brendon

I put this cam in and am planning on getting headers real soon. How much does this cam benifit from headers? I assume that some cam grinds will benifit more from a good exhaust than other? And also, would not having headers explain an extremely LEAN condition after the cam install? I have my MAFT base set at 15% rich (3 clicks)and the WOT at (2 clicks) 4%?

RUF SS

Well, jmx with a 218/224 cam with ported heads got in the 360 rwhp range with no headers and exhaust. After headers, the car went in 380 rwhp range.
On TR websight they dynoed the 224/224 112 with stock heads and FLP longtubes + bolton's got 398 rwhp.
So, I THINK with the 224/224 you would see at least 20-30 rwhp gain with long tube headers.

Raughammer

[quote]Originally posted by RUF SS:
<strong>So, I THINK with the 224/224 you would see at least 20-30 rwhp gain with long tube headers.</strong><hr></blockquote>


I would concur.

I cannot see how NOT having headers would result in a lean condition. I have seen adding headers to a car lean it out. Not the other way around.

Laters...

Nickn20

headers will lean a car out, basically it will let the motor proccess more air, through the motor and thus through the maf.

RPM WS6

iTrader: (3)

We put SLP LTs (off-road pipes) on a friends ’00 M6 Z28. I had a-tap that car many times before the header install and his O2s were always in the .890 to .900 range at WOT (basically perfect). After the header install the O2s were always .940 to .950 (WOT). So the headers made the car quite a bit richer. Eventually, we put maf ends on and got the O2s down to .910 to .915, which is still rich, but much better than .950.

The car has had stock tuning and a stock cam thru all of this.

I guess every car is different? <img src="images/icons/confused.gif" border="0">

[ January 09, 2002: Message edited by: RPM WS6 ]</p>

MyLS1Hauls

iTrader: (2)

When we added headers to my buddies car, it also had O2 readings in the higher 900s. I dont know why some run rich with headers. I've seen many on here state that their cars ran more rich after headers.

Brad

brendon

I have always heard people say that anything done before the motor will tend to lean you out and anything done afterward will richen you up ie. headers. I am not saying that I am rightn because I don't have any yet, but that is what I normally hear. <img src="images/icons/confused.gif" border="0"> For example when i went with offroad pipes and removed my cats I was running richer than with the stock cats accroding to atap.

[ January 09, 2002: Message edited by: brendon ]</p>

Playdough

[quote]Originally posted by brendon:
<strong>I have always heard people say that anything done before the motor will tend to lean you out and anything done afterward will richen you up ie. headers. I am not saying that I am rightn because I don't have any yet, but that is what I normally hear. <img src="images/icons/confused.gif" border="0"> For example when i went with offroad pipes and removed my cats I was running richer than with the stock cats accroding to atap.

[ January 09, 2002: Message edited by: brendon ]</strong><hr></blockquote>

I'v heard the same thing many times. Could this be that the motor is now free to breath and that the air is coming in faster because air is going out faster so the Mass-Air is reading more air coming in when its really not? And this in turn would make the computer throw more fuel in the chamber making the car run rich? Just a theroy with no proven facts to back it up.

John B

iTrader: (10)

You guys are missing Raughammer's point. Headers do cause a motor to have a leaner condition due to reduced backpressure....always!

What happens on an EFI motor like the LS1 is that when you add headers, the motor begins to run leaner at idle and part throttle. The PCM recognizes this leaner condition at part throttle and when you go to WOT, the PCM says, hey.....I am running lean at part throttle, therefore at WOT I better add more fuel to compensate for this and hence your LTFT's typically will shoot way up and now instead of having your O2's in the .890-.910 range with zero LTFT's the O2's will register being richer now because the PCM has consciously added more fuel via the LTFT's to the WOT to prevent detonation! Technically what happens is that the PCM reads the fuel maps & timing tables for the throttle position and engine load and decides that for the current condition that the motor must be under a larger load than it really is because of the lean condition and will read the last freeze frames from the O2's and make a one time correction for WOT.

Now doesn't this make sense why your car thinks it needs to be richer with headers? And it will be richer at WOT because of this so technically speaking maybe you could say headers cause your car to run rich, but not for the reason that you think!