TB993tt

Stummel
RS Tuning did a 508hp engine for a street 993GT2 tested by Flat Six magazine (~1290kg) did the 100-200kph in 6.8s
Flat six also tested a Freisinger 600hp GT2 (Secan) and did 6.3s from memory.
I have some more data on those cars but not with me.

Jean

TB good memory, the Freisinger did it in 6.3 seconds, tested weight 3042 lbs. There is also the Chipeaux 993GT2 with 600HP and 2500lbs empty (GT2R car) that did it in 6.3 seconds, this one had modified gearbox though. I have a few more tests (Konrad GT2, Manthey GT2..) but no acceleration data unfortunately.

Stummel

no 60-130 but a GPS measured 100-200kph.

stock weight 4wd 993tt tuned by SHK with cams, some kind of k24, ecu, cat, mufflers. ECU setup is not finalized, so maybe there are still some tenths to be found.

3 runs from 7.5 - 7.7s.

any hp guess?

I still have to find out if it was a 1 or 2 shift run.
edit: 1 shift: 3rd and 4th with 7100 redline.

TB993tt

OK, 4WD re-installed, awesome traction and restored stability,
but major understeer
Did a quick 60-130 985mbar pressure 20degC (68degF) weight ~1510kg
My AX22 did not record for some reason, but here is the DB trace.
7.66s with 100 to 200kph in 6.74s
so lost abot 0.5s on the 60-130.
Incidentally the 60-140mph was 9.25s compared to around 8.75s in 2WD
The gearshifts are pretty crappy around the 0.5s mark.

Edit: I have been playing with the numbers, the average from 95mph to 117mph (all done in 1 gear, 4th) of 5 runs in 2WD on a 20degC day was 2.27s -the run below is 2.42s....

Jean

TB

Thanks for posting , I believe this makes a great comparison point between 4WD and 2WD.

I cannot recall the exact details of the previous runs, were you using your same "testing ground" as before, and was there any temp difference? Also, what was the comparable weight during the previous test?

It would be great to have an overlay of two runs (4WD vs 2WD) on the same road to see how lateral Gs change with the 4WD setup and why you feel it is more stable (which does not surprise me a bit). Also to have two runs on the same graph speed vs time

Thanks for sharing.

TB993tt

Tried a little run with the CGT using the Driftbox (no where for the AX's magnetic aerial to mount -without tape )
60-130mph in 7.82s with 100-200kph in 6.82s
Temp 69degF with full tank and no passenger.
It is difficult to say how good/bad the gear changes were since the way the DB displays the long Gs seems a bit at odds with the acceleration line (we saw this big time with the monster proto car) from the time the vehicle was not accelerating (red line) the changes look pretty good, but if one takes the gear change as when the long Gs start to drop then they look bad


Here is the same run but from 20mph up to 145mph. The TC light was flickering in second.
I compared the 60-139mph to the one I did with the 993tt 4WD two days ago -interestingly the tt was 9.25s and the CGT 9.28s (same amount of gear changes)

Jussi

That's true.
When you have constant speed like in first picture from 1.5s to 1.9s then G should be zero.
And between 5.0s and 5.2s when speed lowers then G should be <0
G can be positive only if speed rises..
This is because when these AX22 and similar devices publish 10hz or even 100hz sample rates they have added these extra samples in virtual with interpolate

Bill S.

Just picked up a Mercedes E63 AMG. It's an amazing car for a 4,000 lb 4-door sedan. 60 to 130 in 11.8 seconds. Great handling and shift response. I highly recommend it.

Jean

Nice car Bill, and very impressive numbers, congratulations.

I cannot see the shift that you are mentioning on the chart! Can you superimpose long Gs please.
Thanks

TB993tt

Bill
Thanks for sharing -I've tried that engine in an ML: superb

Bill S.

Hi Jean, believe it or not, that is the long Gs that's being displayed! Mercedes is proud of the nearly imperceptible shift feel in the new 7-speed AMG transmission. It's almost like a CVT. I'm not sure how they've accomplished it, but Mercedes has been building automatics and manumatics for a long time. I'm sure it's some ingenious mechanism. Their customers demand that kind of comfort, and now with AMG, can get performance also (BTW, AMG customers are, on the average, 5 years younger than their traditional customers. That's me! I'm not normally a fan of Mercedes vehicles, but needed 4 doors for my aging friends!).

I suspect the vehicle's momentum (mass * velocity) is also a contributing factor. That is, it takes a great deal of force (F = M*A) to noticeably change the acceleration of a vehicle with larger mass (4,000 lbs).

Bill S.

I've heard the 6.2 L is the first engine AMG built without using much Mercedes parts. At the AMG shows they're pretty proud of that engine. 20 MPH highway with 507 HP is not bad in a 4,000 lb car.

BTW, that's one of the reasons Porsche built the turbo car back in the 70s, to get good gas mileage and performance when gas was an issue (0-60 in 5 seconds? Watch out!!). Now turbo lag is an issue, and the new computer-controlled cars can overcome some of the economy/engine size trade-off. I suspect future Porsche cars will use some sort of lightweight (ceramic?) normally-aspirated engine. Although the new Porsche cars greatly reduced turbo lag, there's nothing like the bark of the CGT! (and customers are starting to see that). I don't believe a turbo car can ever get there (although it will always have that great performance/mpg tradeoff, as well as easy to increase HP). The Z06 was a rude wake-up call for Porsche; marginally acceptable mileage with outstanding performance!

Interesting note: It took Porsche almost 30 years to move the 0-60 from 5 seconds to 4 seconds. Is that time, sedans have moved from 10+ seconds to 4 seconds!

vrus

Nice car Bill!!

Mercs are my specialty! I've been building 55K parts for the two years which is why I've been absent from the Porsche scene.. They make incredible cars but my own Merc is an E55.. I favour the Kompressor cars for their ease of upgradability.

Beautiful car nonetheless.. Enjoy in good health.

Jean

Bill, certainly an amazing car, I read the specs, I would have never thought it could be so great, thanks for the info.

Do you mean to say that the horizontal line in the graph are the long Gs? Tell me it's not? Or maybe the scale is way too broad ?

Bill S.

Jean, sorry to tell you it is! The transmission is amazing. Here's an easy 0-100 run. I just stomped the gas in automatic Sport mode from a dead start. No wheel spin! The shifts are nearly imperceptible. Mercedes has a lot of money to develop stuff like this: