ITB + turbo?

[Bad_Dog]

Hi,

currently I have a turbo 4AGE - smallport 16V, with 8.9:1 GZE pistons, reversed stock 4age smallport intake manifold and GT2560R turbo.

What is your opinion about adding 20V ITB to that turbo engine?

Cheers.

[Gtsi-R]

since you run a turbo, I believe that you will not get more prffit out of ITB.. since there is always turbo preasure..

ITB will help on normal aspired engines..


or am I wrong..

:offtopic:

do you have a project topic ot the 4agte ?

sounds interesting!!

cheers,

Roel

[Roku_trueno]

It will definitely have better throttle response...

[NoHachi]

Take a look at the Nissan GTiR..it has a similar setup.

There are probably practical problems to overcome.
Different turbo anti-surge setup (now sudden very high pressure in intake manifold instead of vacuum before turbo).
Probably have to run a stiffer return spring on the butterflies.
Fueling needs to go via a MAF or vacuum reference lines in the runners "after" the butterflies (this last option might be tricky..don't know how stable the signal will be).

[Bad_Dog]

I guess it would be best to use TPS for load reference up to 80kpa (absolute pressure) and MAP sensor from 80 to 220kpa (where I plan to stop).

I would use ST or BT ITBs and they already have vacuum tank giving pretty stable MAP signal. I had the chance to map Silvertop with MSextra and have some experience in that area.

[Apolan]

i can give you an email adress of a friend of mine. He's putting together a citroen Mi16 + ITB + turbo and he did alot of research on the subject. He is making his own ITBs in solidworks to be cut on cnc machine and god i don't know what else.