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grinding out inlet manifold internals? WHY?? 

 

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 Post subject: grinding out inlet manifold internals? WHY??
Posted: Sat Oct 20, 2007 7:59 pm 
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hey guys. this might be noob sounding question but i was checkin out eafalcon.com and found this guy turboing his ED. i was just wondering what would the benefits of doing this (see pictures below) to ur inlet manifold be. would it effect a N/A motor. cheers
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Posted: Sat Oct 20, 2007 8:02 pm 
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Because there is no benifit in having the long runner if using forced induction.

 

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Posted: Sat Oct 20, 2007 8:14 pm 
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Makes no differences if its pressurize under boost but it'll be a waste of time and effort if you're doing it for N/A. I try and explain it a simpler way, you end up with a wide flat spot from idle to 3500rpm. the pedal will feel spongy & end up with annoying kick downs.

 

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Last edited by Slick on Sat Oct 20, 2007 8:14 pm, edited 1 time in total.

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Posted: Sat Oct 20, 2007 8:14 pm 
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twason wrote:
Because there is no benifit in having the long runner if using forced induction.


thats what i was gonna say, but still dont know why? Whats the reasoning behind ditching the 2 stage runners?
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Posted: Sat Oct 20, 2007 8:48 pm 
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He is using an aftermarket plenum which is using both runners.

Leaving the split there just adds another restriction.
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Posted: Sat Oct 20, 2007 11:30 pm 
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Better air flow, bit more plenum volume.

 

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Posted: Sat Oct 20, 2007 11:33 pm 
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Only if its blown.

 

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Posted: Sun Oct 21, 2007 2:48 am 
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the thinner plennium will give you more torque down low due to its air mass, if you grind it out your low range will be sluggish, and top range may increace a little. its more suited to turbos that need the extra induction!

 

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Posted: Sun Oct 21, 2007 3:56 am 
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cooki_monsta wrote:
the thinner plennium will give you more torque down low due to its air mass, if you grind it out your low range will be sluggish, and top range may increace a little. its more suited to turbos that need the extra induction!
and thus ahs been proven on the dyno... AN EL XR6 manual.. stage 2 head and cam.. hollloew out bbm... = sluggish bottom end power... slightly better top end... PM "FAST XR"... :wink:

 

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Posted: Sun Oct 21, 2007 4:30 am 
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not being rude but i dont know if tyhis helps anything too much?
as heaps of money and time has been spent on making the nizpro plenum which has probably some of the best results.
they remove the secondary vac butterbly and dont use the primary side at all. In none forced applications longer runners improve low down torque. but in forced applications low down torque is not required and therefore higher power figures are achieved by the use of shorter runners and boost.

 

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Posted: Sun Oct 21, 2007 4:30 am 
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not being rude but i dont know if tyhis helps anything too much?
as heaps of money and time has been spent on making the nizpro plenum which has probably some of the best results.
they remove the secondary vac butterbly and dont use the primary side at all. In none forced applications longer runners improve low down torque. but in forced applications low down torque is not required and therefore higher power figures are achieved by the use of shorter runners and boost.

 

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Posted: Sun Oct 21, 2007 10:23 pm 
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ISQUIK wrote:
not being rude but i dont know if tyhis helps anything too much?
as heaps of money and time has been spent on making the nizpro plenum which has probably some of the best results.
they remove the secondary vac butterbly and dont use the primary side at all. In none forced applications longer runners improve low down torque. but in forced applications low down torque is not required and therefore higher power figures are achieved by the use of shorter runners and boost.


that post is a little confusing.

you would only do this if are running a aftermarket plenum.

with a nizpro plenum buy cutting out the middle part on each runner it will match the plenum.

 

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Posted: Sun Oct 21, 2007 11:16 pm 
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Quote:
cooki_monsta wrote:
the thinner plennium will give you more torque down low due to its air mass, if you grind it out your low range will be sluggish, and top range may increace a little. its more suited to turbos that need the extra induction!
and thus ahs been proven on the dyno... AN EL XR6 manual.. stage 2 head and cam.. hollloew out bbm... = sluggish bottom end power... slightly better top end... PM "FAST XR"...


below 3500rpm its a dog, but after that it really takes off hard... gained me about 5 rwkw, but lost nearly 100nm of torque down low! so its not work doing for NA cars...

although it did help me pip ford freak at the last dyno day, we both had the same rwkw reading but i won it by 5nm of torque! haha

 

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Posted: Mon Oct 22, 2007 1:24 am 
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FAST-XR wrote:
Quote:
cooki_monsta wrote:
the thinner plennium will give you more torque down low due to its air mass, if you grind it out your low range will be sluggish, and top range may increace a little. its more suited to turbos that need the extra induction!
and thus ahs been proven on the dyno... AN EL XR6 manual.. stage 2 head and cam.. hollloew out bbm... = sluggish bottom end power... slightly better top end... PM "FAST XR"...


below 3500rpm its a dog, but after that it really takes off hard... gained me about 5 rwkw, but lost nearly 100nm of torque down low! so its not work doing for NA cars...

although it did help me pip ford freak at the last dyno day, we both had the same rwkw reading but i won it by 5nm of torque! haha
suck it up.... while you can.... :lol: i didnt have to touch my manifold... :wink: :lol:

 

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Posted: Mon Oct 22, 2007 11:11 pm 
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hahaha, nor do i have a full high comp rebuild and a performance tune! :lol: :lol:

 

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