this car has range 4 and 5 overrevs. this is a "don't buy".

unless there is documented bore scope and compression (and/or) leakdown testing within spec.

plenty of GT4s on this buyer's market. move along.

 

Bingo, d00d hit it on the head!

To phrase d00d's astute statement - The only way you get an over rev above range 2 is if you miss-shift. e.g. somebody wanted 4th gear and got 2nd gear.

Although it is providing data about the engine, the DME read out is most valuable info about the transmission. Here somebody has thrust all that power through the transmission and it has only been 2 engine hours since. These are precision balanced parts and a transmission that has been buzzed could be an expensive repair. If you drive it and the transmission is tough or balky, anything but buttery smooth, then you know it has damage.

In addition, I believe this car cannot be CPO'ed because of the DME read out, is it possible this happened under the dealers watch?

 

Yep

3 to 2 just before turn in if you shift too soon.

 

I feel like a Flock of Seagulls wrote a song about this car...

 

 

Can someone explain to me how one could get an overrev past redline in a GT4 other than from a premature downshift. I assume that a rev limiter cuts in to prevent this. I'm new to the Porsche world, having owned my GT4 for less than a year. BMW, where I have spent all of my last 20 years, has a rev limiter that prevents overrev issues. Does my GT4 not have a rev limiter thereby allowing me to destroy the engine if I care to do so.

Along this line, how could anyone with a PDK say in a GT3 ever get any overrev. I presume with a PDK the rev limiter will prevent an overrev on throttle and the PDK won't allow a premature downshift into a lower gear. Wouldn't every GT3 PDK have a perfect DME report? If not, why not?

 

I wasn't able to do it, but others have been able to get range 1 and 2 by bouncing off the rev limiter.
However, 3 through 6 are from an inappropriate downshift.

 

Then you are leaving a bunch of time on the table, if you care...

 

A rev limiter will cut fuel to keep you from revving too high via the throttle. Cutting the fuel means nothing if you are in 5th at 120mph and shift to 2nd. At that point you've made a mechanical connection and it's going to drive the engine to explode unless you get it back to neutral fast enough.

 

FWIW I would be fine with a car that has range 3 over revs (8200 - 8400). Range 4-5 I'd still consider but I'd want a compression test and some hours on the car since the last overrev. Low mile car with range 6 overrevs for sale at a discount is the perfect candidate for a 4.25l build

 

 

It's because I get my car serviced there! Last time I went in for an oil change and came out with a 4L. This time I went in just to get my exhaust swapped and right there on the shop table was a new shiny set of 4.25L components and the 4.25L car on the dyno. I'm trying to resist but I'm a sucker for forged things. I could just get my car serviced at the stealer to avoid the temptation but then I'd probably end up in a new GT car every 9 months like everyone else on RL......

 

 

I think it is extremely unlikely for this to happen, if at all. The experience I posted earlier in this thread showed me the 9A1 engine rev limiter does a pretty darn good job of preventing redline being exceeded during a missed shift. As the technician explained to me during the PPI for my car when I sold it, Range 1 and 2 ignitions do NOT indicate redline has been exceeded in the 9A1 engine 981 cars, it only indicates the rev limiter has activated. So, Range 1 and 2 "over revs" are not actually redline exceedances. I can't say with certainty that Range 3 ignitions are an indication of redline being exceeded, but Range 1 and 2 do not indicate redline exceedance in 9A1 engines in 981 cars.

What would happen if you planted your foot on the gas to the floor with the gearbox in neutral and starting with the engine at idle? If someone out there in internet land is curious enough to do that and risk their engine, please post video results here. When I missed the 2-3 upshift as I described earlier, the RPM was already in the 6500+ range, and the rev limiter had no problem catching the engine RPM to prevent Range 3 ignitions. I think there were something like 14 ignitions in Range 2 and a couple hundred in Range 1 shown on the VAL report.