CrossfireForum - The Chrysler Crossfire and SRT6 Resource - View Single Post - 181-Pulley Fact, Fiction or Matter of Opinion?

May 23, 2008 | 06:44 AM

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SRT6 Gang Member

THREE 6S

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From: From North TX..To SoCAL..Now Cnt Philly

Re: 181-Pulley Fact, Fiction or Matter of Opinion?

[quote]When you are taking your a/f ratio reading directly off the factory o2 this is normal. The factory oxygen sensor constantly looks at the rich/lean condition and tries to keep it in a range that optimizes fuel economy. and detect any abnormalities( switching as much as 100 times a minute from rich to lean). The only way to solve the problem is to get a seperate wideband o2/ Or consider it normal during daily use. It only matters under sustained wide open throttle periods, as this is the only time that power is made anyway and engine parts can get hurt. Running lean at idle and cruise is just conserving gasoline. The object is to make precise power under WOT only and conserve fuel otherwise. And a custom tune would take care of the problem of running too rich under WOT. Hope this helps. [quote]
MD SRT6,
You are 100 % correct Sir

! I sought some feedback about those readings yesterday and was provided information echoing your comments. Everything is operating as it should and I am considering it normal until deciding on a WB O2.

[quote]As far as your vacuum/boost readings go it looks like you might have a small boost leak. Did you remove the intake manifolds ever? Most cars(all that I've owned) read around -16 to -18 at idle and during cruising.....................and the MOST boost I have ever seen with my 185 pulley is 18.9psi(which happened only once) to date.[quote]
Moparrbust,
The driverside mainfold was removed and tapped. I will go back and verify everything is sealed, as it should be. Is this the only place a boost leak could occur?

Any one really know the stock boost level? If I should be seeing a boost level of 18 psi, then would Moparrbust have a leak if he were producing 18.9 with a 185 pulley

[quote]
Intake, Pulley, Tune, Cooling

This is the mod path we all seem to be going - and then asking the question in between mods - does it really work?

Mod #1 - Should be cooling the IAT's to the MAX before anything else (bigger HE, pump, separate coolant sources, heat wrap, etc..)

Mod #2 - Preparing the engine to flow more boost (Intake & perhaps headers?)

Mod #3 - Adding more boost (Pulley)

Mod # 4 - Tuning this combination up (ECU)

I didn't follow this route - I went 2,3,4,1

I truly feel that once you tame the IAT's - the performance gains from the other 3 mods (all which will increase the IAT's and will affect your timing) will not be lost on you......

The bigger you do each one, the bigger the performance gains you will see.....

But if you don't address the IAT first...

I feel an IAT gauge is more important then an A/F ratio gauge - unless you are going to tweak the ECU settings continually. You can actually do something about the IAT's.....if you have the right setup. [qoute]
BB
Being new to the moding scene and I know I’m not only new member upgrading. You guys have knowledge that this newbie and other newbies are seeking, which is the reason for my threads

. I’m getting baseline numbers and information for each mod, to better understand cause and affect. Completely maximizing performance is not my intent because track visits and dyno runs will stop after the ECU tune. I understand heat soak/ IAT temps are performance killers but under daily driving conditions they mean nothing.

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