Turbo Size

[mr 32]

i am looking to blow my 71 capri, but im unsure of turbo size.

the engine is a 3lt v6 i want to run a twin setup.

i would like to get full boost at least 2000rpm as my redline is 5750rpm.

my goal is to run a max of 8 psi but closer to 4-6 psi for everyday.

thanks mr 32

[lordsnipe]

twin capuccino turbos?

[RS500]

i am looking to blow my 71 capri, but im unsure of turbo size.

the engine is a 3lt v6 i want to run a twin setup.

i would like to get full boost at  least 2000rpm as my redline is 5750rpm.

my goal is to run a max of 8 psi but closer to 4-6 psi for everyday.

thanks mr 32

<{POST_SNAPBACK}>

what kind of power are you after and what's your budget?

[BHDave]

For twins on an engine of that size with that sort of response you are really looking for something pretty small.

A pair of turbos of a Z32 300zx maybe could do it though you may find the response will be significanly worse on your engine than the VG30 due to lower efficiency. Due to your low rev limit they may be a bit big to be honest.

You could even go a pair of T2's off an old ET pulsar. It was 1.5 with 2 valves/cylinder. They are pretty old though so would require rebuilding. There may be a new version of it for sale by garrett.

[mr 32]

my budget for just turbos is about 2000-3000

the engine will be fully rebuilt.

power wise about 75hp increase.

im more intrested in the torque.

[Col-GTSX]

I wired a v6 magna twin setup and the owner (a chick, was really suprised, but anyway) They decided to use a pair of pulsar turbos...

It was pretty good. However i ran out of puff before redline and it was a 3 litre magna 94 model or so. The last of the old shape.

In her case a pair of VG30's would have been ideal i reckon. In your case this setup would be ok. Pulsar turbos....

You would have to go smaller again to get boost at 2000rpm.

Maby a pair of crapichino turbos would suit your application. Have fun with the exhaust manifolds... There is where most of your money will go...

[Roy]

What sort of Pulsar? Id be thinking stay away from scary early - mid 80s turbos. Crappy design, crappy bearing setup, crappy cooling, and that was when they were new. If they are off the GTiR or somehting, excellent, but i would consider some cheap R33 GTR turbos that have been binned for aftermarket about perfect for what you describe

[Kaido_RR]

maybe look at SC?

[RS500]

i thnk the rb20det turbos should be good for mid range power/torque, and they're cheap aswell.

[mr 32]

i think the capuccino turbos will be two small as they run off a 660cc engine. the gtr turbos or rb20's might be the go what is the chance of failure at my boost levels?

Edited December 23, 2005 by mr 32

[lordsnipe]

i don't reckon you'll get full boost (4-6psi) at 2000rpm with gtr or rb20 turbos.

a gtr can't even get full boost at 2000 rpm.. and you want to put those or 2 rb20 turbos on? hmmm....

[MANWHOR3]

for 2000-3000 you will get nothing. Once you get the custom exhaust and intake manifolds, oil and water lines made etc, it will be 2-3000.

Keep in mind that if you want "full" boost by 2000 rpm, the turbos will have to be very small. It also depends on what you define as "full boost". e.g. if you say 2 psi is full boost, sure, you might even be able to get a 3040 to be on "full boost" by 2000 rpm.

Keep in mind that the capri 3L motors are shit. To further that, if you run twins, you'll only have 1.5L 3 cyl pushing each turbo. Keep this in mind. an rb20 has a tiny turbo. yet it won't even hit 10psi by 2000rpm. That is on a 6 cyl 2L.

If you were to use 2 of those turbos, you'd probably expect 10psi by 4000+ rpm.

keep in mind that it's not just the cost of turbos, as mentioned aboe, there are manifolds. piping, intercooler. ecu. injectors. fuel pump. fuel pressure regulator.

the extra power will probably kill the stock gear box and diff. so budget for that.

The budget is not 2-3000 for a twin turbo setup. Think more along the lines of $15000.

I know you didn't ask for opinions, so I won't tell you that it's not worth it.

[mr 32]

like i stated early my budget of 2000 3000 is just for the turbos alone. the exhuast is already a dual 3inch. the manifolds i will make myself in the workshop along with dump pipes. the gearbox is in the process at the moment which will be an adapted toploader with a ford nine inch. the engine is due for a rebuild so it will be done specially for this application. and the intercooler is a pwr air to water unit. i will also do the fual and ignition systems.

mr 32