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Author Topic: When is an external wastegate required?  (Read 5816 times)

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Offline SuperSix

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When is an external wastegate required?
« on: April 04 2011, 12:15:38 PM »
I am tinkering with the needed parts to get the new GN running, and one of the things it needs is a downpipe.

I saw this over "there"..
http://www.turbobuicks.com/forums/parts-sale/96902-large-list-remaining-v8-swap.html
279 downpipe 3" cottons performance for external wastegate, used
500 rg-45 external wastegate used

Prices are what he paid, not what i would offer.

At what point is an external wastegate required or help? I don't plan on racing much at all (at the track at least)

Car specs are:
PT51
030 bore
202/202 cam
RJC Powerplate
Mototron 06's
Chip from Eric
3" singleshot from Cotton
Airbags
10" converter
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Offline Scoobum

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Re: When is an external wastegate required?
« Reply #1 on: April 04 2011, 07:58:44 PM »
You should be able to control boost easily with an internally gated DP with the PT 51 you have. RJC now sells a larger puck to help control boost with the larger turbos. I've run as high as 24 PSI with my 70 and my RJC internally gated DP...with no boost creep. Norbs and I had to do some wastegate porting to achieve this tho.
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Offline Steve Wood

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When is an external wastegate required?
« Reply #2 on: April 04 2011, 08:34:05 PM »
maybe in the nines?
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When is an external wastegate required?
« Reply #3 on: April 04 2011, 08:39:49 PM »
Quote from: "Steve Wood @ Mon Apr 04, 2011 7:34 pm"
maybe in the nines?


You'd be correct Steve. I found a pic of Grumpys car with the hood up that ran the 9. It's got an internally gated DP...and I believe he ran a 67...and prolly up around 30 PSI.
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Offline Steve Wood

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When is an external wastegate required?
« Reply #4 on: April 04 2011, 09:41:32 PM »
or more  LOL
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Offline SuperSix

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When is an external wastegate required?
« Reply #5 on: April 04 2011, 09:42:18 PM »
OK, Thanks. Aside from looking cool, it's a waste of $$$.

Anyone have a DP for sale? :P
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'87 GN, 60lb, TA49, THDP, FTP cam, T+ lots o' shit - SOLD
'07 Ford F150 Lariat 2WD, 5.4L 3v - 255k
'20 Kubota BX2380. FEL, 60" deck
'78 IH/Case 184 Lo-Boy
'99 Kawasaki Bayou 400 4x4

Offline Scoobum

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When is an external wastegate required?
« Reply #6 on: April 04 2011, 10:27:53 PM »
Quote from: "SuperSix @ Mon Apr 04, 2011 8:42 pm"
OK, Thanks. Aside from looking cool, it's a waste of $$$.

Anyone have a DP for sale? :P


A word to the wise. If you can't find an authentic used THDP...then I highly suggest you buy a 3" DP from RJC. Buy once...not twice...like I did.
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Hard work pays off, dreams come true. Bad times don't last, but BAD GUYS do!

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Offline SuperSix

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When is an external wastegate required?
« Reply #7 on: April 04 2011, 10:43:41 PM »
I haven't heard than name in awhile, Kinda like Mease.
Thanks, I will look into one.
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'87 GN, 60lb, TA49, THDP, FTP cam, T+ lots o' shit - SOLD
'07 Ford F150 Lariat 2WD, 5.4L 3v - 255k
'20 Kubota BX2380. FEL, 60" deck
'78 IH/Case 184 Lo-Boy
'99 Kawasaki Bayou 400 4x4

Offline $1987 GN$

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Re: When is an external wastegate required?
« Reply #8 on: April 04 2011, 11:28:30 PM »
...
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Offline Grumpy

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When is an external wastegate required?
« Reply #9 on: April 08 2011, 04:35:20 PM »
Quote from: "Steve Wood @ Mon Apr 04, 2011 8:41 pm"
or more
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Offline G. Price

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When is an external wastegate required?
« Reply #10 on: April 09 2011, 07:10:22 AM »
...
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Offline Steve Wood

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When is an external wastegate required?
« Reply #11 on: April 09 2011, 09:31:21 AM »
On what planet, Dan?  :D
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Steve Wood

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A lot of broken parts does not make you a racer; it makes you a slow learner.
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