Jeff's MSP GTR Build
- Thread starter jeffmsp
- Start date
AzteCypher
black ops modifications..
- :
- 2001 Mazda Protege LX
Nice! Can't wait to see it!
Here's an example of ITBs with a plenum to allow you to run a turbo on it:
http://i852.photobucket.com/albums/ab87/95isturbo/2009-12-18190731.jpg
Here's an example of ITBs with a plenum to allow you to run a turbo on it:
http://i852.photobucket.com/albums/ab87/95isturbo/2009-12-18190731.jpg
it is a new intake manifold that has 1 throttle plate for each cylinder located in the intake runner rather than just 1 throttle for all 4 on the plenum entrance. just google it if u still dont understand. common place on vehicles such as skyline, ae86, pulsar gtiR etc. mine are taken from a GSXR 750cc street bike.
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so you want me to write a essay because you dont wana type "itbs advantage" into google?
heres the short version. when done right you get increased mainly throttle response, altered powerband and peak power compared to the stock BP IM(well thats what I am shooting for anyways) . Also increased throttle plate area which is a plus if your current throttle plate is too small for the job etc.
there is quite a bit more to it than that which is why i suggested you google and have a read. as with any manifold, changing runner length, shape, adding trumpets etc. all causes changes in airflow. it is very easy to get wrong and have negative results which is why i have built 2 prototype manifolds before having this one made by someone else.
heres the short version. when done right you get increased mainly throttle response, altered powerband and peak power compared to the stock BP IM(well thats what I am shooting for anyways) . Also increased throttle plate area which is a plus if your current throttle plate is too small for the job etc.
there is quite a bit more to it than that which is why i suggested you google and have a read. as with any manifold, changing runner length, shape, adding trumpets etc. all causes changes in airflow. it is very easy to get wrong and have negative results which is why i have built 2 prototype manifolds before having this one made by someone else.
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- :
- 99 protege
BUILD THREAD??? no??? ask questions and comment! aj has been thro alot this week stop giving him stuff! he dont need more! and looks good, you have one of a kind msp!
no worries i was just kinda busy at work at the time i wrote that. multitasking ftl
what will be interesting to see is how the itbs will perform to a single throttle as I will be able to just remove the throttles altogether and replace with silicone couplings and then put on a single throttle whenever I want to switch the layout. this way I can get direct back to back comparsion with very little to do to swap back and forth.
as for the benefits, I am hoping to have increased throttle response, a larger powerband and a higher peak power number compared to the stock BP FWD IM *if* I did everything right. With itbs it is pretty easy to go two steps back with minor changes so I try to document everything along the way and build several protos to get things right. the biggest lesson I have learned so far is to keep the length of the runner from the itb to the flange as long as possible compared to the runner from the itb to the plenum. Seems to make even more of a difference than runner diameter changes with the GSXR itbs. My guess is that this is because the "outlet" of the itb is not perfectly round due to the integrated injector mounting, and the airflow needs more space to get back on track, where as the other end or the "inlet" has a perfectly round diameter. I think if I spent some time porting the ITBS to make the "outlet" more circular I could diminish or eliminate this effect, but thats out of the cards for now.
what will be interesting to see is how the itbs will perform to a single throttle as I will be able to just remove the throttles altogether and replace with silicone couplings and then put on a single throttle whenever I want to switch the layout. this way I can get direct back to back comparsion with very little to do to swap back and forth.
as for the benefits, I am hoping to have increased throttle response, a larger powerband and a higher peak power number compared to the stock BP FWD IM *if* I did everything right. With itbs it is pretty easy to go two steps back with minor changes so I try to document everything along the way and build several protos to get things right. the biggest lesson I have learned so far is to keep the length of the runner from the itb to the flange as long as possible compared to the runner from the itb to the plenum. Seems to make even more of a difference than runner diameter changes with the GSXR itbs. My guess is that this is because the "outlet" of the itb is not perfectly round due to the integrated injector mounting, and the airflow needs more space to get back on track, where as the other end or the "inlet" has a perfectly round diameter. I think if I spent some time porting the ITBS to make the "outlet" more circular I could diminish or eliminate this effect, but thats out of the cards for now.
AzteCypher
black ops modifications..
- :
- 2001 Mazda Protege LX
Good to know about the longer runners. If you're not going to use the stock ITB injector openings, you might be able to get them welded shut and then ground the outlet down to a true circular opening.
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