he351 spring style wastegate actuator

I'm still trying to get around to building one of these. Something to consider is that the flapper can open fully before the spring coil binds.

I'm assuming you guys are just towing and WOT runs with them and just tweaking them to change/monitor the results?

-Dustin-
 
I saw this pic Vaughn McKenzie posted up on NW Bombers forum. Looks like his set-up pulls the spring instead of pushing. No coil bind. Looks like the way to go.

01HE351upgrade1.jpg


His post is here:

Board Message
 
Looks to be a pain to adjust, but some stout brake springs will do the job for sure,
 
Does look to be harder to adjust. These are simple to make, the only part is welding to the housing. I could make some of these up ready to weld on if someone was interested.
 
Lots of ways to skin a cat, just depends on how you want to set it up. I'm thinking the way mine is just a couple turns of the adjuster nut gains 12 to 15 lbs. A little is a lot but it's still easy.
 
Thanks for the pic and link BigPapa. I now have a use for all those left over transmission springs.
 
Figured I would add my design to the mix, hopefully the adjustments won't be too much per step.. Can elongate the holes if need be..
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It works just fine, 2.5 to 1 pressure ratio on this turbo and almost a 2 to 1 on the big turbo.. If I redo it it will have more adjustability.
 
Cool.... I just got a gt42, so im lookin at getting rid of my super b special and running a 351/gt42 setup. I like your spring idea, cuz if i decide to run the 351 as a secondary id like to be able to reclock the comp housing
 
ive got my he351 setup just like what big papa posted. i used a 5lb spring that was close to 8" long and i simply hooked it over the compressor outlet hose clamp bolt. the current setup works great to limit the 351 to 30-32lbs of boost. i had tried using a much stiffer brake spring, however it was causing surging on WOT acceleration b/c as the trans shifted and rpm changed the tight brake spring would slam shut then re open. no surging to speak of with the current spring though.
 
24vriviera said:
It works just fine, 2.5 to 1 pressure ratio on this turbo
Click to expand...

Thats way too high. A decently matched turbo will be in the 1-2:1 range.

A wastegate spring is a terrible idea, you have no control or limit to boost. Easy way to overspeed your turbo.
 
Tormentor said:
Thats way too high. A decently matched turbo will be in the 1-2:1 range.

A wastegate spring is a terrible idea, you have no control or limit to boost. Easy way to overspeed your turbo.
Click to expand...


are you serious?
 
He's always off his rocker......... These are pretty sweet setups.. Basically drive pressure actuated wastegates.
 
Tormentor said:
Thats way too high. A decently matched turbo will be in the 1-2:1 range.

A wastegate spring is a terrible idea, you have no control or limit to boost. Easy way to overspeed your turbo.
Click to expand...

really? i was running more boost with my diaphram style wastegate actuator, and i now have no boost spike. get read up buddy.
 
24vriviera said:
get read up buddy.
Click to expand...

Please do.

If it actually worked worth a crap then there would be an OEM that actually uses it.

Think about it:
Exhaust pressure is limited= Slower spoolup
Boost pressure is not controlled= Lower top-end boost, excessive/lacking boost in the rest of the range

and i now have no boost spike
Click to expand...
That means you had a problem with your actuator or a leak. A non-ECM controlled wastegated should not spike.
 
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