DTMiller

How much would it cost to vinyl wrap an empty enclosed trailer as a mobile dyno to park in the paddock?

hf1

After a few fake dyno weekends I think they'll start to figure it out. You have to sprinkle a few real ones in between.

MarcD147

just make an announcement on the Thursday before the race that there will be extended dyno testing during the weekend for front runners as well as random selections.
show up with said empty vinyl wrapped trailer


see who cancels last minute, doesn't show or leaves shortly after arrival and you know what you need to know

no need to do this many weekends...

multi21

Out west, the 944 Spec class is run in PCA, NASA and POC with a hp cap in the latter two series. Both NASA and POC use mobile dynos, but PCA does not. I agree with you however, that it probably won't happen in PCA

hf1

I'm puzzled and intrigued by this resigned attitude towards a PCA position that no one seems to be able to justify or explain. Very interesting.

Frank 993 C4S

Have you had a chance to read the latest Club Racing News as it has some articles on this issue? If you're going to the Monticello Race, I'd be happy to show you and demonstrate it in more detail.

The "black box" data program has been great in terms of identifying outliers and it allows PCA to check gearing and rev limits without the risk of blowing up engines on a dyno. Add bore and stroke checks and ECU flash compliance checks and engine and gearbox performance related issues are covered pretty well.

From my experience, there not only a wide discrepancy in terms of driver skill but also preparedness in PCA stock and spec classes. Some people change wheel bearings every 6 months and are fanatical about reducing rolling resistance and others could care less and run true junk yard motors.

hf1

How big is this risk? What are the statistics about engines blowing up on dynos?

Not denying there are other ways to discover issues. Just curious what the resistance to dynos is all about. Other race series don't seem to have a problem with it. I'm sure they are as concerned about their engines blowing up as anyone here.

I run a junkyard SPB motor. Are there any other motors out there?

987part

Junkyard motor vs a freshly built 25k motor?

Im sure theres a difference...

Car setup, alignment and driver skills make a difference too, a big one

Some friends with 944 have 20-30k engine...

Im sure spb is the same...

Streak

One thing to consider with respect to dynos etc are the cars that do not have cooling fans. Like most SPB's. I recall getting called into have my gears checked and they were having trouble getting the computer synced up or something and I finally had to tell them I couldn't run the car anymore and they agreed. Depending on when it's not a problem as long as it's efficiently done. Getting called to the scales right after a race can be an issue as well. We can't just let the car idle particularly when it's already hot. Just things to consider.

As a side note:

And pace laps or caution laps. At WG for some reason the pace car was crawling along. At some points we were under 20 mph and that was in sight of the pace car which means those farther back were probably stopping and starting. I almost had to just quit the race or overheat the motor. That should never be a decision I have to make. No reason for a pace car to go that slow. Of course when I brought this up to the stew I was basically called a liar and dismissed.

987part

^why not stop the engine while waiting for scale?

Big field behind the pace car...

Even in front 10 runners, some guys are leaving gap between each other.
I recalled that at every meeting, the stewart ask us to stay grouped... some people are blind and stupid

hf1

So now I need a $25k motor to compete in SPB? Wish someone told me this before.

Some mechanics say that a good used motor is often better (more run-in) than a freshly built legal motor.

Streak

We do but there's not much time between stops and starts to cool it down.

Bigger the field the faster the pace car should go. It was mandated 35 mph. Not sure if that's new or not but it was the first time I recall going that slow. In some spots we got down to 14 mph. Too slow for a hot car with no fans.

987part

I dont think u do,

But when u look at front runners, its all shop owners... im not insinuating anything, but they have the magic sauce thats for sure...

Streak

Veloce Raptor

Often times the pace car driver is some club volunteer who may or may not have ever been on a track before. They may be terrified at anything beyond 30 mph. I have raised this issue before especially in race groups that run full slicks