|
Post by Aurora40 on Sept 2, 2005 10:22:49 GMT -6
I noticed while under the car one day, that there's like a plate over the crossover exhaust pipe. It attaches to the tranny and motor and covers the crossover. I think if I remove the plate, the crossover can be unbolted. I suspect this is one of the largest restrictions in the exhaust because of how it smooshes to fit between the motor and tranny. It sort of flattens out.
The closer to the motor you go, the hotter, and thus faster, the exhaust is. So this is where you can really improve flow. Of course a cat-back can help, but up by the motor helps most. I'm thinking about removing this pipe and taking a look in it. Maybe there are edges that can be ground down, or something like that. Who knows.
Anyone else do this or curious about it?
Dan, I think on the 3.5L this is even easier. The crossover from the front exhaust manifold to the rear runs on top of the motor, right under the air intake ducting and such. However, that means yours might not be as restrictive in the first place.
|
|
|
Post by Custom88 on Sept 2, 2005 10:49:53 GMT -6
I don't think anything can be done on the 3.5 just because the throttle body is less than an inch above the exhaust manifold crossover pipe. The pipe is already flattened out just to fit in this tiny area as well. It practically sits on top of the transmission too. This is probably part of the reason I have really great performance with a cold engine but as it heats up it gets significantly slower. They make a product called header wrap that you can wrap around the headers to keep the heat from dissapating from the exhaust pipe but you'd have to remove the pipes in order to wrap them. on my engine I think it might be beneficial to wrap the TB in some heat resistant wrapping too, and even the entire airbox as it gets HOT after only a few minutes of driving. The crossover pipe is also only about 3" away from the airbox too. the enginebay is kind of cramped..
|
|
|
Post by Aurora40 on Sept 2, 2005 13:33:37 GMT -6
You mean you think you can't remove it? Or you think it can't be improved. If it's all pretty inside, it probably can't be improved. But I kind of bet it will have a less-than-smooth interior. There might be some edges or lips that can be ground down. I dunno... I haven't actually looked inside mine yet.
|
|
|
Post by stevensolds on Sept 2, 2005 21:47:50 GMT -6
I thought of doing something like that. Dan, my engine seems very fast on cold starts too. Then again, i think all engines do. I never ripped into it when cold before, ALWAYS let it warm for a minute or two and drive gently til coolant temp is 200. The other day i FLOORED it from a stop, and it lit up the tires on a nice smooth street, where i would usually only get a few chirps if it is hot. It went to like 3500rpm without any water.
|
|
|
Post by Custom88 on Sept 2, 2005 23:56:01 GMT -6
You mean you think you can't remove it? Or you think it can't be improved. If it's all pretty inside, it probably can't be improved. But I kind of bet it will have a less-than-smooth interior. There might be some edges or lips that can be ground down. I dunno... I haven't actually looked inside mine yet. sorry, I meant that I don't think it could be improved size-wise. (bigger crossover pipe.) As for the inside of the pipe you're probably right about that.. I just have no idea where you'd get something like that smoothed out? It'd probably make a nice difference though.
|
|
|
Post by oldsauroraman1 on Sept 3, 2005 10:55:14 GMT -6
I noticed that pipe the other day. It does have some odd shapes to it, but I think thats to keep the volume of pipe consistent. Should be able to make it larger though.
|
|