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Search: Posts Made By: RaceProEngineer
Forum: Porsche Autocross and Track Racing 04-10-2013, 02:56 PM
Replies: 11
Views: 959
Posted By RaceProEngineer
Thank you, one and all, for the recommendations...

Thank you, one and all, for the recommendations and help. It appears that we have found exactly what we were after! (We appreciate it, Doug.) And, thanks to this wonderful Forum for putting us...
Forum: Porsche Autocross and Track Racing 01-28-2013, 08:01 PM
Replies: 14
Views: 895
Posted By RaceProEngineer
Hi John, Did your method have a way to...

Hi John,

Did your method have a way to reference the virtual front-to-rear center-line of the chassis? In other words, could you determine left toe measurements independent of right toe...
Forum: Porsche Autocross and Track Racing 01-28-2013, 04:00 PM
Replies: 14
Views: 895
Posted By RaceProEngineer
Matt, I would not necessarily assume that one of...

Matt, I would not necessarily assume that one of your measurement DEVICES was off. Probably one of the measurement PROCESSES was flawed.

It is very important NOT to allow tire sidewall to play...
Forum: Porsche Autocross and Track Racing 01-28-2013, 03:49 PM
Replies: 14
Views: 895
Posted By RaceProEngineer
You have MOST of the facts right. I would ammend...

You have MOST of the facts right. I would ammend your statement about laser-based systems, to read:
"Laser systems, IF they are set up very carefully, and operated properly, and results are...
Forum: Porsche Autocross and Track Racing 01-03-2013, 08:25 PM
Replies: 28
Views: 3,394
Posted By RaceProEngineer
Patrick, I am certain you already know this,...

Patrick,

I am certain you already know this, but you will need a TON of power to pull that thing through the air! And once you start adding dive-planes and wicker bills to the front end, top...
Forum: Porsche Autocross and Track Racing 01-03-2013, 07:47 PM
Replies: 17
Views: 1,059
Posted By RaceProEngineer
So, Matt, are we still discussing SCCA here? ...

So, Matt, are we still discussing SCCA here? There is a significant difference between "getting flack", and not passing annual tech. "Enforced"? Did the driver for whom you were crewing have to...
Forum: Porsche Autocross and Track Racing 01-02-2013, 04:35 PM
Replies: 17
Views: 1,059
Posted By RaceProEngineer
Matt, In practice, there is not a scrutiner...

Matt,

In practice, there is not a scrutiner in the country that enforces that to the letter! It is one of those SCCA "catch-alls" that give the tech inspectors additional ammunition if they need...
Forum: Porsche Autocross and Track Racing 01-01-2013, 10:15 PM
Replies: 28
Views: 3,394
Posted By RaceProEngineer
Hi again, Patrick, We have never built a 951...

Hi again, Patrick,

We have never built a 951 - perhaps the closest project being a very nice SCCA Corvette. There are many theories and hypothesis floating around regarding spring rates. We...
Forum: Porsche Autocross and Track Racing 01-01-2013, 10:03 AM
Replies: 28
Views: 3,394
Posted By RaceProEngineer
It is pretty simple (at least on paper!) If...

It is pretty simple (at least on paper!) If other competitors are using slicks, and you want to have a chance, then you need to figure out the suspension setup for both. To further complicate...
Forum: Porsche Autocross and Track Racing 01-01-2013, 09:49 AM
Replies: 28
Views: 3,394
Posted By RaceProEngineer
Checking in late here - sorry. Walt, ...

Checking in late here - sorry.

Walt,

With the highest amount of respect for all of your well-thought-out posts, there absolutely has to be more to this story.
? Setup not optimized for...
Forum: Porsche Autocross and Track Racing 12-06-2012, 04:09 AM
Replies: 20
Views: 1,856
Posted By RaceProEngineer
We have run hundreds of 911s over setup scales. ...

We have run hundreds of 911s over setup scales. (As I am certain you already know) 49/51 is not achievable without moving the motor into the back seat, and the driver into the smugglers' box.

Ed
Forum: Porsche Autocross and Track Racing 11-07-2012, 03:24 PM
Replies: 20
Views: 1,856
Posted By RaceProEngineer
Kent, Currently installed, do you have Boge,...

Kent,

Currently installed, do you have Boge, Bilstein, or Koni struts?

Ed
Forum: Porsche Autocross and Track Racing 11-06-2012, 05:55 PM
Replies: 20
Views: 1,856
Posted By RaceProEngineer
Kent, My reason for asking if this is a...

Kent,

My reason for asking if this is a racing (or autocross) application is that dual-purpose 911s are a big bag of compromises.

If you are still using this car on the streets, then I can...
Forum: Porsche Autocross and Track Racing 11-05-2012, 05:15 PM
Replies: 20
Views: 1,856
Posted By RaceProEngineer
Clarification . . .

Hi Kent,

We all appreciate your very concise question. I am afraid you will need to elaborate a little, or clarify, in order to get some response. Maybe something like this:

" For a given car...
Forum: Porsche Autocross and Track Racing 10-26-2012, 08:14 AM
Replies: 30
Views: 2,433
Posted By RaceProEngineer
Mike, Most of us will agree that you are...

Mike,

Most of us will agree that you are very smart in proceeding with any $5000 upgrade CAUTIOUSLY. While the consensus seems to be that the early G-50 second gear ratio is problematic, I stand...
Forum: Porsche Autocross and Track Racing 10-25-2012, 07:26 PM
Replies: 30
Views: 2,433
Posted By RaceProEngineer
Michael, If you have already made up your...

Michael,

If you have already made up your mind to make changes to the ratios, so be it.

Unfortuantely, I have no way of knowing your driving experience, or driving style, or much about your...
Forum: Porsche Autocross and Track Racing 10-24-2012, 12:55 PM
Replies: 10
Views: 618
Posted By RaceProEngineer
Now that sort of invites a philosophical...

Now that sort of invites a philosophical cause-and-effect discussion, doesn't it?
Forum: Porsche Autocross and Track Racing 10-06-2012, 07:56 PM
Replies: 5
Views: 387
Posted By RaceProEngineer
Hi Pål , Unless you have a direct input from...

Hi Pål ,

Unless you have a direct input from data logging that can be plotted against the precise matrix of weather/temperature/suspension settings/ECM settings/car weight/pyrometer readings, etc....
Forum: Porsche Autocross and Track Racing 10-03-2012, 12:56 PM
Replies: 15
Views: 1,145
Posted By RaceProEngineer
Obviously, they already have them! I do...

Obviously, they already have them! I do appreciate your clarification - I should have mentioned that myself.

Ed
Forum: Porsche Autocross and Track Racing 10-03-2012, 05:09 AM
Replies: 15
Views: 1,145
Posted By RaceProEngineer
Of course that is right, BUT -- We are working...

Of course that is right, BUT -- We are working here with a '73 RSR (assumed torsion bar) car.

Obviously, if we were discussing a prototype or formula car with variable length rocker-arms, or...
Forum: Porsche Autocross and Track Racing 10-02-2012, 08:29 PM
Replies: 15
Views: 1,145
Posted By RaceProEngineer
Careful, now, with terminology. Wheel Rate is a...

Careful, now, with terminology. Wheel Rate is a static calculation involving ACTUAL spring rate and motion ratio on a particular corner of the car. Simply increasing track does nothing to effect...
Forum: Porsche Autocross and Track Racing 09-11-2012, 03:16 PM
Replies: 22
Views: 1,452
Posted By RaceProEngineer
Not necessarily, Pete. For the action you...

Not necessarily, Pete. For the action you describe to occur, the CORNER in question would have to be OVERLOADED with 1000 pounds for the spring to extend a full inch, and that assumes zero rebound...
Forum: Porsche Autocross and Track Racing 09-11-2012, 11:35 AM
Replies: 22
Views: 1,452
Posted By RaceProEngineer
In simplest terms, that pretty well covers it. ...

In simplest terms, that pretty well covers it. The unfortunate part of the puzzle is this:

* You need to get the car onto that "uncomfortable" territory before you can "step back" from there one...
Forum: Porsche Autocross and Track Racing 09-11-2012, 11:18 AM
Replies: 22
Views: 1,452
Posted By RaceProEngineer
Hi Pål , It is very nice to be conversing...

Hi Pål ,

It is very nice to be conversing with you again also!

Like with anything, one can take suspension stiffness "too far"; but in reality, that theoretical "too far" is way, way, way out...
Forum: Porsche Autocross and Track Racing 09-10-2012, 06:46 PM
Replies: 22
Views: 1,452
Posted By RaceProEngineer
Yes. All other things being equal, including...

Yes.

All other things being equal, including a relatively smooth track, THE stiffer CAR will have greater capability for speed - but the driver may not.

GENERALLY, in the category of...
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