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03-14-2020, 11:39 AM
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#1
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Name: okish
Title: Too Much Time
Status: Not Here
Join Date: Feb 2009
Location: East bay area
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Posts: 250
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External wastegate on only 1/2 the cyl?
Due to packaging reasons, it would be extremely easy to run a gate on only the front 3 cyl of the manifold. I don't see this as an issue, but if there is one, I still can put it in the collector and gate both runners, it would be alot more work of course. Gate is. 44mm jgs and top turbine housing is a twin volute .85ar 65mm s300.
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02 2500 4x4, PDI 3 piece, 62/68/14, 7x.010 +.010, Quad Adr, super low stall DTT Super Single, built 47re.
Foreign Car Center
Vallejo, CA
Last edited by okish; 03-14-2020 at 11:52 AM.
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03-14-2020, 10:31 PM
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#2
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Name: roost
Title: Green Behind the Ears
Status: Not Here
Join Date: Jul 2014
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Posts: 36
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I believe hx35's only gate one volute, so in theory you should be fine.
I had a similar issue with a previous setup, ended up welding a external gate to a exhaust housing, keeping it divided up to the gate, worked very well.
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03-15-2020, 12:02 AM
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#3
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Name: okish
Title: Too Much Time
Status: Not Here
Join Date: Feb 2009
Location: East bay area
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Posts: 250
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Yea they were gated only on the rear volute and people commonly drill the divider to vent both. I'm worried that if I wastegate only the front cylinders, drive pressure will rise on the rear as the gate opens. I'll prolly just place the gate flange on the center of the manifold and have flow from both volutes. I don't want to put the gate on the housing in case I swap housings.
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02 2500 4x4, PDI 3 piece, 62/68/14, 7x.010 +.010, Quad Adr, super low stall DTT Super Single, built 47re.
Foreign Car Center
Vallejo, CA
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03-15-2020, 10:49 AM
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#4
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Name: Leiffi
Title: Too Much Time
Status: Not Here
Join Date: Jan 2013
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Posts: 1,381
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There is not much difference in backpressure between volutes when only other side is gated, they both share same turbine..
Yes, someone has actually measured it.
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03-15-2020, 12:04 PM
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#5
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Name: okish
Title: Too Much Time
Status: Not Here
Join Date: Feb 2009
Location: East bay area
Member`s Gallery
Posts: 250
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Quote:
Originally Posted by Leiffi
There is not much difference in backpressure between volutes when only other side is gated, they both share same turbine..
Yes, someone has actually measured it.
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Hmm. I know a little about thermodynamics and I know that at a given shaft hp for the compressor to keep up, pressure would increase on the non gated side since the turbine and compressor would start slowing. Of course there's like 500 more variables so I'm unsure if that actually happens in real life. If a few more can chime in about it and say it doesn't matter then I'll just vent the front cylinders to the hot pipe.
__________________
02 2500 4x4, PDI 3 piece, 62/68/14, 7x.010 +.010, Quad Adr, super low stall DTT Super Single, built 47re.
Foreign Car Center
Vallejo, CA
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03-15-2020, 12:35 PM
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#6
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Name: jasonc
Title: Too Much Time
Status: Not Here
Join Date: Nov 2009
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Posts: 4,396
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I'd do whatever possible to vent both banks the same.
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03-15-2020, 03:35 PM
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#7
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Name: roost
Title: Green Behind the Ears
Status: Not Here
Join Date: Jul 2014
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Posts: 36
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I think your control would be limited, depending on how much how much flow you are trying to gate.
The best control I experienced, is the above mentioned setup, you can see why.
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03-15-2020, 04:01 PM
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#8
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Name: jasonc
Title: Too Much Time
Status: Not Here
Join Date: Nov 2009
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Posts: 4,396
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Agree on the turbine housing. I've never tried it yet, but will the next set I do.
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03-16-2020, 02:38 PM
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#9
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Name: okish
Title: Too Much Time
Status: Not Here
Join Date: Feb 2009
Location: East bay area
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Posts: 250
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ill be putting it on the collector. if it doesn't work out. the turbine housing will be next. i figure if i swap housings/turbo's i wont have to redo the wastegate mounting. i see alot of the flanges have a divider all the way to the valve. any reason that no divider will harm anything?
__________________
02 2500 4x4, PDI 3 piece, 62/68/14, 7x.010 +.010, Quad Adr, super low stall DTT Super Single, built 47re.
Foreign Car Center
Vallejo, CA
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03-17-2020, 09:05 PM
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#10
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Name: roost
Title: Green Behind the Ears
Status: Not Here
Join Date: Jul 2014
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Posts: 36
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Maybe not a huge difference, certainly wouldn’t hurt though. I’ve played around with twin scroll vs undivided housings, mostly noticeable off idle.
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03-27-2020, 10:13 AM
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#11
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Name: okish
Title: Too Much Time
Status: Not Here
Join Date: Feb 2009
Location: East bay area
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Posts: 250
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This is what we came up with. I think it is the best solution, especially if I want to run different housings etc... I'll post a pic after it's all welded up
__________________
02 2500 4x4, PDI 3 piece, 62/68/14, 7x.010 +.010, Quad Adr, super low stall DTT Super Single, built 47re.
Foreign Car Center
Vallejo, CA
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03-27-2020, 01:34 PM
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#12
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Name: CorneliusRox
Title: Seasoned Rookie
Status: Not Here
Join Date: Dec 2012
Location: Detroit, MI
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Posts: 4,154
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Are you going to weld a plate up the middle to keep it divided? Or are you basically just going to turn your manifold into a non-divided manifold?
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Corey - BSME '21 Tesla Model 3 Perf
'22 DMax AT4 2500
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03-27-2020, 04:17 PM
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#13
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Name: okish
Title: Too Much Time
Status: Not Here
Join Date: Feb 2009
Location: East bay area
Member`s Gallery
Posts: 250
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Gonna Fab up a plate to run up the middle of the pipe and butt up against the bottom of the manifold. It won't be welded to the manifold because we ground out all the cast to be able to get enough flow. It will be formed to the floor but not water tight. I think it will be fine.
__________________
02 2500 4x4, PDI 3 piece, 62/68/14, 7x.010 +.010, Quad Adr, super low stall DTT Super Single, built 47re.
Foreign Car Center
Vallejo, CA
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03-27-2020, 06:19 PM
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#14
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Name: okish
Title: Too Much Time
Status: Not Here
Join Date: Feb 2009
Location: East bay area
Member`s Gallery
Posts: 250
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__________________
02 2500 4x4, PDI 3 piece, 62/68/14, 7x.010 +.010, Quad Adr, super low stall DTT Super Single, built 47re.
Foreign Car Center
Vallejo, CA
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03-27-2020, 06:26 PM
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#15
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Name: jasonc
Title: Too Much Time
Status: Not Here
Join Date: Nov 2009
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Posts: 4,396
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Turned out nice.
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03-27-2020, 06:43 PM
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#16
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Name: okish
Title: Too Much Time
Status: Not Here
Join Date: Feb 2009
Location: East bay area
Member`s Gallery
Posts: 250
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Thanks. Nice to never have to worry about a ****ty internal gate or what housing to run etc.
__________________
02 2500 4x4, PDI 3 piece, 62/68/14, 7x.010 +.010, Quad Adr, super low stall DTT Super Single, built 47re.
Foreign Car Center
Vallejo, CA
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03-27-2020, 06:46 PM
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#17
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Name: okish
Title: Too Much Time
Status: Not Here
Join Date: Feb 2009
Location: East bay area
Member`s Gallery
Posts: 250
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And mocked up. Can't get more slick than this.
__________________
02 2500 4x4, PDI 3 piece, 62/68/14, 7x.010 +.010, Quad Adr, super low stall DTT Super Single, built 47re.
Foreign Car Center
Vallejo, CA
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03-27-2020, 08:10 PM
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#18
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Name: thatguy69
Title: Too Much Time
Status: Not Here
Join Date: Jul 2011
Location: Mansfield Ohio
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Posts: 2,023
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looking good,i think ill do this on my next set
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1999 Compound 24v Rust Rocket
2008 F350 P24v/Allison
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03-27-2020, 11:18 PM
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#19
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Name: roost
Title: Green Behind the Ears
Status: Not Here
Join Date: Jul 2014
Member`s Gallery
Posts: 36
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Very nice, should work well for you. May be worth grabbing something like a knife sharpening block and go over the gate flange, looks like it could of warped.
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