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Going for twin GT35's. Hoping to use two stock passenger side manifolds...

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Going for twin GT35's. Hoping to use two stock passenger side manifolds...

 
Old 09-18-2017, 04:02 PM
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<drool> My god , that looks good! Kudos to you on a well executed build!
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Old 09-18-2017, 04:14 PM
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Thanks man. M2K Motorsports did the hard work of making the kit look good. I'm happy with the performance, just need to get it on a dyno and finish turning it up. Most I've pushed is 12.5psi on E85. Plan is to turn it to 17-18 on E85 and see how it likes it.
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Old 10-01-2017, 09:05 PM
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Sorry if i didnt catch it dave, 2 passenger truck manifolds or car? Also what brand gt35’s?
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Old 10-02-2017, 08:21 PM
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Truck manifolds.
Here's some pic's of the Schedule 40 pipe and the passenger side manifold. The opening on the manifold, the way I cut it, is kinda ovalized. But once I heat the end of the schedule 40 straight enough, I can shape it to match perfectly.









They are the On3 GT35's, T3 flanged, journal bearing, 61mm .68 A/R. Bought them a few years ago. They've been sitting, new in the box, since then. I think I paid a little over $6xx for the pair of them.
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Old 10-03-2017, 07:29 AM
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these might help in the build.
Amazon Amazon
. I'd like to do what you are doing, so research is the same.
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Old 10-04-2017, 07:46 AM
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Interesting. I had no idea those were out there. My pipe is 2.5" so I'd have to neck it down in some fashion. Thanks for the tip!
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Old 10-04-2017, 08:41 AM
  #27  
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I used some of those flanges for my twin set up. They are very nice and make things much easier.
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Old 10-04-2017, 06:25 PM
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Once again, thanks for the tips and contributions all you wonderful people supply.

Given the fantastic weather we had today (near Albany, NY) I decided to take the Z28 out to meet my wife for lunch. I'm reminding myself I'll have to do this as often as possible since the much hated snow and road salt will be surrounding all of us soon. The car is just shy of scary in its acceleration, having got to 19.5psi in a 2nd gear blast. That these engines can go from near stock docile behavior to banshee in the quick push of the gas pedal is nothing short of astonishing. I don't really need the twins but I do need something to work on this winter. I go stir crazy if I'm not under a car with wrenches.

Originally Posted by svslow View Post
I used some of those flanges for my twin set up. They are very nice and make things much easier.
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Old 10-04-2017, 06:51 PM
  #29  
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These work great, used one on a buddy's truck and it really makes things easy.
https://m.ebay.com/itm/T4-to-3-V-Ban...%257Ciid%253A2
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Old 10-05-2017, 11:27 AM
  #30  
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Thanks. I already had those and the T3 iterations bookmarked in my browser for future reference. While I like that design for both the aspects of versatility regarding clocking, removal, reattachment I'm leaning towards welding the T3 flange directly onto the end of the sched 40 pipe for strength, since my turbo's will be hanging off the end of the pipes. If my concept works out, it will be...

Trimmed truck Manifold > about 7.5" of sched 40 off the end of the manifold > 1/2" thick T3 flange > GT35.

I will be adding as strut/brace or two to help support the weight of the turbos.

Like I said, this is all conceptional. I'll have to see if it will work out as I envision.

Originally Posted by MY_2K_Z View Post
These work great, used one on a buddy's truck and it really makes things easy.
https://m.ebay.com/itm/T4-to-3-V-Ban...%257Ciid%253A2
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Old 11-15-2017, 01:18 PM
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I've got my car put in the shop for the winter and I'm making progress on converting to the twins.
  • 1. Removed Battery from stock location and moved it to the trunk. Running 1/0 welding cable from the hatch to a bulkhead fitting I installed in the shifter boot hole. The other side of the bulkhead connector goes to the starter. Running a heavy wire from the alternator to the battery positive. I'm running two 1/0 ground cables to the body. One in the hatch from the negative battery post, the other off passenger head to the fender. I've bought a plastic battery box with which to house the battery. Still weighing whether to mount the box in the middle cavity of the hatch area or to put it where the spare tire used to be.
  • 2. Took out the CXRacing hotside and the PT7675, plus most of the cold side.
  • 3. Bought some schedule 40 weld-Els and 2' of schedule 40 straight pipe.
  • 4. Bought and cut down a couple pairs of stock truck manifolds to get 2 passenger sides. Trimmed them too, taking off the 'bumps' for the heat shields, etc. Passenger side manifold is 'upside down' so the exit is on top. Drivers side has bottom exit.
  • 5. Been weighing the various placements for the twins. If I want aesthetics and symmetry, then I have to place them more towards the middle. Unless, I can find that elusive write up on how/where to relocate the stock fuse box. Alternately, If I don't care about aesthetics, I can put the passenger turbo over where the battery was and put the driver side somewhat in front of the power steering.
  • 6. Using the manifolds this way allows me to run a 4" downpipe, at least it looks like it. I'd create a merge of the 3" pipes leaving each turbo.
  • 7. I've opted to forego a complete schedule 40 hotside because of the weight(suspending two turbos off the end of a relativelyl long connector with schedule 40 would be substantial weight, even with bracing) and the 'scalability' since I want to be able to take off the GT35's and install my 'near twin' PT7675 and ON3 78mm T4 flanged turbos if I want to get scary. So, I bought some stainless 2.5" mandrel pipe/bends and 2.5" V-Band clamps. Hoping I can find a median position were each setup will fit with just a change of connector pipes from the manifolds to the turbos to the downpipe.
  • 8. 'devil in the details' stuff: Creating/getting a T fitting for oiling the turbos and a merge for the drains going into the existing passenger side -10AN port on the oil pan. While I have two turbosmart wastegates, I only have one Tial 50mm bov.
  • 9. Went ahead and bought a 'box o' fittings' 2.5" intercooler piping/couplers/T-bolt clamps.
  • 10. Don't know if I can (or want to ) leverage my existing 3" in/out front mount intercooler into the new setup. Probably too restrictive for the potential of this new setup.

Last edited by mightyquickz28; 11-15-2017 at 01:59 PM.
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Old 11-15-2017, 01:29 PM
  #32  
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Sch 40 is kinda excessive, Sch 10 works really well and is much nicer to work with.
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Old 01-18-2018, 02:38 PM
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Snow and freezing temps have made progress slow but with the aid of my new TIG welder, I'm making some progress. I've finished the passenger side, with the exception of the wastegate mount. Ordered the flange, just waiting.
But here's what my passenger side looks like so far.



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Old 01-18-2018, 09:08 PM
  #34  
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Originally Posted by mightyquickz28 View Post
Snow and freezing temps have made progress slow but with the aid of my new TIG welder, I'm making some progress. I've finished the passenger side, with the exception of the wastegate mount. Ordered the flange, just waiting.
But here's what my passenger side looks like so far.



Nice job DAVE!
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Old 01-18-2018, 10:22 PM
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Originally Posted by mightyquickz28 View Post
Snow and freezing temps have made progress slow but with the aid of my new TIG welder, I'm making some progress. I've finished the passenger side, with the exception of the wastegate mount. Ordered the flange, just waiting.
But here's what my passenger side looks like so far.



Looking good man, I've got a similar build going with vs billet gt35's, not much out there for results with these turbos
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Old 01-19-2018, 01:28 PM
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Thanks! Yes, I'm pinning my hopes that it will perform akin to another gents GTO on this site with twin Ebay Gt35's, trapping well into the 130s.

Mine are T3 Flanged 61/67 with .63 A/R, journal bearings.

Originally Posted by Cwarta View Post
Looking good man, I've got a similar build going with vs billet gt35's, not much out there for results with these turbos
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Old 01-19-2018, 01:29 PM
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Thanks Jon! How are you doing? Got any winter projects going on?
Originally Posted by RealQuick View Post
Nice job DAVE!
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Old 01-19-2018, 02:04 PM
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Originally Posted by mightyquickz28 View Post
Thanks! Yes, I'm pinning my hopes that it will perform akin to another gents GTO on this site with twin Ebay Gt35's, trapping well into the 130s.

Mine are T3 Flanged 61/67 with .63 A/R, journal bearings.
Yea red one? Just read his thread last night! Very promising

These are t3 .82 ar 61/63 billets. It's just on a sbe ls1 so I'd be stoked with 600whp, shouldn't have any problem there.

I subscribed, look forward to updates!
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Old 01-22-2018, 08:11 AM
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looks nice. very simple hotside routing. I'll be curious if the cold side gets simpler as well.

that's 2" sch 40? are they stainless and that's why TIG?
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Old 01-22-2018, 11:33 AM
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Thanks,
It's actually 2.5" schedule 40. I wanted the same manifold's to allow me to hang either my small twins or my 76mm (PT7675) and 78mm(ON3) if I feel like it, by only swapping the turbos and the short v-band connectors/adaptors.

They are mild steel schedule 40 pipe and Ells. I like the visual appeal of TIG and plus, it makes me look like I'm a better welder than I really am


Originally Posted by merim123 View Post
looks nice. very simple hotside routing. I'll be curious if the cold side gets simpler as well.

that's 2" sch 40? are they stainless and that's why TIG?
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