Which turbo???

[luke01]

The time has come to decide on which turbo to go with for my E34 (M20)....
I've decided a T3 flange size, air-cooled, and been quoted on a garrett turbo (AUD$1400)
Does anyone know what KKR turbo's are like? Seen similar specs to the garrett i was quoted going for AUD$800...

[pundit]

Get an M30 first... then a turbo!! :)

[luke01]

Get an M30 first... then a turbo!! :)

whats wrong with an M20 turbo?

[BigKriss]

not enough air flow to get that big turbo working hard!


whats wrong with an M20 turbo?

[genphreak]

not enough air flow to get that big turbo working hard!C'mon guys.... :) Don;t be so nally. M20s are good engines, just smaller. Ideal cadidates for turbos too, and they are more efficient than their bigger, older cousins... Luke, KKK are good turbos, the factory setups are hard to beat if you have reliability and longevity in mind rather than stunningly bright performance for a short time... I'd go with a factory setup if I did it, but it is easier to play perhaps with an M20. :) Nick

[Alexlind123]

Sorry to go a bit off topic, but why are nearly all of the turboed e34s that are documented online m30s? Luke may want to know. I dont think i have ever read about a 530i or 540i. Perhaps this is because the m30 is so over engineered in the first place that it can withstand boost pressures at which other engines would blow apart?

[angrypancake]

i've seen a few supercharged 540's around, there was a guy named JimmyZ that had a black/black one. he got banned from bf.c though or something. last i saw of his car was on the eurowerkz california site

[ILoveMPower]

Sorry to go a bit off topic, but why are nearly all of the turboed e34s that are documented online m30s? Luke may want to know. I dont think i have ever read about a 530i or 540i. Perhaps this is because the m30 is so over engineered in the first place that it can withstand boost pressures at which other engines would blow apart?

This is mainly because of how bulletproof the M30 design is, single overhead cam with semi-large displacement and a rock-solid bottom end pretty much make it the perfect candidate.

There's a guy andrew (i think) on here with a turbo M30 pushing 350+ rwhp with 220k miles on a completely factory motor. How many other engines do you know that can handle that?

[M20Turbo]

I agree, the M20 is a good little engine to turbo. I have had alot of fun with mine. ;)


C'mon guys.... :) Don;t be so nally. M20s are good engines, just smaller. Ideal cadidates for turbos too, and they are more efficient than their bigger, older cousins... Luke, KKK are good turbos, the factory setups are hard to beat if you have reliability and longevity in mind rather than stunningly bright performance for a short time... I'd go with a factory setup if I did it, but it is easier to play perhaps with an M20. :) Nick

[Jon K]

This is mainly because of how bulletproof the M30 design is, single overhead cam with semi-large displacement and a rock-solid bottom end pretty much make it the perfect candidate.

There's a guy andrew (i think) on here with a turbo M30 pushing 350+ rwhp with 220k miles on a completely factory motor. How many other engines do you know that can handle that?


No its not - its because the M30 was available since like late 1970 Andrews motor is blown.



PS what the hell is an aircooled turbo?

BigKriss - A T3 is perfect size for any 2.5L engine. We run a T3/T04E on a 3.0L engine and its actually too small for what we want to do.

[Alexlind123]

Is it just me, or is JonK not making sense?

[Johntee540]

If you visit the e39 board on Roadfly there are a lot of 540 turbos over there. I think its a safer statement to make if you say "gosh not many e34 540 owners have the $$ to blow on a turbo" - certainly the motor can take it. JT

[Jon K]

Whats not to understand? The M30 design has more turbo options for it because, well, it CAME turbo'd on 7 series... the engine exhaust manifold has been cast since the last 70's.

He mentioned andrews car being strong on boost with 220k miles... andrews motor is now blown and being rebuilt.

The original poster said he wanted a T3 flanged turbo, air-cooled. There is no such thing as an air cooled turbo. They are all oil cooled or oil and water cooled.

Big Kriss said a T3 turbo is way too big for an M20 - an M20 is 2.5L, we had a T3 on a 2.7L motor and it was perfect, that same motor is now punched out to 3.0L and the T3 turbo is too small.

Many E30 M20 turbo cars are running holset turbos from diesel trucks...

Alexlind - I make perfect sense - hows your reading comprehension?

[Jon K]

If you visit the e39 board on Roadfly there are a lot of 540 turbos over there. I think its a safer statement to make if you say "gosh not many e34 540 owners have the $$ to blow on a turbo" - certainly the motor can take it. JT


John - I disagree - I have NEVER seen a turbo 540. A turbo 540 would require one retarded exhaust manifold for a single turbo, but more likely two exhaust manifolds meaning twin turbo - I've been around a while and have NEVER seen a turbo 540. I think you're thinking of supercharged.

[genphreak]

No its not - its because the M30 was available since like late 1970 Andrews motor is blown. BigKriss - A T3 is perfect size for any 2.5L engine. We run a T3/T04E on a 3.0L engine and its actually too small for what we want to do.I'd like a T3 on mine, that'd be just right for my needs...

[Jon K]

Honestly a T3 on a 3.5L is a little bit on the small side. I'd rather have a T3/T04 or T4

[Anton CH.]

I am sticking a GT2871R into mine. Perfect size for the 2.5L.