Revhard manifold/downpipe?

[elpiar]

I planning to use revhard manifold for my setup. Few questions:

1. Is it true that log manifold like this have better spool than tubular manifold?2. Will this clear A/C (top mount or bottom mount?)?3. I want to reroute my dump tube to the downpipe. In this case will revhard manifold allow me to do this?

I'm trying to avoid custom downpipe as much as possible because (1) I don't know any good custom exhaust shop that won't rip me off and give crappy results and (2) don't have time to do it myself.

4. Do most of you custom fabricate your downpipe? What are my alternatives?

[WDRacing]

Well, the REvHard and FMax are basically the same IIRC, both are top mount cast type log manifolds. There is no increase in spool by using a log type manifold. A good tubular manifold will spool well and also make more power because of the exhaust flow.

Any wastegate dump can be routed back to the downpipe. Unless you find someone selling a downpipe that had previously used this manifold, then you'll need a custom DP fabbed.

Unless we buy kits, most of us have things fabricated or fab them ourselves. Any exhaust shop can do the work for you if you give them the flange for the back of the turbo. Doesn't have to be a performance shop at all. Even Midas will do it, everyone loves money equally.

WD

[elpiar]

Thanks!

For the dump tube recirculate, the reason I asked is that I'm wondering whether the revhard manifold wastegate location/position will allow me enough space to do this or not.

I'll start asking around for the downpipe fabrication. How much price range do you think I should expect to pay?

[WDRacing]

The mani should definitly allow for recirculation. The Downpipe fab should be from $50-$150 on the low to high scale.

WD

[elpiar]

Thanks.Another thought: Obviously the exhaust shop would need the car to custom fab the DP, but how do I drive it there? Driving it without a downpipe, even as mild as I can be would deifinitely melt things in my engine bay, right? I guess I need to tow it?

[WDRacing]

Yep, tow is the best option...sucks I know. I know people who have made partial downpipes to get where they are going...but you have to be able to weld and at that point, might as well finish the project yourself.

[Craving4Boost]

make sure you buy an on-center turbo or else you'll be running into more downpipe issues. Without an on-center turbo you're going to have to really customize the downpipe to fit or else it easily hit the brake master cylinder. With an on-center turbo, there is so much room there's none like it.

[elpiar]

I tried to search for information on on-center turbo, but to no avail.

Do you have pics of an on-center turbo? are most t3/t04e on-center or off-center?

So what manifold should I use so I don't have to find on-center turbos? I read in garrett's website that on-center turbine housings add lags and old in technology.

[NateDogg]

I talked to Don Nimi from PDM-Racing.com about his KA-T. He currently uses a Revhard but he was complaining about the casting disintegrating and having to patch it up in certain areas.

IMO there are better manifolds available (fitment, quality, flow) and if you dont have a lot of time I would recommend you get a kit from one of our sponsors. I wasted a week hunting down parts running back and forth to the local auto parts store getting little parts.

IAP and AMS come to mind..

I have an ETDRacing.com manifold on my S13 w/abs and Z32 BMC and it is great.

[WDRacing]

Why not just get the JGS mani/turbo/downpipe/wastegate combo? All your problems go away.

WD

[elpiar]

Does the ETDracing manifold clear BMC for tangential t3 housing? (so I don't have to find on-center turbine housing)

[elpiar]

Why not just get the JGS mani/turbo/downpipe/wastegate combo? All your problems go away.

WD

It's on my list of options but it seems that the manifold design is so inefficient with all the right angle turns the exhaust flow go through.

[WDRacing]

Its just as good as Fmax or RevHard. When you're using a log, you don't really need to worry about flow. Thye are all going to be worse then a tubular. I used a JGS and it worked well for me. I know several guys who have run a JGS and had excellent results.

WD

[elpiar]

If I'm aiming for 350-400 whp, do you think the JGS will suit my needs? or should I buy better (more expensive therefore) manifolds?

[NateDogg]

I would recommend a tubular-style manifold for over 10psi (300whp+). You will get higher hp for less boost. Also less intake contamination due to lower backpressure which will decrease chances of detonation.

The ETD has some of the best clearance at its price point. Yes it will clear almost anything.

I chose it for good flow (fiznat made 430whp at 20psi on meth injection), clearance to brake master, weld-el design (not cast) and proper wastegate placement.

http://www.etdracing.com/ka24.html

[WDRacing]

We have members who have made over 400 with the JGS...the price difference between the two does not make the ETD a better choice IMO.

It still leaves the task of DP and turbo selection...

This is a smoking deal...

http://www.jgstools.com/turbo/index2.html

[C-Kwik]

Well, the REvHard and FMax are basically the same IIRC, both are top mount cast type log manifolds. There is no increase in spool by using a log type manifold. A good tubular manifold will spool well and also make more power because of the exhaust flow.

The Revhard and Fmax manis are very different. The Revhard actually has separate runners for each port. They are pretty much straight short runners, but do not have to share a path to the collector area. The Fmax is a true log style.

[C-Kwik]

The Fmax mani is also a sidemount.