Well, this sucks... but dyno's don't lie!

Swapping out the stock O2 housing and downpipe with the O2 housing eliminator downpipe from Ultimate Racing had virtually zero effect on top end power, and cost me some spool up (droped one PSI on my initial boost spike) and due to the spool up cost me some low end power even though my peak torque reading is actually identical numerically.

David thinks that the O2 housing eliminator down pipe may have more of a benefit on a car with an upgraded turbo (Blouch turbo, bolt on GT30 etc) even though it shows no benefits for a stock turbo car.

Based on my cars weight of 3750 with me driving (weighed in race trim at truck scales +/- 20 lbs) and trap speed my last trip to the 1/4 mile I was making aprox 405 CRANK HP. Since I made 295 on Davids dyno befor putting on the Ultimate Racing down pipe and doing the math for his dyno's average difference from crank HP (average EVO X MR makes about 210 wheel HP on his dyno) that would put me at 408 CRANK HP... pretty close match up! Using that as a reliable yard stick, my wheel torque figure would put me at 430 CRANK torque.

So, (knocking on wood here) my EVO X MR is making aprox 400 crank HP and 430 crank lb-ft of torque with no transmission issue so far.

Keith

http://www.evoxforums.com/forums/attachment.php?attachmentid=2253&d=1226468592

Feel free to remove it and sell it to me for cheap. :)

Feel free to remove it and sell it to me for cheap. :)

If installation wasn't a cast iron bitch I would do that!

Keith

Wow, this is quite disappointing. You may expect little gain with stock turbo, but loss of power boost? Nooo

godspeed brother.

Thank you for posting!!!

I have a MR and I was thinking to do the same, but I was going to use the G-force Garage (Japan).

Keep us posted if you have any issues with the SST.

What other mods had you done to you car?

THX!!!!!!!!!!!!!!!!!!!:rock:

put a bigger turbo on it and u will get a huge gain i bet

It was good to see you Keith. Glad you made the trip out. Always a pleasure bud!


Feel free to remove it and sell it to me for cheap. :)

Why would you still want to spend your money on something after it was proven to make 1whp?:tumbleweed:


Thank you for posting!!!

I have a MR and I was thinking to do the same, but I was going to use the G-force Garage (Japan).

Keep us posted if you have any issues with the SST.

What other mods had you done to you car?

THX!!!!!!!!!!!!!!!!!!!:rock:

I know im not Keith but I can answer this. He is all Buschur Racing parts except the downpipe. 3" Catback, FMIC, Upper & Lower IC Pipe, BR Mass Pipe w/ Air Filter & Tune.

It was good to see you Keith. Glad you made the trip out. Always a pleasure bud!




Why would you still want to spend your money on something after it was proven to make 1whp?:tumbleweed:




I know im not Keith but I can answer this. He is all Buschur Racing parts except the downpipe. 3" Catback, Upper & Lower IC Pipe, BR Mass Pipe w/ Air Filter & Tune.

You forgot the huge Buschur Racing FMIC Jrod :) I also have the forge wastegate actuator with zero extra pre-load... just enough tension to not have the wastegate open at idle.

Keith

You forgot the huge Buschur Racing FMIC Jrod :) I also have the forge wastegate actuator with zero extra pre-load... just enough tension to not have the wastegate open at idle.

Keith

Its early.... give me a break Keith. :coffee:

Thx for the post. I was torn between doing this. Perrin told me basically the same thing when I asked if there would be any benefit to getting their turboback as oppose to the O2 dump downpipe. This is good info. Thx for sharing sorry it was a waste of money for you.

I just installed the full UR system w/the o2/downpipe.....it was a pain to put on. It is disapointing to hear this but I am still happy with my purchase. It complete's my exhaust.

so basically it's not needed to change the o2 and still get a downpipe? that would be nice because changing that o2 housing is a pain in the yahooooo.

i guess testing will have to be done on the power gains then.

G-Force Garage makes some serious nice parts for our cars. I was looking at their manifold, downpipe and high flow cat but they costs an arm and a leg.

Thank you for posting!!!

I have a MR and I was thinking to do the same, but I was going to use the G-force Garage (Japan).

Keep us posted if you have any issues with the SST.

What other mods had you done to you car?

THX!!!!!!!!!!!!!!!!!!!:rock:

Changing the o2 housing with UR's o2 downpipe and high flow cat made a huge difference on my evo x. If you measure the stock o2 housing, it is the most restrictive point in the exhaust system.
Before the o2 and high flow cat, I had a catback which made some nice gains as well. The gains with the o2downpipe brought alot more power in low rpms and more boost in low rpm, that was the first thing I noticed when driving it. It also made it easy for me to perform 4wd donuts on dry asphalt. The full exhaust is the only way to go, stock turbo or not. The exhaust note also changed dramatically once the full exhaust was installed. you might want to sell it if off you belive it to be worthless.

Changing the o2 housing with UR's o2 downpipe and high flow cat made a huge difference on my evo x. If you measure the stock o2 housing, it is the most restrictive point in the exhaust system.
Before the o2 and high flow cat, I had a catback which made some nice gains as well. The gains with the o2downpipe brought alot more power in low rpms and more boost in low rpm, that was the first thing I noticed when driving it. It also made it easy for me to perform 4wd donuts on dry asphalt. The full exhaust is the only way to go, stock turbo or not. The exhaust note also changed dramatically once the full exhaust was installed. you might want to sell it if off you belive it to be worthless.


good news for me!! thanks for the info.

Changing the o2 housing with UR's o2 downpipe and high flow cat made a huge difference on my evo x. If you measure the stock o2 housing, it is the most restrictive point in the exhaust system.
Before the o2 and high flow cat, I had a catback which made some nice gains as well. The gains with the o2downpipe brought alot more power in low rpms and more boost in low rpm, that was the first thing I noticed when driving it. It also made it easy for me to perform 4wd donuts on dry asphalt. The full exhaust is the only way to go, stock turbo or not. The exhaust note also changed dramatically once the full exhaust was installed. you might want to sell it if off you belive it to be worthless.

do you have dyno of before and after to support the claim?

Changing the o2 housing with UR's o2 downpipe and high flow cat made a huge difference on my evo x. If you measure the stock o2 housing, it is the most restrictive point in the exhaust system.
Before the o2 and high flow cat, I had a catback which made some nice gains as well. The gains with the o2downpipe brought alot more power in low rpms and more boost in low rpm, that was the first thing I noticed when driving it. It also made it easy for me to perform 4wd donuts on dry asphalt. The full exhaust is the only way to go, stock turbo or not. The exhaust note also changed dramatically once the full exhaust was installed. you might want to sell it if off you belive it to be worthless.

The exhaust note change sounds like it was from the High Flow Cat. I know most people are reporting a deeper tone to the exhaust with a High Flow Cat as opposed to a Catless Race Pipe. I'm debating whether to go with a O2/Downpipe myself. Until I see more dyno proof to confirm that it does make more power, I'm going to hold off on it.

AMS is in the process of making one...i dont know if they are having much success because it is still in R&D..i know there is a thread on it over at evom. Im waiting patiently for the results of that. Early testing showed an increase of 12-15whp i believe..actually wait i found it...

http://forums.evolutionm.net/showthread.php?t=328463&highlight=ams

i have the xtremeboost O2 Downpipe with Waste Dump, this made nice top end WHP on the butt dyno. i did not dyno it by itself, but it was deffinatly worth the money. if you dont mind a loud dump.

i have the xtremeboost O2 Downpipe with Waste Dump, this made nice top end WHP on the butt dyno. i did not dyno it by itself, but it was deffinatly worth the money. if you dont mind a loud dump.

meat- cruising on the highway with no boost- is it audible, was there an increase in DB? Obviously under boost its going to be loud. Any input would be great.

meat- cruising on the highway with no boost- is it audible, was there an increase in DB? Obviously under boost its going to be loud. Any input would be great.

normal day to day driving, not loud at all. just crusing its a little quiter. but under boost its like a open header Honda. You wont even hear you exhaust anymore. all you hear is the wastegate dumping.

These results contradict others test results but also bear in mind this was on an MR. I'm sure they'll test on a GSR soon. I love my UR pipe and made a huge difference with no spool up time increase at all. I have a GSR myself. I also now have an FP red and it spools up before 4000 RPM which is great for such a large turbo. I could not be happier.

normal day to day driving, not loud at all. just crusing its a little quiter. but under boost its like a open header Honda. You wont even hear you exhaust anymore. all you hear is the wastegate dumping.

haha sweet...

These results contradict others test results but also bear in mind this was on an MR. I'm sure they'll test on a GSR soon. I love my UR pipe and made a huge difference with no spool up time increase at all. I have a GSR myself. I also now have an FP red and it spools up before 4000 RPM which is great for such a large turbo. I could not be happier.

Hey Dan,

What dyno did you test on? There is litteraly 100 RPM difference in spool up, something you will never be able to notice on the street while driving... differences that small are hard to detect even with a data logger depending on it's sample rate!

I saw damn near 30 HP gains between my last trip to Buschur Racing and this trips "before" dyno run. Those gains were from using parts that did NOT come from Buschur Racing (forge WG actuator and UR test pipe) so I hope people are not looking at this as some kind of bias against "non-Buschur parts" on Daves Dyno.

When I made 270 lb-ft of torque on Daves Dyno people (including the tunner) were speculating that I was at the limits of what the MR's transmission computer would allow the engine to make without screwing with the system to reduce torque. This trip I made 312 lb-ft of torque with no signs of the transmission computer messing with anything.

I did make sure that the dyno runs were made in S-Sport mode, with traction control completely turned off... something I am NOT sure of with the tunner running the show last time I was at Buschur Racing because he dosn't seem to listen, so you don't know if he does as requested.

Keith

Just a side note,

Anyone who put this part on, and put on a test pipe at the same time.... guess what? YOU SAW HUGE POWER GAINS! AMAZING... guess what part caused the power gain. You don't know because you put them both on at the same time.

I saw 30 HP gains from a test pipe and forge WG actuator. How much of that is from the test pipe and how much from the WG actuator? Beats the shit out of me! If someone asked me and I said both parts helped me make a lot more power I could be 100% wrong with all of the power gains from the test pipe and none from the WG actuator (or the other way around) and I would never know.

Keith

what is the diff between a O2 downpipe and a regular downpipe?

which one is better ?

O2 housing downpipe also replaces the elbow off the turbo outlet. A regular downpipe is only the lower pipe after the elbow and before the cat.

Based on my cars weight of 3750 with me driving (weighed in race trim at truck scales +/- 20 lbs) and trap speed my last trip to the 1/4 mile I was making aprox 405 CRANK HP. Since I made 295 on Davids dyno befor putting on the Ultimate Racing down pipe and doing the math for his dyno's average difference from crank HP (average EVO X MR makes about 210 wheel HP on his dyno) that would put me at 408 CRANK HP... pretty close match up! Using that as a reliable yard stick, my wheel torque figure would put me at 430 CRANK torque.


Just a question on this. If your estimating a crank output of 405hp/430tq but seeing awhp of 295hp/297tq that would mean a parasitic loss % of:


hp loss of approx 28.5%
tq loss of approx 31%


Thats seems a bit high? I'm in NO way an expert, just asking the question so i can learn more.


Thanks!

Man here I am decided on getting an o2/dp and know I read this. It seems every week someone posts something that contradicts another posts. I am know officially confused and on the fence on what to get.

have no fear, iam here. mines going on today (with no bigger turbo) so ill have dyno numbers tomorrow =]

have no fear, iam here. mines going on today (with no bigger turbo) so ill have dyno numbers tomorrow =]

your my hero, seriously post up the results ass soon as you can tomorrow