John-
Is the F&B "Stage 1" the billet TB, or a ported stocker? If it is the
billet, then Bruce may have developed a workaround for your problem (which
sounds exactly like the problem I had -- lost power, a rich condition, and
getting pissed off at the dyno).
I'm awaiting arrival of the custom "gizmo" as we speak.
Grady Ogburn
'98 Sport CC 4x4
5.2l, 5 Speed
Mesa Headers & Cat
K&N FIPK, JET PCM
Gibson/MagnaFlow "FrankenPipe" Exhaust
Leer Topper
----- Original Message -----
From: "John Neff" <jndneff@texas.net>
To: "Dakota Mailing List" <dakota-truck@buffnet.net>; "DiRT"
<dirt@4x4wire.com>
Sent: Sunday, November 19, 2000 8:54 AM
Subject: DML: Dyno Pull
> I took my Dak to Colvin Automotive in Austin yesterday for it's first ever
> dyno run. I'm sure like most I had high hopes that I would be pleasantly
> surprised, but had a feeling I would be slightly let down. To say that I
> ended up being highly disappointed would be the understatement of the
year.
> As a recap, this is my Dak's current configuration and mods.
>
> 98 CC 4X4. 5.2L, Auto
> Intense Performance intake tube with K&N cone filter
> F&B stage 1 TB
> Mopar computer
> Mopar headers
> MSD 6A with stock coil
> Gibson cat back
>
> Stock, published, numbers are 235 HP and 300 ft. lbs. TQ. These are at the
> flywheel. I pulled 189.5 HP at 4400 RPM and 254.5 ft. lbs. at 3600 RPM. My
> weather correction factor is 1.0. So, no loss from adverse weather.
> Calculate back the 25% loss for the drive train and I end up with 252.67
HP
> and 339.33 TQ at the flywheel. That's a gain of 17.67 HP and 39.33 TQ.
>
> Lucky for me, the guys on the dyno were just as curious about all this as
I
> was, but noted that my torque started to fall off a bit too early for me
to
> make any kind of serious high end HP. After 3600, the TQ just slides off.
> Because they were curious and had nothing better to do, they hooked up the
> air/fuel meter (tail pipe sniffer) and gave me a couple of free pulls. The
> end result? I'm going off the scale on the rich end at WOT. They wanted to
> see about 12:1, but instead I went below 9:1. They suggested I either get
> more air into the engine, or cut back on the fuel. Since we all know that
> you need fuel to make power, I'd rather just get the air flow where it
needs
> to be. BTW, we made a pull without the air filter, and it make zero
> difference.
>
> Looks like it's time to start saving for an MPI manifold, and a Hughes
cam.
> I'm also thinking about having Bruce open up my old stock TB to 52mm and
see
> what that does for me.
>
> Oh, one other thing, the dyno confirmed a suspicion I've had for a long
> time. There is a noticeable flat spot in TQ from 2200-2800 RPM. At 2800,
it
> jumps then almost plateaus to 3600 where is starts to slowly drop off.
That
> would explain the lunge I feel the truck make just before 3000.
>
> John
>
>
>
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