M2 IC piping solution?
 

Hello All!

Has anyone found a vendor that sells a pipe to connect the M2 large (or meduim for that matter) directly to an Efini y-pipe WITHOUT using the crossover pipe?


Peace,

Michael
93 MB Touring

I've looked into it. The Efini y-pipe's studs are sort of in the way of where the M2 pipe needs to go.

I had a local fabricator machine my y-pipe so it's round with a lip ($25). Basically he just ground the areas with the studs in them off as well as the flashing from the casting process. I then put a 90 degree Samco coupler on there, cut the M2 pipe so it's straight, and VOILA! M2 large with y-pipe.

I'll post some pics.

:devil: problem solved

good enough until I go single

Sell the y-pipe and go back to stock

yeah, right

no rubbing either

how is this any different than having a normal pipe other than the 90 degree coupler? doesn't griding the studs off just make your y-pipe a normal y-pipe?

i thought this persons post was to see if there vendor who sells a crossover pipe that can hook up to the efini y-pipe and m2 ic....

i have looked into this with my ic and it looks like the bend will be too sharp to work effectively...the best way to modify your efini crossover pipe is to cut it at the flange and rotate the pipe so is goes to the other side of the filler neck where the normal m2 ic pipe goes. there is a helluva lot of fabrication to be done though...i though of having this done but it would be a pia...

Re: M2 IC piping solution?
 

No, he said

Yes, it is like using the stock y-pipe except it is the efini one which is good for ~10 more hp. That, and the fact the molded silicon coupler does a 90 degree turn a hell of a lot better than aluminum. It fits better, the pipe doesn't hit the strut tower brace, and I don't have to worry about the pipe backing out (up) like it normally would.

LOL!!!!

You think that the efini y pipe adds horsies?!?!?
They only difference is that you can bolt it to the crossover. It adds no horsepower Mr. Confusion.
'You might as well just use the stock piece. I have had all the parts mentioned in this thread so i am not spouting off about shit i dont have first hand knowledge of.
I have had a few different pipes there and i have never had any problems with them blowing off. Ok I lied once it back out and that is because I broke the t bolt clamp.
Pipes that are made properly have no kinks in the bend radius.

It seems to me like your looking to make work for yourself. The stock pice would of work just as well.

:jerkit:

kiss mine fuck face

He asked a question and I gave him the answer. If the stock part is so great, why did Mazda change the pipe to the BOV and not just the way the crossover pipe attaches? Don't be a such a whiny bitch.

Great another kid that has his facts wrong and wants to get mad at me about it. Look kid, I am just pointing out the obvious. You are mistaken about the Y pipe adding horsepower to your car. Mazda offered the upgrade so that you could eliminate the coupler (stock ones dry rot and crack causing boost leaks) So the addition the studs so that the two parts could be bolted together is an added improvement. If you are not bolting the crossoverpipe down then there is no need to use the efini part being that that the only difference is the studs on the lower unit. But hey feel free to throw out some more ridicoulous insults and prove your insecurity even more. I love it.
;)

Obviously you don't have the Efini y-pipe or you would notice that the area around the pipe to the BOV sticks out on the Efini version leaving a clear path for the air inside. On the stock pipe that came with our cars, the casting forms a hump that pokes into the airflow about an inch. It's fairly significant. If you do a back to back comparison, there is a difference, especially when the second turbo comes on. I'll post some pics if I can find my old pipe.

And don't be getting on a thread like you did calling me "Mr. Confusion" when it's plainly obvious you've never held a stock y-pipe next to an Efini y-pipe or looked inside the two to see the real difference. And yet you claim to have had all the parts we're talking about in the thread.

Correct. Fd3BOOST, look again at the inside lower halves of each version.

Ok once again Mr. Confusion. No I have never owned am efini Y pipe.

http://www.fd3boost.com/album/userim...2a9ddbc51c.jpg

Nor have I ever had a MR large IC..

http://www.fd3boost.com/album/userim...454a22b936.jpg

I have never used any other pipes.. No not at all..
http://www.fd3boost.com/album/userim...e452e9297e.jpg




http://www.fd3boost.com/album/userim...3c803fdd53.jpg

And now your going to say??

Look as far as that minor as cast hump It isnt going to make or break 10 HP. Still it would make more sense to grind that off then to grind the studs off.
No get a clue please. You might wanna get your facts stright about me before you go making assumptions.

See how much more the pipe sticks out? When you look inside, there is a major difference in the airflow path. That's where the extra HP comes from because you don't have a little hill of aluminum in the middle of the inside of the pipe.

If you say that there is a large amount of casting there that is blockingf airlfow. I will say again why would you not grind that off instead off hacking off the studs on a Y pipe?
And you say 10hp, where did you do dyno comparisons to come up with 10hp?

The casting I originally referred to when I first posted was about the seam on the outside of the pipe because it interfered with the coupler - i.e. it didn't seal smoothly/tightly. So I had it ground off. The metal around the BOV pipe can't be ground off because the actual shape of the pipe is different. It's not a matter of some extra material inside because otherwise, yeah, that would be cheaper and easier. The only way I can describe it (without going down now at 1:30 a.m. and trying to find my stock y-pipe) is the area around the BOV pipe is concave (it bends inward) on the stock y-pipe while the Efini casting is convex (it curves out).

Are you referring to the small lip around the pipe to keep the coupler seated?
And your saying that it is bent inward arounf the lip on the stock pipe?
If so we are talking what, maybe 1/4" around the edge?
And yes grindging that down/off or removing to open the area up would be an improvemnet. I find it hard to belive that it would consitute for 10hp.
Maybe 2-3 tops.
Feel free to try to prove me worng with some dyno time.

Anyway. I wont be here to defend my position man.
Off to sleep.
Pm me tomorrow if you wanna get this thread going again but i still say your exaggertaing the hp gain from it.

I know, I have to go to bed too. 10 hp? That's what I've heard on many occasions but I have never dyno tested JUST the y-pipe. Too much of a PITA to get off and on. Here's a link, look at the 3rd & 4th from the bottom photos on the page.

http://reganrotaryracing.tripod.com/efini.htm

lmfao...10 hp. You'd be an idiot to think 10 HP would be added by a PIPE. If that was the case, EVERYBODY would be changing their intercooler piping so it could use the greddy elbow...they'd probably gain close to 50 hp there(more than a full exhaust would give you)

i agree with devilish. think of it like a lightened flywheel. any intercooler piping that increases flow rate will provide more horsepower in the rpm band, but that doesnt mean peak hp will go up. you should be able to measure an increase before the switch over to both turbos as it was designed to do but when the second turbo is on there should be no difference. on a stock rx7 with stock precat and intake, i could easily see it getting 10hp. on free flowing intake, exhaust, probably doesnt make too much of a difference as the turbos are already being pushed.

https://reganrotaryracing.tripod.com/yincomp.jpg


Ok this is what iassmued you were talking about originally. Yes that is a sizeable obstruction..But 10hp? Idoubt it. But I did never notice that between the two pipes.
I see what you were getting at but it still isnt adding 10hp to your car.

I don't see where this is called for.... Tone it down or be added to the ever increasing ban/warning list.

..or they might add downpipes or midpipes to gain power.. ;)

regardless of volume removal and path clearance of 1 standard inch..
to produce a number of 10 horse power from such a mod is completely absurd...
it absolutely amazes me how one can draw up such a number...
for those of you who consider the possibilty.. take into consideration that the number produced is simply an assumption..

It's what Mazda Comp. quotes (they actually say 10-15hp). Not to mention, it does give you about an extra pound of boost. The obstruction is right in front of the pathway for the second turbo.

This is why the forum pisses me off to no end, and why I usually stay away from it. The ORIGINAL question was how to use the Efini Y-pipe with an M2/ASP set up. Not the extent to how benefitial it was. The guy asked (as have countless others in the past) how it could be made to work & I told him how I did it. As opposed to all the posts where people say it's impossible. People ask the question for a reason - we like our Efini y-pipes. They do make a difference whether you want to believe it or not. The difference is probably not as big with a straight exhaust, intake, and IC. When I installed it though, every other mod was already done, and I roughly gained an extra pound of boost. No bullshit.

This was discussed countless times on the big list years ago, and you can still read some info over on Lightning in a World of Thunder.

As for all the people who have PM'd/e-mailed me - you can get the coupler from BRITS (707) 935-3637. It's a 90 degree elbow/coupler with an I.D. of 70mm/2.75". I guess they don't feel like being jumped on by a bunch of primadonnas if they posted the question.

Just buy mine and I will include the stock pipe. :D

You really ought to lose your ego. Your 10hp claim seems inaccurate wether or not mazdacomp claims it or not. I mean you don't provide any info to back it up other than saying "oh mazdacomp said so and I read it on the biglist. If you dont provide something to back up your claim don't get mad at me for calling your BS out.
Also this is a public forum and all topics are open to debate. So when I see something i think is BS I will definitely call it out. Does the Y pipe have a better air flow, from the pics your linked me to yes it shows an open air flow. Will it produce 10 Hp over the stock part? I seriously doubt it.
And just for my own satisfaction, your the guy who got all pissy when I was laughing at your 10hp claim.
Acting like a child and cursing at those who question you is silly so why do it man?

You said 10hp from Y pipe. I say :bsmeter:

Like I said like four posts ago. Feel free to prove me wrong. I have yet to see that.
So enjoy hacking up your $125 Y pipe for a possible 2-3 hp gain.

nice

surprised mazdacomp would make such claims..
i gather they have the appropriate dyno results as proof...
considerin the clientele they support arent ignorant to written claims..
please provide the link where mazda motorsports indicates the hp increase...
misinformation can happen.. case in point.. the new eight hp claims..

Consider the HP claims Mazda made regarding the RX-8!!.... That little mistake is costing them $$$ according to what I've heard. Apparently, they overstated the HP.

Bottom line IMO, Dyno slips are far more compelling evidence than unsupported claims....

Can we get back to the topic? Does anyone know of a simple, bolt-on solution? I am quite interested in this as I have the Efini Y-Pipe and am considering an intercooler upgrade.

As stated by turbojeff in the second post on this thread, there is no "simple bolt-on solution". I've checked it out too, and unfortunately the only route is to do the machining to fit a coupler of some sort (either a 90-deg elbow like was shown, or a straight coupler to an aluminum piping setup) that will connect to the intake side of the IC end tank. One of the efini Y-pipe crossover pipe studs is in the way if you tried to fabricate something that used that attachment style.

The Efini crossover pipe vs. the stock crossover pipe is more likely where more of the increased flow comes from. The stock crossover is necked down quite a bit where the little plastic flange is attached.

The Efini y-pipe by itself is not good for 10hp by itself.

The 10hp that Mazda changed the HP rating on the '96 was also probably due to the changes adding the y-pipe and changing the IC piping to and from the IC. IIRC the 96+ cars lost some of the "ribbing" on the 93-95 cars.

Jeff

Wow, like 10HP is that much?? You people need to see that it is all relevant! In a dog 3rd gen with a haggard old motor making 190HP at the wheels this pipe would do nothing, yes...but in a modified TT FD with not many other restriction I could see this very easily making 10HP, maybe more. It all depends on where the bottleneck is in the system. I spent countless hours port matching and removing obstructions to the airflow (like the double throttle division in the UIM) in the intake track when I built my engine last December, almost went as far as to devcon some old ports (air bypass) in the primary runner in the name of laminar flow but I was lazy.

This seems like a very reasonable claim of 10HP, just the decreased restriction on that secondary turbo compressor ALONG with the decreased restriction on the exhaust turbine that would cause should account for that 10HP.

Tell you all what, when I get this paint job paid for I will get a efini y-pipe bottom and mod it like Devilish (thanks BTW, great work!) to work with my M2 large and run it back-to-back on a dyno to see what I get. I am also probably going to get rid of my sleeper Borla exhaust in favor of a little less restriction. We will see if I can get her up in to the 375RWHP range on the stock turbos.

Jon
'93 TGM base('99 body upgrades)
354 RWHP on stock twins at 13psi

Can't wait for this dyno. Then "we" can send this to MazdaComp and request that they change their HP claim from 10-15 HP to 2 HP.

This whole thread is haggard if you ask me.

The problem is with 375rwhp 10hp (only 8.5rwhp anyway) is in the noise. You can dyno your car back to back with NO changes and get quite a variance. Any other changes, like moving the IC fan, outside air temp, etc will make it even worse.

I'd believe 10hp with the y-pipe and all IC piping off a 96+ car. Remember that is what changed from 95 to 96, not just the y-pipe.

Dyno Info
 

Some three years ago I back to back dyno tested the stock y pipe and the efini y pipe. The results:

Stock: 286.7hp torq. 261.8

Efini: 304.0hp torq. 286.5

Also I have been with Mazda Comp since 94 and instruct with Ferrari, Porsche, Bmw & Trackmasters

10hp gain w/efini y-pipe? It could possibly be that much. If you guys haven't read my thread about pressure loss on the stock system, then you might be suprised how much hp that can be released with a less restrictive piping set-up. Also maybe the 10hp is achieved in addition to other modifications(which you can see above in "JACK's" post). Think about this example, you could add all the intake mods and boost you want, but you are not going to get the full benefits of those mods if you are still using the "complete"stock exhaust system. Another example, people who are overweight. Some eat large amounts of food, but their metabolism isn't capable of buring the food off efficienly enough to help the loss weight.