rb26 intake plenum

[Nesquick]

so just a quick question here....

i remember reading a while ago that the stock rb26 plenum causes the rear cylinder(s) to run leaner than the rest. t/f?

p.s.

could a good tune on a pfc fix this problem?

[raremotive]

It isn't true. The rear always runs hotter than the front based on it's coolant design.

[Nesquick]

ah i see.

if the coolant channels in the block are bored out slightly, could that fix the problem?

[Joe]

lol its not that simple

its an inherent design flaw of the RB engines. just live with it cause you arent gonna spend the thousands and thousands of dollars to attempt to fix it the right way.

[Nesquick]

well are there any helpful hints to not have it run as hot

[Joe]

yea first hint is use the search button

second one is a big dual pass radiator and good fans with 1-2 bottles of watter wetter.

[eh?]

so just a quick question here....

i remember reading a while ago that the stock rb26 plenum causes the rear cylinder(s) to run leaner than the rest. t/f?

p.s.

could a good tune on a pfc fix this problem?

Supposedly yes. That's why nismo made a redesigned plenum.

http://www.nengun.com/nismo/in...lenum

OR just get a decent standalone and adjust your rear cylinders to run a bit more richer.

[Joe]

$1800 for an intake manifold?

wow.

[raremotive]

Just remember that the rb26 runs ITB's, then you also have the transient flow characteristics where air actually does comes back out of the inlet pipe. The intake plenum is anything but steady state flow. If it was a single throttle, yes I would believe.

Joe, I believe that is the same plenum used in the GT race cars, when they actually used the RB motor.

[Joe]

ill pretty much bet money its not haha



and i could be totally wrong. that might be a nismo manifold on there but somehow i doubt what goes in a 500hp endurance racecar will ever be sold to the public.

[HxC_Nismo]

im going to be running the Greddy intake plenum on my rb26

[raremotive]

ill pretty much bet money its not haha



and i could be totally wrong. that might be a nismo manifold on there but somehow i doubt what goes in a 500hp endurance racecar will ever be sold to the public.

Not Exactly same, but very simular.

Speedhunter did one on the z-tune:

http://speedhunters.com/archiv....aspx

The Z-tune was also the first car to run the Nismo GT plenum, the exact same part that the RB-powered GT-500 GT cars used to run, supplying an equal amount of air to all six cylinders.

Modified by Rare_f8 at 5:44 AM 2/1/2010