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?

 

This is a good watch, definitely different setup but informative.

 

I would think having the blower after the throttle body vs blower before throttle body would be a big difference.

 

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.

 

Indeed it is.

Agree, seen turbo guys make well over 1000 on an 80mm, meanwhile PD blower guys suck with a 90. Just another advantage of turbo

 

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.

 

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.

 

Never been on a dyno. Based on trap speed and weight I should be a little over 800. Exhaust is 1 3/4 stainless works headers no cats dual 2 1/2” exhaust with x pipe magnaflow mufflers.

 

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.

 

So true on the money aspect, bang might not be worth the bucks. Back in the day I had some old rusty doug thorley tri-y headers, I thought for sure they were costing me a bunch of power. I went out and dropped a stack of $$$ for big ole shiny 1 7/8 kooks, 3" collectors, dual 3" exhaust, etc... car hardly picked up in the 1/4, certainly didn't pickup $1,500 worth. Sold all that junk, went turbo and never looked back.

 

Be more a advantage to distribution by slowing air entering he plenum than anything

 

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.

 

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.

 

Thats an option I would consider if there are gains to be had. My wideband is in the rear o2 bung and right after that is the flange the 2 1/2” catback bolts to. I’m open loop so I could move the wideband to the front o2 bung and put the cutouts between the front and rear o2 bungs so they are in the 3” section. They would be before the x pipe though since the x pipe is in the 2 1/2” section. I could also put the cutouts after the x before the mufflers but this would be in the 2 1/2” section.

What do you think is the better cutout placement?