Shearer Manifolds 02 Dump RELEASED!!!
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Joined: Mar 2007
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From: Virginia
Ok thanks! That makes more sence now! I guess the only thing I need to know is what first? If I were going to buy either cams or an o2 dump from YOU, what would YOU sell me first? The hp gains seem about the same right? Or dose an o2 dump "change the curve" and you FEEL more power? I guess Im going to buy BOTH eventualy, I just need to pick one for now! Thanks again!
Evolved Member
Joined: Oct 2005
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From: Ohio/California
remember diiirk also tuned it right after it was installed.
Thread Starter
Former Sponsor
iTrader: (211)
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From: South Florida
Ok thanks! That makes more sence now! I guess the only thing I need to know is what first? If I were going to buy either cams or an o2 dump from YOU, what would YOU sell me first? The hp gains seem about the same right? Or dose an o2 dump "change the curve" and you FEEL more power? I guess Im going to buy BOTH eventualy, I just need to pick one for now! Thanks again!
Mike
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Joined: Dec 2008
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From: AZ
this is why i cant figure out what i want. This is a fabulous piece!
But there im torn between the two opinions of 2 reputable shops.
But there im torn between the two opinions of 2 reputable shops.
You asked me what I "think". It's more than an opinion or what I think. We built the first 02 dump for the EVO in '03 I'd guess. I still have the flanges left for building them. Beat my head against the wall over the project but in the end went back to the stock ported housing. Then the SS housings came and found those actually worked. I also built housing with a Tial gate on them for the stock turbo and then a dump tube, found the same thing, they did not work well.
Let's not talk about the "upper right corner" which is what I call a dyno graph that has nothing going for it but "peak power" in the top end. Look at the entire graph and unless there's some BS going on with the testing or a problem with the car you are going to find the stock housing or the SS housing like we sell are the best.
Exceptions to this, a car with a SUPER restrictive exhaust on it may benefit from a dump tube as it frees up exhaust flow. A car that had a wastegate actuator rod too lose to begin with and then it was tightened up tight for the testing of the dump housing will show benefits.
Other than that I laugh at the graphs I see posted, myself and three other shops I trust have gone through the testing all with the same results.
If you want the best curve, boost control, power use a single port 10.5 housing with a good re-circulating 02 housing.
I've had 3 customers in the last 6 weeks come in for tunes with crappy boost control and poor performance, all three changed their external dump housings back out to their old 02 housings or bought new and couldn't believe the difference.
A 4" round exit hole does not flow well going into a 1-5/8" piece of tubing.
Trent built himself a custom housing, 3" 02 housing, dumped. He heard me bad mouthing them and took his off, back to back testing, same deal proved what I was talking about, even to one of my own employees, I didn't even know he had built it. Used the parts we had from 2003 that he found in the cabinet to do it.
As far as I am concerned they are BS products.
Let's not talk about the "upper right corner" which is what I call a dyno graph that has nothing going for it but "peak power" in the top end. Look at the entire graph and unless there's some BS going on with the testing or a problem with the car you are going to find the stock housing or the SS housing like we sell are the best.
Exceptions to this, a car with a SUPER restrictive exhaust on it may benefit from a dump tube as it frees up exhaust flow. A car that had a wastegate actuator rod too lose to begin with and then it was tightened up tight for the testing of the dump housing will show benefits.
Other than that I laugh at the graphs I see posted, myself and three other shops I trust have gone through the testing all with the same results.
If you want the best curve, boost control, power use a single port 10.5 housing with a good re-circulating 02 housing.
I've had 3 customers in the last 6 weeks come in for tunes with crappy boost control and poor performance, all three changed their external dump housings back out to their old 02 housings or bought new and couldn't believe the difference.
A 4" round exit hole does not flow well going into a 1-5/8" piece of tubing.
Trent built himself a custom housing, 3" 02 housing, dumped. He heard me bad mouthing them and took his off, back to back testing, same deal proved what I was talking about, even to one of my own employees, I didn't even know he had built it. Used the parts we had from 2003 that he found in the cabinet to do it.
As far as I am concerned they are BS products.
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From: South Florida
We did the same with our Evo we ran last year that ran 10.9 on Stock Turbo.. We were running consistent 11.1 or so and then we added the dump and ran 10.9... Diiirk's car with 460whp ran 10.7 with the EPM dump.. Brian Most Wanted set the Stock turbo record with the EPM 02 dump on his car along with the red ET record..
If the dump wasnt making power i wouldnt have called upon Shearer to builds us these honestly... Maybe on lower boost levels the gains arent as huge but I know on a few cars we had maxed out when we switched to the dump we got around 20 peak hp and better spool as well..
Mike
yea the gains were all around it was stuck at 424 before and after the dump you can see the results. quicker spool, holding boost better and more power. i was against the dumps when the first came out but trust me it made me a believer once i saw the gains vs. recirculating.
