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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

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Old 05-22-2007, 12:55 AM   #1 (permalink)
farmboy1989
 
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homemade mechanical wastegate.

What is the approximate legth of spring I will need and how many pound of resistance should I have of a spring for a gm-8 turbo? I want to have 15 psi peak. When i was running at 60 mph in od and I stomp it I could peg it at 15. I would also like it to be somewhere in the 4psi range at 55 mph. Thanks!

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Old 05-22-2007, 09:49 AM   #2 (permalink)
4DR4X4
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I just drilled a hole in the lever on the turbo, and the bracket on the factory vaccum pot for a spring. i'm gonnna try it and see if it holds that way, and see if boost will open it up like a standard turbo dump valve. i'll post some pics when i get a spring stuck on it later today.

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Old 05-22-2007, 10:42 AM   #3 (permalink)
Dave12
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Have a look in My Garage. The spring is about 4 inches and the compression is pretty stiff. Sorry I can't give you any kind of exact number, but it has to be fairly difficult to squeeze bewteen your fingers.

You do have a boost gauge right? If not, don't even bother with a homemade set up. There will be no way of knowing what boost you're producing.

Dave
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Old 05-22-2007, 10:46 AM   #4 (permalink)
jifaire
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Aw, c'mon Dave ... let 'em try, let 'em try...

We haven't had a good explosion story around here in a long time...

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Old 05-22-2007, 10:47 AM   #5 (permalink)
chrisk1500
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Do a search for goldsburg....he has posted the numbers on the spring you are looking for...
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Old 05-22-2007, 05:43 PM   #6 (permalink)
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Quote:
Originally Posted by jifaire;1788008;
Aw, c'mon Dave ... let 'em try, let 'em try...

We haven't had a good explosion story around here in a long time...

You are an EVIL....EVIL man jifaire!

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Old 05-22-2007, 07:07 PM   #7 (permalink)
jifaire
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[quote=Dave12;1788594;]You are an EVIL....EVIL man jifaire!

(acting out charades game...)

What's that? OK, it's a 2-syllable word.

First syllable: sounds like cat? only 2 letters? at? Ca? KA!

YAY... second syllable... sounds like room? Ka-room? Ka-zoom?

Oh, I get it! Ka-Boom!

ROFL....

Playing around with springs, wastegates, and 6.5 litre firecrackers is not a task for the faint-of-heart.

You can either pay the money to buy a turbomaster, or pay the money to buy a boost gauge.

Doing both is OK, but I wouldn't recommend doing neither.

There are lots of places to save money. This isn't one of them.
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Old 05-22-2007, 08:39 PM   #8 (permalink)
Goldsburg
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Quote:
Originally Posted by chrisk1500;1788010;
Do a search for goldsburg....he has posted the numbers on the spring you are looking for...
Well...sorta!

McMaster-Carr: 9573k27;chrome-silicon steel die spring with 50lbs/in

I did now!!!!

With this spring, I am at about 0.5" of pre-compression to get my homemade T/M to generate 10PSI, but your results may vary. JIFaire hit it right on the money though: Make sure you have a boost gauge when setting this up...

Regards,
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Old 05-22-2007, 08:43 PM   #9 (permalink)
jifaire
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Quote:
Originally Posted by jifaire
You can either pay the money to buy a turbomaster, or pay the money to buy a boost gauge.

Doing both is OK, but I wouldn't recommend doing neither.
OR, you can ask Goldsburg ... LOL ... I surrender!
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Old 05-22-2007, 11:45 PM   #10 (permalink)
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Yes I do have a boost gauge, thats where im coming up with the numbers I'd like to have. I want to be at peak performance, but stay in the non destruction zone.

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