HELP! Wanna Build Twin Turbo

calereeves · Post by **calereeves** » Thu Sep 13, 2001 9:19 pm

I think I might have found the perfect exhaust headers for a twin setup! They are in the JCWhitney VW catalog. They scavenge the gasses from alternating cylinders(1&3, 2&4), I think this could eliminate the problem of pulses.!? The one from JCW is meant for stock engines, so I think I might buy it, then take it to my local machinist friend and have him build me the same setup with 1 1/2 or 1 5/8 tubing. The great thing about these is that they never connect. I would have a cross pipe between the intake manifold pressure pipes. They both exit low, and at the same spot on both sides. Now all I need to do is find two suitable small turbos. Any ideas? If you know anyone who has two motorcycle turbos, or, someone mentioned earlier that some suzuki 1000cc engine came turboed, if you can get me in touch with someone who has one or two of these, I'd really appreciated it.

Thanks,
Cale

calereeves · Post by **calereeves** » Tue Sep 18, 2001 9:59 am

so, does anyone out there know anything about JC Whitney's quality? are they ok? their prices are really low, i dont know if that should be an indicator, or what...

Derrick from NC · Post by **Derrick from NC** » Tue Sep 18, 2001 3:31 pm

With a pr. of small turbo I would think that a 1-1/2" or 1-5/8" exhaust tubing would be way to large to get them to spool up quickly...a 1-3/8" maybe to large. Depending on the size of your motor going smaller than 1-3/8" could cause other problems"heat".

calereeves · Post by **calereeves** » Mon Sep 24, 2001 10:06 am

I hadnt really thought too much about the turbos not getting enough....thanks. back to the drawing board. here's my thoughts now, 2.0-2.4L T IV, all forged, slightly larger than stock valves with good porting, no overlap cam, longest exhaust duration to still have no overlap, custom header should be easier as the exhaust is easier to get to on the T IV. Two motorcycle turbos from Hayabusas or other 1000-1200cc motorcycle monsters. should have enough flow from the T4 with the right cam to turn this right?

Intercooling.... I was thinking, as I live in texas that this would be a must... now, if I had an "x-pipe" for an intercooler, wouldnt that serve two purposes, 1.) to balance any differences in flow pressure, and 2.) to have at least a small intercooler to cool the charge from what would probably be deadly heat to start with? Would two turbos heat the charge even more than one, or since they are both half the size, would it make any noticable difference in temp?
Thanks,
Cale

Afterthought: Also from the depths of my mind... what puts out more pressure, a good super charger, or engine exhaust? get my drift...?

Cale Reeves

JohnConnolly · Post by **JohnConnolly** » Mon Sep 24, 2001 12:41 pm

Most guys can't even do a single turbo properly, so why make things complicated (and more $$) by using two of them? One properly sized turbo will produce enough power to destroy your car FAST, and scare the hell out of anyone, so what's the point of duals? just use one PROPERLY and your car will fly.