TPI Runners
Thread Starter
Racer
Joined: Jun 2007
Posts: 367
Likes: 0
From: Springfield MA
TPI Runners
I what to swap my stock runners (suggested mod). Anyone have some really good brand? I don't want to sacrifice my stock look, so no mini ram,ect.
Also lower manifold?
Also lower manifold?
Last edited by rube1975; Jun 28, 2007 at 07:08 PM.
Pro
Joined: Mar 1999
Posts: 678
Likes: 0
From: Oslo, Norway
I have bought runners from TPIS and they loo super and flow much better than stock. Just state your corvette year and they send the right ones. I detected that the falloff of power was moved soem hundred rpms upwards
Advanced
Joined: Jul 2005
Posts: 62
Likes: 0
From: Ocean NJ
Burning Brakes
Joined: Aug 2005
Posts: 1,172
Likes: 9
From: '88 TPI L98/HotCam Powell, Ohio
Good luck getting the TPIS/AS&M runners. Unless they started making them again you will get the "back order" song and dance until you give up and move on.......
I have the Accel(Lingenfelter) runners that have a ton of material to port and they seem to work pretty well.
I have the Accel(Lingenfelter) runners that have a ton of material to port and they seem to work pretty well.
Pro
Joined: Jun 2007
Posts: 577
Likes: 0
From: the best car on earth ,vettes are best
how about this one guys
they have a awsome runner set up.
bit pricey, but a nice set up.
regards
shae
Last edited by emo-vet; Jul 1, 2007 at 03:27 AM.
Le Mans Master
Joined: May 2000
Posts: 7,033
Likes: 12
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
Team Owner
Joined: Sep 2001
Posts: 62,097
Likes: 1,724
From: Athens AL
C7 of the Year - Unmodified Finalist 2021
C4 of Year Finalist (performance mods) 2019
Best thing to do is port the plenum, then buy some AS&M runners and port those, and buy a TPiS or Accel base.
Le Mans Master
Joined: Jul 2001
Posts: 6,252
Likes: 2
From: Silicon Valley Kalifornia
Race Director
Joined: Aug 2000
Posts: 14,130
Likes: 7
Cruise-In II Veteran
Edelbrock runners look the best!Completes the look of the TPI way better than stock looking large tubes.
Anyways,no larger runners is going to change your engines power much until you get inside the engine first.5-10 Hp,If youre LUCKY,for around 350-500 bucks isnt ideal to me.An exhaust system change is better for the money.
So be sure you want to spend the money on them large runners.
While the larger runners can flow more air due to size,the stock engine is already being fed enough air with the stock tubes,albeit a low rpm cut off...its the runner LENGTH of the TPI system that holds it back.Thats why alot of modified engines end up with the SR,MR or a different intake set up.They are shorter in design.
I also agree with Vader about the porting/ intake change mods for best results with the system.Then youre gonna be out alot of money though for a few more ponies.
Maybe wait and see if BBK comes though with their new TPI set up and see if it delivers an increase in power for the money spent.
Race Director
Joined: Aug 2000
Posts: 14,130
Likes: 7
Cruise-In II Veteran
I tried SLP runners,and lost SOTP feeling but the power was moved in a later rpm band,not by much though.These had no real gains in a magazine test though.I went back to stock.
If youre spoiled by your engines "torquey" feel off the line,changing the intake system on a stock engine might make it "feel" slower to you,unless you race at the 1/4 mile all the time and want to see every few tenths you can gain at the track.
Safety Car
Joined: Mar 2005
Posts: 4,723
Likes: 11
From: Winnipeg Manitoba, Canada
I havent dynoed the car yet, but I plan on doing it soon. I won't have a hp comparison between stock and the Edelbrock runners because the whole engine was rebuilt.
Melting Slicks
Joined: Jan 2001
Posts: 2,940
Likes: 5
From: Chesapeake VA
Bill's comments are dead on from my experience. I also have an 86'. I put on TPIS long tube headers, and later their base manifold, runners and had them port my plenum.
I tried to get a base line dyno, but some crazy vette broke the dyno 5 cars before my pull!
After I installed the headers and a high flow cat, I pulled 213.5HP and 309.0 Lb/Ft. After the intake swap the numbers were 230.0HP and 326.9 lb/Ft on the same dyno.
As Bill stated, I did feel like I lost a little off the line torque, but I gained power above 3000RPM noticably.
Had I known the $/HP ratio was going to be like this, I probably would have looked more closly at a miniram, heads and cam setup. I am not saying the mods are bad, they do improve things, but it's quite a bit of money for a few HP.
I tried to get a base line dyno, but some crazy vette broke the dyno 5 cars before my pull!
After I installed the headers and a high flow cat, I pulled 213.5HP and 309.0 Lb/Ft. After the intake swap the numbers were 230.0HP and 326.9 lb/Ft on the same dyno.
As Bill stated, I did feel like I lost a little off the line torque, but I gained power above 3000RPM noticably.
Had I known the $/HP ratio was going to be like this, I probably would have looked more closly at a miniram, heads and cam setup. I am not saying the mods are bad, they do improve things, but it's quite a bit of money for a few HP.
Last edited by Square; Jun 29, 2007 at 10:31 AM. Reason: spelling
Instructor
Joined: Jul 2006
Posts: 150
Likes: 2
I like the SLP's best. They have the most material available to remove ! LOL ! You can also siamese them further than SLP does. This lets you rev higher. I have run or had in my hands all the aftermarket runners currently available. The quality control is garbage on the SLP but it's not much worse than anybody else. Check out my website to see what can be done with the SLP's and your plenum: Corvetteplenum.com
Also, Like it says in previous posts. Don't expect it to turn from a dog into a scalded cat with just a few bolt-ons. A base is almost certainly mandatory. Cam is a REAL step toward making good horsepower.
Mike
Also, Like it says in previous posts. Don't expect it to turn from a dog into a scalded cat with just a few bolt-ons. A base is almost certainly mandatory. Cam is a REAL step toward making good horsepower.
Mike
Pro
Joined: Jun 2007
Posts: 577
Likes: 0
From: the best car on earth ,vettes are best
Not So Actually....
www.firstinjection.com
this intake is a tpi on steroids.
regards
shae
Last edited by emo-vet; Jul 1, 2007 at 03:23 AM.
Pro
Joined: Jun 2007
Posts: 577
Likes: 0
From: the best car on earth ,vettes are best
hello mike,yep you are rite about that,expensive!
$ 999.00 complete,but still well worth it.
base,runners,plenum,70 mm single mono blade throttle body.
and none of these parts are interchangeble with other type tpi systems.
regards
shae
Last edited by emo-vet; Jul 1, 2007 at 03:26 AM.
Instructor
Joined: Nov 2005
Posts: 210
Likes: 0
From: fall river MA
i like the slp's my self. out of the box they are terrible. but i opened mine up and siamesed about 3/4 of the way down the runner. then patch welded it up. my runners now measure 1.75 in. inside diameter.
Advanced
Joined: Mar 2006
Posts: 99
Likes: 0
From: Mesa AZ
AS&M Runners
I'm currently running AS&M runners with an Accel Base on my '90. They are going to be replaced with a SR, etc. I purchased here from Kwik88 but I wasn't going to do that until August. Are you interested? Can you wait? If you are interested let me know. I'll get part numbers & pricing. I'm in AZ near Exotic Muscle. Good luck with your search.