I guess that I do have as much expereince tunning a SC as the next car nut.
Your A/F ratio needs to be around 12 to 1 using stock pistons, a little
richer is o.k. leaner is bad. Normally 14.7 to1 is what a N/A truck will
run cruising around, drops to around 13.9 to 1 at WOT for a little more
power. The fuel pump upgrade is there so the engine won't run out of fuel
at high boost and of course the FMU is there to increase the pressure. I
personally don't like the FMU method becuase the computer will, over time,
adjust for the increase fuel pressure.
I wouldn't drive the truck, much, without proper tunning. Many, many people
have destroyed engines running improperly tuned forced induced vehicles.
O2s readings are not an accuate reading of the A/F at readings richer than
13 to 1, so its important that you get to a dyno with a 'sniffer' OR really
trust Leach in his guestimates..
----- Original Message -----
From: "Shawn Bowen" <Shawn@bowen.com>
To: <dakota-truck@buffnet.net>
Sent: Friday, June 22, 2001 2:44 PM
Subject: DML: Superchargers on, WhooooHoooo Q&A
> Well, went to a friends house expecting to just hang out. We installed my
> PowerDyne while hanging out!!! We skipped the FMU and Fuel pump for now
as
> I have 24# injectors and an A/F meter that I can keep an I on. I'm
running
> the stock 6 Pounder, MAN what a difference. The A/F is STILL RICH at
WOT!!!
> Maybe you folks can guide me here with a few minor issues:
>
> 1) Originally I had sent my PCM to Leach for a blower flash, it's been
> running rich as shit waiting on the blower. Now, WITHOUT the Extra Fuel
> Pump and FMU I am STILL rich at WOT!!! Go figure. This is with the 6#
> pulley, I would expect to lean out a little with the 9#er I'm going to put
> on after break in. My biggest headache is that after the flash and before
> the SC at WOT I would stop at 4600-4700RPMS. When I say stop, it's not a
> rev limiter, rather I didn't think their was enough air to blow the fuel.
> So now, SC on at WOT I BLAST past 4600RPM's to 5300ish and then it WILL
NOT
> SHIFT until I slightly let off the throttle, WTF???? When I do let off
> slightly BAM I'm through the RPM's in a flash and have to back off again
> slightly to shift again. Any Ideas??? I'm thinking that the shift points
> are slightly higher and the 6#er isn't feeding enough air to pound through
> them. HMMMMM. Suggestions welcome!!!
> 2) Next, I haven't installed a boost gauge yet, and I'm running the
factory
> PowerDyne Air filter in the fender well. That puppy is WAY undersized for
> this kind of air movement. I plan on moving back to my old 6x9 K&N as
soon
> as I find a reasonable place to put it, Any suggestions here??? I thought
> about the same place as the cold air setup, however this beast chews up a
> lot of real estate as it is, I'm concerned that if I put the K&N there the
> belt on the SC will rub.
> 3) I have an IAT adjuster but it does not seem to help any. I can not get
> it to lean out at WOT, I need dyno time to get everything right, but I'm
> waiting on gauges, K&N filter placement, 9# pulley, and what not first.
>
> Why oh why will my damn truck not shift on it's own??? Not enough air to
> blow through???
>
> Next steps are the original 6x9 K&N filter is going back on, and I'm also
> installing a test blow by valve for Bernd (not installed yet but it will
be,
> thanks buddy). I may play with the FMU and new fuel pump but at the
moment,
> unless the group speaks otherwise, I'm running rich at WOT, why put even
> MORE fuel into it??? I've got to tighten down the header y-pipes, AGAIN.
I
> also HAVE to get my gauges in, I have the A/F hooked up and running but
it's
> rapped around my 4WD lever;-)... Here's the mods so far just for any
folks
> perusing looking to provide input:
>
> 98 5.2L 4x4 CC Auto
> 52mm Flow Metric's TB
> Cold Air Intake
> DynoMax dual Catback
> JBA Ceramic Headers
> PowerDyne @ 6PSI (Everything but FMU and Fuel pump done!!!)
> Custom Pop off (Air release) for the Supercharger (Here but needs to
> be installed and documented)
> Custom PCM Blower Flash
> 24# SVO matched Injectors
> 1.7 Crower RR's
> Mopar Valve Covers
> Mopar Chromoly Pushrods
> Mopar Heavy Duty Springs/Retainers
> Autolite 3923's (soon to be 3922's)
> MSD6BTM (On the back burner, still deciding)
> MSD SS Coil (Here but not installed yet)
> MSD 8.5mm Wires
> Electric Fan (Ditched the Clutch Fan)
> Bernd's IAT Adjuster
> 4.10 Front/Rear Diff's (Ordered)
> Auburn Suregrip (Ordered)
>
>
> Thanks for any and all help/advice!!!!
> Shawn
> I got Blown tonight;-)
>
>
This archive was generated by hypermail 2b29 : Fri Jun 20 2003 - 12:01:51 EDT