Turbo my E34.... twins work

[Jon K]

#2 and #4 would be the best/cheapest choices, your torque figure of 230nm/170 foot pounds is close to the stock rating of a b27, one of the better motors to start with is the 88 super eta it's a 2.7 that already has the I b25 head on it, so it has the correct pistons for the I head (E pistons won't work unless you want to push lots of boost to make up for the really low compression) but the cam in the super E is not the regular I cam and it only has single valve springs, a super E motor with a I cam/springs (or maybe a aftermarket performance cam) and I injection computer with a few bolt on goodies like a chip and some headers may be the motor you want for the stated power level without going to a turbo

I agree - there is no point in attempting to run even a single turbo with such low requirements.

PS winfred I have boost control working with MS So sick.

[winfred]

cool, i haven't had time to screw with mine since i got it built but i gotta get on it soon as i am probably going to finish my motor today, whats your favorite active idle control, i've done the tip120 pwm stuff but on further reading i am not sure if this is the right way for real idle control, everybody seems to have their own way of running a 3 wire bosch valve

PS winfred I have boost control working with MS So sick.

[Jon K]

cool, i haven't had time to screw with mine since i got it built but i gotta get on it soon as i am probably going to finish my motor today, whats your favorite active idle control, i've done the tip120 pwm stuff but on further reading i am not sure if this is the right way for real idle control, everybody seems to have their own way of running a 3 wire bosch valve

Yeah i like but have not used the pwm idle board available at www.glensgarage.com it drives the 3 wire "properly" supposedly.

[NAT9566]

hmm.... thank you all for the choices given,.....

Looking around for a M20b25 block.... ( common but hard to find decent blocks)
at the same time looking for a m20b27 ( hard to find but overengineering ensures good condition)

SO i am left with a m20b25 plus a midsize turbo or a '88 NA M20b27 with a b25 header...