If the op is just using his 350 as a cruiser suppose thestock TPI will get him around fine.
If in search of a lot of power almost not worth it the runner length as a whole is the limiting factor.
They have great throttle response and torque on the street though.
What about a distrinutor/ign how does that work out with that system?
If the op is just using his 350 as a cruiser suppose thestock TPI will get him around fine.
If in search of a lot of power almost not worth it the runner length as a whole is the limiting factor.
They have great throttle response and torque on the street though.
04-13-2012, 10:13 AM
#19
Holley HP EFI w/TPI
Thread Starter
For people thinking about this, here's some info about my choices
Why TPI?
Lots of them available used
lots of aftermarket support/options
fits under the stock hood
driveability
Why not EZ-EFI or Holley Avenger TBI?
I figured if I was going EFI, I'd use a manifold designed for EFI.
carb look isn't important to me
8 injectors vs 4
Why Holley HP EFI vs others?
TPI retrofit kit makes it plug and play, contains all the harnesses, sensors etc
'Autotune' makes initial tuning easier
Price point
ability to control timing
ability to run sequential injection
Why Tanks Inc PA-4
in tank pumps tend to last longer and are quieter
Why TPI?
Lots of them available used
lots of aftermarket support/options
fits under the stock hood
driveability
Why not EZ-EFI or Holley Avenger TBI?
I figured if I was going EFI, I'd use a manifold designed for EFI.
carb look isn't important to me
8 injectors vs 4
Why Holley HP EFI vs others?
TPI retrofit kit makes it plug and play, contains all the harnesses, sensors etc
'Autotune' makes initial tuning easier
Price point
ability to control timing
ability to run sequential injection
Why Tanks Inc PA-4
in tank pumps tend to last longer and are quieter
04-13-2012, 10:21 AM
#20
Holley HP EFI w/TPI
Thread Starter
2500 was my target for the install
What about a distrinutor/ign how does that work out with that system?
1) No control, tach signal to ECU
2) Use TPI Dist, comes with plug, have ECU control timing
3) Use other locked/electronic dist, have ECU control timing
4) Crank trigger, have ECU control timing
Nothing preventing you from using #1, then switching later to 2-4
If the op is just using his 350 as a cruiser suppose thestock TPI will get him around fine.
If in search of a lot of power almost not worth it the runner length as a whole is the limiting factor.
They have great throttle response and torque on the street though.
If in search of a lot of power almost not worth it the runner length as a whole is the limiting factor.
They have great throttle response and torque on the street though.
Nothing to prevent me from changing to a better flowing setup in the future.
TPI + HP EFI leaves me with endless options
Last edited by moonsteel; 04-16-2012 at 11:19 AM.