SLP Intake Runners?
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Joined: Aug 2010
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From: CALI
SLP Intake Runners?
after failing on my first mid america purchase (hyperjunk chip, air foil, tb spacers) i was wondering if anyone has found this mod useful? thanks for the replies, anything helps! =)
Team Owner
Joined: Oct 2004
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From: altered state
St. Jude Donor '05
They do best if they are heavily ported and some siamesing done;a similar base with work done will complement it. Check Ebay
Anything is better than stock though.If you were looking to bolt them on and feel a huge power increase you might be let down.
Anything is better than stock though.If you were looking to bolt them on and feel a huge power increase you might be let down.
Le Mans Master
Joined: Oct 2008
Posts: 9,758
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From: Houston Texas
Do this to your intake and runners and you will be in good shape.
http://www.gmtips.com/3rd-degree/dox...-port/port.htm
http://www.gmtips.com/3rd-degree/dox...-port/port.htm
Le Mans Master
Joined: Aug 2007
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From: WV
If your engine is stock, don't bother changing your intake, you can however port what you have on there now, it doesn't cost anything to port it except your time and the price of gaskets. You won't feel much difference unless your motor is upgraded , with stock motors (in my opinion) its not worth the money...WW
Last edited by WW7; Sep 5, 2010 at 12:35 PM.
Burning Brakes
Joined: Jan 2009
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From: Shepherdsville Kentucky
I only partially agree with WW7.
The most restrictive elements on the L98 are the intake components and exhaust. Opening up the intake/plenum/runners and tb coupled with better exhaust will produce significant gains for relatively little money. A retune of your chip is cheap and these changes play well with other mods later if you choose to make them.
The most restrictive elements on the L98 are the intake components and exhaust. Opening up the intake/plenum/runners and tb coupled with better exhaust will produce significant gains for relatively little money. A retune of your chip is cheap and these changes play well with other mods later if you choose to make them.
Le Mans Master
Joined: Oct 2008
Posts: 9,758
Likes: 49
From: Houston Texas
I only partially agree with WW7.
The most restrictive elements on the L98 are the intake components and exhaust. Opening up the intake/plenum/runners and tb coupled with better exhaust will produce significant gains for relatively little money. A retune of your chip is cheap and these changes play well with other mods later if you choose to make them.
The most restrictive elements on the L98 are the intake components and exhaust. Opening up the intake/plenum/runners and tb coupled with better exhaust will produce significant gains for relatively little money. A retune of your chip is cheap and these changes play well with other mods later if you choose to make them.
That the place to start intake and exhaust. If I wanted the most out of my stock L98 I would do an intake exhaust 1.6 RR and a tune.
Pro
Joined: Jun 2005
Posts: 581
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From: USA
I suspect 1.6RR would also require a valve spring swap.
IMHO, not sure if a larger TB is needed if you've still got the stock cam, even with intake, runners, plenum, LT headers.
I'm going through this right now myself.
91 L98, Edelbrock TPI base, SLP runners, ported plenum, and long-tube headers. 1.5RR (non-SA) with new guideplates & pushrods. I hogged out the SLP runners at the top where it mates with the plenum, and port-matched the lower side of the SLP runners to the Edelbrock TPI base. stock 113 heads.
I might do the 1.6RR (w/ springs) later on. right now just trying to get the car back on the road before it starts becoming a permanent fixture (garage queen).
IMHO, not sure if a larger TB is needed if you've still got the stock cam, even with intake, runners, plenum, LT headers.
I'm going through this right now myself.
91 L98, Edelbrock TPI base, SLP runners, ported plenum, and long-tube headers. 1.5RR (non-SA) with new guideplates & pushrods. I hogged out the SLP runners at the top where it mates with the plenum, and port-matched the lower side of the SLP runners to the Edelbrock TPI base. stock 113 heads.
I might do the 1.6RR (w/ springs) later on. right now just trying to get the car back on the road before it starts becoming a permanent fixture (garage queen).
Last edited by rpoL98; Sep 5, 2010 at 07:25 AM.
Race Director
Joined: Feb 2004
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Intake modifications should be addressed using a systems approach. If you are looking to bolt those runners on, and pick up seat of the pants performance, save your money. Gains may be possible on the dragstrip or dyno, but your butt dyno will feel nothing.
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Le Mans Master
Joined: Aug 2007
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From: WV
The OP didn't say he was going to replace his Manifold, or have his plenum reworked, or install headers. He ask if SLP runners were a useful modification. If installing the runners is all that he had in mind then my answer is correct. Porting and port matching the stock intake would give more in the way of performance then just adding SLP runners. I can tell you from the purchase I just made a few months ago , Plenum porting, high flow runners, Edelbrock intake and Hooker ceramic headers will run you $1,700 ... If I knew what I know now I would have done like Pete K told me before I put my intake together and just purchased a Super Ram or maybe a Mini Ram intake and been better off...Live and learn...
...WW
...WW
Last edited by WW7; Sep 5, 2010 at 12:59 PM.
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Drifting
Joined: Oct 2006
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From: Stafford Connecticut
Tpi
If tpi can't be made to work then what do you call the intake on top of the new Ls series of GM V8's?It sure isn't a super ram or a mini ram.The guys over on the Third Gen forum have been making great numbers with TPI intake systems.They use a ported stock plenum siamesed SLP runners and a ported Edlebrock intake,plus a proper tune.
Race Director
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If tpi can't be made to work then what do you call the intake on top of the new Ls series of GM V8's?It sure isn't a super ram or a mini ram.The guys over on the Third Gen forum have been making great numbers with TPI intake systems.They use a ported stock plenum siamesed SLP runners and a ported Edlebrock intake,plus a proper tune.
If you toss enough time, money and resource at something it will produce positive results?
I think anyone would agree with that, if done properly.
A ported plenum, ported base, and aftermarket runners are combined with a proper tune, you could spend anywhere for $500-$2000 bucks. Much more if writing a check to a shop for all of the work.
TPI has worked, and will continue to work for years. That is a fact.
It is normally more cost effective to swap out the manifold, using a full system approach. This assumes the ultimate goal is big power gains over stock. That is the subject for debate.
I have done it all. The most money I wasted to NOT achieve strong gains was to monkey around with the stock type, long length factory (or replacement) runners.
Drifting
Joined: Oct 2006
Posts: 1,328
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From: Stafford Connecticut
Tpi
I am sure most of us who have been working on Tpi long enough have seen the article from Comp Cams on the different intakes for our cars.If you go over the article you will see that the trade off is usually torque or horse power.A Mini ram new is not cheap.They don't make Super Rams any more so whats your point.So you missed something in your TPI build that you did not reach your goals for your motor.
Race Director
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I am sure most of us who have been working on Tpi long enough have seen the article from Comp Cams on the different intakes for our cars.If you go over the article you will see that the trade off is usually torque or horse power.A Mini ram new is not cheap.They don't make Super Rams any more so whats your point.So you missed something in your TPI build that you did not reach your goals for your motor.
Drifting
Joined: Oct 2006
Posts: 1,328
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From: Stafford Connecticut
Tpi
The Results from the article can be found at Third Gen.ORG.Look in the messages forum under TPI .Also check out the article in search of a better flowing TPI.They have to stick with Tpi because of Cali smog laws.I agree with your statement that it has to be a complete systems approach.Just bolting on one thing will not make a big difference.From the people I know who build things for fuel injection.The most efficient is a single plane setup.
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From: Overland Park Kansas
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Race Director
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From: Overland Park Kansas
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Le Mans Master
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From: Valparaiso
Right click, save target as, then open it
http://www.calderone-online.com/c4/tpi.mht