Country Boy

iTrader: (24)

How much power wil a 38mm gate hold? Im looking at the Turbosmart 38mm.

engineermike

You can make as much power as you want with a 38. Now, keeping the power down is another issue. Wastegate sizing is a bit of a black art. I can tell you that my 40 mm worked just fine at keeping my T-76/360,383,388 down to 12 psi. . . that is until I improved my cat-back. I switched from an Aerochamber to a Magnaflow and now I can't get the boost below 16 psi. Later on, we built a T76/377 with a JGS 44 mm and no exhaust at all and it would go all the way down to 6 psi. It depends on the turbo, cid, desired boost level, and exhaust backpressure.

More exhaust backpressure -> smaller wastegate
More boost -> smaller wastegate
Larger cid -> smaller wastegate
Larger turbo -> ???

Country Boy

iTrader: (24)

wow... I was hoping to get boost down to about 5 psi when I want. Ill typically be running about 10 or so with stock CI and a T76.

KraZy

iTrader: (4)

I dont think you'll be able to boost down to 5lbs w/ a t76 with a wastegate that small.

TransAm6383

iTrader: (1)

I heard Jose from forced inductions got his t-88 down to 6psi and it held with a turbosmart 38mm WG and that it was a MUCH better unit than Tial

Country Boy

iTrader: (24)

now thats what I want to hear! I was told a Racegate would work with a P*S kit and it doesnt. It has a bigger flange than the standard. Anyone need a barely used Racegate?

ddnspider

iTrader: (26)

i can get my 383/T76 to 6-7psi. i have a Tial 44mm

longrange4u

iTrader: (2)

Just got a Tial 44 for my 88 setup

NOSjohn

iTrader: (9)

I would recommend at least a 40-44mm for a 76mm turbo. Tial is really good as well as Turbosmart...the latter being more expensive.

Country Boy

iTrader: (24)

See the problem is, the kit is amde with 1.5" tubing for the wategate which equals 38mm. So, anything over 38mm is a waste and Im not redoing the whole wastegate piping. I also have to have the 2 bolt flanges.

Dragframe

iTrader: (14)

Well bro... im under the same situation and i just went with a JGS 38mm from Jose... stock 350 LT1/T76 and im aiming for a wee 6 psi at first. I hope all goes well!

1a-play

iTrader: (9)

countryboy I have a turbosmart 48mm laying around- pm me if interested

Country Boy

iTrader: (24)

Id love to have the 48, but it has V band flanges

DrTurbo

iTrader: (3)

Call Jose and get the new JS 40mm gate. It flows ALOT and will bolt right up in the current spot.

NOSjohn

iTrader: (9)

^ I agree, try the new JS waste gate in a 40mm. Big turbo and low boost, you need something that will keep that valve closed, you may need a bigger W/G. I'd say, try it at first and see if you can get down to 6 or 7 psi comfortably.

TransAm6383

iTrader: (1)

where do I find a JS40?(what is it?) and you say its the same size as a tial 38mm??? Im looking to go down to 10psi on my T76....no lower...and i was told the tial would be too small.

Country Boy

iTrader: (24)

I just picked up a brand new Tial 38mm for cheap so ill see how that does.

DrTurbo

iTrader: (3)

We typically have them or can get them. Just give Jose a call.

engineermike

I can testify that the JGS 44 is quality.

DrTurbo

iTrader: (3)

I think Jose is working with JG on the new 60mm BFG WG. They are testing them on diesels since they are really designed to work well with them.