i talked to a few people and they said that with this high of a CR that i might not make good power with the itb's and to maybe go with a ported intake mani, i have a skunk2 on my stock gsr thats in my car right now, would i be better off getting that ported? what do you NA people have to say on this?

 

im not sure who told you that but you where mislead , ITB's are what all the big guys are running for a reason , think of it this way , say your gonna use a 70mm tb on a ported s2 manifold, you have to cram all the air through a 70mm opening then have it turn a 90 degree angle to get to the runners ok! well with itbs you have say 4 52mm tb's whitch to get even the same amount of opening youd have to run a 208mm tb , also the itbs pull there air from a straight runner and scavange around the air horns with build trumendous velocity to the runners witch will also aid in atomization , just my 2 pennies

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by racerboyb18c1 &raquo;</TD></TR><TR><TD CLASS="quote">im not sure who told you that but you where mislead , ITB's are what all the big guys are running for a reason , think of it this way , say your gonna use a 70mm tb on a ported s2 manifold, you have to cram all the air through a 70mm opening then have it turn a 90 degree angle to get to the runners ok! well with itbs you have say 4 52mm tb's whitch to get even the same amount of opening youd have to run a 208mm tb , also the itbs pull there air from a straight runner and scavange around the air horns with build trumendous velocity to the runners witch will also aid in atomization , just my 2 pennies</TD></TR></TABLE>

its not what all the big guys are running , itb's are going to be used less and less when you can make a manifold design thats just as efficient as an itb setup , the intake manifold can draw better air via cold air intake or ram air etc . itb's suck up nasty air from the back of the motor and from higher up. technology is going to phase itb's out for b/d/h i think. k's another story.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hella_JDM &raquo;</TD></TR><TR><TD CLASS="quote">

its not what all the big guys are running , itb's are going to be used less and less when you can make a manifold design thats just as efficient as an itb setup , the intake manifold can draw better air via cold air intake or ram air etc . itb's suck up nasty air from the back of the motor and from higher up. technology is going to phase itb's out for b/d/h i think. k's another story.</TD></TR></TABLE>Same story for K's look at ips's manifold that they have designed that makes equal or more power then itb's. IMO if you build an induction system with the proper sizes to the motor and the rpm range you are looking to utilize then it can create close to the power of itb's if not more at a cheaper price. Porting an intake manifold is a popular option, it creates good power and when using close to oem sizes like the skunk2,aebs,blox it makes good increases in the low end and mid-range. either way you go will be a +, hope that helps

 

so what are some bad *** IM for gsr?? i am curious to hear what the big dogs run.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2000turbogsr &raquo;</TD></TR><TR><TD CLASS="quote">so what are some bad *** IM for gsr?? i am curious to hear what the big dogs run. </TD></TR></TABLE>

likewise, what are some of you guys running. looks like i might just port my skunk2 then..

 

Jeff from Importbuilders builds a nasty IM for n/a b-series. Also the sheet-metal JG manifold is a good design. Stay away from the JG/Edelbrock one though, thats a hard manifold to make power with in a n/a application...better for boosted motors. I would like to see the new Full Race mani on a big big motor, I think anything under a big 2 liter would suffer from it. I know Endyn is claimin a buncha **** with his manifold, but I'm not gonna even go there. Bottom line is it seems like the ported type r/S2/Blox manifolds are doing very well depending on who does the manifold

*EDIT* Is Markie reppin ATS now!?

 

you can use an OEM manifold, or get an aftermarket manifold, but why would there be a need to port it?

 

last time i checked, ITBs have the injectors furthur back and the runners are longer than MOST intake manifolds...

 

how about the ENDYN intake manifold it made more power than the AIR i/manifold
http://www.theoldone.com/compo...s.htm
thats the link

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by yosolo &raquo;</TD></TR><TR><TD CLASS="quote">how about the ENDYN intake manifold it made more power than the AIR i/manifold
http://www.theoldone.com/compo...s.htm
thats the link</TD></TR></TABLE>

yea but isnt that endyn manifold and the AIR manifold like $1200?...i say itbs is the way to go...it will make way more then a ported skunk 2 IM...just my .02

 

Lots of people talk about losing power with ITB/Carb/1 throttle per runner type set ups, but how many of these set ups were actually tailored to the specific needs of the engine. It seems that most companies just make a one length for all (that could also be affected by horn length) but no one ever seems to discuss harmonics or optimum runner lengths for ITBs/Carb set ups. Perhaps this is why people are bolting on off the shelf units and not seeing any dramatic results or gains. I believe this is why we see the backlash against ITBs and the support of plenum style manifolds lately.

 

Maybe they need to read the FAQ at Jenvey.com. That is why they have 7 or TB sizes and 20 horn setups, and spacers and air horns with the injectors in them. Design it right and it will work..

 

On top of that, they are comparing a $1000+ ITB or manifold setup to a $250 manifold like Skunk2.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JaeOne3345 &raquo;</TD></TR><TR><TD CLASS="quote">Lots of people talk about losing power with ITB/Carb/1 throttle per runner type set ups, but how many of these set ups were actually tailored to the specific needs of the engine. It seems that most companies just make a one length for all (that could also be affected by horn length) but no one ever seems to discuss harmonics or optimum runner lengths for ITBs/Carb set ups. Perhaps this is why people are bolting on off the shelf units and not seeing any dramatic results or gains. I believe this is why we see the backlash against ITBs and the support of plenum style manifolds lately. </TD></TR></TABLE>

just like you mentioned, harmonics and runner lengths are very significant factors. What these ppl are factoring in to their statements, i have no idea...

 

Also--4 52mm ITB DOES NOT equal one 208mm throttle!! The 208mm throttle will flow quite a bit more air!!!!!

 

So what does it equal? The reason I stayed awake in
math class.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2000turbogsr &raquo;</TD></TR><TR><TD CLASS="quote">so what are some bad *** IM for gsr?? i am curious to hear what the big dogs run. </TD></TR></TABLE>

Erick Aguilar (Erick's Racing) runs a CRAZY modified GSR manifold on his all motor race car.

Anybody got a pic of that thing?