london

going to use a T70 Q trim dual bb turbo on a 20b ,what AR do you guys recommend ,motor is street ported,also exhaust is also ported.Is 1.32 good enough or should i go bigger.

RETed

Boy, wouldn't you like to know...


-Ted

RoTaRyBoYz

street ported 20b in trinidad??where?? by who??wah car?? fella i have ah GT42 BB with a 1.22 A/R , it'll be on a street ported 20b...i think anything larger than a 1.22 is not streetable,plus you'll never hit full boost on the little streets of trinidad with that 1.32 u might end up in a canefield somewhere

94RHDFD

iTrader: (3)

I agree with RoTaRyBoyZ, I'm running a T76 with a 1.15 A/R ,a 1.32 is to big, unless there is somewhere you can open it up.

london

come on tell me what size ted,and its going in a 2nd gen ,and you would be suprised to know we have a lot or roads here to open up a 20b,and i think 1.15 is too small ,running a 1.15 right now on my T66 on a 3rd gen motor.Oh yeah its running an E11 too.

Sponge Bob Square Pants

So if you think a 1.15 is a bit small, and everyone here thinks a 1.32 is a bit big, then it should be pretty easy to figure out a good size!

RETed

The whole secret surrounding turbo sizing is what makes a tuner (and shops) able to charge big money for their expertise.

Personally, I think your T70 (compressor) side a bit too small for a 20B, especially a ported one.  With the larger 1.3 turbine A/R, it should make nice power, but probably limited to about 600hp.

The T76 is a much nicer match for the 20B...


-Ted

t-von

iTrader: (8)

So do you have an opinion of the GT42 bb that RoTaRyBoYz will be using? Thats one of the turbos I was considering for my 20b as well.

RoTaRyBoYz

after reading alot of old turbo threads & talking to alot of folks, i figure the GT42 with 1.22 A/R would be good for 800hp and still be streetable....$1000 non BB and $1800 dual BB , u cant beat that

RETed

We haven't looked into the new Garrett GT-series stuff, as data is sparse and direct experiences are very limited.
Not to mention these things are expensive!


-Ted

felix_is_alive

i believe it depends on what kind of boost you are planning to run ,say at 15 psi i think the 1.15 will be just fine but say you run higher boost ,say 20psi, the 20b generates a lot of heat (also youre ported) so i would feel more comfortable with the 1.32 turbine so the engine doesnt "choke" at higher boost levels ,
btw i agree with REted the t76 is a nice match for the 20b ...thats what i got

t-von

iTrader: (8)

That's what I was thinking. Were did you get the BB version for $1,800? That sounds really cheap!

94RHDFD

iTrader: (3)

Agreed. I suggest'd the 1.15 because I'm not planning on running more than 17psi, so it should spool very nicely.

RoTaRyBoYz

dude i sent u a PM

Sponge Bob Square Pants

Send me info too (I'm more interested in non-bb though)

racedriver

i am also iunterested in the gt42. Can you send me the info?

london

where can i get one of these housings reasonable to purchase

felix_is_alive

i believe turbonetics carrys them