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Dorman exhaust manifold

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PlanZero

Proven Member
1,516
263
Aug 13, 2013
Easton, Pennsylvania
I'm curious if anyone actually ever used of of these. The dorman cast iron replacement manifold for a 2g. They're $90 on rock auto. I was about to put another used mani on but it has some small cracks.
 
94, The main point the dsm wiseman is trying to get thru your thick skull is "Ill believe it when I see it" meaning that under traditional theory there should be a gasket. Why do you think they come that way from the factory? Do you think Mitsubishi designed their exhaust manifolds for creators to experiment on? Come on dude, he is just trying to help prove the point that most people prefer quality parts that were designed to work from the factory tried and true. Besides a gasket costs $20-30. Machine work and custom fabrication is expensive, and I mean quality fabrication, not your ghetto chinese welds which look like crap by the way. There are plenty of dsm bolt on turbos that could out spool and out flow your setups without ghetto fabrication or machine work. Maybe Justin should chime in on this. You don't have to get your panty's all twisted up because you don't like what other people think of your wacky experiments.
:banghead:
 
you guys are the thick sculled ones. I have proven it to work dozen times already. and others have chimed in as well saying they have have better results without gaskets on custom turbo setups as well as stock mitsu stuff. I explained it all clearly for those who can comprehend.

I am done here. if you guys want to be stupid have at it. I dont argue with stupid.
 
Really if the surface finish is fine enough, the gasket is a moot point. The gasket is only there to deform into irregularities of the surfaces. A crafty person could calculate the amount of leakage based on the Ra of the surface finishes. I would expect at worst it would be .0001% of the total exhaust flow.
 
I can see both sides of the situation.. 94 is right, There is a noticable delay between switching JUST manifolds on a small (t25/14b/16g) turbo, I have done this twice now on two separate vehicles and I'd honestly rather have the quick boost then the marginally better top end. I would much rather have a ported 2g manifold or evo manifold over an FP.

I also see how GST would question the designs, I'm guessing he is a lot more conservative and will stick to what HE KNOWS works, whereas 94 is the mad scientist and is will to take the chances to make the creations that can further this hobby (performance guys.. not just dsms) and push the envelope on what can be done.

Think about this. What do you think all the local guys said to the first guy to ever strap on an hx35 to a DSM? Both of you know a lot more about these cars then I do but each of you is so far stuck up your own ideals you can't see the other side of the argument.

You get the picture, agree to disagree, I for one will keep an eye on whatever 94 posts because it's pretty incredible to see people still fabbing things in their garage.
 
I also see how GST would question the designs, I'm guessing he is a lot more conservative and will stick to what HE KNOWS works, whereas 94 is the mad scientist and is will to take the chances to make the creations that can further this hobby (performance guys.. not just dsms) and push the envelope on what can be done.

I wouldn't call myself conservative. I've just been in the community long enough to learn there are typically better ways to do things than try and reinvent the wheel. I'm all for innovation and pushing the envelope, however, I recognize my own personal limits and abilities. That's why you'll never see anything coming out of my garage looking like the concoctions 94awdcoupe comes up with. I know I don't have the ability or proper equipment to build custom turbo setups, so, I don't. If you lack either of these things, but insist on trying anyway, more power to you. Just don't be surprised when you receive constructive criticism regarding your "innovations".

People have been modding these platforms for over two decades now, so I take full advantage of that fact. I don't see the need to reinvent the wheel when there are literally thousands of tried, true, and tested parts combinations that will net a DSM enthusiast nearly any type of performance goal they can imagine.

I think outside the box plenty, but I also recognize my abilities, limits, budget, and goals. Knowing when to stay inside the box is just as important as having the ability to step outside of it.
 
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Could just weld a v-band flange onto the stock manifold??
I have both the .64 and .85 housings for the turbo and want the option to try both housings. . I would otherwise have considered welding . I also just received the t25 internally gated housing for the turbo and wish I had considered it earlier. I always though the housing would be too wide leaving not enough room for downpipe. as it turns out its quite compact and leaves plenty of room for nice bent,. may be using that housing instead. I hate having to use external gates when internals are more compact, simpler, and lighter. I am quite certain I will be happy with the 6758 on the wagon. as such I believe the 7163 will end up on the evo 1.
 
I have both the .64 and .85 housings for the turbo and want the option to try both housings. . I would otherwise have considered welding . I also just received the t25 internally gated housing for the turbo and wish I had considered it earlier. I always though the housing would be too wide leaving not enough room for downpipe. as it turns out its quite compact and leaves plenty of room for nice bent,. may be using that housing instead. I hate having to use external gates when internals are more compact, simpler, and lighter. I am quite certain I will be happy with the 6758 on the wagon. as such I believe the 7163 will end up on the evo 1.

Get a 2nd manifold for the 2nd v-band flange?
 
This thread took a strange turn.

Personally I wouldn't use a dorman manifold, being that you can get other better for not much more. I do agree with 94awdcoupe that ceramic coating would help, but for the time and money, you could have an fp race manifold or clean ported stock unit.

I'm not even going to touch the gasket thing right now...
 
I think the problem here is the first picture Jerry posted was of a v-band hotside bolted, or what most consider "Jerry-rigged" (literally) to the bottom of a presumably flat, unmodified, mating surface of the exhaust manifold outlet. Then claiming, without saying how, there's a 150rpm spool difference that he doesn't prefer switching to a FP exhaust manifold.

Then 48hrs after the photo in question, he finally posts a picture of the manifold's mating surface actually MACHINED with a mating grove that was never mentioned. :applause:
While it may not be cost effective unless you've got access to a lathe it is a great idea, but it probably looks a bit strange with it hanging off the manifold like that. For most DSMer's (myself included) paying the $100+ for the machine work on a perfectly fine mating surface it wouldn't be very cost effective. I think I've been through (3) exhaust manifolds in the 10yrs I've owned my 2g and had to replace that metal gasket twice, putting me in the hole $16 and some change. That, and I was able to sell my exhaust manifolds after I replaced them which might be a bit tough to do with a machined groove in it like that.

But I am glad we finally got to the bottom of it, well mostly... Still waiting for the log indicating a 150rpm increase in spool up when running a FP exhaust manifold and how that's even repeatable because it's so negligible.

It isn't just Brett's job to ask how/why as site staff, it's everyone's. I'm sure that anyone with some sense (or interest) in how you mated a surface designed for a gasket with another surface designed for a v-band flange would have asked the same question. Next time, Jerry, please explain the how (like posting the photo of the machined mating surface) if someone asks a question instead of trolling the thread...


This thread has ran it's course so I'm closing it but before I do I moved the photo up to the top with the original post so a new DSMer doesn't see it without realizing the exhaust manifold's mating surface has been modified too.
 
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