just wondering if anyone knew the most hp a TPI with stock cubes has put out? and what parts were used.

 

What is your definition of TPI?

 

80's early 90s fbodies and vettes, either 305 or 350. just wondering what the highest numbers are on stock cubes. modified of coarse, so it will probably have like a holley stealth ram, aluminum heads, a big cam, long tube headers etc....

 

couple of guys here with stock bottom ends approaching around 400whp. Traxxion was in the 11's, and so are a few other guys here with aluminum heads/miniram type setups. Thats all motor


Sprayed/blown/turbo'd stuff has been well passed 11 second area. trbo355's turbo TPI setup made 730+whp and ran 9.3s I think

 

im not talking forced induction, that was what I thought, about 400.

 

Once the TPI intake is gone it is just another 350 SBC build
The fact is " was " a TPI is no longer of any relevance

 

We have to define TPI too.

Is the Mini Ram a TPI, well I guess to some extent. But for means of context when we talk TPI here I Think we mean the original GM style.

 

I didnt start this thread to compare lsx and tpi...there is no comparisson. I asked because I really wanted to know the limits of the tpi system.

 

Miniram/Stealth Ram/Ramjet/etc short runner type setups are not TPI... You may classify them as that way since they bolt in and can use TPI electronics but its not really a TPI intake. TPI is long tube runners and look like the factory style setup just with bigger tubes. Superram is using TPI base and resembles a TPI systems runners...so its still TPI.

To get the most out of TPI you need large siamesed runners and an extremely well ported base. Then the limit is just how high can you spin the stock bottom end. You can put 210 cc heads on it and try to cam it up...it will make big power if the TPI is supportive but the bottom end wont hold for long.

If you throw on a big single plane EFI setup thats ported out, then you should beable to make power to 8000 rpm on the right head setup but the bottom end would never survive. The bottom ends the limit on any motor really.

 

I have an LS1 Ported Stock heads/cam/longtubes/ls6 intake/ported throttle body/ pulley kit/ X pipe and modified catback on my 99 Corvette. It makes 417/417 at the wheels. I love it. I have a 69 Firebird 455 with Ported roundport heads/XHR288RPM/ 1 7/8 Long tubes/ large Holley Carb. It makes 358/360 at he wheels (automatic) and is a blast to drive as well. My lowly 89 Iroc 350 TPI makes 290/358 at the wheels and its just as much fun as the other two. It gets decent mileage and is pretty quick.
If done properly I am a big believer that a TPI still makes for a Great Street engine. I was surprised how easy it was to make the TPI work well. Just like several on this board have pointed out, if you are prepared to port and siamese the plenum/runners and port the base you can build a version of the TPI that will be a very satisfiing engine.

 

so im gonna assume my FIRST intake is still considered TPI right by your definition...?

 

FIRST is just bigger TPI so its still TPI. To me its the best bang for the buck TPI system available and I"m surprised not many run that intake. Its not any more expensive than a new aftermarket TPI with runners/base/throttlebody, and infact may be the same or cheaper depending what you get.

 

I agree. Also,,, every now and again the "original FIRST",,, an old AirSensors TPI,,, or when they sold the intake rights to Electromotive and they called it the IRS (they machined off the F and the T on the throttle body),, which they marketed as an "individual runner system" (IRS),,, will show up on eBay. They can be kinda difficult to find due to the way people list them, but that's how I bought the two that I have,, one with the original AirSensor electronics. In fact,, there is one listed right now (3 days left) as "AIR SENSORS TUNED PORT" with injectors and electronics (4" MAF, stand alone computer, and wiring harness) with a "best offer" option. There is also a company called Auto-nomics that still supports these old AirSensor systems and include replacement parts,, including the 4" MAF sensors for $200. http://www.auto-nomics.com/cgi-bin/s...q=all_products