Any worthwhile gains from larger TB?
Thread Starter
Joined: Jul 2005
Posts: 1,264
Likes: 1
From: Scarborough, Maine
Any worthwhile gains from larger TB? I came across a TPIS oval throttle body (78x90mm) and LS6 oval conversion intake a couple of weeks ago in the classifieds here for a reasonable price.
I've searched around, and know guys are putting down big numbers with big blowers and turbos using ported TB's and stock LS6 intake. Simply turning up the boost isn't an option.
So seeing as i'm running a (little) supercharger, and am limited to X amount of boost based on pulley size. Would there be any noicable gain from stepping up? Are the stock TB and LS6 intake creating any type of restriction at this point, or is the Vortech aftercooler & pipes more of a restriction?
I've searched around, and know guys are putting down big numbers with big blowers and turbos using ported TB's and stock LS6 intake. Simply turning up the boost isn't an option.
So seeing as i'm running a (little) supercharger, and am limited to X amount of boost based on pulley size. Would there be any noicable gain from stepping up? Are the stock TB and LS6 intake creating any type of restriction at this point, or is the Vortech aftercooler & pipes more of a restriction?
it should help a little. The aftercooler can handle a ysi up to 15 lbs believe it or not. its the nipple on the aftercooler that poses a restriction. RMCR cuts off the nipple and rewelds a bigger one to match the outlet of the bigger blowers.
Thread Starter
Joined: Jul 2005
Posts: 1,264
Likes: 1
From: Scarborough, Maine
I have the T-Trim, just waiting to get my racecar out of the garage so I can work on the Camaro. I'll start working on a bunch of stuff here in the next month or so.
How much is the Vortech aftercooler supposed to flow? Is the core in the aftercooler the restriction or the piping that connects to the blower and TB? I remember hearing about RMCR fabbing up larger in/out on them, but never saw one like that.
How much is the Vortech aftercooler supposed to flow? Is the core in the aftercooler the restriction or the piping that connects to the blower and TB? I remember hearing about RMCR fabbing up larger in/out on them, but never saw one like that.
dont know the flow numbers off hand, but I called their tech dept and asked them and that's what they told me.
RMCR went with 4 in piping on the ysi to help airflow. its not necessary but it will help.
the restriction is right where the blower connects to the aftercooler. send the aftercooler to them to get rewelded with a bigger nipple and you should be all good.
they fabbed up a cogged belt system for the ysi , a member here has it. looks awesome.
RMCR went with 4 in piping on the ysi to help airflow. its not necessary but it will help.
the restriction is right where the blower connects to the aftercooler. send the aftercooler to them to get rewelded with a bigger nipple and you should be all good.
they fabbed up a cogged belt system for the ysi , a member here has it. looks awesome.
When I went turbo, research basically said that I couldn't go wrong going up to a 90mm TB and LS2 intake over a stock ported TB and stock LS6 intake. Is the gain 20 hp? I have no idea, but there are a ton of low 8 second cars running the 90mm stuff. But the OH Boys went low 8's I think with an LS6 intake too.
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Verdad Gallardo Thread Starter
Joined: Jul 2005
Posts: 1,264
Likes: 1
From: Scarborough, Maine
Thanks PSJ and Got Me Som, I appreciate your advice.
Also encouraging anybody else to express their opinions as well.
BTW, Vortech claims 1200cfm on the T-Trim, and TPIS claims 1200cfm through this TB.
(The only reason i'm considering this is because of the price)
Also encouraging anybody else to express their opinions as well.
BTW, Vortech claims 1200cfm on the T-Trim, and TPIS claims 1200cfm through this TB.
(The only reason i'm considering this is because of the price)
A couple things to consider:
1) We all know that an engine is an air pump.
2) Boost is nothing but a measurement of restriction.
Any time you can get more flow to a given combination, you will gain HP. In this case you will be able to make the same or more HP with less boost. If your set-up allows you to increase the boost back to where it was it will give even more power. This is assuming that you increase the flow of the intake tract ie: TB, intake and heads significantly over what you already have. I'm not so sure that the TPIS set-up will produce much over the LS6 intake and TB you already have. Unless you are ready to step up to an aftermarket intake and TB, I say port the TB and be done with it.
1) We all know that an engine is an air pump.
2) Boost is nothing but a measurement of restriction.
Any time you can get more flow to a given combination, you will gain HP. In this case you will be able to make the same or more HP with less boost. If your set-up allows you to increase the boost back to where it was it will give even more power. This is assuming that you increase the flow of the intake tract ie: TB, intake and heads significantly over what you already have. I'm not so sure that the TPIS set-up will produce much over the LS6 intake and TB you already have. Unless you are ready to step up to an aftermarket intake and TB, I say port the TB and be done with it.
10 Second Club
Joined: Apr 2002
Posts: 1,755
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From: Cincinnati, Ohio
IMHO the biggest gain you could get out of a G-trim setup would be to go to a speed density tune. The MAF on the intake side acts as a restricter plate. You have a 3 1/2" opening choked down by a 75mm MAF. When I switched the MAF to the pressure side I picked up 2lbs. boost (40-60rwhp gain). Because of the aftercooler design it would be tough to squeeze a MAF in there. I don't think anybody on here has done this with a G-trim but I feel certain it would be a considerable gain.
I agree with if you can get more air into the intake you will be better off. You need to get it tuned any way, SOOOOO get the bigger T/B and get rid of the MAF. Speed density tune is the way to go IMO.
David
David
Just a quick comment on the RMCR kits. I moved up to the YSi, but am sticking to the 3" intake path to the supercharger for now. RMCR wanted $800 for the 4" stuff. Yikes! Maybe I'll see about fabbing my own.