Hot Shot Headers - Page 3

PatScottAKA99XE · Oct 19th, 2002, 10:04 PM

Quote:

Confusing, isn't it?

**chimmike** · Oct 19th, 2002, 11:42 PM

there are many QG owners with headers that have not had to relocate their sensors......................

PatScottAKA99XE · Oct 20th, 2002, 10:29 AM

Quote:

Originally posted by chimmike
there are many QG owners with headers that have not had to relocate their sensors......................

Just wondering, what did they do with them?

**chimmike** · Oct 20th, 2002, 11:04 AM

put them in the secondary where the bungs are that HS welds in.

I am not even running the bottom 2 O2 sensors, lol. I'm having enough trouble getting them out of the stock manifold =)

PatScottAKA99XE · Oct 20th, 2002, 03:18 PM

Quote:

Originally posted by chimmike
put them in the secondary where the bungs are that HS welds in.

I am not even running the bottom 2 O2 sensors, lol. I'm having enough trouble getting them out of the stock manifold =)

You have 4 sensors and I thought the HS only had 2 fittings, hows that work?

e2001gxe · Oct 20th, 2002, 03:20 PM

Two are on the header itself and the other two are on the downpipe.

PatScottAKA99XE · Oct 20th, 2002, 03:27 PM

Quote:

Originally posted by e2001gxe
Two are on the header itself and the other two are on the downpipe.

Ok, thanks. Just to let you guys know.. If you put the 2 rear O2 sensors in the down pipe, its not gonna do any good. They need to be behind a cat or the ECU will think that something is wrong(Well, there is!)

The ECU is looking for this:
Front O2 sensors - raw ehxaust. The ECU can determine what adjustments need to be made to the a/f ratio by reading the raw exh.

Rear O2 sensors - cat cleaned exhaust. The ECU uses these O2s to tell if the cat is working right.

So you see if you put the rear O2 sensors in the down pipe the ECU will get a raw exhaust signal from them. This makes the ECU think that the cat is not working, and will set off the check engine light.

e2001gxe · Oct 20th, 2002, 05:12 PM

Quote:

Originally posted by PatScottAKA99XE

So you see if you put the rear O2 sensors in the down pipe the ECU will get a raw exhaust signal from them. This makes the ECU think that the cat is not working, and will set off the check engine light.

What does the ECU do in response? Does it make the A/F mixture rich or lean?

-Eric

PatScottAKA99XE · Oct 20th, 2002, 05:22 PM

Quote:

Originally posted by e2001gxe
What does the ECU do in response? Does it make the A/F mixture rich or lean?

-Eric

Nothing, it just turns on the check engine light. Rear O2 sensors have nothing to do with A/F ratios, they are only there to monitor cat efficency(sp).

e2001gxe · Oct 20th, 2002, 05:31 PM

Then I'm getting crappy gas milage for other reasons. =D Thanks for the reply.

**chimmike** · Oct 20th, 2002, 07:19 PM

Quote:

Originally posted by e2001gxe
Then I'm getting crappy gas milage for other reasons. =D Thanks for the reply.

I noticed that too. me=heavy foot

lol

e2001gxe · Oct 20th, 2002, 07:31 PM

Mike,

What's the range ur getting on 1 tank? Before mods and wheels I was averaging 360. Now (after header and 16's) I only get about 300-barely. That's like 33 before and 27-28 now. Quite a difference. Although my heavy foot is not too bad.

khemicol · Oct 25th, 2002, 09:24 PM

has anyone gotten really bad vibrations after the header install and the car driving like a pig???

My O2s are still on the secondary BTW.

Khem

Oct 26th, 2002, 01:23 AM

I had mean vibrations when my secondary bolts came loose, didnt drive like a pig but sounded terrible. I heard the heat sheild makes some harsh noise.

PatScottAKA99XE · Oct 26th, 2002, 01:36 AM

Wish I could have seen this before:
http://lion.esosoft.net/hotshot.com/headers/CEL.htm
In your guys case its 4 O2s intead of 2