Discussion
n17ves said:
Well we all know dynos are a bit of a numbers lottery......359 
Interestingly with the exhaust flaps open there is a bit more torque below 4k, no difference above.
That is surprising and not in character. Interestingly with the exhaust flaps open there is a bit more torque below 4k, no difference above.
I need to take mine to SRR and check it there. Charlie's dyno is very good (I've calibrated it across many cars) and therefore need to see what it says about the GT4.
However, given that on track the GT4 is no slower than a 996 GT3 in a straight line, I expect it to have something in the 390s.
LaSource said:
That is surprising and not in character.
I need to take mine to SRR and check it there. Charlie's dyno is very good (I've calibrated it across many cars) and therefore need to see what it says about the GT4.
However, given that on track the GT4 is no slower than a 996 GT3 in a straight line, I expect it to have something in the 390s.
I've been on track with a few 996 GT3 and never lost any ground to them in a straight line. Normally the reverse. Normally closing up gaps. I need to take mine to SRR and check it there. Charlie's dyno is very good (I've calibrated it across many cars) and therefore need to see what it says about the GT4.
However, given that on track the GT4 is no slower than a 996 GT3 in a straight line, I expect it to have something in the 390s.
Edit: sorry, mis-read you first time. See we agree it's very similar to 996 GT3
Edited by jackwood on Monday 13th June 14:41
n17ves said:
Nothing looks untoward on the graph and it certainly pulls well enough against other cars.. The guys that run the dyno reckons all Porsches run low on the dyno, could just be incorrect transmission losses at a guess (but I'm no expert).
told you a M3 is just as fast with a real >400bhp :-)dynos are odd though as they show peak at 6100 rpm and the 2nd peak should be at 7400rpm with the higher bhp figure.
Edited by Porsche911R on Monday 13th June 14:28
Porsche911R said:
n17ves said:
Nothing looks untoward on the graph and it certainly pulls well enough against other cars.. The guys that run the dyno reckons all Porsches run low on the dyno, could just be incorrect transmission losses at a guess (but I'm no expert).
told you a M3 is just as fast with a real >400bhp :-)lemmingjames said:
You should take one of the others on as well and compare car 'b's results from this time and the last time (shoot-out) results and the compare to the GT4
Yep - when I go I was intending to also take a 996 GT3 that has been there before so that there are some reference points.GT4 has this odd issue at 6100rpm though when the bhp drops, when peak is listed at 7400 rpm !
so no dyno is showing the 2nd peak right, that might be the ram air effect on the side scoops or some thing but imo atm DYNO's are bulls
t to show GT4 peak BHp.
unless we have all been conned and we have a 6100 peak BHP limit and it's all to st after that due to the small TB !!!
put it this way the 981 Spyder no slower with even less BHp, and even my 987.2 car will stay with a GT4 till 90 mph !
ANd tims GT4 cannot even out drag a 981 GTS PDK !
along with the 18mpg st figure vs a >400 BHP 991 some thing in the GT4 tune is really crap !!!
so no dyno is showing the 2nd peak right, that might be the ram air effect on the side scoops or some thing but imo atm DYNO's are bulls
t to show GT4 peak BHp.unless we have all been conned and we have a 6100 peak BHP limit and it's all to s
t after that due to the small TB !!!put it this way the 981 Spyder no slower with even less BHp, and even my 987.2 car will stay with a GT4 till 90 mph !
ANd tims GT4 cannot even out drag a 981 GTS PDK !
along with the 18mpg s
t figure vs a >400 BHP 991 some thing in the GT4 tune is really crap !!!Porsche911R said:
TTRS would make both the GT4 and M3 look slow in a drag race mine did 8.5 to a ton In a manual and DSG cars were in the low 7's
Relevance?I was pointing out that TTRS made 393 on this set of rollers, but everyone claims (including yourself) 410-420bhp. My chargecooled Exige made 288 on this set of rollers, but made 300+ everywhere else. Maybe its low (Ive no idea), just did it out of curiosity.
But what I do know is the acceleration of the GT4 seemed to be on par with a 997 GT3 (on track) down the straights. A GT4 should have had the legs on an M3 down the straights, and then left it for dead under the braking and the corners (particularly the high speed ones).
Also to note is Porsche upgrade power kit due out on the GT4 CS in July to make it competitive vs well every thing else really.
"These kits will be available for purchase to upgrade current cars to run in FIA GT4 specs"
will be very interesting to see what this BHP kit is for the race cars.
As not only is my mates M3 as fast as mine on the road, the M3 GT4 wips the Porsche GT4 on track also :-(
"These kits will be available for purchase to upgrade current cars to run in FIA GT4 specs"
will be very interesting to see what this BHP kit is for the race cars.
As not only is my mates M3 as fast as mine on the road, the M3 GT4 wips the Porsche GT4 on track also :-(
Edited by Porsche911R on Monday 13th June 15:13
Porsche911R said:
again looka t where your peak BHP in the GT4, it should NOT be at 6100rpm !
Actually an interesting point.... Just done a quick Google to see if I can find any graphs to compare against and they all seem to have max power around 6400rpm. Porsche qoute 7400 done they?!
Could be down to not getting the ram air effect through the side vents on the dyno (only had one big fan at the front of the car)
GT4P said:
still think the 3.4 TB is giving poor economy and would restrict the power,would be interesting to see stock v 3.8 TB and plenum upgrade on the same dyno!
I believe Tim (Ravon) will be fitting the throttle body, plenum and headers to his GT4 soon, would be interesting to see before and after figures. Would probably need another car to run both times as a reference without modification as a standard. that graph pretty much echos how my 981 Spyder feel actually, I rarely rev it to the red line as it feels like its struggling, I was wondering if they changed the cams or have restricted the engine slightly to keep the power down, the lower revs and mid range are good which to be fair on the uk roads/limits is ideal but I always feel it lacks a bit at the top when I want to wring its neck.
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