rear down pipe block off?

[Mr_Efficiency]

Whats the best way to gp about blocking off the spot of the downpipe on the rear manifold?

Anyone have any sucess with welding a plate over it? or would i be better off to bolt the plate on?

[RedZMonte]

i think zzperformance uses a block off plate on their turbo kits.

S

[timg]

This hasn't been done much in the 60 degree world. The 3800 guys use their downpipe exit as a place to mount a wastegate on a block off plate. Welding would work. I would personally prefer a bolted on plate.

Tim

[Mr_Efficiency]

thats an interesting idea with the waste gate, except the fact that the other 3 cylinders are still passing the turbo on the way to the wastegate, but it would still work.

I think I'll just bolt a plate on and then weld it, that way I know i have a really good seal and if it cracks its not a huge deal cause the bolts will hold it on.

[Z26-T]

Depends on the car/turbo downpipe routing. Tried a bolt on cover on my beretta, but tore up my down pipe wrap trying to get it past the stupid bolts...took it all off and had it welded. But havn't put the turbo back on since so cant tell ya if it'll hold.

[3XTurboAgain]

i didnt think a stock rear manifold was mean to flow in that direction.

[Superdave]

welding cast iron sucks...

if you could find a TGP rear manifold or maybe use a 3.1's front manifold on the rear it might work out a little better.. I have seen people find the 1st design 3100 rear manifolds and weld over the downpipe.. (bottom one in this pic)



not pretty but it seems to work.

[Z26-T]

welding cast iron sucks...

That's why you pay someone else to do it :P

[3XTurboAgain]

how is the one on top better? the newer one has wider ports but doesnt seem like it would flow that well in that direction.

[IsaacHayes]

That image was borrowed from another site. It means it's better for N/A flow. The pic was posted just to show the lower manifold in the picture which would be the best style to block off, as the other log style exits in the center. Hack that style's exit flange off and weld a flat plate up.

[Mr_Efficiency]

I cant get a TGP rear manifold cause 1, im in canada so there scarce and 2, I'm using a 3400 top end so it wouldnt bolt up anyways. Also a front manifold wont work on the rear cause of the way the cylinders are stagered it would only bolt up with the opening pointing at the timing side of the engine.

I have the exhaust manifold in the top of the pic, and yes the one port goes the wrong way. What is the bottom one off of? is that a pre 2000 3100 exhaust manifold? It looks like it would work out a lot better.

[1meanz]

ill trade ya rear manis its from a early 3100, say 95 or 96 around there.

[Chris88CL]

I welded a plate on my rear manifold for my first ghetto turbo setup. It worked well and I had no issues. It wasnt an ideal setup by any means tho.

[pocket-rocket]

I had an old 80 Cutlass Calais that had a 307 that I put true duals on. The set of manifolds that got tracked down for me were made for a factory crossover and single exhaust, but the side for the in from the other bank had a plate welded to it like what Chris88CL mentioned.

[Z26-T]

I'm just going to use the "ghetto" welded block off until I can get some turbo headers made. *looks at FF then at loner666*