ported ls2 tb?
Thread Starter
Burning Brakes
Joined: Sep 2008
Posts: 899
Likes: 18
From: Austin Texas
ported ls2 tb?
I am about to install a mamo ported fast 90 on my h/c car and I was wondering if it was worth the time to port the ls2 tb im putting on. How much if any power increase will a ported tb give me over an unported one?
Former Vendor
Joined: Mar 2004
Posts: 1,518
Likes: 7
From: Valencia CA
Probably one of the best SOTP mods for the dollar spent....if every couple of hundred you spent felt this noticeable you would likely have alot more money invested in mods.
It has a sizable increase in the responsiveness of the engine and usually adds 4-7 RWHP....a nice increase for the money spent but the additional response is worth the admission fee in and of itself.
PM me if you need some help with the TB....Ive done quite a few and can give you a responsive unit that your tuner can still work with....its easy to over port a TB if you dont know what your doing (and Ive seen just the opposite where a customers "ported TB" looked like it was sandrolled for the most part....I take quite a bit of material out of the LS2 units).
-Tony
It has a sizable increase in the responsiveness of the engine and usually adds 4-7 RWHP....a nice increase for the money spent but the additional response is worth the admission fee in and of itself.
PM me if you need some help with the TB....Ive done quite a few and can give you a responsive unit that your tuner can still work with....its easy to over port a TB if you dont know what your doing (and Ive seen just the opposite where a customers "ported TB" looked like it was sandrolled for the most part....I take quite a bit of material out of the LS2 units).
-Tony
Race Director
Joined: Sep 2005
Posts: 11,060
Likes: 291
From: Pasco WA
The LS2 90 unit won't fit a LS6 manifold. 4 mounting bolts,instead of 3, for one thing. TPIS makes a modified LS6 mani with a new snout that enables using a LS2 TB, but you won't get the gains of a FAST90-102/combo, especially ported. Porting the TB won't give you great power gains, but it'll improve drivability, and throttle response, at the expense of being harder to tune.
Racer
Joined: Feb 2008
Posts: 410
Likes: 0
From: Topeka KS
I used sanding rolls on mine but with coarse grit prior to the medium and fine rolls and ended up taking out a LOT of material from mine.
Former Vendor
Joined: Mar 2004
Posts: 1,518
Likes: 7
From: Valencia CA
Sanding rolls is for finishing work....essentially to remove the marks left from your carbide cutters (I use course and then finer flute carbides before I take out the sandrolls).
I liken it to paint work.....you use sandpaper to knock down all the orange peel of the fresh paint and then compound and a wheel to remove the sanding scratches from the paper to bring up the shine. Sure....you could do it all with compound and a wheel but it would take forever and honestly the results wouldn't be as good (paint not as "flat").
There are area's in that TB I remove over a quarter inch of aluminum....an aggressive carbide cutter is mandatory to cut it neatly in a reasonable amount of time.
And yes....an LS2 TB will not fit on the old school LS1 and LS6 intakes....only the LS2 OEM intake (which is a waste of time) and the FAST intakes which is the preferred intake for most performance applications.
-Tony
Melting Slicks
Joined: Sep 2003
Posts: 2,458
Likes: 105
From: Northville Michigan
Probably one of the best SOTP mods for the dollar spent....if every couple of hundred you spent felt this noticeable you would likely have alot more money invested in mods.
It has a sizable increase in the responsiveness of the engine and usually adds 4-7 RWHP....a nice increase for the money spent but the additional response is worth the admission fee in and of itself.
PM me if you need some help with the TB....Ive done quite a few and can give you a responsive unit that your tuner can still work with....its easy to over port a TB if you dont know what your doing (and Ive seen just the opposite where a customers "ported TB" looked like it was sandrolled for the most part....I take quite a bit of material out of the LS2 units).
-Tony
It has a sizable increase in the responsiveness of the engine and usually adds 4-7 RWHP....a nice increase for the money spent but the additional response is worth the admission fee in and of itself.
PM me if you need some help with the TB....Ive done quite a few and can give you a responsive unit that your tuner can still work with....its easy to over port a TB if you dont know what your doing (and Ive seen just the opposite where a customers "ported TB" looked like it was sandrolled for the most part....I take quite a bit of material out of the LS2 units).
-Tony
Tony did mine and it changed my Z06 from a stumble off idle situation to a very responsive tip-in.
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Racer
Joined: Feb 2008
Posts: 410
Likes: 0
From: Topeka KS
While Im sure its possible. it would take forever to remove the necessary amount of material needed to leave you with a much higher flowing more optimized piece....there is a pile of aluminum on my workbench just completing a single LS2 TB.
There are area's in that TB I remove over a quarter inch of aluminum....an aggressive carbide cutter is mandatory to cut it neatly in a reasonable amount of time.
-Tony
There are area's in that TB I remove over a quarter inch of aluminum....an aggressive carbide cutter is mandatory to cut it neatly in a reasonable amount of time.
-Tony
If I had carbide cutters then believe me that's the route I would go but using coarse sanding rolls (a couple of them) definitely works as well. It took a while especially in the fat area but like you said these things are aluminum so it's not THAT hard to remove material - I had a pretty big pile of aluminum on my bench as well. I just didn't feel the need to pay to have mine ported when I've done several LS1 TBs on my own for others and now an LS2 on my vette. I'm no expert at this and someone like you would likely get better results but if I can get 80% of the performance for 20% of the cost then I'm all for it - I might be leaving 1 or 2 HP on the table which is fine by me.
Thread Starter
Burning Brakes
Joined: Sep 2008
Posts: 899
Likes: 18
From: Austin Texas
I went ahead and did mine today. I did like Tony said and started with a carbide bit and went with sanding rollers then some fine sand paper to finish up. It turned out pretty nice. I took out a good amount of material but I'm no sure if it would be close it a Mano port job, I didn't take out a quarter inch from anywhere. It took about 30 min but it didn't cost anything. There is still a small ridge a little before the throttle plate because I wasn't sure if I was supposed to remove it completly. I hope that doesn't kill the flow. Thanks for the input.
Last edited by Nate B; Jun 30, 2010 at 08:05 PM.
Former Vendor
Joined: Mar 2004
Posts: 1,518
Likes: 7
From: Valencia CA
I went ahead and did mine today. I did like Tony said and started with a carbide bit and went with sanding rollers then some fine sand paper to finish up. It turned out pretty nice. I took out a good amount of material but I'm no sure if it would be close it a Mano port job, I didn't take out a quarter inch from anywhere. It took about 30 min but it didn't cost anything. There is still a small ridge a little before the throttle plate because I wasn't sure if I was supposed to remove it completly. I hope that doesn't kill the flow. Thanks for the input.
It only takes a little extra material removal in the wrong spot to ruin your TB's day.....LOL
Some area's you need to get aggressive....others just the opposite.....and its the experience that you pay for (and the steady hand) so you don't have to experiment on your own TB.
Sounds like you were conservative so you should be in OK shape
-Tony
Thread Starter
Burning Brakes
Joined: Sep 2008
Posts: 899
Likes: 18
From: Austin Texas
I hope you didn't remove much if any material near when the blade is in its rest position or anything less heading towards the fully closed position....improper TB porting has turned more TB's into scrap than you would guess and/or makes them near impossible to tune.
It only takes a little extra material removal in the wrong spot to ruin your TB's day.....LOL
Some area's you need to get aggressive....others just the opposite.....and its the experience that you pay for (and the steady hand) so you don't have to experiment on your own TB.
Sounds like you were conservative so you should be in OK shape
-Tony
It only takes a little extra material removal in the wrong spot to ruin your TB's day.....LOL
Some area's you need to get aggressive....others just the opposite.....and its the experience that you pay for (and the steady hand) so you don't have to experiment on your own TB.
Sounds like you were conservative so you should be in OK shape
-Tony
