What turbo?

[xboostedm3]

Simple question. What is the largest turbo you can cram under a 99 m3? Is it a GT30 or the GT 28? Any other suggestions would be appericiated.

[James]

Depends on the manifold and motor mount, but a GT35R is pretty standard these days. Some have gone bigger than GT35R, but I wouldn't consider them daily drivers at that level.

[92318is]

Not only that, but you don't want such a big turbo that you don't go into boost until like 5k rpms, thats basically unusable horsepower.
Just keep in mind that bigger doesn't always equal better. It all depends on what you're going to be using the car for. If its daily driving, a huge turbo is useless unless you dog the thing every time you drive it.

[Idrewfelix]

I've seen GT40's with certain manifolds fit properly

[Antony]

I have a GT35R T4. I have a custom tubular equal length top mount turbo manifold which I believe might be the first of it's kind. I saw another person with a bottom mount who hit full boost on this turbo at 2k, which I believe is awesome! So I should be pretty good there. By the way, the manifold is still a bitch to install and I hopefully will get it done soon, if I ever work on it.

[dredder]

Originally Posted by Antony

I have a GT35R T4. I have a custom tubular equal length top mount turbo manifold which I believe might be the first of it's kind. I saw another person with a bottom mount who hit full boost on this turbo at 2k, which I believe is awesome! So I should be pretty good there. By the way, the manifold is still a bitch to install and I hopefully will get it done soon, if I ever work on it.

3.0 will not get you full boost on gt35 at 2k

[Antony]

i wasn't saying I was, I was saying the other guy did

[Highboosted]

Might get you "full" boost if he runs 9 psi or something.

me personally? I think the GT35 is too small, but I'm known to be nuts.

[FaRTaLOTTT]

PT76-GTS - 1000HP @ the wheels....jk, you asked though.

http://www.europeancarweb.com/featur..._turbo_bmw_m3/

[BMW Maniac]

I love my GT35r...and I think I get full boost (15psi) at about 3800rpms...2000 would be just smoke.

[E30stain]

dad is thinkin of putting a gt30 turbo on his mr2 gt... the whole 'custom fab' thing is putting him off a bit. Plus the fact that mr2 engine bays are a tad hard to work with... he might go for a slightly smaller turbo so it fits easier and doesnt need so long to spool up.

[UrineMachine]

GT35R is on the norm and "small" these days.

[Defacto]

Originally Posted by UrineMachine

GT35R is on the norm and "small" these days.

True. That being said, it's the norm for a very good reason. There really isn't another turbo that I can think of that offers such great behavior, while delivering VERY healthy power numbers...it's one heck of a sweet compromise

And to what someone was saying above...the gain on your EBC must be set incorrectly or something, because I found my 35R making 21psi by 3300 RPM...

[Highboosting///M3]

I rode in my friend's M3 who has a T4 tubular manifold and a pt67 non-ball bearing .63 a/r hot-side turbo. Full boost making 616whp is 3500rpm. Still very streetable and capable of 700whp easy.

So far that is the single most enjoyable car I have ever experienced. Much better than the T66 Supra I had or other single turbo Supras I have been in.

So yes, with this car you can make plenty of power and still have it very streetable. He does have a 2.79 geared LSD which helps keep the car in boost longer and is very enjoyable at cruising speeds. So with a shorter gear ratio you can get to boost even sooner, but will sacrifice traction. Also a dual ball bearing setup would obviously increase the spool much more as well.

[Concentric190]

I have a small turbo