7 replies to this topic

[bubulle]

Hello

Was there a limit fixed to the NASCAR engines rpm? I read somewherere they cannot go beyond 9500 rpm while in the past they went beyond 10000... If so, when was that limit put in force? and what was the drop in horsepower?

[desmo]

Good luck with finding that out definitively. The NASCAR Winston/Nextel Cup rulebook is tiptop secret. Anyone leaking even verbatim excerpts without permission is subject to presumably draconian penalties.

[Engineguy]

If I'm not mistaken, there was not an actual RPM limit imposed (i.e. electronic rev limiter). Instead final drive gear ratio rules were put in place that indirectly limit RPM, and therefore horsepower. On a long (~constant RPM) track a tall gear makes the car hit the aero wall at a lower RPM, and since the HP is lower at that RPM, the aero wall is lower too. On short tracks a tall gear reduces acceleration rate... I presume they run out of straightaway before the RPM gets above the target.

[McGuire]

Originally posted by desmo
Good luck with finding that out definitively. The NASCAR Winston/Nextel Cup rulebook is tiptop secret. Anyone leaking even verbatim excerpts without permission is subject to presumably draconian penalties.

LOL still Hating on NASCAR I see.

Actually there is no rpm limit per se. Just as Engineguy noted, gear ratios (3rd, 4th and final) are mandated for the event to limit rpm to roughly the 9400-9500 range. Since obviously the ratios required to do that will change from track to track and even spring to fall, there is no point spec'ing them out in the rulebook as it would instantly go out of date. This deal began going on two years ago as I recall and is now in use at every non-plate track.

So how it works: when the team recieves its entry invoice fax for the event the gear ratios for that event will be specified right on the tech sheet, right along with the tire etc. (And a bunch of other useful stuff like what time the trucks are allowed on the property etc.) There is no mystery or conspiracy involved LOL and everyone gets their info at the same time. Except for you of course, but you are just a Hater so who cares.

[Bill Sherwood]

Originally posted by desmo
Good luck with finding that out definitively. The NASCAR Winston/Nextel Cup rulebook is tiptop secret. Anyone leaking even verbatim excerpts without permission is subject to presumably draconian penalties.

Fascinating!
So how do we get one?

[desmo]

Originally posted by McGuire
There is indeed a NASCAR Nextel Cup rulebook, just as for every NASCAR series. It is distributed to all competitors each year and made available to vendors, media and other interested parties upon request. Also, all revisions are faxed out to the teams and posted on a board on the side of the NASCAR hauler at each event. All the competitors know exactly what the rules are at all times.

Just ask for one, according to McGuire. You're an interested party, right?

You will be found insufficiently "interested" bv NASCAR, unless you are an insider.

[McGuire]

Originally posted by desmo


Just ask for one, according to McGuire. You're an interested party, right?

You will be found insufficiently "interested" bv NASCAR, unless you are an insider.

Well, you are not going to get one UNLESS you ask. Grousing about not having one won't help LOL.

[Ross Stonefeld]

Hmm, this ratio fixing is a new development you say? So no more onboards of Ryan Newman trying to take a Penske to 10,000 at Pocono?