Re: Software etc

[Tom Jennings <tomj@xxxxxxx>]

On Thu, 21 Jul 2005, Bruce Hevner wrote:

> ...
> I left the shop with the dyno before these programs came out so I cant
> comment on comparisons in real life. However I recently did some searching
> for any results users have had from the cam Im putting in the 390 Im
> building now (240@.050 solid Crower). I found 2 guys who HAD run 401Rs
> built very similar to my engine and who HAD compared Desktop Dyno to their
> actual dyno results!! BOTH said although the HP results were optimistic (a
> good 30HP to high) the torque was VERY accurate, within about 10 ft lbs.

Well that's good news for me then. Most of the time I'm just
trying to figure out how A compares to B, like working out how all
the 60's and 70's six cams compared to each other (I lost the damn
results! Sheesh!)

I did recently take DeskTop Dyno's advice though -- playing with
the AMC six, simply increasing exhaust and intake makes for a HUGE
improvement across the board -- no other changes except TFI
ignition. I can attest that going from the factory crap 1.75"
bend-contest-winner exhaust to a 2" straight as possible with
Summit muffler made a huge difference.  With the Weber 32/36 it's
subjectively as good as a stock 304. Plus mileage is pushing 21
mpg, 65-75 mph LA freeway. And it's probably lean one jet size
(still tweaking). And this winter I'll start collecting stuff for
Megasquirt TBI.


> Thats one of the main differences in the programs, the INPUT. The more
> expensive programs require actual flow readings at different lift points.
> These programs get the results more accurate than DD,,, but they also cost
> more.

> Take a look at SEngine AnalyzerT from performance trends and youll see
> what
I'll go look, but I'll probably stick to DD. Maybe I should buy
a later version though! Mine's 2.7something, probably from 1998.