So, do we have to call or is it being done automatically?

 

Well I didn't recieve any either, it also sucks that we have to do this ourselfs, but why do they need to be after the cat when they aren't located in that position stock?

 

I was curious as to this myself. Apparently, it's something to do with the readings being slightly different to the O2 sensors. Also the fact that for some reason, moving them behind the cat will not throw a cel.

 

Did you get this info about the bungs with your headers? I didn't recieve any type of instructions on what proceedures to follow as far as welding in the extra bungs. I'm also assuming that a test pipe will now trip the CEL. Crapola...

 

With all of the headers that are out this car you need to do something to tell the ecu data it wants to see from the o2's and there are no precats any more.

With Stillen it's the little black box.
With Cattman & HotShot it's extending the wires and mounting the the 2 o2's in question behind the main cat to fool the ecu into thinking the precats are still there.

The reason you have to do this yourself is the only other way is for HotShot to include a B-pipe with the headers that have the bungs already in them, which would drive the price up and probably cause many other problems like fitment and different mufflers.

 

[QUOTE=Y2KSESteve]Yes, HotShot is sending out the missing bungs to everybody that ordered a header.[/QU I second that, but they aren't stainless. For those who have stainless steel cat back systems, like myself I ordered ss bungs off Ebay for $22 shipped. I don't want to compromise the ss piping on my car. I am already inconveinienced enough with already installing headers and riding around with ses light on and having have to go back to shop and spend more money to have these things drilled and welded in. We should get some sort of kick back. Dyno improvement so far has been from 197 to 214 and torque stayed the same at 220 on my auto. My car has been suffering from the TS reflash in which I lost 10 hp. Trying to get that settled.

 

Could the Stillin black box be used in conjunction with the HS headers? Could one even buy just the black box if they wanted to?

 

BTW I don't like the "black box" setup because the more I think about it I believe it will mess up the mixture in closed loop as the temps change and also as the fuel blends change. IMHO

As far as a test pipe goes you can give it a try at the track or when dyno'ing but I'd leave the main in the rest of the time for the reasons above as well as the codes that will be thrown.

 

After reading jerome johnon's previous post about the lack of the 2 bungs, I emailed Hotshot and got all the info.

 

This hit the nail on the head. The reason the second set of o2's is behind the cat is to check to make sure it's working properly , and not burned up. On Camaro's and Firebirds with the LS1 engine we have o2 simms that plug into the stock hookups for o2 sensors and give the computer the signal that the cats are still working properly. I believe the second set is useless in determining part or wot fuel management since it's merely checking to make sure the first set of o2 sensors is working, and the cat is working properly. The first set are all you need, and they need to be located in a good part of the exhaust flow to get an accurate reading. I know when some of the headers came out for the LS1 they had some problems with the o2 sensors not being far enough after the collector to take a good sample of all 4 cylinders on that header.
The black box idea sounds like the best route if you don't have a cat. If it's like an o2 simms it will give the computer the reading it needs and you won't throw a CEL.

 

ill be there on the 7th at MIR wtih my camera and some tools....im gonan steal everything you got

 

HotShot should do a little bit extra work as far as drawing up a diagram with instructions, i.e. as to where to weld the extra bungs, and enclose them when they ship them out. Maybe Steve can drop them a line about this. If they draw out a simple way to attack this issue, so the car doesn't throw a code or SES light, it will save customers tons of aggravation...My .02

Fernando.

 

I agree completely.

 

Anyone get the headers on or dyno?

 

I'm still waiting on Hotshot to send out the 2 02 sensor bungs. I will install and have it dynoed hopefully by next week.

Matt

 

You do have a Y-pipe dyno to compare it to right?

 

yes

 

sweet. Finally a set of somewhat longtube headers. Bout time someone designed them right. Any chance of these fitting on the 3.0?

 

The headers themselves should definately work, it's the y-pipe they'll have to change slightly to make it fit the 4th gen. Hopefully these things will make some good power and if they do, I hope Hotshot realizes there are a ton of 4th gen owners eager to buy.

 

Awesome!