997gt3north

- car is at the dealer and the dealer tried to connect to the dme and said that only type 1 info was there

- is this normal?

- i remember someone on this board a while ago memtioning something about this

roberga

all should be there, do you know if you have 2 and> revs?

997gt3north

They say I only have type 1 and since I track it would seem not likely to be true

I do remember someone else mentioning something about this

am722

Pretty sure that if all you are doing is bouncing off the limiter then you won't get anything higher than type 1 or 2 overrevs (maybe not even 2). The higher overrevs can only be achieved through missed downshifts.

P.J.S.

as I know it rev limiter bumps are type ones

rev limiter smashes -- aka money shift -- type twos

to the best of my knowledge

997gt3north

- I take the car to redline in every gear on the track unless I have to shortshift for some reason
- this is a guess, but I think i have hit the rev limiter maybe about twenty times (about half of those were the first trackday after I got the 4.0 r&p and i wasn't ready for how fast the revs climbed and the other half were on various tracks if i felt there was no point upshifting as i was just about to hit a braking zone (old gearing 4th gear into the bus stop at WG at about 147mph, etc.)
- I have never missed a shift (i was worried i would when i got the r&p - i.e. 5th to 2nd instead of 5th to 4th) but I actually i find the gearbox now easier
- so basically i have only gone likely max 200rpms above the rpm limit 20 times and the DME only shows type 1 revs (no type 2 or above)

paul

fc-racer

Hi Paul, the GT3 DME has rev ranges that show how many times you've cycled through each range. Here are the ranges:

Range 1: 9000-9200 RPM
Range 2: 9200-9400 RPM
Range 3: 9400-9600 RPM
Range 4: 9600-10000 RPM
Range 5: 10000-11000 RPM
Range 6: 11000 and up RPM

The only way to get into these ranges is to mis-shift. Hitting the rev-limiter will not get into the damaging rev ranges above. Btw, you can ask the dealer to print out the DME info for you, it's around 17 pages and has tons of interesting info if you're into that kind of stuff

997gt3north

Farz,

that makes sense
i will find out how many type 1s i have

997gt3north

Does this math make sense?

If my car has "400" cycles of Range 1 (9000 to 9200), then taking an average (9000+9200)/2 = 9100rpm - then 9200rpms/60 seconds = 151.6 cycles per second

Therefore, 400 cycles / 151.6 cycles per second = 2.6 seconds

i.e. the car has spent basically 2 1/2 seconds at 9100rpms?

If this is true, then i would think this is likely from my first day with the 4.0r&p when i accelerated from 2nd to 5th at Mosport and blew threw 2nd and 3rd on my first hot lap

make sense?

fc-racer

I believe the number that the DME produces is the # of ignitions in the ranges, not the revolutions in the ranges. I don't know the math to convert ignitions to revolutions, but I believe your time spent in that range would be very small given that the DME is showing only 400 ignitions.

am722

Right. There are 3 ignitions per revolution on a 4 stroke 6 cylinder engine. The 400 ignitions translate to 133 revolutions (close enough), so the math is actually 133/151.6, or a little less than .9 seconds of overrevs.

997gt3north

- thanks guys
- that makes a lot of sense
- on my very first hot lap with the 4.0 r&p (Oak Tree at VIR - i wrote turn 5b at Mosport above but i did VIR in early April) and I remember just blasting through the rev limiter coming out of the Oak tree in 2nd and then doing it again but not as badly on the 3rd to 4th shift so just less than 1 second sounds about right

- at that event, i also had a much more aggressive alignment (more front camber, less rear, front toe out) than I was using in the previous year, I also had the gt2 rear sway bar installed, the RS wing installed and my new 50/80 Paul Guard LSD so i was concentrating on way too many things and when I hit the Oak tree i just blew through the limiter
- i think at that point i was still smiling at how much better the car was turning through the lower esses than the previous year (better alignment and LSD) and how i could feel the wing at 10 degress plus the alignment working its magic in the uphill esses

paul

RonCT

From what I've read and been told by my dealer and shop, range 1 and 2 are fine and you absolutely will get there just by bumping off the rev limiter. Think about the inertia of the parts - by the time the limiter shuts you down, things are probably quickly ramping up. Range 3+ could be trouble, especially if looking for warranty coverage for something engine-internal related. There's also an on/off indicator somewhere in the DME dump (I have mine, but never found it - something like 20 pages) that lets the factory know if you hit some crazy number like 11500 or so. As you work up from 3 to 6 you go from possible to probable internal damage. When I picked up my GT3 I had the DME read and there were zero over-revs. I'm looking at a 2005 Boxster S now for family use (me, kids for DE, wife for around town) and one CPO I came close to had range 1-4 over revs...

sharkster

Exactly spot on and I'm dead impressed you know this! The GT3 ecu stores things a little differently to the TT and S'....

gota911

Alex,

The 997 (non GT3) Range 1 starts at 7,300 RPM and moves up from there. This makes sense to me because the red line is at 7,200 RPM.

My question is: why is there a 600 RPM gap between the GT3 red line of 8,400 versus the low end of Range 1 at 9,000? Is the 997 GT3 red line at 8,400?

Thanks