BlackSheep5

isnt "turbo bark" from compressor surge when you let off the throttle?

RowJ

You should not need an External WG. You have dual by-pass ports right? Only used, as far as I have seen, to wastegate a non wastegated secondary turbo. In that case it's mounted on the exhaust manifold and plumbed into the primary hot pipe.

I agree with KP. Blow off valves are no where near as efficient as an external wastegate, in controlling higher boost levels. BUT, if you add twins, and have not yet done head work, it's an easy, cheap, short term way to protect your head gasket.

RJ

RowJ

I ran a Tial 38mm Ext Wastegate on a KSB-1, rated to 425 hp. The Ext WG took me comfortable to almost 500 hp and worked flawlessly. Tial uses a regulator and is fully adjustable.
http://www.tialsport.com/

RJ

98.5POS

RJ -- Where did you mount your ex WG? Inlet on the hot pipe between the two turbos and outlet???

RowJ

Sorry, guess I did not say it very clearly. I ran an Ext. WG before I got twins...when I had a single KSB-1. By passed exhaust directly into down pipe with 2" flex pipe.


RJ

98.5POS

looks great, thanks! I suppose that WG is ajustable? Thanks again.

D

RowJ

Yup! Full boost pressure bleeds off to bottom of Tial WG and fights a 21 psi spring. Regulated boost runs to top of WG and adds pressure up to full boost in helping the spring and exhaust valve stay closed! So you can have anywhere from 21 psi boost up to full boost, unregulated from the turbo.
Worked slick!


RJ

98.5POS

What does that tubing on the outlet port of the turbo do in the photo?

silverbullet830

so diesels don't have a throttle body???? new to this stuff......

TheBigNasty

Nope. Diesels don't have any throttle blades. A blow off valve is used to blow off the pressure that is there when you slam the throttle body shut on a gasser and is actuated by vaccum. A pop off valve is there to control the pressure and is operated by springs so to speak.

98.5POS

Any other ideas on brands of wastegates that I could look into other than Tial and Turbonetics? I want make sure I cover all my bases here. Thanks.

D

silverbullet830

yeah i mean i definately know about gas engines and how turbos work on them (new to diesels) but i had no idea theres no throttle body or any throttle blades at all. how does the throttle work then? and just to add to what yall have said the reason blow-off valves are used on turbocharged gas engines is when the throttle closes the pressure spikes between the turbo and intake and blows back through the turbo. venting that makes things last longer and in race applications (or where ever you might be off and on the throttle quickly) it allows the turbo to keep spinning so that when you get back on it's either already making boost or **** close. don't think thats much of an issue with diesels though.

98.5POS

The throttle adds fuel which in turn creates more need for air which the turbo takes care of. The more fuel you put to it the more boost pressure you'll get. Diesels only need fuel and air to run.