Gains from throttle body
Thread Starter
Joined: Jun 2005
Posts: 2,265
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From: Oskaloosa, Iowa
Gains from throttle body I have a BTR equalizer cathedral port 102 intake. I have an adapter plate and stock throttle body. This is a Procharged setup. Is there anything to be gained by putting a 102 throttle body on it?
Thread Starter
Joined: Jun 2005
Posts: 2,265
Likes: 671
From: Oskaloosa, Iowa
This is a good watch, definitely different setup but informative.
https://www.youtube.com/watch?v=V4NTvhku-c4
https://www.youtube.com/watch?v=V4NTvhku-c4
In a suck through app (pd blower), a 90mm throttle body starts becoming a restriction between 550 and 600 rwhp. It's easily checked on a Magnuson Heartbeat TVS blower as there is a vacuum port between the throttle body and the blower. At 640 rwhp I saw 4" of vacuum there. I also checked vacuum between the air filter and the throttle body and there was none, so the CAI wasn't a restriction. Get rid of that restriction with a bigger throttle body and boost + power will go up. The higher the hp potential, the bigger the gains with the bigger throttle body.
Doesn't work that way with a blow through throttle body (turbo or centri blower). I've seen them well into 4 figures power wise with the stock throttle body. Not saying there wouldn't be any improvement. I've been told by folks way sharper than me that the gains aren't worth the trouble and expense.
Doesn't work that way with a blow through throttle body (turbo or centri blower). I've seen them well into 4 figures power wise with the stock throttle body. Not saying there wouldn't be any improvement. I've been told by folks way sharper than me that the gains aren't worth the trouble and expense.
In a suck through app (pd blower), a 90mm throttle body starts becoming a restriction between 550 and 600 rwhp. It's easily checked on a Magnuson Heartbeat TVS blower as there is a vacuum port between the throttle body and the blower. At 640 rwhp I saw 4" of vacuum there. I also checked vacuum between the air filter and the throttle body and there was none, so the CAI wasn't a restriction. Get rid of that restriction with a bigger throttle body and boost + power will go up. The higher the hp potential, the bigger the gains with the bigger throttle body.
Doesn't work that way with a blow through throttle body (turbo or centri blower). I've seen them well into 4 figures power wise with the stock throttle body. Not saying there wouldn't be any improvement. I've been told by folks way sharper than me that the gains aren't worth the trouble and expense.
Doesn't work that way with a blow through throttle body (turbo or centri blower). I've seen them well into 4 figures power wise with the stock throttle body. Not saying there wouldn't be any improvement. I've been told by folks way sharper than me that the gains aren't worth the trouble and expense.
Thread Starter
Joined: Jun 2005
Posts: 2,265
Likes: 671
From: Oskaloosa, Iowa
Thanks guys. This is kind of what I thought. I’m already over spinning the little D1x. I don’t really like having the adapter plate for the throttle body and have some money to blow, but I don’t have infinite money or like to waste money either.
Anything to gain going from a 2 1/2” catback with x pipe to a 3” with x pipe? Combo is ls3 based 377 with overspun D1x on e85 and meth injection.
Anything to gain going from a 2 1/2” catback with x pipe to a 3” with x pipe? Combo is ls3 based 377 with overspun D1x on e85 and meth injection.
What is your power output? If it’s dual 2.5” then yes should get big gains and if it’s a single 2.5” then hell yes huge gains. Superchargers need free flowing exhausts unlike turbos which do much better with smaller exhausts. You should be running dual 3” with Xpipe or equalizer of some type abs straight through perf core high flow mufflers. Long tubes in a decent 1 3/4 or 1 7/8 and mandrel bends. Any restriction on the intake or exhaust side makes big differences in superchargers as they only flow X amount at X rpm and it’s fixed. A turbo can spool faster and it’s not a fixed number. Bends and filters before a supercharger Inlet makes a big difference as well as restrictive exhausts.
I saw a noticeable improvement going from a single 3” catback to a 4” on a cammed 5.3 and centri at 12psi. (650ish crank HP) I did have big long tubes dual 3” into a flowmaster 4” merge which I necked down to 3” catback but eventually went with a 4” and picked up. Given that your a 377 and on a bigger unit on E85 I assume your pushing more boost over spinning it so power should be higher than where I was at.
I saw a noticeable improvement going from a single 3” catback to a 4” on a cammed 5.3 and centri at 12psi. (650ish crank HP) I did have big long tubes dual 3” into a flowmaster 4” merge which I necked down to 3” catback but eventually went with a 4” and picked up. Given that your a 377 and on a bigger unit on E85 I assume your pushing more boost over spinning it so power should be higher than where I was at.
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Thread Starter
Joined: Jun 2005
Posts: 2,265
Likes: 671
From: Oskaloosa, Iowa
What is your power output? If it’s dual 2.5” then yes should get big gains and if it’s a single 2.5” then hell yes huge gains. Superchargers need free flowing exhausts unlike turbos which do much better with smaller exhausts. You should be running dual 3” with Xpipe or equalizer of some type abs straight through perf core high flow mufflers. Long tubes in a decent 1 3/4 or 1 7/8 and mandrel bends. Any restriction on the intake or exhaust side makes big differences in superchargers as they only flow X amount at X rpm and it’s fixed. A turbo can spool faster and it’s not a fixed number. Bends and filters before a supercharger Inlet makes a big difference as well as restrictive exhausts.
I saw a noticeable improvement going from a single 3” catback to a 4” on a cammed 5.3 and centri at 12psi. (650ish crank HP) I did have big long tubes dual 3” into a flowmaster 4” merge which I necked down to 3” catback but eventually went with a 4” and picked up. Given that your a 377 and on a bigger unit on E85 I assume your pushing more boost over spinning it so power should be higher than where I was at.
I saw a noticeable improvement going from a single 3” catback to a 4” on a cammed 5.3 and centri at 12psi. (650ish crank HP) I did have big long tubes dual 3” into a flowmaster 4” merge which I necked down to 3” catback but eventually went with a 4” and picked up. Given that your a 377 and on a bigger unit on E85 I assume your pushing more boost over spinning it so power should be higher than where I was at.
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Verdad Gallardo Agree with blackbird, there's definitely power left on the table with your exhaust system. 1.875 or 2" headers along with a full 3" exhaust system into a free-flowing set of mufflers would show some pretty good power increases. Whether it's worth it to you to spend some pretty serious coin for the extra power.....I would just run it like it as is and enjoy it. Sounds like a fun ride.
Agree with blackbird, there's definitely power left on the table with your exhaust system. 1.875 or 2" headers along with a full 3" exhaust system into a free-flowing set of mufflers would show some pretty good power increases. Whether it's worth it to you to spend some pretty serious coin for the extra power.....I would just run it like it is and enjoy it. Sounds like a fun ride.
Thread Starter
Joined: Jun 2005
Posts: 2,265
Likes: 671
From: Oskaloosa, Iowa
I certainly don’t like to waste money so I’m definitely listening to what you guys are preaching.
I love the Procharger so I’m sticking with it.
I’m open to running a bigger head unit if that’s where money is best spent.
As far as distribution the equalizer intake seems to work well. I don’t have individual widebands or exhaust gas temps but reading plugs they all look the same. With the ls6 intake number 7 always showed more heat than the rest.
I love the Procharger so I’m sticking with it.
I’m open to running a bigger head unit if that’s where money is best spent.
As far as distribution the equalizer intake seems to work well. I don’t have individual widebands or exhaust gas temps but reading plugs they all look the same. With the ls6 intake number 7 always showed more heat than the rest.
Why not meet in the middle and install 2 cutouts? With a single 3” and a cutout was worth about 2psi no changes and at a lower power level than you. Would be interesting to see the results. Dual 3” is good for around 600-650hp before becoming a restriction… your 150-200hp over that.
Thread Starter
Joined: Jun 2005
Posts: 2,265
Likes: 671
From: Oskaloosa, Iowa
Why not meet in the middle and install 2 cutouts? With a single 3” and a cutout was worth about 2psi no changes and at a lower power level than you. Would be interesting to see the results. Dual 3” is good for around 600-650hp before becoming a restriction… your 150-200hp over that.
What do you think is the better cutout placement?