On Mon, 5 Oct 1998, Bridges, Bruce wrote:
> DML,
> I tried out the 700+cfm Holloway stage II throttle body at the track
> Saturday. Got some interesting results. The conditions: 75deg F, 70%
> humidity, 29.99 Atmospheric pressure.
>
> Run2, Stage 1 TB:
> R/T .833
> 60ft: 2.216
> 330ft: 6.282
> 1/8ET: 9.684
> 1/8mph: 71.74
> 1/4 ET: 15.209
> Mph 89.72
Just FYI: I ran your best time through a "correct to standard" formula
and came out with a 15.07@90.6.
(http://sura1.jlab.org/~bowling/etmphcorr.html)
2.21 seems like a pretty good 60' time for an automatic. That's about the
same as I get with my 5 speed!
[...]
> The Stage II
> TB presents some mysteries/opportunities. On the track, it felt "softer" in
> the mid range but pulled hard to redline after about 2500rpms. I had a
> significant problem with traction with the stage II TB as well but not with
> the stage I BUT my 60ft times (2.216 stageI vs. 2.213 stageII are
> equivalent! More grunt at the botom from the bigger TB, go figure?). Its
> hard to tell about the traction problem since the track had "aged" over the
> afternoon and probably had gotten more slippery since the first run. I
> didnt see the 14s I was hoping for, nor huge improvements from the big TB...
> BUT On the drive home, I noticed a definite surge at WOT at freeway+ speeds.
> I continued driving putting about 2 more drivecycles on the truck. At that
> point I felt that I am getting to 90mph from 65 mph faster than ever, but
> after "extended" WOT at 3K + rpm I get the surge. This says to me that Im
> too lean at the top end. The R/T never surged with the stage I TB. Hmmm
> Frank suggested removing the JET chip to see if the WOT gets better. Ill do
> that this afternoon. Sounds like more mods are needed... New comp mapping?
> Bigger injectors? Ill keep the list posted on what those might be as we
> get further along in the development process... Any suggestions to make the
> big TB work?
> BKB
>
Hmmm, that's a little dissapointing. Definitely needs some more testing.
What do you mean by a surge at WOT? At WOT, the truck just sort've surges
on its own? Does it happen at any particular RPM, or anywhere above 3K?
Incidentally, I just ordered the EASE scan tool. It was shipped out on
the 1st, so I'm hoping to receive it either today or tomorrow. Anyway,
it will connect to my laptop and allow me to monitor the PCM including
air/fuel ratio, etc. etc. etc. Should be pretty cool. :-) Anyway, now
that I'll have a much better picture of what's going on inside the engine,
I'd be willing to get in on the initial testing of the stage II if it'll help
to get the bugs ironed out.
-Jon-
.--- stei0302@cs.fredonia.edu ----------------------------------------.
| Jon Steiger * AOPA, DoD, EAA, MP Race Team, NMA, SPA, USUA * RP-SEL |
| '96 Dodge Dakota v8 SLT CC (14.77@92.97), '96 Kolb FireFly 447 |
`--------------------------- http://www.cs.fredonia.edu/~stei0302/ ---'
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