would you want the long runner length that the ram horns and topmounts provide? or maybe a shorty or possibly even cast? what would give the best power characteristics for a non-drag set up?

450-500hp 2.1L b series in a dc2r

 

For your power goals I would rule out a cast manifold, you can make that power with one, but with a ramhorn power would be made easier...Depending on how much money you want to spend top mounts are always nice but for those goals I say ram horn all the way

 

i should have added that AC will stay. i hate to sound like a picky bitch trying to build an impossible car, but i dont think a 475hp dc2 with AC that has a decent power band is too much to ask for.

im taking a strong look at the afi kit. im usually against "kits" but, i cant point out anything included that i would be opposed to using other than the actual turbo itself, which im sure they would work something out with.

 

synapse sells a ram horn thats a/c compatible

 

Cast log manifolds are fine, especially for road race. You're not needing to make the power that you think you need on a circuit course. for a bit more midrange, an equal length shorty is all one needs. No ramhorns, no topmounts..

Done.

 

its goign to get real tricky when i get a manifold that clears ac with one turbo, but doesnt clear with another... car wont be daily obviously but im not trying to have my ***** sticking to my leg at my final destination.

 

If you're circuit racing, A/C is secondary. If you're trying to use a log manifold w/ a big housing turbo for road racing, you won't be doing that well...

 

Circuit Racing and you want 475 WHP?? Thats more like a drag car.. There is no need to make that kind of power circuit racing.

 

i know what your all saying the the top fuel civic in its final iteration made ~480hp and was an awesome circuit car, ive seen videos of it spanking GTR's and RX-7's. With good suspension and sticky icky tires i think it would be VERY fun on a big track.

 

it really depends on the track you are on. if you have a higher speed track that you can use 4th and 5th, then the power really helps with keeping up with the vipers and ford gt's. just make sure you use some kind of boost by gear management.

 

i would imagine that would be paramount

 

Boost by gear may not be that prudent if you're changing tracks. the amount power power needed in one gear on one track may be the opposite on another, in which you need to be able to test out the conditions with something easily adjustable, like a simple EBC. On a 2800lbs FWD car, 475whp is almost useless regardless of track. If your driving skill is good enough, you'll easily keep up w/ these other hp monsters in different areas of the course where their characteristics may put them at a disadvantage. Even on the larger tracks, no more than 350whp is really ever needed on a Honda. Even then, use that power w/ care.

 

wouldn't a ram horn be best for circuit?

 

No. Look at the difference b/w exhaust VOLUME, and exhaust VELOCITY. There's a manifold FAQ in the sticky. The manifold/exhaust energy needs be like a midget hooker, (Short, hot, and fast). Throttle response is more key than anything in circuit racing, not "flow" as people like to put it. You want the exhaust energy to do as little traveling through the system to the turbine as possible.

Complementary example: The Puma Evolution VIII still is one of the fastest cars in its class in Japan using stock turbine, and stock exhaust manifold to get maximum velocity.

 

ramhorn it is. and i think 450ish can "hook" in a RR situation with 16x8 rims with 235mm R compound tires and fender flares to compliment the mess, but thats another thread in another forum. thanks for the suggestions.

 

did you take advice from anybody in this thread ? try this one i guess and good luck
https://honda-tech.com/forums/road-racing-autocross-time-attack-19/post-up-boosted-road-race-setups-2476862/