Wouldnt putting a downpipe on the car throw off the "balance" of everything or will it help the car that much more? Also I'm wanting to keep it quiet as I can, dont mid having a nice purr but nothing to loud.

Canfield

 

No. You won't throw anything off "balance" with just a downpipe. It's actually considered a reliability modification, due to the reduction in engine bay heat after removal.

 

well it actually gives some gain in hp, while it reduces engine bay heat

its koo if u have just a cat back and downpipe, purrs at idle and then growls

dont get a midpipe since u are worried about the noise

mike

 

If you are going to do a downpipe and a higher flow muffler it would be advisable to get your engine tuned for the mods. The stock ECU might run a bit lean. Add a mid pipe and you're certainly in trouble in several ways unless you tune the car right and port your wastegate.

 

http://www.wvinter.net/~flanham/wlan.../3modrule.html

It's been proven, that it isn't the lean condition with a full exhaust that kills these cars.. it's maintaining safe boost levels.

Of course, all cars are different. So, it's IS better to be safe than sorry.

 

Thats an interesting document, according to that, as long as your fuel system is working in top shape, you can do quite a few mods to the car before requiring a retune/pfc. But only as long as you can control the boost pressure...

 

That is assuming that everything is working properly.

 

One thing i noticed (sorry to hijack your thread) but most of all the Japanese tuner's downpipes have a. . . .how would i explain this. . . . .a shape, sort of like a cobra's hood, while all of the US tuner's downpipe's are simply a "pipe" comparatively. Why is that? Is there any significant gain/advantage for either shape of downpipe? I've always wondered why this is. Someone please help out, or point me to the correct thread, thanks!!

Chris-

 

Right hand drive... Left hand drive...

 

Japanese cars have to squeeze the downpipe by the steering column because they are right hand drive. Thats why it is flattened. There is no gain in the odd shape.

 

Ahhh, ok. thanks guys

 

if anythin the us spec downpipes would be better with s smoother and consistant flow.

 

If one were on an unlimited budget, would a titanium downpipe be effective? It would be lighter, but would it be able to hold up to the heat the rotary produces?

-s-

 

to answer your other question, no the dp will not make it very much louder at all, at least that was my experience...you will be able to hear your turbos spool up though (not very loud either)

 

It's not the "lean condition...that kills these cars"? Isn't that what happens at higher boost levels?

 

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/titanium-cant-take-heat-265498/

 

Is it alright to get a downpipe and hollow out the factory main cat?? with a catback of course.

 

Read that article in the 1st page. It is said that *if* your fuel system is working correctly and you are running stock/near-stock boost, you should be fine. The thing is, with a straight exhaust, the boost will be difficult to keep at stock levels(~10psi).

 

Ok... Since it's obviously confusing to some:

A full exhaust at 10psi is NOT LEAN.

People seem to think that running a full exhaust -- or more than the dreaded "3 mod rule" -- is what determines the fate of the all-mighty RX7. It's false. It's running those mods at higher than stock boost levels... I apologise if that wasn't easily interpreted in my previous post.

 

There was a post a while back about titanium - basically, the rotary exhaust is too hot for it right out of the turbos.