Ebay Sohc Header

This is the place to ask questions about your engine components like cams, valves, pistons… just anything that is generally "engine" specific. This also includes questions about exhaust systems such as exhaust manifolds, piping size, mufflers, ect...
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Danteneon
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Post by Danteneon » Thu May 24, 2012 1:27 pm

Dranz wrote:It is true that reading one cylinder takes the other three out of the equation. However, a malfunctioning injector causing a lean condition will more likely trimmed up on fuel for all the cylinders masking the original problem. The standard narrow band sensor uses millivolts and has a very narrow reading area. It is unlikely that a slow switching planar sensor will catch a problem with one cylinder. Fuel trims on our vehicle can reach +/- 25%. More than enough to fool an oxygen sensor into thinking everything is fine. You guys are giving this type of sensor way too much credit.
Again, no one is arguing that the stock O2 sensor is a wunderkind, but placing the best wideband sensor in the middle of a primary tube of one cylinder is not going to help matters either. The point was raised to illustrate that the location of the sensor is what's important.
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Post by chris1211 » Thu May 24, 2012 3:35 pm

i have a ebay 1 from motor sport house i had to remove the cat but i got a high flow 1 welded on he new down pipe it was just like this header i got a 9 hp gain on the dyno
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Post by Dranz » Thu May 24, 2012 4:58 pm

Danteneon wrote:Again, no one is arguing that the stock O2 sensor is a wunderkind, but placing the best wideband sensor in the middle of a primary tube of one cylinder is not going to help matters either. The point was raised to illustrate that the location of the sensor is what's important.
I would not place a wide band in one primary. Ever. That truly is one that would need to be in the collector or somewhere sampling all the cylinders. A regular O2 just isn't accurate enough to care about placement. It just not physically capable of switching fast enough to determine what is coming from where. It uses the ambient air on the outside of the sensor and compares it to the air in the exhaust stream. It just doesn't switch quick enough to catch a problem with one cylinder. It kinda averages everything together and comes out with a rough estimate of where it should be. That's why it really doesn't matter if you sample just one or all. It's not even used at WOT... It goes back into WOT fuel map. You cannot tune with it, you can barely tell if anything is wrong unless it's way wrong. But expecting a planar oxygen sensor to be able to throw a code when one cylinder has an issue is more than it can handle. It can handle stft and ltft by using the average it comes up with, but that's the limit of its usefulness.

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Post by Donkeypuncher » Thu May 24, 2012 6:11 pm

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Post by ragek23 » Thu May 24, 2012 9:29 pm

Donkeypuncher wrote:Image
:withstupid: :D

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Post by heydockyle » Fri May 25, 2012 11:31 am

My header question caused such a debate. I just wanted to know if a cheap ebay header would bolt up to stock exhaust so I could replace my shitty stock unit on my (already slow as balls) daily sohc...
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Post by Dranz » Fri May 25, 2012 3:37 pm

Why yes it will.

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Post by chris1211 » Fri May 25, 2012 6:47 pm

no it wont fit becuase oof the way its angled you have to remove the stock cat
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Post by Dranz » Fri May 25, 2012 8:34 pm

The eBay header comes with a dp. Those two are a bolt in replacement. Not sure if you caught that info at the beginning. Or I took his question the wrong way... Either way, what you're buying will fit one way or another.

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Post by heydockyle » Fri May 25, 2012 11:43 pm

Was looking for it to be a direct fit, with the stock cat, not the catless downpipe.

Don't mind a TINY bit of modification as I have a cutoff wheel and a welder, but looking to do nothing that is time consuming.
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Post by chris1211 » Sat May 26, 2012 12:17 am

Its deff not a direct fit to the cat some mod would have to be done not sure how much tho
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Post by ragek23 » Sat May 26, 2012 3:45 pm

Its very close. I think I got mine to fit the first time. With a cutoff wheel and a welder your are more than good to go to get to fit.

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Post by chris1211 » Sun May 27, 2012 11:38 am

For sure
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RobsProjectSOHC
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Post by RobsProjectSOHC » Mon May 28, 2012 9:32 pm

heydockyle wrote:My header question caused such a debate. I just wanted to know if a cheap ebay header would bolt up to stock exhaust so I could replace my shitty stock unit on my (already slow as balls) daily sohc...
oh i chuckled at this.....i was reading for more debates and BAM...lol, i get mine in 2-3 days....ill take pics and stuff. From sounds of it, i might want a new sensor before doing this operation.
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Post by RobsProjectSOHC » Thu May 31, 2012 7:27 pm

Seller is good, received it yesterday but I worked all night. Well here it is.

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Post by chris1211 » Thu May 31, 2012 8:31 pm

Yep looks like mine let me know if u feel a diffrence
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Post by occasional demons » Thu May 31, 2012 8:38 pm

With all else stock, you won't see much difference. It is a step up over the cast manifold for sure.

The biggest thing I noticed when going to the oem R/T manifold over the cast iron , is the exhaust note sounded a bit more pleasant.
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Post by chris1211 » Thu May 31, 2012 9:04 pm

with my intake and exhuast u could really feel it in the higher rpm
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Post by RobsProjectSOHC » Thu May 31, 2012 9:23 pm

Im going to wait till I get High flow Cat....then do the work. Get rubber on the tires and then hit the dyno. Getting paid ever two weeks sucks but I know it will work out.

Also, that would be good for hp....I have magnum intake, crane 12, udp, now I just need exhaust to get that flow going.
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Post by chris1211 » Thu May 31, 2012 10:57 pm

http://performance-curve.com/410225-225 ... erter.aspx i have this cat and am very pleased with it i wastold from neon tuners to get this 1 and it works great really frees up the air and a great price look into Imageit
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Post by RobsProjectSOHC » Fri Jun 01, 2012 9:08 am

chris1211 wrote:http://performance-curve.com/410225-225 ... erter.aspx i have this cat and am very pleased with it i wastold from neon tuners to get this 1 and it works great really frees up the air and a great price look into Imageit
Do you have any exhaust clips? Curious what it sounds like.


Edit: Bought it anyways, for 50$shipped I couldnt complain. lol
But would like to hear it.
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Post by chris1211 » Fri Jun 01, 2012 10:37 am

http://www.youtube.com/watch?v=beSv0hcrEUE at 30sec its with a cheap cheap muffler but i like the sound
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Post by FAC3L3SS » Fri Jun 01, 2012 2:16 pm

Good thing you yelled everything at the camera.
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Post by Dranz » Fri Jun 01, 2012 9:58 pm

RobsProjectSOHC wrote:Seller is good, received it yesterday but I worked all night. Well here it is.
Down pipe too? Or just header. Depending on how good they welded the pipes to the flange, you should take a quick dremel to those pipes in the ports. Smoother transition, less turbulence, another .5% hp gain.

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Post by RobsProjectSOHC » Fri Jun 01, 2012 11:59 pm

I'm going to do some porting for sure...honeslt didn't look 1.75".....more 1.5"

And down pipe is top picture to the left. Looks good, excited.

Watching vid now
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Post by Dranz » Sat Jun 02, 2012 6:40 pm

Sorry, meant to ask if you are putting the dp in also. I see the dp in pic.


EDIT: You are putting in a high flow cat.

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Post by Donkeypuncher » Tue Jun 05, 2012 5:35 am

The OBX looks pretty much the same aside from the O2 bung on the downpipe and the 2 extra welds.

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Image


I may just keep my lth and get a resonator/glasspack to get rid of the rasp at certain rpms. Problem is I only have 25" of midpipe to work with due to the high flow cat, not sure if that's enough room.

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Post by Dranz » Tue Jun 05, 2012 7:26 am

A way to solve your limited space lengthwise is to step up one size in diameter for the glass pack. If you are running 2.25" throw a 2.5" glass pack at it. It usually gives you a thicker mat of glass to absorb the sound. This is only true if the outside diameter of the shell is larger, so pay attention when buying. On my 2.4 first gen, I was running a lth, high flow Catco cat, and a 28" thrush glasspack to side exit(all 2.5")and it sounded f'n mean. Just enough rasp to sound scrappy, but deep enough to intimidate with the rumble.

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Post by Donkeypuncher » Wed Jun 06, 2012 6:23 am

I am running a muffler so a shorter one just might work, going 2.5" is probably a good idea. I don't mind it being loud, it's just the rasp at full throttle that bothers me. I'm not sure if swapping to the shorty would help any, but a glass pack is definitely way less trouble.

I'd like it to have a deeper note like it did with the stock cat and manifold. Made a video a while back to show the problem: http://www.youtube.com/watch?v=kUAK7OaMh6M

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Post by RobsProjectSOHC » Wed Jun 06, 2012 12:54 pm

Donkeypuncher wrote:The OBX looks pretty much the same aside from the O2 bung on the downpipe and the 2 extra welds.
It looks very similar, but I can tell they took there time on that to polish it up on the inside. Mine, they just threw it together it looked like.

So, with that knowledge....my friends is going to let me borrow a dremel tool to do some port and polishing. After this, then installing.

(p.s. - this section should be stickied for the ebay headers proving to not suck for temporary parts. lol)
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