forced induction question

[whterice]

do you guys recommend doing a cam with forced induction?

[StereoInstaller1]

Yes, you should have a cam.

[nando]

absolutely. a good N/A cam is also going to be a good turbo cam.

[whterice]

what do you recommend for a good cam? mine is worn and broke a rocker

[gothguy70]

A new stock replacement cam should be fine for a while.And fix the broken rocker ofcourse.Upgraded valve springs should go in with the new cam.

[Spinning Tires]

Stock cam is the best unless you find a company that makes a turbo cam cause an aftermarket N/A cam will NOT work well

[nando]

Stock cam is the best unless you find a company that makes a turbo cam cause an aftermarket N/A cam will NOT work well

again, not true.

convention wisdom pwns j00.

[Spinning Tires]

Most companies making an N/A came make the lobe separation too big causing the built up exhaust pressure to back feed through the intake

[nando]

if you have that much exhaust back pressure then your exhaust is too small.

look at what the guys in scandanavia are running. there is a reason people here struggle to produce 300whp and people over there do 500whp in their sleep.

[Liam]

Yes, you should have a cam.

Turbocharging is a little outside of my scope of expertise but I must agree here always have a cam in your engine, I don't think they will run at all otherwise.

I have been told by a power-plant wizard that big overlap is not your friend with turbocharged engines and delaying intake opening is the trick (this is hearsay, take it with a grain of salt then go research it thoroughly).

[whterice]

what duration of cam do you recommend?

[Spinning Tires]

what kind of motor is this for?

[Spinning Tires]

if you have that much exhaust back pressure then your exhaust is too small.

look at what the guys in scandanavia are running. there is a reason people here struggle to produce 300whp and people over there do 500whp in their sleep.

exhaust pressure before the turbo is always going to be more then intake pressure

[whterice]

what kind of motor is this for?

1990 325i so m20b25

[nando]

heh, for some reason I thought you were building a 24v motor.

I still would reccomend a decent cam. what are you using this for? I'd look into what blacktrail69 used, he was making over 300whp at 10psi with a 280 degree or so duration catcams. The shrick 288 would also be a good choice if it's more of a race/fun car than a DD.