Engine/Transmission (1994 - 1998) Paging Mr. Donnelly..... Blow off valve vs Wastegate....need an education!

[AH64ID]

It's unfortunate that there aren't more VGT options, but I suppose it is what it is... Even on the 6. 7 where the controller came stock there aren't too many options and most ditch them.

I think a GT3788R with a variable housing would be a great turbo, and if you could open it enough (30cm??) you could use it for tow twins without needing an external gate, but it would have to go WAY open. . . and closed since an exhaust brake is mandatory IMHO...

But back to what the OP's first question was about. A BOV isn't what you are looking for, and only a DP gauge will tell you if you need a WG. If you find you need one then I would put a gated 12cm housing on there, your response will be night and day different.

 

[cerberusiam]

Yep, the range for VGT operation is small and it is complicated. The other big drawback on a 12V is they will soot and stick. Even on a cleaner burning 6. 7 they stick if ones doesn't drive them hard. Which, in the end, is contrary to efficiency and the cost of diesel.

 

[RustyJC]

Even on a cleaner burning 6. 7 they stick if ones doesn't drive them hard. Which, in the end, is contrary to efficiency and the cost of diesel.

Not required at all. Just keep the exhaust brake on. The closing of the nozzle ring on deceleration and opening on acceleration keeps soot from building up.

Rusty

 

[RSchwarzli]

Thanks for all the replies. Good discussions to ponder too!

Now to do some pondering on my end.....

 

[cerberusiam]

I for one would really like to see the boost vs DP in that setup across the operating rpms. Every setup varies a bit and would be extremly enlightening to see what you have.