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1G Looking for a different exhaust manifold...

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RipperXX

20+ Year Contributor
5,790
165
Feb 23, 2003
Royston, Georgia
Is there any bolt on manifold that's a quality cast piece that still offers WG off the manifold? I'm sick and tired of my external WG on O2 housing setup. Is there anything still out there like the ERL manifold?
 
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I don't believe they're is anything currently on the market cast like the erl They're is however a tubular obx that resembles the old erl I read debating on trying out when I go t3 but it's listed for the 3g 2.4 eclipse but definitely looks like it will for on our 4g63. It's more offset to the left then the right like most of the latter 4g motors. Unsure of the quality but I did have an older tubular obx stock flange manifold that held up my hx40 with no issues or signs of cracking so I think they are of decent quality and not to pricey.
 

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I used a 2g manifold with an F 38 flange welded onto if for years with no issues. "Rev9" makes a good T3 manifold for 115 bucks shipped.
 
Well, I'm still using a MHI Evo III turbo so I'm looking for something that has a flange for 7cm2 housings. The only thing I can find is a $900 JM Fab tubular manifold. I might look into aquiring a 2g manifold and trying to weld on a piece for my MVS WG.
 
I don't believe they're is anything currently on the market cast like the erl They're is however a tubular obx that resembles the old erl I read debating on trying out when I go t3 but it's listed for the 3g 2.4 eclipse but definitely looks like it will for on our 4g63. It's more offset to the left then the right like most of the latter 4g motors. Unsure of the quality but I did have an older tubular obx stock flange manifold that held up my hx40 with no issues or signs of cracking so I think they are of decent quality and not to pricey.

That's a copy of the old south Florida performance manifold.
Try and find an old hafe manifold. I've been using the sbr 2nd copy for years without issue.
 
Just out of curiosity, why are you unhappy with the w/g off the o2 housing?

Because the dump tube is in the way. I either have to fabricate something ridicules so that I can remove the oil filter without removing the dump pipe, or remove the dump pipe every time I change the oil filter. Which is stupid and annoying.
 
Not sure what brand o2 housing you have, but I have the JM Fab unit and I decided I wasn’t happy with the 90* dump tube and all the room it required.
I contacted Jim and he fabricated me a custom length straight piece.
Haven’t got around to working on the car, but the plan is to clock the wastegate using the straight dump in order to retain the factory dual fan setup. :)
There are options out there for getting yourself a custom-fabbed dump tube in order to satisfy the needs of your setup, if that helps?
 
Because the dump tube is in the way. I either have to fabricate something ridicules so that I can remove the oil filter without removing the dump pipe, or remove the dump pipe every time I change the oil filter. Which is stupid and annoying.

I will have to agree, with mine it's also a bit of a tight squeeze.
 
When u run a wastegate off the o2 housing your wastegate flap is either removed or welded open, in order to run a wastegate off the manifold it would need to be welded shut. Would be easier to get a dump tube that does not get in your way then set it up to run off the manifold just fyi.
 
I’ve always wondered how the HAFE manifolds pan out. Ever since I saw them I’ve liked it for simplicity.
I just questioned if it functioned fine or not due to venting #4 runner only vs at the collector.
 
HAFE manifold were/are still awesome. They were SS cast, with a thick exhaustflange. I ran one on my 14b 1g for years. it was to replace my stock 1g that cracked in several places. I would still run it if I didnt have a port FP and evo3 manifold.

The runners are wider and have a much nicer design than the stock and the evo3/2g. I cant say anythign about running an external, my HAFE did not have runner 4 drilled, the provision was there but no hole.
 
Wastegate off the o2 is the worst way to go, worse than just welding a flange on runner #1.

It works no better than an internal gate with an upgraded actuator.
 
Wastegate off the o2 is the worst way to go, worse than just welding a flange on runner #1.

It works no better than an internal gate with an upgraded actuator.

Would you explain this better. I was under the impression that using the O2 port was basically the same as porting from the collector and bypassing the excess exhaust more equally from all runners rather than just a single (#1) runner. I'm running an external gate from the O2 and have had to extra complications with boost control what so ever, especially at low boost levels when it's bypassing more. Or is this specific to a DSM turbine housing setup? Thx.
 
Yes, the Dsm housings have boost control related issues because they are using the same wastegate hole.

However why in the world would someone with a t3, t4, or vband manifold run an o2 wastegated setup? I’ve seen 50+ hp gains just going manifold mounted open dump vs recirculated.
 
That’s not a mitsu housing. And, it’s still worse if you run it recirculating. I’ve always thought of it as a tial v band copy with a mitsu flange.

Most people run an o2 type wastegate setup in a recirculating setup with a stock mitsu housing. Bad boost control and lower power.
 
Id like to hear more about wastegate recirc hurting power. I cant deal with atmosphere dump anymore and have a tdo5 o2 recirc. no boost control issues so far. Didnt know recirc could hurt power output though.........
 
Interesting, I run mine recirculated and have no problems controlling boost at 37psi. In what way would it be hurting power if boost is maintained and the WG is not leaking boost off early?

Are you talking about the stock mitsu housing hurting the power or the o2 housing WG setup hurting power?
 
Recirculated housings have been shown to be an exhaust restriction at certain power levels. The wastegate exhaust has to re-enter the exhaust stream and cause turbulence and overall it increases the amount of volume in the exhaust. Curt Brown made 500hp on an evo3 16 with an internal wastegate and heavily ported evo3 o2 housing so you can make power. I've heard that after about 500hp it becomes a restriction. As previously mentioned, there are examples of evos making an extra 50hp by going external.
 
The gist of it is that dumping exhaust effectively makes your o2 back exhaust bigger. If your exhaust will flow 400hp worth of exhaust efficiently you can make 500 or so hp with the same exhaust flow as 400 with an open dump because a large percentage of the exhaust is bypassing the exhaust all together.

Not to mention the turbulence.

Turbines operate on a pressure differential, just like a compressor. Every psi of post turbine pressure you lose you make big gains in turbine efficiency, which requires less drive pressure, which dumps an even higher amount of exhaust which lowers turbine flow, which lowers post turbine pressure, which...., etc.
 
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