a little broblem. turbo A : compressor A/R .70 and exhaust A/R .63 turbo B : compressor A/R .50 and exhaust A/R .70, but with douple in . so needs pulssive exhaust manifold ( no problem ) . now my question is : is it turbo A or turbo B, that spools quicker ? same size wings on both turbos .

smaller compressor housing the better the spool up.

Ross

i would have thought the exhaust housing had more to do with spool up as thats what the exhaust gasses are spinning first whereas i would have thought the compressor housing affects how quick the boost builds ect

Its the compressor housing. Exhaust housing depends how much top end power you get. This is my understanding.

Ross

what im trying to say is that for your compressor to work it needs to be driven by your exhaust turbine yeh?so if you have a large housing with a relatively small exhaust turbine there isnt going to be enough pressure to drive the exhaust turbine round and therfore turn the compressor wheel whereas you make the housing smaller to the size of the turbing and therefore more pressure of exhaust gas to drive both turbines

A : comp .70 exhaust .63 B : comp .50 exhaust .70, but with douple in. I think that B turbo spools quicker, there is little bigger exhaust side, but its with douple, so ... and comp. side is smaller...

whats double in?you mean a double or split pulse inlet?if so you cant really compare 2 turbos like that

I mean these turbos are exactly the same, but : other has .50 comp side and .70 exhaust with splitted housing.. or something ( my english) so it needs pulssive exhaust manifold. theres gonna be new manifold, so thats not a broblem, I m just wondering is the A or the B better

well i think B will spool quicker but wont produce as much power as A

why.. ? same size wings and B has .70 exhaust side ( A .63 ) is it because of that compressor side ? B= .50 A= .70 ?

Compressor side is the one to worry about.

Ross

turbos have 56,5mm comp and 58,5mm exhaust .. good for over 400hp .. ?

go to ray hall turbocharging
and read about compressor flow maps and a/r ratings,easier than me trying to explain

Flow maps mean jack dude. Sorry but it all depends on the car the flow graph/map was done on. For instance the gt28r is rated to 280bhp IIRC. Yet there is 10+ people on the forum who have higher than that with the same or lesser turbo.

Ross

thinking that turbo for my 16v turbo... and +400hp

there is another hmm lets call it turbo C ... it has 56mm exhaust .63 A/R and 58,1mm comp. .50 A/R is that too small for 400hp ?

flow maps mean alot!looking at a flow map can tell you how a turbo will work on your car but obviously you need to know certain things about your car like how much air it can get in ect

http://www.scara73.it

for 400BHP you could do with looking at the GT30 series turbo's

this turbos costs only 575e, so garrett would be at least double price ? they are master power turbos A= mp 802128 B= 810003 C = mp 810021

http://redlineracer.org/estore/html/page-view.asp?menuid=71 B turbo

http://redlineracer.org/estore/html/page-view.asp?menuid=70 C turbo

http://www.futurez.fi/webshop/product_details.php?p=2109 A turbo

so the best one for good spooling and +400hp ? I'm gonna use different cams etc....

Hard to comment on spool up / suitable turbo as there doesnt seem to be any compressor maps to look at

You can't buy a turbo without look at the map first.

You can't buy a turbo without look at the map first. then we cant buy these, because I havent seen any maps available ..

Well that was kinda mine and Begbie's point you need a map in order to plot how it will perform otherwise your just guessing. The turbo is very important buy the wrong one and you'll forever regret it. If you ask me I would only buy genuine Garrett.

http://koti.mbnet.fi/hi-po/pics/masterpower/ masterpower vs garrett

http://www.masterpower.com.br/eng_frameset.htm read there.. these are good products