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Super Moderator
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Discussion Starter #1 (Edited)
I found this info and I figured you guys might like to look it over, now the first thing I want to point out is where the DATA came from. and KEEP IN MIND ITS REAR WHEEL HP AND The TPI INTAKE IN THE TEST consists of 58mm TB, fully ported plenum, AS&M large tube runners, and highly ported Edelbrock base WHICH MEANS ITS ALREADY MAKING AT LEAST 25HP-30HP MORE THAN A STOCK TPI INTAKE)


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

The engine was basically the same,in all the test except for the intake manifold, consisting of a ZZ4 crate motor, AFR190 heads, LT4 HOT cam, and SLP 1-3/4" SS headers. Trans is a 700r4 with a Vigilante 2800 stall converter. The Engine Control Module (ECM) was a '92 TPI stock ECM (MAP/speed-density) with a modified EPROM.

I HAVE GONE TRU AND WILL PICKED OUT THE IMPORTANT POINTS TO SAVE YOU TIME IN THE CHARTs AND GRAPHS ON THE SITE

TPI engine.....283 PEAK rwhp @4800rpm peak
AVG. TQ 291.5
AVG HP 269.5



miniram
303 PEAK rwhp @6200rpm peak
AVG. TQ 285.8
AVG HP 269.1
IT LOST 29 HP at 3800 rpm and MADE 48 MORE HP THAN THE extensively ported large runner TPI
at 6300 RPM


stealth ram
342 PEAK rwhp @6400rpm
AVG. TQ 319
AVG HP 300 it lost 28 hp at 3600 rpm BUT GAINED 66 HP AT 6600 RPM
over the extensively ported large runner TPI
342 rear wheel hp is approximately equal to 427 flywheel HP FROM A 350 SBC ENGINE, figuring a 20% driveline loss rate.
and 342 rear wheel hp is 97 hp more HP at the rear wheels than the stock engine was rated at!!!

the use of a longer duration cam and only measureing PEAK HP would tend to benefit the miniram and STEALTH RAM intakes to a MUCH GREATER extent than the TPI, THATS HOW claims of gains of 100hp are made for some intake combos, while its TRUE that you can make in excess of a HUNDRED EXTRA hp at 6600rpms is due more to the TPI not being able to flow air (LOSSES) keep in mind that a LARGER ENGINE DISPLACEMENT WOULD BENEFIT EVEN MORE from the steathram

[http://motors.fasterdeals.com/]link to c-4 stealthram[/url]


BTW heres an EMAIL I GOT LAST WEEK

Paul,

I just finished installing the Stealth Ram and your custom plenum on my 89 Vette. I always wanted something different when I opened the hood and now I have it. The performance is awesome!

I want to thank you for your efforts in making this a reality! I am very happy with your plenum and the end results. Feel free to use me as a reference if you would like.

Thanks again for your hard work!

John Dwyer
 

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El Teafive
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10,489 Posts
Couple Questions Grumpy

If I were to buy a HSR can I buy separate pieces and get a plenum from you? What does the plenum you make look like? How much?


Then one thing I would like to point out on the Data from that website, while it was th same motro with 3 different intakes, the cam may or may not have been matched well with each intake. So if you have a cam made to work well with the Larger runners, it may not be a good match tot he HSR or MR..
 
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