Is anyone running ITBs ? if so post your setup and pics !

 

can you even run itb's with a forced induction setup?

 

Yea you can. Its not worth the money though. Relatively pointless from a cost-benefit perspective. IIRC a RB25 skyline motor came stock with ITB's.

 

Of course you can, it just may be needlessly complicated on a forced induction application.


you would need a HUGE intake plenum that could fit all them butterflys but why bother, just get a huge intake throttle body and intake manifold and just take the lag that comes with it.

 

what would be the point of running ITB on the evo? any possible benefit at all?

 

It's worthless unless you're running a full race motor.

 

Naturally aspirated throttle response out of a turbo engine. Plus you can use larger runners and a larger plenum for better airfllow without the associated loss on the low end.

It can be done, but it would have to be a custom job and would get expensive. Obviously there'd be a little tuning involved also.

 

you pretty much hit it right on the head there. being an NA guy at heart itb's have a multitude of benefits for mostly mild to wildly built motors. thats not to say that a lightly bpu evo wouldnt benefit from itb's but with the way mitsu designed the mivec system for the 4b11t the response is already there. here's what a sick setup for a 4b11t would be if you were to do itb's:
2.3L stroker
9.5:1 CR
45mm itb's
8 to 10in long runners
GT3582R
full race turbo mani or ets (to further help spool)
cosworth cams to help out up top
1000cc injectors
ams fuel rail
walboro 255
and a 5L surge tank for the itb's

i could see a setup like that making full boost by no later than 3800 and it would have gobs of torque down low and have the means of not choking off up top. quick someone build it. lol

 

Seems pricey, what kind of gains are we talking here?

As for a large plenum intake manifold, it's possible that going from 1.4L stock to 2.8L of the Blitz might add some lag. So far using a size somewhere in between that has better velocity through the runners seems to have been a very positive benefit at all RPM's there was no increase in spool or extra lag introduced.

With a 75mm TB I think once you are at 550 crank HP the slight lag induced would be well worth the gains although velocities would still be higher than stock levels and probably optimal at 650 crank HP.

 

You wouldn't even need a humongous intake plenum or a huge turbo setup to take advantage of ITBs. Something like the size of the Blitz would be fine, and if you wanted to go larger, it would only help. Plus you won't have to neck down right away for a throttle body, so you can run a gentle taper from size of the plenum to the intercooler pipe. Get some 45-48mm throttles close to the head and some runners that start at the throttle and taper out to 50mm or so with velocity stacks on the end.

Obviously the large plenum/large runner setup will help in the power department, but you'll also gain throttle response with the throttle plates being that close to the head. Universal individual throttles are available, but the rest of the setup would have to be custom made, so it would get pretty expensive. Also, I wouldn't know first hand, but I hear ITBs are a little difficult to tune for.

 

i am not familiar with itb's a whole lot but with the cost of itb's would be on an evo, wouldn't just running a stroker kit give you about the same amount of gains...... might be a bit more expensive but with all the custom things you would need to do, im not sure just how much more it would really be and tuning is a BI%*$ with itb's.

just REALLY doesn't seem worth it, especially with the technology of turbos and the engines right now.

you add a stroker on an evo 8/9 or a X motor and a green / red / black - you have all the power you want and still near stock like spool with a BUNCH of torque.

they certainly look sweet though......

 

Jenvey's new Mitsubushi manifolds for Evo 7,8,9 -MM01

http://www.facebook.com/profile.php?...d=194777241351

Decription :

Our new MM01 inlet manifold has been designed to get the ultimate power from the last range of Mitsubushi Evo engines.

The man...ifold can accommodate up to 8 injectors and it is ideal for high power engines that are running 4 individual throttle bodies or a large single throttle body.

When used in conjunction with our turbo plenum you will see excellent fuel mixing and
increase in power over the standard manifold.

 

There's no 4G63 under my hood...

Nice looking setup though.

 

so non of you guys are searching constant power throughout the powerband ?
quicker throttle response as well ?


I assume everyones mind set is to have the biggest turbo and e85 thing going ?

or do you guys need to see some #s before this cross your mind ?

I like to hear some more thoughts and opinions, Postive or Negative ..

 

Numbers are always great.

If I'm shelling out $1000-2000 in extra components it better spool like 500 rpm's faster and deliver 30-40 whp, but I'm not sure that's possible.