two turbos one engine

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two turbos one engine

Postby 93flatbed » Mon Aug 12, 2013 12:56 pm

I've been researching the subject. I came across a fair deal on a gta4294 so I picked it up. I have a 351 to go on the manifold. Should get going fairly quick...well I think it will. I've tried to understand all the math that gets spewed out over on Compd, but its way over my head. So, here comes the questions:
Any reason I shouldn't/can't run the 351 backwards on the manifold to make a super short hot pipe? (I want to run the 4294 up and forward, rather than under)

With work done to the 351 waste gate can I get away without a external gate, if not recommendations for a gate. If I do need an external gate do I clamp the internal one on the 351?

3" or 3.5" on the pipes?

And oil drain lines, some say a y fitting is ok, others say it won't work.

Sorry for all the questions, but I've read every thing I can find and each guy has a different idea, not sure why I feel it will be much different here, but at least you boys won't laugh me out of the forum for trying to get a ve to run decent.

Thanks in advance.
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Re: two turbos one engine

Postby RCCUMMINS89 » Mon Aug 12, 2013 1:18 pm

You can run your turbo backwards.

Personally with as much fuel as you're going to run, I'd run an external gate AND internal gate........both of course feeding back into the 42.

y-fitting.........I'll let the compound guys have their opinion on that. The right way is separate drains, but PERSONALLY I'm not convinced one actually needs it.
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Re: two turbos one engine

Postby Tacoclaw » Mon Aug 12, 2013 1:31 pm

I had good luck with my Y'd drains, I took two pieces of 1" water pipe and welded them into an actual Y shape. I wouldn't trust a T to drain nearly as well for whichever turbo came in perpendicular. Don't even try to use anything smaller than the factory drain hose.
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Re: two turbos one engine

Postby AHineman » Mon Aug 12, 2013 1:47 pm

Doesn't the 351 have a fixed outlet? May be a pain in the butt with it facing the firewall. I ran #12 push loc hose for drains. Works fine with one for each turbo. My primary was too low for it to drain with the line teed.
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Re: two turbos one engine

Postby 93flatbed » Mon Aug 12, 2013 5:29 pm

Yes fixed out let on the 351, by holding it in my hand under the hood it looks like I can make a nice long sweeping turn on the cold pipe.

Its better to have a short hot pipe vs a longer cold pipe correct?

When it comes to external gates, is there a thing as too big? I'm seeing 38mm-50mm. I'm not saying there won't be a small shot of nitrous, but at this point and time I do not really plan on it. All depends on the dyno numbers.

And RC, I need to call you about some products.
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Re: two turbos one engine

Postby RCCUMMINS89 » Mon Aug 12, 2013 5:39 pm

93flatbed wrote:Its better to have a short hot pipe vs a longer cold pipe correct?



IMO - yes, the shorter the hotpipe the better. Too long of a cold pipe can cause lag, but let's face it..... the air is already going like 10 feet, what's another foot.


93flatbed wrote:And RC, I need to call you about some products.


208-2one5-5six5nine call or text, I USUALLY am "working" anytime....but it's getting close to hunting season and daily I'm out of service. If I don't pick up, I will return your call shortly. Starting in Sept. within 12 hours
89 RC on shortened 92 diesel frame - NV4500 w/dual disc/4.10s on 37s. - Self built pump, "hot screw", lots of timing, True high volume low pressure lift pump, 62fmw/68/.7gated, 77lpm SAC Inj., Studs/O-rings,- 423/1220 Mustang - 11/16/2013 http://www.TheHungryDiesel.com full line dealer, if you don't see it please ask.
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Re: two turbos one engine

Postby Kasper Cummins » Mon Aug 12, 2013 5:50 pm

I might be wrong but I thought there was a locating pin that can be removed to turn the 351 cover.
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Re: two turbos one engine

Postby RCCUMMINS89 » Mon Aug 12, 2013 5:57 pm

There is
89 RC on shortened 92 diesel frame - NV4500 w/dual disc/4.10s on 37s. - Self built pump, "hot screw", lots of timing, True high volume low pressure lift pump, 62fmw/68/.7gated, 77lpm SAC Inj., Studs/O-rings,- 423/1220 Mustang - 11/16/2013 http://www.TheHungryDiesel.com full line dealer, if you don't see it please ask.
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Re: two turbos one engine

Postby AHineman » Mon Aug 12, 2013 5:59 pm

By fixed I meant 3rd gen style with no adjustable compressor elbow.
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Re: two turbos one engine

Postby RCCUMMINS89 » Mon Aug 12, 2013 6:22 pm

I know
89 RC on shortened 92 diesel frame - NV4500 w/dual disc/4.10s on 37s. - Self built pump, "hot screw", lots of timing, True high volume low pressure lift pump, 62fmw/68/.7gated, 77lpm SAC Inj., Studs/O-rings,- 423/1220 Mustang - 11/16/2013 http://www.TheHungryDiesel.com full line dealer, if you don't see it please ask.
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Re: two turbos one engine

Postby AHineman » Mon Aug 12, 2013 6:38 pm

RCCUMMINS89 wrote:I know


:lol:


Kasper Cummins wrote:I might be wrong but I thought there was a locating pin that can be removed to turn the 351 cover.


^^^^

I thought maybe kasper thought I meant you couldn't clock the turbo by me saying fixed outlet.



As for hot pipe/cold pipe length and diameter etc...

I recommend sch. 40 3" ID for the hotpipe. I think sch. 40 holds up way better than the exhaust pipe some people use. I'm sure the shorter the better on the hotpipe, but mine has 3 90*s and I can spool my 1.32 AR s475 just fine.

For the coldpipe I used 4" exhaust pipe and people said it would hinder spool up as well, but again I have no problems...




Moral of the story: Take everything you read on the internet with a grain of salt. Just because some one says it wont work doesn't mean it really wont.
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Re: two turbos one engine

Postby oldestof11 » Mon Aug 12, 2013 7:18 pm

That GTA a ball bearing turbo? If so, look up what size oil restrictor you need
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Re: two turbos one engine

Postby Tacoclaw » Mon Aug 12, 2013 7:20 pm

I thought they were only BB turbos if they had an X in their name.

If it does need a restrictor then T'ing your returns would be easy.
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Re: two turbos one engine

Postby 93flatbed » Mon Aug 12, 2013 7:25 pm

No sir, I have a ve, can't afford a BB windmill. I think I may send it off to t$ to get it punched to a 4202 though....time and money, all I need.

Any other guys have any input on gates and my other thoughts/questions?
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Re: two turbos one engine

Postby Tacoclaw » Mon Aug 12, 2013 7:31 pm

A 38mm will handle anything a VE will throw at it, hell, I think the stock internal 'gate will do that. How much spray are you talking? I still think a 38mm 'gate would handle any amount of exhaust/nitrous a VE could throw out.
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