mrdouble99
Member
- :
- Mazdaspeed3
I'm gonna buy one and see and feel the quality with my eye's 
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an alternative browser.
You should upgrade or use an alternative browser.
My Ebay DP
- Thread starter mazdaru
- Start date
uthemang31
Member
- :
- 2009 Mazdaspeed 3
Do you if this is the same RaceRoot DP sold by PG? Upon more research, they look the same.
Looks like a nice product. But I have to disagree with you in one respect. I'm running a full catless dp/rp combo from TuboXS. IMHO, no downpipe is going to help you make power above 5,500 rpm on stock tune and turbo. When that throttle plate starts closing, it's reducing the amount of air going into the engine, so there is a corresponding reduction in the available flow out of the exhaust side.
When you dyno the car or check with a stopwatch or accelerometer or other way to objectively measure performance, what I think you will find is that a good downpipe produces huge power gains in the midrange and up to 5,500 rpm, but not at higher rpm on stock tune and turbo. Yes, those gains are substantial. There is a fantastic "under the curve" gain when comparing this to stock, but it's all happening before 5,500.
But you can't defy the limits of the stock K04 turbo or overcome the effect of the closing throttle plate after 5,500 rpm. The air just gets super heated at that point if boost is above about 15 psi, power goes down and the throttle plate starts protecting the turbo.
For $170 this is a super deal. Great find.
I did notice that the second 02 bung is way up on the pipe, only a couple inches from the first, rather than down lower. That is much different than on the TurboXS downpipe. It looks more like it was designed for a second wideband 02 sensor rather than for the post-cat sensor. Does that really prevent CEL's?
Edit: Oh, I see now that it has three bungs, two up top and one down below where the stock cat would have been. That's a good thing and probably explains why no CEL's so far. My bad for not noticing.
When you dyno the car or check with a stopwatch or accelerometer or other way to objectively measure performance, what I think you will find is that a good downpipe produces huge power gains in the midrange and up to 5,500 rpm, but not at higher rpm on stock tune and turbo. Yes, those gains are substantial. There is a fantastic "under the curve" gain when comparing this to stock, but it's all happening before 5,500.
But you can't defy the limits of the stock K04 turbo or overcome the effect of the closing throttle plate after 5,500 rpm. The air just gets super heated at that point if boost is above about 15 psi, power goes down and the throttle plate starts protecting the turbo.
For $170 this is a super deal. Great find.
I did notice that the second 02 bung is way up on the pipe, only a couple inches from the first, rather than down lower. That is much different than on the TurboXS downpipe. It looks more like it was designed for a second wideband 02 sensor rather than for the post-cat sensor. Does that really prevent CEL's?
Edit: Oh, I see now that it has three bungs, two up top and one down below where the stock cat would have been. That's a good thing and probably explains why no CEL's so far. My bad for not noticing.
Last edited:
dude, if you think that you arent picking up more power from the dp above 5500rpms. you are sadly mistaking. think of the power loss(the feel) with stock dp/tp after 5500rpms. if there was no power gain above 5500rpms, it would be even more drastic. think about what you are saying, it doesnt make sense. i suggest you go look up more dyno sheets of people on stock tune with mods. not to mention, i have a FMIC which is allowing me to hold cooler Bats for longer compared to stock tmic
i never said it was huge gains but there are def gains. the car pulls to 6k+ with less effort compared to stock dp
i going to hit the dyno and post facts that we are picking up power above 5500rpms even thoough the throttle plate is still closing.
i guess its an extender to prevent CELs. also, the bung in pretty much the same place as that sensor is on the stock dp
i never said it was huge gains but there are def gains. the car pulls to 6k+ with less effort compared to stock dp
i going to hit the dyno and post facts that we are picking up power above 5500rpms even thoough the throttle plate is still closing.
i guess its an extender to prevent CELs. also, the bung in pretty much the same place as that sensor is on the stock dp
Last edited:
dude, if you think that you arent picking up more power from the dp above 5500rpms. you are sadly mistaking. think of the power loss(the feel) with stock dp/tp after 5500rpms. if there was no power gain above 5500rpms, it would be even more drastic. think about what you are saying, it doesnt make sense. i suggest you go look up more dyno sheets of people on stock tune with mods. not to mention, i have a FMIC which is allowing me to hold cooler Bats for longer compared to stock tmic
i never said it was huge gains but there are def gains. the car pulls to 6k+ with less effort compared to stock dp
i going to hit the dyno and post facts that we are picking up power above 5500rpms even thoough the throttle plate is still closing.
i guess its an extender to prevent CELs. also, the bung in pretty much the same place as that sensor is on the stock dp
Stock DP is not what restricts the power past 5500rpm. It's the stock tune. So unless you're changing the tune, the only things different past 5500rpm are vibration and noise.
Saskatchewan17
Member
- :
- 2008 TR Mazdaspeed 3
THIS. You will get gains, but the general trend of the throttle plate closing past 5500 will still be there. So the car might pull better than it did with a stock DP/TP, but it will still 'hit a wall' at some point. The wall will just seem... 'shorter' if that makes any sense. Even with just my TP I shift at 5800 now because the car keeps pulling up untill that point (and even a little bit more, maybe 6100).i never said it was huge gains but there are def gains. the car pulls to 6k+ with less effort compared to stock dp
i going to hit the dyno and post facts that we are picking up power above 5500rpms even thoough the throttle plate is still closing.
I honestly belive that OP's dyno sheets will prove that it is senseless to try to make power above 5,500-5,800 rpm on the stock tune. The steep decline in power will be the same. What will be really telling is how far and how fast the torque (rather than just hp) is falling off the cliff.
Yes, because you have built a higher peak housepower by 5,500 rpm, that higher peak will trend down at about the same rate as stock, so technically, you can say that it makes more "power" above 5,500 rpm. But it will remain fact that it is better to shift, even to shift back at 5,500 rpm so that you fall back into the fat part of the power curve and ride it back up rather than chase the power rapidly falling off the cliff, even though it might look better on paper. When you dyno look closely at what the torque curve looks like at high rpm.
Bear in mind, please, that the K04 turbo has a tiny 5mm size center shaft that is surface hardened with inconel. This turbo's tiny center shaft cannot withstand EGT's above 1,500 degrees for very long before it softens and sags, with resultant turbo failure. Check out the Neuspeed tuner company's experience with this turbo on their upgrade for VW-Audi applications. They found out the hard way that when boost is allowed to sustain above 15 psi and rpm exceeds 5,800 rpm, they were getting a rash of turbo failures due to center shaft softening. There is even a "sticky" on this subject on the "other board" -- the one with "speed" in its name.
By adding a downpipe on our application also please note that boost levels on stock tune go up by 1.5 to 2 psi. That holds true out to higher rpm as well. This is great, actually fantastic, for midrange power increase. It is not so good for sustained WOT beyond 5,800 rpm on stock tune.
Finally, please bear in mind that I am not knocking the Ebay DP or OP for putting us onto it. It seems to be a great value and should build great power. I highly recommend dp/rp upgrades. All I am saying is that while it does wonders for midrange power improvement up to the maximum efficiency of the K04, which pretty much is over at 5,500 (5,800 if you stretch it), it is not a magic bullet that will transform the K04 into something it is not or justify trying to run the engine out to redline or even near that. Ain't gonna happen.
On the other hand, a tune will help with this, provided it tapers the boost back to 15 psi when you go past peak efficiency on the turbo, keeps EGT's at or below 1,500 degrees F. and then allows the throttle plate to stay open longer.
Yes, because you have built a higher peak housepower by 5,500 rpm, that higher peak will trend down at about the same rate as stock, so technically, you can say that it makes more "power" above 5,500 rpm. But it will remain fact that it is better to shift, even to shift back at 5,500 rpm so that you fall back into the fat part of the power curve and ride it back up rather than chase the power rapidly falling off the cliff, even though it might look better on paper. When you dyno look closely at what the torque curve looks like at high rpm.
Bear in mind, please, that the K04 turbo has a tiny 5mm size center shaft that is surface hardened with inconel. This turbo's tiny center shaft cannot withstand EGT's above 1,500 degrees for very long before it softens and sags, with resultant turbo failure. Check out the Neuspeed tuner company's experience with this turbo on their upgrade for VW-Audi applications. They found out the hard way that when boost is allowed to sustain above 15 psi and rpm exceeds 5,800 rpm, they were getting a rash of turbo failures due to center shaft softening. There is even a "sticky" on this subject on the "other board" -- the one with "speed" in its name.
By adding a downpipe on our application also please note that boost levels on stock tune go up by 1.5 to 2 psi. That holds true out to higher rpm as well. This is great, actually fantastic, for midrange power increase. It is not so good for sustained WOT beyond 5,800 rpm on stock tune.
Finally, please bear in mind that I am not knocking the Ebay DP or OP for putting us onto it. It seems to be a great value and should build great power. I highly recommend dp/rp upgrades. All I am saying is that while it does wonders for midrange power improvement up to the maximum efficiency of the K04, which pretty much is over at 5,500 (5,800 if you stretch it), it is not a magic bullet that will transform the K04 into something it is not or justify trying to run the engine out to redline or even near that. Ain't gonna happen.
On the other hand, a tune will help with this, provided it tapers the boost back to 15 psi when you go past peak efficiency on the turbo, keeps EGT's at or below 1,500 degrees F. and then allows the throttle plate to stay open longer.
Last edited:
vids. quality isnt the best. ineed to update the radio on my phone again b/s the mic sounds like s***
the drive bys could have been better. my friend kept letting off as he passed the camera so blame the fail on him haha. will get better clips.
YouTube - Mazdaspeed 3 Catless DownPipe 1 Resonator Delete 1
YouTube - Mazdaspeed 3 Catless DownPipe 1 Resonator Delete 2
YouTube - Mazdaspeed 3 Catless DownPipe 1 Resonator Delete 3
YouTube - Mazdaspeed 3 Catless DownPipe 1 Resonator Delete 4
the drive bys could have been better. my friend kept letting off as he passed the camera so blame the fail on him haha. will get better clips.
YouTube - Mazdaspeed 3 Catless DownPipe 1 Resonator Delete 1
YouTube - Mazdaspeed 3 Catless DownPipe 1 Resonator Delete 2
YouTube - Mazdaspeed 3 Catless DownPipe 1 Resonator Delete 3
YouTube - Mazdaspeed 3 Catless DownPipe 1 Resonator Delete 4
tazman34685
Member
- :
- MadzaSpeed 3
The onlyproblem I see is in the quality on the downpipe itself. Will it hold up over time. The heat cycle caused by the turbo may show over time...
monstersix
Member
- :
- 2006 mazdaspeed 6
i have a question, i have a speed6 i want a DP but i dont wanna spend 600 buck, so the Ebay DP?
its catless, heard its pretty good quality, is this a good buy or should i really get a catted dp?
i have a 3" custom exhaust no muffs, or cat, i want a dp and the ebay one loooks just like the atp.
i know eventually ill get a cel, has any one had any probs with the ebay dp's for the mazdaspeeds?
its catless, heard its pretty good quality, is this a good buy or should i really get a catted dp?
i have a 3" custom exhaust no muffs, or cat, i want a dp and the ebay one loooks just like the atp.
i know eventually ill get a cel, has any one had any probs with the ebay dp's for the mazdaspeeds?
mrdouble99
Member
- :
- Mazdaspeed3
Ebay DP is holding up well. looks great, no issues.
just an update for those who are interested
Very good to know
Thanks for the update
Dan
New Posts and Comments
- Replies
- 10
- Views
- 249
- Replies
- 21
- Views
- 5K