Guest Anonymous Posted November 6, 2000 Share Posted November 6, 2000 There is a crossover pipe on the rear of a vg30t engine, right above the bellhousing. If the turbo is relocated to the front of the engine the whole drivetrain can be slid rearwards another 6 inches or thereabouts since the crossover pipe is gone. So, spend lots of money on a fancy exhaust system to move the engine back another 6 inches, or put an extra u-joint in the steering to make room for stock manifolds. The vg is 390 pounds, compared to over 450 for a complete non turbo l28 engine. Even with the v6 in the forward most position(stock manifolding) it's CG will still be farther rearwards than that of the l6 engine. So, move exhaust and slide engine waaay back, or don't and use stock exhaust manifolds and add a u-joint to the steering. I really want to move it back, but I have neither the skill nor the resources to make the exhaust manifolding required myself, and such a complicated maze of stainless pipe will be VERY expensive to have made. Opinions? Anyone with a tig welder who wants to make some manifolds for me for free? ------------------ Morgan http://z31.com/~morgan/s30 http://carfiche.com [This message has been edited by Morgan (edited November 05, 2000).] Quote Link to comment Share on other sites More sharing options...
pparaska Posted November 6, 2000 Share Posted November 6, 2000 Man, that'd be a tough one for me. I'd be really prone to wanting that engine back all the way too. Something cleaner about that install - no crossover at the firewall, no u-joint in the steering, the CG. would be farther back, etc. But practicality might win me over - add a u-joint and just bolt the engine in with the OE manifolds and crossover. I'm no help, I know. Sorry ------------------ Pete Paraska - 73 540Z - Marathon Z Project - pparaska@home.com">pparaska@home.com - Quote Link to comment Share on other sites More sharing options...
Scottie-GNZ Posted November 6, 2000 Share Posted November 6, 2000 If you run a single turbo and retain stock type exhaust manifolds, you still need a crossover pipe of sone type in order to have the exhaust from both banks drive the turbine. Scottie Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted November 6, 2000 Share Posted November 6, 2000 v6 is lighter and v6 CG is farther back than stock in either location, so it's just "best" or "second best" choice. With the turbo in front, both banks would come forward like in your gn engine scott, real easy, just bolt on some pathfinder manifolds(backwards so they point forwards and down instead of back and down) and make the rest of the exhaust. Only problem is I can't do it myself ------------------ Morgan http://z31.com/~morgan/s30 http://carfiche.com Quote Link to comment Share on other sites More sharing options...
Guest Jason Posted November 6, 2000 Share Posted November 6, 2000 Not sure it would help, but it's possible to mig weld stainless with the right gas and wire. Quote Link to comment Share on other sites More sharing options...
Scottie-GNZ Posted November 6, 2000 Share Posted November 6, 2000 Morgan, point of clarification. The GN driver's dise header flows towards the rear with a crossover pipe that goes under the rear of the engine and up into the rear of the pass side header. That header flows forward and dump UP with the turbo sitting on top of it with the proper support of course. Seems like you are going to a lot of trouble to avoid a u-joint in the steering rod and that is common practice on street rods. MOF, ever look under the hood of real Cobra? Even with the crossover pipe on top, the engine setback will still provide a beter F/R weight distribution over a stock Z with the L6. ------------------ Scottie 71 240GN-Z http://www.mindspring.com/~vscott911/gnz.html Quote Link to comment Share on other sites More sharing options...
jeromio Posted November 6, 2000 Share Posted November 6, 2000 I would do the custom tubes. It's true, you can weld stainless with stainless wire and the right gas. BUT, I would just do standard steel and then have it ceramic coated. You can get lots of J or U bends from many different suppliers. Use a tubing cutter. It'll be fun. You're not really having to deal with that many bends (unlike say, making custom headers), and there'll be lots of room in the front there. Plus, as to the weight distro issues, have you factored in the intercooler and plumbing? Plus, with the turbo up front, it'll be easier to get at - and it'll look really cool too. And actually, if you have no welder, You could mock up the tube pieces (duct tape them maybe) and then carry them to the welder's shop when you've worked it all out. That would reduce the cost considerably and you'd end up with nice professional welds (that won't leak). I've never heard of a welder charging more than $50 an hour - prob'ly cost you no more than $150. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted November 6, 2000 Share Posted November 6, 2000 jet-hot won't coat the insides of turbo manifolds because they say even their jet-hot 2000 stuff can start to slag off when the metal is glowing. Intercooler and plumbing is insignificant, 20 pounds maybe at most. Either way, the car will be rear-heavy by a pretty good amount. ------------------ Morgan http://z31.com/~morgan/s30 http://carfiche.com Quote Link to comment Share on other sites More sharing options...
randy 77zt Posted November 7, 2000 Share Posted November 7, 2000 morgan-put some truck manifolds or 200sx manifolds on backwards and put the engine in the car and go for it.or leave some 3" long pieces of pipe on the manifolds and find a good muffler shop that does custom work.the shop that did the 3" mandrel bend system on my car does lots of hot rod fab work. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted November 7, 2000 Share Posted November 7, 2000 Yeah, life is one giant compromise though. I'll probably just skip the fancy exhaust just to get the stupid thing running faster. It's still gonna be very rear heavy and lighter than stock, so it's not that big of a deal I guess. ------------------ Morgan http://z31.com/~morgan/s30 http://carfiche.com Quote Link to comment Share on other sites More sharing options...
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