38mm wastegate?
TECH Addict
Joined: Jul 2005
Posts: 2,153
Likes: 3
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 -> ???
More exhaust backpressure -> smaller wastegate
More boost -> smaller wastegate
Larger cid -> smaller wastegate
Larger turbo -> ???
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?
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
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.
Originally Posted by Country Boy
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.
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!
^ 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.
Originally Posted by TransAm6383
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.