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Carbon Emitter
 
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76 930 wastegate adjusted all the way out...why and what to do.

Im helping a friend who inherited a long stored, very original 76 930. After going through the entire fuel system, I noticed the wastegate was adjusted all the way out. Why would someone adjust it this way? What should I do to correct it before running the engine?


Old 03-22-2018, 05:43 PM
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Rawknees is the only guy I ever known to be sticking straight out like that. That thing will poke your eye out. And clearly unprotected. Be careful, he's real dangerous when he gets excited like that.
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Last edited by slyguy; 03-22-2018 at 06:05 PM..
Old 03-22-2018, 06:01 PM
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That's not a factory adjustment (there is none), it is a bolt plugging the boost vacuum port
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82 930 Pearl White 3.3 964 cams, K27 HF, Kokeln, fuel enriched, IA fuel head mod, wur mod, crankfire, 2X plug, Aase worked heads. 1bar, GHL, zork, 23/33 bars, low, loud
Old 03-22-2018, 06:04 PM
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That is a homemade boost controller. Normally that port is vented to atmosphere (allows the diaphragm to move under air pressure supplied to the side of the bell). Originally there was a metal tube screwed down there that went up through the engine tin and into the engine bay (to keep water from getting in there). One simple thing you can do is put a hose barb fitting in place of that nut/bolt combination and then run a hose up and into the engine compartment.

By the way, someone made that modification in order to run higher than stock boost - not a good idea if nothing was done to monitor and adjust fueling (onboard AFR gauge and adjustable WUR).
Old 03-22-2018, 06:05 PM
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Quote:
Originally Posted by slyguy View Post
Rawknees is the only guy I ever known to be sticking straight out like that. That thing will poke your eye out. And clearly unprotected. Be careful, he's real dangerous when he gets excited like that.
Can't be me as the car is not lifted way up in the air on the left!!!
Old 03-22-2018, 06:06 PM
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Can't be me as the car is not lifted way up in the air on the left!!!
sounds like a little air jack going on here
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82 930 Pearl White 3.3 964 cams, K27 HF, Kokeln, fuel enriched, IA fuel head mod, wur mod, crankfire, 2X plug, Aase worked heads. 1bar, GHL, zork, 23/33 bars, low, loud
Old 03-22-2018, 06:12 PM
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Quote:
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sounds like a little air jack going on here
Hot air?!?!
Old 03-22-2018, 06:26 PM
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Hot air?!?!
Free flow? through the missing wastegate nipple? sounds nasty
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Old 03-23-2018, 07:31 AM
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Free flow? through the missing wastegate nipple? sounds nasty
That was funny .....
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Old 03-23-2018, 08:10 AM
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76 930 wastegate adjusted all the way out...why and what to do.

Extremely dangerous place to ask for advice.
The answer is seldom what you expected with this group.



Sent from my iPhone while Driving
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Old 03-23-2018, 09:34 AM
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Haha I don’t mind the funny replies.

Thanks for the helpful info Rawknees...I’ll replace the bolt with a barb as you suggested. The wastegate internals won’t be affected by converting back, correct?

Last edited by jkarolyi; 03-23-2018 at 08:12 PM..
Old 03-23-2018, 07:26 PM
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Quote:
Originally Posted by jkarolyi View Post
Haha I don’t mind the funny replies.

Thanks for the helpful info Rawknees...I’ll replace the bolt with a barb as you suggested. The wastegate internals won’t be affected by converting back, correct?
That's correct - no effect on internals.

The purpose of that bolt is to limit the amount of movement from the diaphragm, and thus the spring and valve, buy blocking, or lessening, the flow of air out of the "bell" (the topside of the diaphragm) - a crude boost controller/increaser.


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Free flow? through the missing wastegate nipple? sounds nasty
Nasty is the only way I roll, bro (well, other than kinky, too!)!
Old 03-23-2018, 09:47 PM
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That will up the spring pressure to increase boost. It will add more preload on the spring. But it still needs to be vented or it can be erratic. I drilled a hole through the bolt. Did this for years


Last edited by turbo nut; 03-24-2018 at 07:15 PM..
Old 03-24-2018, 07:12 PM
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