All right, I don't want to sound dumb, but I have a question for my turbo project. I have a gale-banks style loglike turbo manifold I am going to use on my passenger side head. It is fully ported, but still pretty restrictive looking. I already have SLP headers and and SLP y pipe on my car. Now, this is going to be a draw through (i think that's what it's called) setup, where the exhaust from one side goes into the turbo manifold and then into the turbo. Now, my question is: If I leave my driver side SLP header on there, will there be so much of a lack of backpressure on that side, that the heads will be doing different loads of work?

Here's my turbo manifold.

I haven't had enough physics yet to give a really good answer, but I think it would be okay. Even if the gases can get out of the drivers side header quicker, they still have to go through to the passenger side. If the turbo header isn't flowing as well as the slp header is then the gases will get backed up (I guess) in the turbo header. I don' t really think it'll be a problem, TR guys sometimes stick an ATR header on just the drivers side and leave the passenger side stock. Then again, stock TR headers are good for tens....:hail:

Thanks, man... any other input?
That's definitely a valid point about the TR folk.... just looking for more second opinions, i suppose

Better safe than sorry...

Jon

I don't see it as being a head flow issues as much as it is a piston/crank problem. The passenger side bank will be working much harder to expell the exhaust gasses than the drivers side. This added effort will put more strain on that side of the engine. You can just run the car without a crossover pipe, but you will not build boost as fast and it will be less reliable.

Wouldn't taking off the crossover pipe just make things worse? The passenger side wouldn't breathe any better plus the turbo's not going to spool as quick. I would think having a one bank system would put even more pressure on the side with the turbo than a system with one slp header and one turbo manifold. Just my opinion though...

Greasmonkey:

We are pretty much saying the same thing. I totally agree that not having the crossover pipe is a bad idea.

Whoops. Misunderstood what you were saying. I completely agree with you.

Ok, so having uneven flow will be create un an even stress on that half of the engine? So, what should I do? Should i put a tubular exhaust manifold back on the driver's side? Should i just run a single turbo with low boost, and wait till my engine blows? Or should I just use the other turbo manifold I have lying around the house and make twin turbos? (I know that sounds like the obvious, but that'll be much costlier/more complicated IMO)

Thanks for everyone's help

Jon

Assuming that the crossover pipe is an adequate size (probably anything over 2.25" is OK with most turbo manifolds that I've seen), and the header/manifold on the non turbo size is less restrictive then the one on the turbo side you’ll see the same pressure at all the ports because the biggest restriction will be the turbine housing, so it won’t make a difference what you use on the non turbo side.

For best performance I’d try to keep the overall volume as low as possible to keep exhaust velocity as high as possible

Thanks, 83 crossfire, that's exactly what i wanted to know!


Jon

Ok, now that i see that the manifolds have provisions for the crossover pipe i see what you are saying now. I thought you weren't using one... the SLP header will suite you just fine.