Will it survive twins??? (kinda long) - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 11 (permalink) Old 05-01-2007, 12:11 PM Thread Starter
 
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Will it survive twins??? (kinda long)

OK, I'm ready for more power. I'm pretty sure I'm going to go with some DDP4's and either 191's or laser cut D/V's in the very near future.
That will probably keep me happy for a good long while, but I want twins. And not really for any good reason, just for the sounds they make and obviously for the performance gains (and just so that I can say I have twins).
I've been told though, that with stock internals and an o-ringed head, even below 60psi it won't survive long.
Now for perspective and to base your opinions on driving style, I drive like a grandma (an not a cool grandma) most of the time. On the street I'm not really in a huge hurry to get anywhere. I'll go about 5-10 over the speed limit at most and get to the posted speed at a reasonable rate, but other than at the track a few choice times a year my truck doesn't really see WOT too often. And when it does its only for a few seconds.
So the question is: Does anyone else have twins, making around 60psi avg with stock internals, and how long have you had them?
And should it survive with my driving style?

Sorry so long winded and thanks a whole lot in advance,
-R.J.
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post #2 of 11 (permalink) Old 05-01-2007, 04:13 PM
 
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You shouldnt have any problems. My buddy was running 60psi on a O-Ring'd head with stock bolts, and no problems with a single, which will probably have higher drive pressures. The stock internals will hold all kinds of boost if your head gasket will. Honestly I wouldnt mess with a good thing if you like how your turbo does, but its up to you

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post #3 of 11 (permalink) Old 05-01-2007, 05:15 PM Thread Starter
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Sounds good. I know a few people that run twins making 60psi or so with basically the same head work I have. And even some without a marine gasket. I like it the way it is and all, but since I have the money now to get a hold of a decent bottom turbo, and still do the injectors and D/V's I figured...why not. Especially if it won't cause any problems that will require tearing into the engine anytime real soon.
One of my probably many other questions is will the turbo I have now match up well with a HT3B? That was my plan for a primary if I didn't get too much negative feedback about running like this.
Please keep the knowledge and experience coming.
Thanks,
-R.J.
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post #4 of 11 (permalink) Old 05-02-2007, 01:04 AM
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I'd say you got a great top turbo to go with the '3B. You got the O-ring already, just start wrenchin!

Dale

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post #5 of 11 (permalink) Old 05-02-2007, 11:11 AM Thread Starter
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Y'all are boosting my confidence about this. Anyone have a mileage report with twins on stock internals?
I guess now all I have to do is find a turbo.
Is there a clear preference between the HT3B and the BHT3B?
Thanks again,
-R.J.
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post #6 of 11 (permalink) Old 05-02-2007, 02:25 PM
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either turbo will work fine, but there are a lot of different size 3b's. i run one with a 2.9 inducer on bottom and a hx40 on top. i run 58 psi with 3 pop off valves set at 50 psi. i just drove to nashville tn from dfw tx towing a tow dolly. i got 23.5 mpg at 75 or so mph. this is in my regular cab short bed with 3.55 and a auto. it still has the stock head gasket with the stock bolts on it. it has never been pulled off. i have 264k on it and dynoed 513 uncorrected last month. it suprised me it towed so well, we picked up a 98 quad cab short bed and i never had the egts go over 1000. i have decided to pull these twins off and put them on my dually because the worked so well towing.
i am going to build a big set for the little truck. and i will put on the ported head and double o ring the block to get ready for 100 plus pounds of boost.

97 3500 4x4 cummins 6 speed southbend dual disk, over 500rwhp. 2001 gmc sierra 2500 dura/alli 4x4 4 door,100hp dumaximizer. and project 11:30 98 12v reg cab, auto, short bed, hx40/16 on top, bht3be on bottom riding on a set of 20's and driving back and forth to work everyday at 500 plus rwhp. and a 00 4x4 crew cab stroke, heck it might get a cummins.
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post #7 of 11 (permalink) Old 05-02-2007, 02:26 PM
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and i almost forgot, i never roll off into it till it has warmed up. i am running 18 degrees of timing, ddp4s and a 180 pump.

97 3500 4x4 cummins 6 speed southbend dual disk, over 500rwhp. 2001 gmc sierra 2500 dura/alli 4x4 4 door,100hp dumaximizer. and project 11:30 98 12v reg cab, auto, short bed, hx40/16 on top, bht3be on bottom riding on a set of 20's and driving back and forth to work everyday at 500 plus rwhp. and a 00 4x4 crew cab stroke, heck it might get a cummins.
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post #8 of 11 (permalink) Old 05-02-2007, 03:17 PM Thread Starter
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Sounds like you're who I need to talk to.
Which 3B would seem to be a good candidate for my application? I'm not sure of all the compressor/turbine combinations available.
I'd like something similar to what you have. 60psi or so, somewhere around 550-600 at the ground until I can do some internals and fire ring the head.
Any recommendations on where to get a turbo? Dealer or junkyard? I'm assuming $400-$650 or so is fair for one of these.
I need all the help I can get.
Thanks,
-R.J.
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post #9 of 11 (permalink) Old 05-02-2007, 05:39 PM Thread Starter
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Left you a PM gunracer1.
Thanks,
-R.J.
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post #10 of 11 (permalink) Old 05-02-2007, 09:08 PM Thread Starter
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Just thought of something else.
Just to make life that much easier, does anyone sell just a piping kit. I know, for example Piers has a twins kit using an HX40 and a 3B, and my turbo is in basically the same position an HX40 would be in, if not the exact same position, and has the same downpipe and inlet size. Wouldn't the exhaust and intake piping work for my application since I'm using basically the same thing? Surely the piping kit supplied with their twins would match up to my application just fine.
What do y'all think?
-R.J.
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