grumpyvette Posted August 5, 2003 Share Posted August 5, 2003 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 largetube 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 stock 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 stock TPI 342 rear wheel hp is aproximatly equal to 427 flywheel HP FROM A 350 SBC ENGINE, figuring a 20% driveline loss rate. 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 link to c-4 stealthram Quote Link to comment Share on other sites More sharing options...
Guest the_dj Posted August 12, 2003 Share Posted August 12, 2003 Just letting you know I found this post very informative. It directly applies to my situation. One question: How much taller is the front of the corvette stealth ram plenum than the stock TPI? Quote Link to comment Share on other sites More sharing options...
David K Posted August 12, 2003 Share Posted August 12, 2003 I had a SuperRam that was going in my 89 IROC. I would be interested on seeing that on your list above. Maybe you already listed it, i might need to see pics to see if we are talking about the same thing. http://www.cruzinperformance.com/sbsuperram.html http://www.motorhead.com/class/prc/405/100168.jpg A few dyno tests. http://www.geocities.com/MotorCity/7610/dyno.htm Quote Link to comment Share on other sites More sharing options...
Guest the_dj Posted August 12, 2003 Share Posted August 12, 2003 The mini-ram looks like the LT1 intake. The stealth ram is pictured on the c-4 link he posted. The TPI looks like...well...a TPI. The superram was not used in the testing. Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted August 13, 2003 Author Share Posted August 13, 2003 read this article also http://www.gmhightechperformance.com/tech/0307htp_holleystealth/ when you look at the choices the upgrade to the HOLLEY STEALTH RAM GIVES YOU THE MOST FOR YOUR MONEY compare the airflow numbers CROSSFIRE INTAKE 190cfm per port runner (measured individually) TPI Runners (measured individually) Stock....................203.17 cfm ACCEL................242.02 cfm Extrude/ACCEL...275.83 cfm Super Ram (ported)............289.18 cfm Intake manifold with 3/8 inch radiused intlet .............................222.45 cfm Stock intake manifold with runner Stock....................198.72 cfm ACCEL................213.52 cfm Extrude/ACCEL....217.11 cfm Super Ram............220.67 cfm ACCEL Hi-Flow intake manifold with 3/8 inch radiused inlet.........251.51 cfm ACCEL Hi-Flow intake manifold with runner Stock....................215.83 cfm ACCEL................232.53 cfm Extrude/ACCEL....243.21 cfm Super Ram............240.24 cfm Extrude-Honed ACCEL Hi-Flow intake manifold with 3/8 inch radiused inlet ............................275.83 cfm Extrude-Honed ACCEL Hi-Flow intake manifold with ACCEL runner ............................266.94 cfm Edelbrock Performer RPM manifold (Stock)..................286.51 cfm Edelbrock Victor Jr. .............................275.24 cfm Runners (measured individually) HOLLEY STEALTH RAM Stock....................275 cfm HOLLEY STEALTH RAM ported..................298 cfm THE HOLLEY STEALTH RAM EFI INTAKE SYSTEM POTENTIALLY MAKES MORE TQ OVER A WIDER RPM RANGE AND SIMILAR or HIGHER PEAK HP THAN THE BEST OF THE OTHER CHOICES AVAILABLE AND WITH THE CUSTOM PLENUM IT FITS CORVETTES http://www.fasterdeals.com/garageindex.html 1985,1992,1996 vettes keep the rubber side down and the fiberglass off the guard rails Quote Link to comment Share on other sites More sharing options...
David K Posted August 13, 2003 Share Posted August 13, 2003 wow the stealth is upwards of 100cfm more than the stock tpi. 8) Now id like to see some #'s on a stock plenum with siamese runners. I had a set of those too, never got to install them. Quote Link to comment Share on other sites More sharing options...
grumpyvette Posted August 13, 2003 Author Share Posted August 13, 2003 DAVID, THE TEST WAS WITH A PORTED PLENUM/BASE/RUNNERS, not a STOCK PLENUM,ETC. http://www.eecis.udel.edu/~davis/z28/winter01/dyno/ "The TPI currently consists of 58mm TB, fully ported plenum, AS&M largetube runners, and highly ported Edelbrock base) " 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 the stock TPI makes 245hp PEAK http://www.ifrance.com/accf-sprtcar/corvette/specs/91.html Quote Link to comment Share on other sites More sharing options...
Guest the_dj Posted August 14, 2003 Share Posted August 14, 2003 I picked up over 30hp when I ported my siamesed my stock base and greatly siamesed my SLP runners. Even so, it doesn't even flow the amount of that edelbrock base. I'd probably pick up 60hp with the Holley, especially given my cam is bigger, my heads flow better, and my intake sucks more than the ones listed. Quote Link to comment Share on other sites More sharing options...
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