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rdjohnston50 · Posted: Fri Jul 20, 2007 11:42 pm Post subject: Wastegate mods

I've read about the wastegate mod which uses a different spring and diaphram to increase boot up to 8 or so. Whats a source for these parts?

924guy · Posted: Sat Jul 21, 2007 12:10 am Post subject:

diaphragm is the same, spring update is a 930 unit, from .7 bar to 1.2 bar . i stuck in a 1.1 bar spring , but without other upgrades like an Intercooler or water injection, its pretty much over kill as i have to keep the boost dialed down. i can easily hit the boost cutoff at 25 psi, i tried to keep it below 17psi. since stock boost is 7psi... its a rush. after the rebuild i will probably keep it at a much more conservative 10-12 psi. i wasnt to worried about blowing anything up before, needed a rebuild anyhow. on a fresh engine ill just have to learn to be a bit more responsible in my boost usage

I got my parts from Andial, however they may be more difficult to source, these items are getting harder and harder to find.
_________________
Eric
78 924
82 931 SE "smokey"
99' VehiCross
Y2K Honda Insight
http://www.cardomain.com/id/924Guy
Performance by Pasha

rdjohnston50 · Posted: Sat Jul 21, 2007 1:46 am Post subject: wastegate mod

Thanks for the info. I was thinking of limiting the mod to a stiffer srping. I'll check out Andial though.

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

I have a Weltmeister 1.0 Bar spring for sale. Make me an offer.
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

rdjohnston50 · Posted: Sat Jul 21, 2007 11:34 am Post subject: wastegate mod

back to 924 guy - so if I check out a diaphragm and 1.0 spring for a 930 wastegate, they will fit the wastegate in my 82-924? I see lots of available parts for the 930.

Paul · Posted: Sat Jul 21, 2007 1:39 pm Post subject:

It's the same wastegate as a 930, but a 1 bar spring is too much for a stock 931.
_________________
White 87 924S "Ghost"
Silver 98 986 3.6l 320 HP "Frank N Stein"
White 01 986 "Christine"
Polar Silver 02 996TT. "Turbo"
Owned and repaired 924s since 1977
Porsche: It's not driving, it's therapy.

jazz guy · Joined: 26 Nov 2002 Posts: 434 Location: Colorado

Paul is right. Without a IC or water injection, 1 bar is definitely pushing it. On hot days, it is doubtful that you'll be able run boost that high without the risk of engine damage.

You might consider a variable boost controller, then you have some control over boost limit. There are some cost effective options for you. Take a look at the following thread if you are interested, it talks about several options.

http://www.924board.org/viewtopic.php?t=5373&highlight=boost+controller

Cheers, Brian

924guy · Posted: Sat Jul 21, 2007 11:23 pm Post subject: Re: wastegate mod

924guy · Posted: Sun Jul 22, 2007 10:15 am Post subject:

some pics i had from the last time i messed with this stuff..

the white spring is the 1.1 bar, vs the original.

_________________
Eric
78 924
82 931 SE "smokey"
99' VehiCross
Y2K Honda Insight
http://www.cardomain.com/id/924Guy
Performance by Pasha