20B-3Rotor

I am about to order my single turbo and i just wanted to see what you guys would use for the A/R (.91, 1.15 or 1.34)

My engine is street ported

My buddy has a 46mm tial wastegate for sale would that be good for my setup

Thanks for any info

t-von

iTrader: (8)

If you want fast spoolup, go with the .91. However, you will more than likely choke the engine out at higher rpm's. If you want hugh hp figures, go with the 1.34(I would.)

crispeed

If it's a GT-42 turbo the turbine wheel is pretty huge so if it's a daily driver stay around the 1.15 housing. I just finished installing one on a 2JZ supra and it did not make full boost (19psi) untill 6000rpm with the 1.15a/r housing. It made 640rwhp at 19 psi.
BTW. This was the larger Garrett trim of the GT-42 turbo (74mm compressor inducer) with dual ball bearings.

Zero R

iTrader: (1)

I would run the 1.15, I think if you look around deep enough, you can find a 1.06. if your looking for a little quicker spool.Throw on the uprated comp wheel and you'll be all good, you should see 15lbs rather quickly under full load.This would be with some good porting work of coarse. If not I'll let you know how it works on my car cause that's where I'm headed.

-Sean

Zero R

iTrader: (1)

Doesn't that seem a little large for that car? I'm asking because I want your opinion it would seem to be awfully laggy.

13BJCCosmo

115 man....it's proven itself...or a 122

94RHDFD

iTrader: (3)

I'm doing a Garrett T-76 w/ 1.15 A/R, I agree with t-von a .91 would choke the engine. I think anything smaller than a .96 is to small, and a .96 may be to small itself

t-von

iTrader: (8)

Anyone know "about" how much boost this turbo would produce with the 1.15 at 3k rpms? Also wouldn't a 20b spool this turbo faster than the Supra engine? I'm asking because I can't find any dyno info with this turbo on a 20b

felix_is_alive

dude the 2ob itself has alot of torque so i wouldnt worry about lag i would defenetly go for 1.34 stay away from .96 .91 etc remember 20b`s make a ton of heat not to mention the raw exhaust pulse now imagine all that exhaust energy going through that small .91 .....can you say ugh ugh choke

20B-3Rotor

Thanks for all your help

Turbo 3

iTrader: (3)

I believe Dragon is also running a T-76 with a 0.96 and is getting 20psi at 2-3K if I remember correctly. But then again, he's built the car for drag racing primarily.

t-von

iTrader: (8)

I kinda figured so. The problem is, when ever I get a chance to look at 20b dyno sheets(with singles), the sheets I've seen only show hp #'s. Also our cars always do their pulls from 3rd gear. Because of this you never get to see how much torque is available below 3k rpm's. Thats why I asked about the boost at that low rpm.

felix_is_alive

true ....now you mention it very true ....cant give actual figures but damn thing sure feels strong at low rpm

IGY

No, he is running the 1.3x Q on a stock block, and hitting 16psi at about 5600rpm's(way to late on the 20b). The same motor and turbo except with a .96 Q was hitting 16psi around 3200rpm's in the FC it came out of. I told Dragon to change to the .96, and he said no, because he would rather build the motor.

monster007

The GT42S (74mm comp) with a 1.15 turbine started too spool at 3400RPM on a VW VR6 and full boost was a 3800RMP made 596hp at 20psi. Boost response was about the same as the T66 it replaced, and on the Honda (drag car) it came in at 4800rpm full boost is at 5200 rpm this a full 1000rpm sooner thenthe TS04.
These are the non ballbearing GT42's. Great turbo.

streetpower

and cheap too

Sponge Bob Square Pants

I also suggest 1.15. With a good ported 20B it should spool it fast enough... maybe even a bit large housing like a 1.22, but probably no bigger on the street. 1.15 is good.