can a 3'' downpipe work on a maxima or will it hang to low?

 

That is what the majority of Max owners are using. You can crush the piping a little to make it oval shaped and it will flow about the same amount of air. Oval piping is what StockCar and other racing sports use......

 

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You can also buy an oval pipe section with the transitions. Really though, there is very little difference between a 2.5" and 3" DP when it comes to ground clearance.

I'm building mine w/ a 2.5" downpipe. Only because of the hybrid turbo. I've seen 2.5" downpipes support 500+ whp, so I'm not thinking it will be too much restriction. I may go to a 3" downpipe down the line.

 

will a 3'' downpipe make a t4 turbo spool faster or is it about the same as a 2.5''and is there any more good things about going with a 3''downpipe?

 

what about a bigger up pipe will that help or hurt power

 

the difference between 2.5 inch pipe and 3 inch pipe is 50% more area.

 

will a 3" make a t4 turbo spool faster than 2.5" downpipe

 

Most T4 turbos have 3" exhaust flanges which means you have to run a 3" downpipe unless you want to deal with reducers and such.

Most T3 turbos have a 2.5" exhaust flange which needs a 2.5" downpipe.

And no, a bigger downpipe isn't going to make a T4 spool noticably faster. All the guys running T4's on this forum already have 3" downpipes and they're all hitting full boost 3800 RPM and up even with BB turbos. A bigger downpipe will generate more power and keep the turbo spooled up better than a too small downpipe will. Spooling a turbo has more to do with the feed, and the actual sizing depending on application.

 

I have a 3 inch downpipe and crushed under the tranny like Eric just described. My observation from racing Eric many times. With 3 inch piping the car has way more power then 2.5 exhaust. I dont know what it is, but Eric puts about 7 car lengths on me. Must be a good idea to have 3 inch exhaust all the way back. I am happy with my 2.5 exhaust setup since is very quiet for me. 3inch as long as you crush it down a bit will give you some good ground clearance.

 

thanks for the help (Jay and shadow) but one last thing how can imake a t4 turbo to spool faster than 3800rpms. Will a max with a t4 be faster than a max with t3/t4 turbo?

 

I dont know a way to spool up a t4/t4 faster then 3800RPMS. All I can tell you is that I went t4/t04e BB turbo for a faster spool up from 38-6600RPMs. I dont want my turbo to be fully spooled before then. Its stup!d and senseless to have full boost before 38K! You risk the chance of cracking the tranny case/breaking the tranny or breaking an axle from loss of traction because boost is hitting so soon. Hope you understand. I play alot on the streets/freeway and the track. This t4/t4 setup is excellent for all three purposes. I would not go with any other set up, pretty senseless to me. A max with a T4/T4 setup with a MEVI would be way faster then a t3/t4 maxima with out a MEVI. I am throwing the MEVI because the american manifold is useless past 55K RPMS, so you can shift @ 66K and still pulling. Remember though there are quite a few sizes of turbos out there so its not a simple question to answer.

 

Thanks for the help jay now i under stand.Boost will break stuff if you spool to fast and that is bad in my book. THANKS FOR HELPING ME OUT!!!!!!!!

 

I'm personally a big believer in hybrid turbos simply because they spool faster. Wider powerband is good, turbo lag isn't. Especially if you drive an auto which I think from previous posts, you do. A T4 turbo is going to break stuff in your car just as fast as a hybrid T3/T4. Spooling too fast isn't going to break anything. I'd rather have the powerband down low and be able to modulate the power via the throttle than to have to wait for a turbo to hit full boost.

I don't like MEVI's for that same reason, you lose power down low for the power at the top. We spend all this time knocking Hondas for lack of low end torque and then we go and do the exact same thing to our cars. A lot of people think the trade off is worth it though. That's your call.

I guess sometime in the future when I finally get my car done, I'll have to meet up with Jay at the track sometime and see if indeed a full T4 w/ MEVI is way faster than a T3/T4 without.

 

Jeff when I had my supercharger and ran against Erick. He had a broken VI. He pulled on me a great deal. With a turbo you dont notice much torque loss. When you get your set up, up and running we all can go to the track. For now I am in no rush to go. We can have all 5-6 atlanta turbo maximas and they should all be up and running we can all compare the numbers etc..

 

That is why I wanted a t3/t4 instead of a t4 but most people that have a max have (t4) and like you said LAG IS BAD and a BIG powerband is good.Thanks shadow.When I get my max done we need together and play at the track and lets all see if a t3/t4 max can beat a t4 max.

 

Can you put a 3'' downpipe on a t3/t4 turbo or do you have to use a 2.5''.

 

That question was already answered in post #9...

 

 

How do a auto downpipe and a 5-speed tranny downpipe differ. The reason is I might turbo my max now and it is a auto and then if I do not like the turbo auto I will change to a 5-speed. Can I keep the same downpipe or do I have to change them out ?

 

I think there is a an extra motor mount for the auto that is in the way but I am not sure. I asked people where the extra mount was but nobody answered me. I am also auto and I would like to know.

 

Help us maxima GODS

 

Your downpipe will hang lower then a 5 speed down pipe. It sucks because you have to watch where you drive. I dont have that problem with my down pipe since I am a 5 speed.

 

So that means that I need to throw out the auto for a 5 speed and then turbo or should I turbo now??????????