SLP Intake Runners?
Race Director
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
Also, as Slick pointed out in this thread, the stock/aftermarket TPI bases have a limitation in the way their final turn (into the head) pinches air flow. If you want maximum HP, a stock-style TPI intake isn't the right one for you. It's for torque junkies.
Last edited by GREGGPENN; Oct 19, 2010 at 02:25 AM.
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
In light of that, the answer to the original question "[is] this mod useful?"
NO. Not on a stock or stockish engine that is going to stay stockish. For the price of the SLP runners ($300+) there are more effective things that can be done, IMO.
Instructor
Joined: Dec 2005
Posts: 142
Likes: 2
From: Centerport NY
SLPs
I have done the mods. (1990 , A4, 3.07 axle) in the attached photos and they work really well in the mid to high RPM ranges. There is a definite improvement over the stock setup.
Along with the SLPs, going with the K&N filter, dialed up fuel pressure, cat back exhaust ( I have Magnaflow), tossed frisbee, TB bypass and the PCM custom chip, the car runs great.
You will not see dramtic improvements without a heads cam package however. I understand that this is bit of a crap shoot with aftermarket parts when it comes to emissions. I don't have OBD II and it would be difficult to predict the outcome on emissions. This is a problem where I live in New York. If anyone knows different, or has gone with a heads cam package on an L98 that has not had an emissions issue, I'd love to hear from you.
Flatbush 862
Along with the SLPs, going with the K&N filter, dialed up fuel pressure, cat back exhaust ( I have Magnaflow), tossed frisbee, TB bypass and the PCM custom chip, the car runs great.
You will not see dramtic improvements without a heads cam package however. I understand that this is bit of a crap shoot with aftermarket parts when it comes to emissions. I don't have OBD II and it would be difficult to predict the outcome on emissions. This is a problem where I live in New York. If anyone knows different, or has gone with a heads cam package on an L98 that has not had an emissions issue, I'd love to hear from you.
Flatbush 862
Burning Brakes
Joined: Mar 2009
Posts: 830
Likes: 6
[QUOTE=flatbush862;1575667030]I have done the mods. (1990 , A4, 3.07 axle) in the attached photos and they work really well in the mid to high RPM ranges. There is a definite improvement over the stock setup.
Along with the SLPs, going with the K&N filter, dialed up fuel pressure, cat back exhaust ( I have Magnaflow), tossed frisbee, TB bypass and the PCM custom chip, the car runs great.
What is a tossed frisbee?
Along with the SLPs, going with the K&N filter, dialed up fuel pressure, cat back exhaust ( I have Magnaflow), tossed frisbee, TB bypass and the PCM custom chip, the car runs great.
What is a tossed frisbee?
Race Director
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
There's a big round piece of metal bolted to the waterpump. Some people remove it for rotational weight savings. Most find it a satisfactory mod. A few select people notice a vibration when the A/C is turned on. (That add'l rotational mass was designed to stabilize the engagement of the A/C clutch.)
No doubt a seach on the word frisbee would have revealed this tidbit.
No doubt a seach on the word frisbee would have revealed this tidbit.
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Team Owner
Joined: Oct 2004
Posts: 81,241
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From: altered state
St. Jude Donor '05
Whole intake system yes youll feel it. Wont be a HUGE difference but you will notice it.
Descreening your MAF is a complete waste of time and you risk damaging it found that out the hard way.In short fried the head gaskets causing it to run lean intermittently. The whole time it seemed to "run fine" as you hear so many say (when the subject of tuning comes up)
Well it wasnt fine.
Intake will not affect emissions other than the visual part of it.
it just moves air.
Descreening your MAF is a complete waste of time and you risk damaging it found that out the hard way.In short fried the head gaskets causing it to run lean intermittently. The whole time it seemed to "run fine" as you hear so many say (when the subject of tuning comes up)
Well it wasnt fine.
Intake will not affect emissions other than the visual part of it.
it just moves air.
Race Director
Joined: Sep 2003
Posts: 16,836
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From: Database Error Indiana
You may get .2 at the dragstrip. Wont even feel it on the street.
Race Director
Joined: Nov 2003
Posts: 12,221
Likes: 446
From: Overland Park Kansas
2020 Corvette of the Year Finalist (appearance mods)
C4 of Year Winner (appearance mods) 2019
Unless shortblock has been modded, don't descreen your MAF. It won't help enough to notice. Bigger chance it could hurt -- and require retuning. The intake swap should be good to go.
Thread Starter
Advanced
Joined: Aug 2010
Posts: 57
Likes: 0
From: CALI
[QUOTE=Tom400CFI;1575667010]It appears to me that the OP is looking for an "easy bolt-on" that reaps some tangible gains. Look that the other parts he's tried above. I doubt that lower's, extensive porting, etc are in this posters near future.
with my TPIS base in the mail, and my plenum and runners in the process of being removed to be sent out and ported, I am proud to denounce your future prediction, although I appreciate your input.
with my TPIS base in the mail, and my plenum and runners in the process of being removed to be sent out and ported, I am proud to denounce your future prediction, although I appreciate your input.
Thread Starter
Advanced
Joined: Aug 2010
Posts: 57
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From: CALI
Hey guys. My updated build log kinda got lost in my "TPIS BIGMOUTH COOLANT...HELP" thread. thanks for all the input guys. this thread really gave me an idea on how i can build a stronger tpi engine
Le Mans Master
Joined: Feb 1999
Posts: 6,470
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From: levittown pa. usa Even a bad day with my `Vette, is better than a good day at work
St. Jude Donor '10
So what is your point?
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.
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.
