SLP Intake Runners?
Melting Slicks
Joined: Apr 2007
Posts: 2,616
Likes: 111
Well,
I am glad I went to the miniram......had the Edelbrock base, runners.....was happy to sell them.....made a nice truck engine though........engine made 296 rwhp......380rwtq.........that convinced me....
but some folks like the low end grunt and shift at 4500 RPM......still feels fast..........until someone blows your doors off at the track
I am glad I went to the miniram......had the Edelbrock base, runners.....was happy to sell them.....made a nice truck engine though........engine made 296 rwhp......380rwtq.........that convinced me....
but some folks like the low end grunt and shift at 4500 RPM......still feels fast..........until someone blows your doors off at the track
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,062
From: altered state
St. Jude Donor '05
Thats the trickery of TPI. Due to the throttle response of the long runner it feels faster than it is, Ive pulled plenty of cars good to the 1/8 mi mark only to have them suck my doors off on the last 1/8, poor car was simply out of breath and had nothing left for 3rd gear 
Still fun for a street cruiser up to about 40-50 though.
Still fun for a street cruiser up to about 40-50 though.
Melting Slicks
Joined: Apr 2007
Posts: 2,616
Likes: 111
Thats the trickery of TPI. Due to the throttle response of the long runner it feels faster than it is, Ive pulled plenty of cars good to the 1/8 mi mark only to have them suck my doors off on the last 1/8, poor car was simply out of breath and had nothing left for 3rd gear
Still fun for a street cruiser up to about 40-50 though.
Still fun for a street cruiser up to about 40-50 though.
same experience.....
Race Director
Joined: Nov 2003
Posts: 12,220
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
Thats the trickery of TPI. Due to the throttle response of the long runner it feels faster than it is, Ive pulled plenty of cars good to the 1/8 mi mark only to have them suck my doors off on the last 1/8, poor car was simply out of breath and had nothing left for 3rd gear
Still fun for a street cruiser up to about 40-50 though.
Still fun for a street cruiser up to about 40-50 though.
I'm speaking of MODIFIED mega-siamesed SLP runners (with matched plenum/base).
Race Director
Joined: Nov 2003
Posts: 12,220
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
Guys i uploaded it here
Right click, save target as, then open it
http://www.calderone-online.com/c4/tpi.mht
Right click, save target as, then open it
http://www.calderone-online.com/c4/tpi.mht
Melting Slicks
Joined: Apr 2007
Posts: 2,616
Likes: 111
Nice build you did by the way.....saw your original thread titled "it's alive" or something like that....nice video too......
but was just as impressive....that is one nice engine bay you have! great job getting that as clean as it is mean!
Le Mans Master
Joined: May 2007
Posts: 8,448
Likes: 27
From: Valparaiso
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Race Director
Joined: Nov 2003
Posts: 12,220
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
I see now. I opened it with an editor and see it's HTML code wrapped around the article.
So, if downloaded first, it opens the downloaded copy w/o any (subsequent) request to your server.
So, if downloaded first, it opens the downloaded copy w/o any (subsequent) request to your server.
Last edited by GREGGPENN; Sep 7, 2010 at 12:44 AM.
Race Director
Joined: Nov 2003
Posts: 12,220
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
Just to be clear, there's a large range of results you can have with SLP runners. In their stock form, there's not much difference from a stock TPI performance curve. It can only change signficiantly when porting/alterations are done. Like the "design 1" runners Chaos shows on page one,,,Or the cut/welded ones recently sold by Shifter,,,Or the ones I installed on my 383.....
With this level of porting, the car pulls VERY hard until 5k rpms. It hits very fast too. IOW, I'm also surprised at the low-end response (below 2500 rpms). Some of this is the 383 though. I probably could have gotten a bit more if I went further down with the siamesing.
Here is another good article that conveys the difference.
http://www.gmhightechperformance.com...roc/index.html
Last edited by GREGGPENN; Sep 7, 2010 at 12:36 AM.
Safety Car
Joined: Oct 2008
Posts: 4,022
Likes: 30
From: Los Angeles CA
Thank you very much!
Just to be clear, there's a large range of results you can have with SLP runners. In their stock form, there's not much difference from a stock TPI performance curve. It can only change signficiantly when porting/alterations are done. Like the "design 1" runners Chaos shows on page one,,,Or the cut/welded ones recently sold by Shifter,,,Or the ones I installed on my 383.....
With this level of porting, the car pulls VERY hard until 5k rpms. It hits very fast too. IOW, I'm also surprised at the low-end response (below 2500 rpms). Some of this is the 383 though. I probably could have gotten a bit more if I went further down with the siamesing.
Here is another good article that conveys the difference.
http://www.gmhightechperformance.com...roc/index.html
Just to be clear, there's a large range of results you can have with SLP runners. In their stock form, there's not much difference from a stock TPI performance curve. It can only change signficiantly when porting/alterations are done. Like the "design 1" runners Chaos shows on page one,,,Or the cut/welded ones recently sold by Shifter,,,Or the ones I installed on my 383.....
With this level of porting, the car pulls VERY hard until 5k rpms. It hits very fast too. IOW, I'm also surprised at the low-end response (below 2500 rpms). Some of this is the 383 though. I probably could have gotten a bit more if I went further down with the siamesing.
Here is another good article that conveys the difference.
http://www.gmhightechperformance.com...roc/index.html
Team Owner
Joined: Dec 2007
Posts: 20,974
Likes: 261
Well,
I am glad I went to the miniram......had the Edelbrock base, runners.....was happy to sell them.....made a nice truck engine though........engine made 296 rwhp......380rwtq.........that convinced me....
but some folks like the low end grunt and shift at 4500 RPM......still feels fast..........until someone blows your doors off at the track
I am glad I went to the miniram......had the Edelbrock base, runners.....was happy to sell them.....made a nice truck engine though........engine made 296 rwhp......380rwtq.........that convinced me....
but some folks like the low end grunt and shift at 4500 RPM......still feels fast..........until someone blows your doors off at the track
I would never go back to the LTR setup.As for the the old statement about torque monster with tall gears, no way! The 350 does not make enough to make up for it.
I like more rpms with lower gears.
Race Director
Joined: Nov 2003
Posts: 12,220
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
4300 is about where the stock setup dies. So I gained 500-700rpm ceiling (and a whole-lotta torque). Shorter siamesed tubes will go higher but not 5700 unless completely siamesed (like Shifter's). The FIRST is the only other long-tube setup that MIGHT get that high (in conjunction with porting).
Last edited by GREGGPENN; Sep 7, 2010 at 03:06 AM.
Le Mans Master
Joined: May 2007
Posts: 8,448
Likes: 27
From: Valparaiso
hi guys,were you able to see the article again ?
if not , let me know , i can convert it to PDF or jpg files posted here
in fact i remember that i have another TPI comparison article on a dvd somewhere
if not , let me know , i can convert it to PDF or jpg files posted here
in fact i remember that i have another TPI comparison article on a dvd somewhere
Safety Car
Joined: Oct 2008
Posts: 4,022
Likes: 30
From: Los Angeles CA
4300 is about where the stock setup dies. So I gained 500-700rpm ceiling (and a whole-lotta torque). Shorter siamesed tubes will go higher but not 5700 unless completely siamesed (like Shifter's). The FIRST is the only other long-tube setup that MIGHT get that high (in conjunction with porting).
http://forums.corvetteforum.com/sout...pi-engine.html
http://www.thirdgen.org/techboard/tp...owing-tpi.html
the real problem is with all the bases, they have material welded then redirect the contour , even then compared to a 2 barrel manifold it is smaller,and less aerodynamic, Kevin and Dyno Don say 100rpm gain for every inch of Siamese after the manifold trick. SLP's is about a foot long?
hence my q here:
http://forums.corvetteforum.com/c4-t...le-to-get.html
Last edited by slickfx3; Sep 7, 2010 at 11:50 AM.
Burning Brakes
Joined: Mar 2009
Posts: 830
Likes: 6
I have to ask, how does siamesing the runners help?
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,062
From: altered state
St. Jude Donor '05
Little more plenum area (so to speak) for the most part youre just shortening the runner some. IMO siamesing the plenum then the runners youre removing some restriction. Youd have to see some up close before and after to really get it.
Member here (know his name just not his handle) scored a set of Accell Runners and base used on Ebay for $400. Spent a little more on porting waiting for a dyno report when its running. Dont know where the ceiling will be but according to a build (identical) on 3rd gen the guy got 350rwp +- 180 afr head Comp 268 cam Dyno dons headers smog legal. Supposedly shifts at 6k Id guess it would be "done" much sooner
Heres some of the hackery done to the parts.
Dont have pics of the siamesing of the plenum. Hitting the front helps some not a whole lot on its own though like any TPI part. Little rough but its not that crucial. At the end of the day you can only do so much with a TPI its been done a million times but if youre stuck with it then why not...
Accel runners getting done all the way through
2 inch deep siamese
Accel base ported
Oops!
Member here (know his name just not his handle) scored a set of Accell Runners and base used on Ebay for $400. Spent a little more on porting waiting for a dyno report when its running. Dont know where the ceiling will be but according to a build (identical) on 3rd gen the guy got 350rwp +- 180 afr head Comp 268 cam Dyno dons headers smog legal. Supposedly shifts at 6k Id guess it would be "done" much sooner
Heres some of the hackery done to the parts.
Dont have pics of the siamesing of the plenum. Hitting the front helps some not a whole lot on its own though like any TPI part. Little rough but its not that crucial. At the end of the day you can only do so much with a TPI its been done a million times but if youre stuck with it then why not...
Accel runners getting done all the way through
2 inch deep siameseAccel base ported
Oops!
Team Owner
Joined: Oct 2004
Posts: 81,241
Likes: 3,062
From: altered state
St. Jude Donor '05
Who knows most go by dynos not track times unfortunately and they will all read a little different. Supposedly the SLP runner is a little shorter than the Accel dont know that for sure.