Tuned port fuel injection

kakx · 16th April 2004, 17:52

Is TPFI(Tuned Port Fuel Injection) the same as MPFI ??

GTO · 16th April 2004, 19:07

The best part about team-bhp is that I am continously refreshing my memory about all things automotive, while at the same time learning so much from everyones knowledge sharing.

If I remember correct, General Motors had marketed the term "tuned port fuel injection" way back in the 80's for use on their high performance cars. While it was basically very similar to the multi-point fuel injection systems, tuned port fuel injection basically had longer intake runners which resulted in awesome low-end torque.

Hope that helps,

GTO

Rtech · 16th April 2004, 19:53

learn something new everyday....thanks GTO!

Domnic · 17th April 2004, 00:10

hey as GTO said,
Its a GM trademark... you can find info on these systems in a book called how to build intake & exhaust systems.

TPFI or commonly known as TPI (Tuned Port Injection) works just like headers... you can reduce or increase the intake runner length to tune the power band .. bring it down or up (rpm) but these engines tend to lack high end power.
MPFI on the other had has the injectors placed directly in an angle over the intake valves.

I think the camaro does have a tuned port.

Cheers
DOm

GTO · 17th April 2004, 14:37

Quote:

Originally Posted by [b

Quote[/b] ]I think the camaro does have a tuned port.

Correct, I have seen numerous Camaros in the united states with the tpfi logo on them. Also, I believe there was a generation of Corvettes with the tpfi

GTO

16th April 2004, 17:52	#1
kakx BHPian Join Date: Apr 2004 Location: Mumbai Posts: 41 Thanked: 0 Times	Is TPFI(Tuned Port Fuel Injection) the same as MPFI ??
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16th April 2004, 19:07	#2
GTO Team-BHP Support Join Date: Feb 2004 Location: Bombay Posts: 71,859 Thanked: 321,651 Times View My Garage	The best part about team-bhp is that I am continously refreshing my memory about all things automotive, while at the same time learning so much from everyones knowledge sharing. If I remember correct, General Motors had marketed the term "tuned port fuel injection" way back in the 80's for use on their high performance cars. While it was basically very similar to the multi-point fuel injection systems, tuned port fuel injection basically had longer intake runners which resulted in awesome low-end torque. Hope that helps, GTO
	() Thanks

16th April 2004, 19:53	#3
Rtech Team-BHP Support Join Date: Apr 2004 Location: Bombay Posts: 5,765 Thanked: 371 Times View My Garage	learn something new everyday....thanks GTO!
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17th April 2004, 00:10	#4
Domnic Senior - BHPian Join Date: Mar 2004 Location: bangalore Posts: 427 Thanked: 6 Times	hey as GTO said, Its a GM trademark... you can find info on these systems in a book called how to build intake & exhaust systems. TPFI or commonly known as TPI (Tuned Port Injection) works just like headers... you can reduce or increase the intake runner length to tune the power band .. bring it down or up (rpm) but these engines tend to lack high end power. MPFI on the other had has the injectors placed directly in an angle over the intake valves. I think the camaro does have a tuned port. Cheers DOm
	() Thanks