Mod question
Thread Starter
Instructor
Joined: Jul 2006
Posts: 141
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From: New York
Mod question
I have a 98 convert with ls6/zo6 intake, longtube headers, high flow cats, X pipe and corsa on the back end. For CAI it's a pretty large K &N setup. I am taking the car to get re-tuned soon and my question is, will porting the TB do any good. The reason I ask is that I have heard/read that unless there are other mods to spark, fuel it could actually take away from A/F in turn taking performance away. Is this not true or is it true and will be something corrected by a new tune?
Advanced
Joined: Oct 2006
Posts: 76
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From: Austin, Texas
I have a 98 convert with ls6/zo6 intake, longtube headers, high flow cats, X pipe and corsa on the back end. For CAI it's a pretty large K &N setup. I am taking the car to get re-tuned soon and my question is, will porting the TB do any good. The reason I ask is that I have heard/read that unless there are other mods to spark, fuel it could actually take away from A/F in turn taking performance away. Is this not true or is it true and will be something corrected by a new tune?
Good Luck!
Thread Starter
Instructor
Joined: Jul 2006
Posts: 141
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From: New York
exactly the response i was looking for. i am goin to give my tuner a call next week to ask with my stock cam and head system combined with my aftermarket intake and exhaust if it makes sense to port the tb. If he says it go ahead it will make a difference, I hear Shaner is the guy but I also see perfomance shops doing it as well. Your opinion?
Former Vendor
Joined: Nov 2005
Posts: 8,995
Likes: 2
From: Spring Texas
St. Jude Donor '08
I have a Shaner TB. After being tuned in, it resulted in significantly better throttle response. It won't increase your peak power very much (if at all) but is will put some umph in your lower end if tuned properly. While you're there, you may also want to look at a new Mass Airflow Sensor Housing. They sell for $20-30 and have a similar effect as a ported TB again when properly tuned.
6th Gear
Joined: Nov 2001
Posts: 6
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From: johnstons river pei
Properly porting your throttle body will increase power, if you look you can see many after market products to improve air-flow from the airfilter to the heads. I have ported the throttle body on my 91 vette L-98 plus heads cam etc. It made a very noticable difference; just take your time with a carbide tiped die grinder, sand paper,band aids and 2-4 hours. Where you want to leave a little bit of a rough surface for fuel and air mixture is the intake port in the head (this is where the magic takes place). The smoother, shinier and cleaner the throttle body is the faster the air gets where it needs to be.
Pro
Joined: Sep 2003
Posts: 731
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From: Calgary Alberta
I have a Shaner S2 ported TB also. It made a huge difference in throttle response. I don't think it increased any HP (didn't think that it warranted a trip on the dyno), but it definitely made a difference in the throttle response. Mark Shaner does exquisite porting work!
Le Mans Master
Joined: Aug 2003
Posts: 9,298
Likes: 4
From: American Canyon Lethal Injection
I have a Shaner S2 ported TB also. It made a huge difference in throttle response. I don't think it increased any HP (didn't think that it warranted a trip on the dyno), but it definitely made a difference in the throttle response. Mark Shaner does exquisite porting work!
that's all you'll get..throttle respnse is much better...
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Thread Starter
Instructor
Joined: Jul 2006
Posts: 141
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From: New York
Good stuff. Thanks all! Going to go ahead and get the ported TB with Shaner and go for another tune to tie everything else I just added on together. Depending if I ever decide to go to the track or if my balancer decides to go (which ever comes first) going to go with an upgraded cam. Pretty much think I am done for now until I get the itch again. Have the headers for 3 weeks and already getting dirty looks from the parents on the block...
Melting Slicks
Joined: Sep 2002
Posts: 2,329
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The focus point is: "Will this improve over stock calibrations?" With the vette frequently this is "no." The ignition coils that are stock are more than adequate even to some extreme applications. The crankshaft and the rods and pistons that are stock will handle a great deal of abuse from "power adders" such as heads, cam, headers, torque converters,etc. If you look at the cars that are featured in GM tech performance magazine it is amazing how many of the mods list: "stock." Guys run 9 second cars with cranks,pistons, rods that are stock.
I have LS1 with 62cc chamber cnc'd heads with double gold springs;cam is 218/224 lsa115. Intake is LS6. Headers are 1 3/4" into Corsa exhaust. Rearend is Z06 3.42 with hardened shaft. Yank SS3600 high stall converter. Large oil pump and trans cooler -25% reduced undrive pulley;QA1 12 point adjustable shocks. Quarter mile is 11.8/117mph -
The current stock throttle is fine for this application -its parameters are more than enough for my application.
Another example is the 90mm throttle body and intake manifold - excellent hookup but my stock application carries all the air I can use.
I have LS1 with 62cc chamber cnc'd heads with double gold springs;cam is 218/224 lsa115. Intake is LS6. Headers are 1 3/4" into Corsa exhaust. Rearend is Z06 3.42 with hardened shaft. Yank SS3600 high stall converter. Large oil pump and trans cooler -25% reduced undrive pulley;QA1 12 point adjustable shocks. Quarter mile is 11.8/117mph -
The current stock throttle is fine for this application -its parameters are more than enough for my application.
Another example is the 90mm throttle body and intake manifold - excellent hookup but my stock application carries all the air I can use.
Instructor
Joined: Jan 2008
Posts: 122
Likes: 0
From: Forest Park Illinois
A ported throttle body will yield probably a 4-5hp gain. It will improve throttle response okay. You may want to consider a VR stack from Vararam for about $45bucks. Same result, do it yourself about 10 min.
Former Vendor
Joined: Nov 2005
Posts: 8,995
Likes: 2
From: Spring Texas
St. Jude Donor '08
I disagree. The velocity stack actually reduces the cross-sectional area of the intake at the throttle body causing restriction. Any "smoothing of airflow" gain is counteracted by a significant reduction in airflow.
Thread Starter
Instructor
Joined: Jul 2006
Posts: 141
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From: New York
ah man what did i start..lol i came in curious about a ported tb and now i am looking up vr stack and ported mafs.. the fact that the tb will make for a better experience is enough for me. thanks guys!