..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.

 

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

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.

 

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.