superchargedZ

Topic?

My injectors are maxed 106% at 6100rpm...I wonder if I will be able to scale them down a bit after the LT's are installed.

Thanks Jason

Colonel

They didn't make mine run rich at all. Sure, the O2s read a little richer at WOT (O2 sensor placement, IMO) but the wideband verified that the mixture was 13.3:1. Hardly what I'd call rich. This was with a stock unported but descreened MAF and stock fuel programming. Also, the Ltrims really didn't change from the stock manifolds and cats to the LTs and no cats. Still right around zero like before.

Slowhawk

iTrader: (12)

Headers actually make your car leaner.Thus the computer over compensates and makes it run rich.

Colonel

That sounds good in theory but I certainly didn't see it happen in practice. I really don't think my WOT mixture was effected anything more than slightly by my header install. I believe this to have been the case both times I've added headers to a bolt-on car.

I think the PCM does a fine job of compensating for bolt-ons.

I think all of these folks who think they're running rich after header installs should hook to a wideband before assuming such. They might be surprised.

Slowhawk

iTrader: (12)

I made the remarks from what I've seen <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> 01 cars have a big A/F change with adding headers.My car went from 12.5-1 A/F to 10.8-1 at WOT (3500-6200rpm)on the dyno after adding headers and no tuning.This has happened to 3 cars I know of.A simple change with a MAFT base setting clears most of this up.When the computer adds fuel at idle and cruise(+ L-terms)The WOT throttle is added fuel too.This can be good if your car requires it,but most don't.

robertbartsch

...after a cold start with LT headers my car exhaust smells like raw fuel....


...after it warms a bit it seems to be OK


....a friend did an ATAP and told me it was not rich...

I hate headers too...

blkbeaZ28

iTrader: (4)

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by robertbartsch:
<strong> ...after a cold start with LT headers my car exhaust smells like raw fuel....


...after it warms a bit it seems to be OK


....a friend did an ATAP and told me it was not rich...

I hate headers too... </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">i agree after the few days after getting headers i reeked(spell check) of fuel, when i got my vehicle dynotuned i found out i was right at 13.0:1 which is in the norm i asked what gives with this stinch, Jayson replied with "all these babies stink with longtubes"

Turk01SS

After my LT install A-Tap was telling me I was running rich as well. When I got the car tuned at MTI it turns out I wasn't running rich at all. I think Colonel is right about the sensor placement on the pipes. Yer car is gonna smell if you don't run cat's.

superchargedZ

Thanks for all the replies...I am going to be running cats. I guess I will just need to go to the dyno and use a little LS1edit magic.

Jason <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

Slowhawk

iTrader: (12)

<img border="0" title="" alt="[Embarrassed]" src="gr_emb.gif" /> I was going at the tuning part <img border="0" title="" alt="[Embarrassed]" src="gr_emb.gif" /> The exhaust WILL smell rich after the header install.LS1 Edit will not help you with the rich smell.

Colonel

Ok, that's three of us who've widewand tested and saw NO rich condition after headers.

There is an explanation (not necessarily the same one in each case) why occasionally someone really sees a rich condition after headers.

How many times have I seen people go jacking with their MAF sensor outputs based on nothing else than it "smells pig rich now!" Welcome to the world of off-road headers. Get used to it! <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

superchargedZ

Even if I still run cats? That sucks...

Turk01SS

if you run cats it will smell like it does now. deleting cats is what makes it smell, or actually cats is what make the exhaust not smell so bad. Hence, its the law to have cats cause yer not polluting as bad. screw the law <img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

I8COBRA

iTrader: (56)

My AFR actually raised 2/10th, so it ran leaner after my FLP longtubes.