Track results of my intake work

[Guest the_dj]

As a few of you saw, I did a WHOLE bunch of porting on my TPI intake, siamesing the runners and almost 3 inches into the base. The car is VERY tame down low (less than 3000 rpm) making it exceptionally streetable for a change. Past 3000 rpm, all hell brakes loose right into the 6200rpm rev limiter. 8) I welcome the change. (Before, the range was 2000-4500rpm).

 

I got the chance to take the car to the track this weekend. The only difference between my previous best and the new one is the ported TPI intake (no new parts). Keep in mind this was all done on $70 225/60ZR16 Road Hugger street tires.

 

Previous best: 13.18 @ 105.1 mph

 

New:

 

R/T: 0.565 (best ever)

60': 1.974 (best ever)

1/8 mile: 8.24 (best ever)

1/4 mile: 12.74 (best ever)

1/4 mph: 109.75 (best ever)

 

I was very happy with this run. Based on weight and mph, I calculated a 44hp gain from the intake work. Not too shabby for $40 in parts.

[grumpyvette]

heres an interesting dyno comparing the TYPE OF MODS YOU DID, to the STEALTH RAMS LONGER AND BETTER DESIGNED INTAKE SYSTEM

 

NOTICE THE 66HP GAIN OVER AND ABOVE WHAT YOU GOT WITH THE SIAMESE INTAKE MODS

 

http://www.eecis.udel.edu/~davis/z28/winter01/dyno/dyno021105/webpage021105.html

[Guest the_dj]

grumpyvette, I'm really not trying to get on your case or make any sort of a big deal about this (I can't stress that enough).

 

Every time I mention something I'm doing with my TPI, and how I'm happy with the results, etc., you come back and post how the HSR is a better intake. There's no arguing that. Each time, I've also mentioned how it won't fit under my hood. Also, there's really no way I can get the money for the HSR for what's looking like over a year++.

 

What I'm saying is: I did a whole bunch of work on my car, and managed to pull a 44hp gain for only $40 which is what I had. I'm extremely pleased with the results, and these results are really all I'm expecting from the money I have available to put in.

 

If any of this turned out offensive or degrading, that's not what I meant by it all. You are welcome posting your info and links, and it is good info, but if I'm talking about results, and no questions are asked, I'd at least feel better if the capital letters and bold print was toned down.

 

Thank you,

Sam

[grumpyvette]

Im sorry if you think Im KNOCKING what you did, WHILE I do see why you might think that way, Im really not ,IM JUST TRYING TO POINT OUT I DID THE SAME MODS,SPENT LOTS OF TIME AND MONEY TESTING, Im just pointing out that after doing all those mods on my own corvette , that I found that they were a boost over the stock TPI the same as you did find! BUT the boost was not all that impressive compared to the boost I got with a fully ported base and SLP runners ported full length and siamese ported 3" into the upper runners, as that mod retains the ram tuneing effect.

I also am pointing out that after years of working with the TPI restrictions and porting several engines intake system,trying the super ram, and mini-ram and stealth ram , I found the stealth ram to be the best of the bunch by a WIDE margine, (BUT YOUR CORRECT IN STOCK FORM IT WON,T FIT UNDER A 1985-1996 corvette hoodline)

SO I DID SOMETHING ABOUT IT

now Im sure youll take this as Im trying to sell something and thats not totally incorrect BUT THATS NOT THE MAIN REASON IM POSTING THIS,THE MAIN REASON IM POSTING IS TO LET YOU GUYS SKIP YEARS OF TESTING AND GET A TPI THAT WILL FIT UNDER A 1985-1996 corvette hood(like the STOCK TPI INTAKE) THAT DOES POTENTIALLY PRODUCE LARGE HP GAINS DUE TO GREATLY REDUCED AIRFLOW RESTRICTION , RETAINS THE RAM TUNEING, AND REQUIRES LESS WORK,WITHOUT WASTING TIME AND MONEY, after all this is not even a corvette forum and 99% of you guys will opt for a stock stealth ram anyway

 

 

<b> HERES THE STANDARD HOLLEY® STEALTH RAM AT 10" PLUS IN HEIGHT ITS ABOUT 1/2" TO TALL TO FIT UNDER THE STOCK C-4 HOOD</b>

 

 

<b>LOTS OF TESTING SHOWS THAT POWDER COATING HELPS PREVENT CORROSION, and GREASY FINGER PRINTS UNLIKE BARE ALUMINUM, THIS IS A QUALITY PIECE</b>

 

(1) Designed to fit under the 1984-1996-corvette hood line,

 

(2) Powder coated for corrosion protection and no greasy finger prints

 

(3) This custom plenum is designed to give a significant boost to your TPI ENGINES ability to breath efficiently at higher rpm ranges

 

(4) Has a huge potential horsepower advantage due to a significant increase in air flow over even a ported Chevy tuned port injection intake manifold thus increasing the engines effective rpm range

 

(5) Mounts to a HOLLEY® STEALTH RAM ELECTRONIC FUEL INJECTION BASE, and uses the HOLLEY® fuel rails and either Chevy or aftermarket throttle body and injectors

 

(6) Adds a true custom fabricated high dollar race engine look and air flow potential to your engine

 

 

(7) Solid welded construction with no seams to leak, easily works with turbo or

Naturally aspirated or nitrous, while each engine combo will vary, this flows enough air to support well over 500hp

 

 

 

 

<b>heres the plenum just sitting on top of the HOLLEY® base(the mounting bolts are just screwed in part way AT ONLY 9" TALL IT FITS AND HAS THE POTENTIAL AIRFLOW TO BUILD AN ENGINE FAR OUT POWERING A STANDARD TPI</b>

 

(1) The combo of a HOLLEY® STEALTH RAM ELECTRONIC FUEL INJECTION BASE, not only adds a significant potential horsepower gain due to its greater airflow, it makes both maintenance of the injectors and the removal of the intake manifold far faster and easier,(a big advantage on a racing engine based on the Chevy TPI style ELECTRONIC FUEL INJECTION SYSTEM ) unlike the stock Chevy TPI the custom stealth ram and plenum can be removed with far less disassembly time, fewer parts and has greater access to those parts plus a far straighter and less restricted path for that air flow into the cylinders

 

(2) Now you can add the custom PLENUM to the HOLLEY® and fit it under the stock 1985-92 L-98 corvette hoods

(3) Comes with step by step mounting instructions, bolts, and performance helpful hints

 

 

this is a custom welded plenum, similar to the ones the pros pay $2500 and up for from the custom builders. now the HOLLEY® STEALTH RAM PLENUM flows far better than the stock TPI but IT WON,T FIT UNDER THE STOCK HOOD LINE ON A C-4 CORVETTE,

there were a few ways I found to improve things in the tight C-4 engine compartment

(1)the plemum is slightly longer and much lower than the HOLLEY CAST PLENUM

(2)THE THROTTLE BODY IS ANGLED SLIGHTLY DOWNWARD FOR BETTER HOOD CLEARANCE

 

(3)THE THROTTLE BORES ARE LARGER THAN A STOCK TPI FOR MUCH BETTER AIR FLOW.

 

(4)AIR IN A STOCK TPI MUST CHANGE DIRECTIONS OVER 270 degrees AFTER IT PASSES THROUGHT THE THROTTLE BODY, THIS CUSTOM PLENUM AND STEALTH RAM BASE REDUCES THE DIRECTIONAL CHANGES TO ABOUT 1/3 OF THAT OR ABOUT 100 DEGREES.

 

(5)THE STOCK TPI FLOWS ABOUT 200cfm LIMITING POTENTIAL AIR FLOW AND THE ENGINES EFFECTIVE RPM RANGE, THE COMBO OF THE HOLLEY STEALTHRAM BASE AND CUSTOM PLENUM ALLOWS A MAJOR INCREASE IN EFFECTIVE RPM RANGE (RESULTS VARY WITH YOUR COMBO OF COURSE)

 

(6)THE INTERIOR SUPPORT TUBES FOR THE MOUNTING BOLTS are MUCH THINNER

 

(7)the REAR OF THE PLENUM IS SLIGHTLY ANGLED TO HELP REDUCE INTERIOR TURBULANCE

 

(8)THE INTERIOR SURFACES ARE SMOOTHER

 

(9)THE FITTINGs FOR THE SENSORS ARE MOVED TO AREAS OF NON-CRITICAL AIRFLOW AND SEATED SLIGHTLY FURTHER OUT TO REDUCE TURBULANCE IN THE PLENUM INTERIOR

 

(10)THERES MUCH MORE ROOM FOR WORKING ON THE DISTRIBUTOR AS THERES NO FITTINGs MOUNTED ON THAT TIGHT REAR SURFACE

 

(11)THEREs NO UPPER DECORATIVE RIBS TO INCREASE THE PLENUMS SURFACE AREA,(ALLOWING IT TO MORE QUICKLY ABSORB ENGINE COMPARTMENT HEAT LIKE THE STANDARD PLENUM) or to collect dirt

 

(12)THE PLENUM IS POWDER COATED TO PREVENT CORROSION AND FINGER PRINTS AND MAKE CLEANING EASIER

 

(13)PROVISIONS HAVE BEEN MADE FOR A FUTURE KIT TO FIT THE 9TH COLD START INJECTOR

 

 

WANT a custom plenum ? $249.95 + $20 S&H

call 1-561-798-9067 for details on ordering

and this is just a service to fellow hotrodders, I contracted for several dozen to be made and at that price Im just clearing about $20 on each of them, if they sell , Ill make more, and maybe make a profit, but as it is Ive spent 7 months getting it correct with far less than $500 in potential profit if I sell ever one I had built!

[ToplessZ]

Hey cool info grumpy. Think that will fit under a z hood. Not a bad price for what you are getting either.

[Guest the_dj]

Hey cool info grumpy. Think that will fit under a z hood. Not a bad price for what you are getting either.

 

Should fit: it's only 3/8" taller than my TPI that fits fine

 

Only holdup is the cost.

 

Sam

[ToplessZ]

just future planning right now thats always free

[DavyZ]

As a few of you saw, I did a WHOLE bunch of porting on my TPI intake, siamesing the runners and almost 3 inches into the base. The car is VERY tame down low (less than 3000 rpm) making it exceptionally streetable for a change. Past 3000 rpm, all hell brakes loose right into the 6200rpm rev limiter. 8) I welcome the change. (Before, the range was 2000-4500rpm)...Not too shabby for $40 in parts.

 

 

Absolutely beautiful for a bit of time & very little money spent!!! I wish I had the money for all the new fancy EFI stuff, but I don't. I surely can relate to your ingenuity and resourcefulness. GOOD JOB!!

 

Davy

[Guest zfan]

Sam/DJ, How much are the complete TPI systems going for? Reason I'm asking is I am currently running a Holley 750 dp and Weiand stealth dual plain intake and would love to go fuel injected.

 

I just don't have a lot of money to go out and run Holley projection or something like that. My 355 is not real wild, 10.3 to 1, 230 duration roller cam and Edelbrock rpm aluminum heads.

 

Mike