Going to be getting the ls6 intake and underdrive pulley soon was wondering what your thougths are on a ported t/b,worth it or not at this point mods are listed below

 

Definately worth it. Just port yours yourself for next to nothing. It's real easy, I've done 2 already. A couple hours of easy work for maybe 8 rwhp is worth it to me.

 

"for maybe 8 rwhp is worth it to me"

key word maybe...

i've yet to see an honest real world dyno showing those gains.

HONESTLY...the ls6 intake only gives 8-10hp...how can a 2mm wider tb give you 8hp??

if you are doing it yourself, yeah go for it. but to pay for it...nope. if anyting you'll probably notice more part throttle response. but wide open i don't think it increases flow enough to even come close to 8hp.

here is a pic of my tb that i ported myself using a lathe.

here is a diagram of why part throttle response increases.

 

Depends on your mods.

 

even heavily modded..

the TB is not the smallest part of the intake...

 

nice diagram you posted. you said you used a lathe to port the tb, can you use a hone like they use on drum brake wheel cylinders? where is the stop that everyone always seems to grind off?

 

not sure how a hone would work for it. there is a reasonable amount of material to remove. and the blade may get in the way of the hone.

there is a bump stop that prevents the blade from opening too far, sometimes this isn't adjusted right from the factory and doesn't open to it's full potential, basically never giving TRUE wide open throttle. but if you go too far the computer trips a code.

as soon as my father gets back from vacation (another month or so) he'll be opening up his machine shop again. he doesn't have any cores, so you'd have down time, but he'll machine off the lip in the TB for $50 + shipping

 

A friend used a porting tool on a drill, I've seen people use sanding drums or the flappers, and of course there are always Dremmel attachments. I'm going the Dremmel route.

From what I've seen/read the hp gains aren't a lot, but throttle response gets much better. If you do it yourself, its worth it IMO.

 

I bought a P+P'd TB. After all my parts installed, it makes for a very touchy throttle. The throttle response it excellent. IF i even tickle the thr. it responds like it never did before...

Get one from a scrap yard and have it done to eliminate the down time. Unless you don't feel like spending the extra $$$, that's understandable....


teke184- explain, what do you mean, "the TB is not the smallest part of the intake." - the intake ports to the head? enlighten me.........

 

the maf has a smaller cross-sectional area than the TB...

so increasing the size of the TB doesn't guarantee that you're gonna increase flow.

 

I was talking about the ls6 intake Results. There are posts of people hitting 25RWHPwith cam/header ls1's.

 

TB's and Intake manifolds are for power band gains, not total HP and TQ gains.

A ported TB might get you like 3hp, but across the board, you've got a much improved power gain. I've seen Shaner TB'd cars with dynos that displayed this. The power band picks up much sooner and isn't as steep. I'd say a ported/polished TB is an excellent investment for the price.

 

i got you rob...

as for
"There are posts of people hitting 25RWHPwith cam/header ls1's."

i think that is the far extreme of the curve.

the average for a bolt on car is about 10hp, probably 15 for cam/heads

one of the GM mags did a test of 5 intakes on a 420hp crate motor. i think the ls6, lsx and the truck intakes all gained within 1-2hp...resulting in about 8hp each compared to the stock ls1.
the BBK unit sucked and didnt' gain anything, but showed potential on the higher end, making it better for FI or big cubes.

so gaining 8hp (at the crank, not wheels) on a 400+ hp engine gives me serious doubts about gaining 25hp on an engine only slightly more powerful.

i also agree with crab....it's an across the board gain, not just peak.

 

QUOTE: key word maybe...

i've yet to see an honest real world dyno showing those gains.



Then so be it....I'll still take 3rwhp and better throttle response for free. You will here gains of 3-12rwhp depending on mods.

 

P&P TB is definitely worth it. Go for it!