[Shotimes] Modded SHOs & useless powerbands WAS: OT GTP's
- was squeak in left side of dash
Mark Nunnally
manunnal@netheaven.com
Wed, 12 Nov 2003 19:20:40 -0500
The idea is to make as much torque as possible in the rpm range where you
run the motor. For a street car, this is idle to 5k or so.
With an n/a motor, there are only so many ways to pick up the whole torque
curve. cubes, compression, etc. For bolt ons, ypipe/exhaust and UDP's do
the same.
When you start throwing in wild cams, etc...and shifting the torque curve to
higher rpm, you are saddled with a fairly heavy car and no torque till you
get the revs up, which gets old with a street car.
The 3.2L in my 89 is a great street/drag strip motor for a SHO. Stock cams,
stock intake, 3.2L, etc...lots of grunt down low. Doesn't turn great mph
due to the peak hp limit of the cams/intake (max of 99-100 mph) but ET's as
low as high 13's, 14.0-14.1 even with lousy air/heat such as we had at the
convention. However, the more I open track the car and tweak it out to be a
pretty good "momentum" car (not really a straight-away blazer), the more I
get more frustrated with the powerband. With the car's weight/balance and
tire/wheel package, I can't pretty much keep the motor wound up at most
tracks. So basically I'm operating in the rpm range where the torque is
falling off (from 5k to rev limit). This is why over winter I plan to build
a new motor that will make more torque in the rpm range where that car needs
it. Plan to run a little "wilder" cam profile. EH intake with BBB's, 92.5mm
bores with forged pistons, and to help offset any loss of low end, will be
bumping the compression to 11:1. This should make for a ~300 hp motor and
still have some decent low end grunt if needed. We'll see if I can sneak by
on 93/94 pump with a modified spark curve, still though, even with all that,
the old stock cam'd 3.2L from the 89 will work better in the 92 than the
"300 hp" one would. It's all where you want to make torque, and for a full
weight street SHO, from idle to 5k is a better option. For the lighter 89
that's going to be wound up all the time, it needs more torque from 5k to
fuel cut off. Forget about the bench racing hp numbers, the new motor
should make probably peak 30-40 ft/lbs more in the 5.5k-7k range, which is
where it needs it, and will make it much quicker down the straights.
mark
----- Original Message -----
From: "Neno Albert" <neno@sbcglobal.net>
To: "Ron Porter" <ronporter@prodigy.net>; "'TaurusSHO'"
<shotimes@autox.team.net>
Sent: Wednesday, November 12, 2003 6:33 PM
Subject: [Shotimes] Modded SHOs & useless powerbands WAS: OT GTP's - was
squeak in left side of dash
> I agree, this includes SHOs with the Stage XVIII bolt-on package along
with those nifty little
> torque limiters SHO Shop sells.... :-D Seriously though, the lack of
torque makes most of the
> power unusable, esp. with most the power in the higher RPMS, you ain't
gonna get anywhere fast if
> you're on that excessively LONG band of no HP or TQ (lower RPMS). I'd also
like to bring up a very
> important fact. Not many road race their SHOs. Not many go to drags to
race their SHOs either (and
> if they do, most of them don't crack into the 13's) with MANY mods. I've
seen SHOs w/ full
> bolt-ons run 14.5s and bone stock SHOs (Ryan Pasch) run 14.5s on a BONE
STOCK Gen 2 MTX SHO! I'd
> say stick with the OEM power and get yourself use to what you have (by
legally pushing yourself
> and the car to you best) and then mod it up. SHOs are sensitive enough
stock, let alone modded.
>
> I just realized how far-off this is from a squeak on the side of the dash,
so i changed the
> subject.
>
> Neno
>
> --- Ron Porter <ronporter@prodigy.net> wrote:
> > Because the overwhelming majority of 300+ HP SHOs are not n/a cars.
> >
> > And, in the few cases of near-300 HP n/a SHOs, I have heard first hand
that
> > they are "fast", but they aren't "quick" (as in.......crap for torque).
> >
> > Ron Porter
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