My Twin-Turbo SBC 240Z Build by PaulR

3 minute(s) of a 13 minute read

The 3D model is to scale. I found a CAD model on the web and checked it against dimensions that were in a GM book I have. Should be the same as the ones in the sticky at the top of this forum. You're welcome to a copy (ProE or a nuetral format like IGES or STEP). PM me and I'll send it to you. If a moderator wants to add it to the sticky, let me know.

I haven't run it hard enough to get real hot. but I do have stainless heat shields over the tubines. ( made from a sauce pan I bought at Value Village for 69 cents  ). So far, I can put my hand onthe hood and it is comfortably warm. I'll probably glue some insulation on the hood above the turbos before I get on it.

4-7-2009

Sorry for the lack of updates... I was out of town for 16 days, then I was helping my son work on his Datsun 510. Anyway enough of the excuses  

I got it on the road for the 1st time last week. A few nagging annoying problems, but nothing major so far. I have an oil leak that appears to be coming out of the back of the intake manifold. I'm guessing the seal between the manifold and the lifter valley (I did use a generous bead of RTV, not the stock gasket). Not sure if its boost related or not, but it wasn't leaking before the turbos went on. I tried disconnecting the PCV, thinking I was boosting into the crankcase thru it, but it only got worse! I also have an intermittent electric problem that I need to track down that kills the engine. I might be the supply for the MSD module, but it doesn't happen long enough to trouble shoot. Just a PITA when it decides to quit... especially in traffic 

OK, so impressions? I have to say WOW! The boost comes on pretty quick and you can definitely feel it. The 1st day I took it out, the roads were wet (this is near Seattle!) and no matter what speed I was going, the rear end would break loose when boost started kicking in, not a very friendly car to drive in the rain. We just had a couple of dry days, so I got to "feel" the acceleration pretty cool! Remember, I've got the wastegates set to only 5psi, so I not adding a ton of power, but its definitely working for me. 

I want to add some insulation to the hood above the turbos (gets pretty hot to the touch, but no paint discoloration) and fix some of the other minor issues, but so far I'm happy with the results.