Mark,<br><br>All kidding about the camera aside, that's a very clean set-up!<br><br>I thought I knew how people were hooking up their twins, but could never tell exactly from their pics. Yours have confirmed the configuration, showing good detail. <br><br>What boost figures do you expect? What engine mods do you plan on making to take advantage of (and be able to keep it together) such extreme air delivery? I'm just wondering at what level one wants to move from a tricked or bigger single turbo to the twins?<br><br>Thanks,<br>Vin<br>

 

A basically stock truck with injectors, box exhaust... and a properly torqued headgasket is good for 500-600hp on twins. the limit is about 80psi of boost before problems come.<br><br>Head porting, o-rings and a cam are very beneficial at this level but are not required.<br><br>you can use a stock aftercooler and piping. you just have to have your ducks in a row.. clean tubes, tight clamps.<br><br>the passenger side battery i really something that is in the way with twins.. a good single optima does the trick in most climates.<br><br>Later,<br>Mark

 

the level to go to twins is when a 40 can't keep down egts.<br><br>I don't recommend a bigger turbo for the street. Twins are way too user friendly compared to big singles.<br><br>quick spooling, huge top end, less smoke. Just all around better.<br><br>Stage 3 injectors and up will see huge drops in EGTs and more HP.

 

Cool, excellent summary of the parameters involved.<br>It would be a big advantage to be able to keep your foot into it without a constant egt worry.<br><br>Thanks again.

 

I've always wondered how twins were set up. Now I know. Thanks for the pics. Sweet setup. I'll let my truck be a guinea pig if you need one. ;D

 

[quote author=Mark_Kendrick link=board=7;threadid=12832;start=15#121442 date=1048865697]<br>A basically stock truck with injectors, box exhaust... and a properly torqued headgasket is good for 500-600hp on twins. the limit is about 80psi of boost before problems come.<br>[/quote]<br><br>80 psi with a stock head gasket?

 

What can an O-ringed head support? How much boost can you push before you have to drop compression? If you were to get the head ported, could you increase the cc's of the compression chamber enough to drop the compression enough to run say 90 psi or so? Could you run 90 psi and still be pretty streetable and reliable? I know you are going to trade off both of those for the more boost but my plan is to run around 80+psi of boost and still be daily driven.

 

Ther is a really pricey head gasket(~$900) avaialable that uses gas charged rings, when used with head studs it should be good to 100psi or so.

It requires no mods to the head to use it though.

The stock gasket is a stailess steel composite that'spretty tough. with enough clamping force the stock style gasket should get you to 80psi or so reliably. The stock bolts just won't provide the strength to do it though.

 

So you meant stock head gasket with studs?

 

No, at 80 psi on stock bolts you are at the failure point. 80 psi on studs is no big deal.<br><br>It's rare to find a truck that does not clear up the smoke at 60-65 psi.<br><br>12v can need more but 24v has a hard time getting fuel to need over 70psi.<br><br>You can make lots of boost. The real question is how much do you need.

 

The stock head gaskets I have heard of went at 60psi.

 

It's rare to find a truck that does not clear up the smoke at 60-65 psi.<br><br>Mine will cover a car up at 65, the stock gasket lasted quite a while with the Twins, now I have a .020 gasket(fiber) and studs, time to turn it up.<br><br>Jim<br><br>The new Twins look good Mark!<br>

 

Notice, a properly torqued head gasket will live to 80psi or so.<br><br>No all of the trucks from the factory have a 'true' deck surface and the heads are often in need of a surfacing(also out of true). their head gasket failures are not due to the gasket but the materials they are mating to. after they are given a little TLC then, properly torqued, they live quite well.<br><br>Usually you can take the head off have it surfaced, put it back on and all is good to around 600hp of occasional use. 4-500hp daily is no big deal. <br><br>Above the 600hp level you are getting past the limitations of the botls and other components.<br><br>Later,<br>Mark<br><br>

 

So do I absolutely need to surface the block and head, then put it all back together properly torqued? BTW, when are you going to get around to finishing that on the block in your shop?<br>

 

[quote author=JRodgers link=board=7;threadid=12832;start=15#122767 date=1049154741]<br>So do I absolutely need to surface the block and head, then put it all back together properly torqued? BTW, when are you going to get around to finishing that on the block in your shop?<br><br>[/quote]<br>you just need to get a job....JOE :P :P :P