what to expect from well built tpi.

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Jan 13, 2013 | 10:38 PM

Black88Z

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Joined: Nov 2011

Posts: 507

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From: Charlotte, NC

Car: 1988 IROC-Z Camaro, 1981 Trans Am

Engine: 350 TPI, 301 N/A

Transmission: 700r4, 350thm

what to expect from well built tpi.

I am trying to decide what intake setup to use, carb, tpi, and I've even been tossing around the idea of an lt1 intake swap.

What I would like to know is what can a tpi intake be built to handle? Can a tpi intake be built to support 350hp? 400? What is a modified tpis limitation? I know there are people who siamese the runners and port out the plenum intake manifold runners to the max to provided better airflow. I also know there are edelbrock and tpis runners which are one big oval shaped runner which will supply more airflow. What is the best way to get the most airflow?

For my build I am hoping to make power to 5500 but redline at 6k. Thanks

Jan 13, 2013 | 11:39 PM

vetteoz

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Joined: Apr 2005

Posts: 7,736

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From: Not in Kansas anymore

Car: 82 Z28

Engine: 383 SP EFI/ 4150 TB

Transmission: T400

Axle/Gears: QP 9" 3.73

Re: what to expect from well built tpi.

Quote:

Originally Posted by Black88Z

What I would like to know is what can a tpi intake be built to handle?
Can a tpi intake be built to support 350hp? 400? What is a modified tpis limitation?

some spare time reading , open a beer
https://www.thirdgen.org/forums/tech...yone-talk.html

Quote:

Originally Posted by Black88Z

I know there are people who siamese the runners and port out the plenum intake manifold runners to the max to provided better airflow. I also know there are edelbrock and tpis runners which are one big oval shaped runner which will supply more airflow.
What is the best way to get the most airflow?

Consider a HSR instead.
More potential and cheaper
https://www.thirdgen.org/forums/alte...-h-p-goal.html
https://www.thirdgen.org/forums/alte...-bolt-hsr.html
https://www.thirdgen.org/forums/tpi/...ds-should.html

Jan 14, 2013 | 12:17 AM

watajob

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Posts: 1,410

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From: Location, Location!

Car: 92 T/A 'vert

Engine: Mild .040 over L98 4 bolt mains

Transmission: Mostly stock 700R4, 2600 Vigilante

Axle/Gears: LS1 3.42

Re: what to expect from well built tpi.

Dyno Don and his group from SoCal are 100HP past me, emission legal, no less!

Attached Thumbnails

what to expect from well built tpi.-dyno-graph.jpg

Jan 14, 2013 | 08:27 AM

NufNuffZ28

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Joined: Dec 2000

Posts: 1,954

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From: NC

Car: 1987 Iroc

Engine: 357 Single plane and a Ysi vortech

Transmission: T56

Axle/Gears: 3.50 9"

Re: what to expect from well built tpi.

N/A a stock style T.P.I. will be hard to get over 300rwhp. And, that's with good heads, LTs, nice sized cam, etc.

For a budget TPI upgrade, port the base, siamese the plenum, and get some used SLP runners.(also port matched). Add spray and enjoy

Jan 14, 2013 | 08:33 AM

Orr89RocZ

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Joined: Sep 2003

Posts: 25,895

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From: Pittsburgh PA

Car: 89 Iroc-z

Engine: 555 BBC Turbo

Transmission: TH400

Axle/Gears: MWC 9” 3.00

Re: what to expect from well built tpi.

Over the years i think i have seen 300-350 whp with conventional long tube aftermarket tpi. Buttloads of torque tho. 400-500 lb ft. Thats some pep

Rpm limited in long tube design of current diameters on the market. To get much more power you need to either build bigger tubes and mate to custom enlarged base ($$$) or siamese runners to shorten things to gain rpm potential.

You are sucking air thru a long straw... Its easiest to suck thru a larger diameter straw if it has to be long or a very short straw.