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When reading dyno charts, first thing to look at, is Horsepower & Torque curves are always equal at 5252 rpm, these dyno charts are not accurate.
The HP and TQ curves only cross at 5252 rpm when the tq units are lb-ft and the scale is the same for both hp and tq, neither of which is true in that graph.
I'm not saying the graph is real, just saying that your comment about the cross point is incorrect.
Replacement Engine part number seems to be identical for both MY18, so I suppose differences are intake, exhaust and ECU mapping...
Mainly ECU mapping.
A friend is working on a project car using a 991.2 GT3 engine which they are tuning using the Motorsports ECU. So far using a cat-less exhaust (with stock headers) they have seen 488 hp at the wheels on a conservative 91 octane map. Expecting well over 500 at the wheels with a more aggressive tune (without headers) on an engine that is nominally 500 at the crank.
Significant parts of the new 9A1 are now shared with the RSR giving amazing potential. My conclusion is that both the 991.2 GT3 and .2 RS are tuned to well below their full potential in order to leave room for future improvement in spite of the need for gas particulate filters. I think we’ve only seen glimpses of what these engines will produce when finally uncorked and free to breath.
A friend is working on a project car using a 991.2 GT3 engine which they are tuning using the Motorsports ECU. So far using a cat-less exhaust (with stock headers) they have seen 488 hp at the wheels on a conservative 91 octane map. Expecting well over 500 at the wheels with a more aggressive tune (without headers) on an engine that is nominally 500 at the crank.
Significant parts of the new 9A1 are now shared with the RSR giving amazing potential. My conclusion is that both the 991.2 GT3 and .2 RS are tuned to well below their full potential in order to leave room for future improvement in spite of the need for gas particulate filters. I think we’ve only seen glimpses of what these engines will produce when finally uncorked and free to breath.
fascinating.
Ive been checking into doing an exhaust and intake. As the engine is 99% the same between .2 GT3 and .2 RS, I’d love to get at least RS power from my .2 GT3.
For warranty reasons I’m not currently ready to mess with the ECU, but I’d like to do everything else I can to maximize my .2 GT3.
As a .2 GT3 owner I’m interested....I changed to the BMC filters when I did my Soul Side Muffler bypass. What’s different in the GT3 and GT3 RS exhaust? Nothing I can tell from the titanium center muffler but it seems to flow the same right? Just that it’s titanium for weight loss?
The regular GT3 intake doesn’t seem restrictive.....maybe the side air intakes on the RS get more air flow over the rear scoop intakes of the Gt3?
Would be interesting to know what Porsche did different in the tuning of both the 3 and RS ECU.
Not sure frankly, but seem to be option variants (573/574 Air Con) with exception of x which seems to act as a divider. However none except 00 return a price in the german site online price query...
A friend is working on a project car using a 991.2 GT3 engine which they are tuning using the Motorsports ECU. So far using a cat-less exhaust (with stock headers) they have seen 488 hp at the wheels on a conservative 91 octane map. Expecting well over 500 at the wheels with a more aggressive tune (without headers) on an engine that is nominally 500 at the crank.
Significant parts of the new 9A1 are now shared with the RSR giving amazing potential. My conclusion is that both the 991.2 GT3 and .2 RS are tuned to well below their full potential in order to leave room for future improvement in spite of the need for gas particulate filters. I think we’ve only seen glimpses of what these engines will produce when finally uncorked and free to breath.
Interesting. Do you know some of the more significant parts shared with the RSR? It would support the comment made around the launch of the new engine that is has potential over 600hp.
Interesting. Do you know some of the more significant parts shared with the RSR? It would support the comment made around the launch of the new engine that is has potential over 600hp.
I don't know with certainty exactly what is shared as I have not seen a tear-down or part numbers. That said I have heard whispers, and externally they are extremely similar bar the intake and ancillaries. Internally I believe even the crank may be shared, though if Porsche follows form the pistons and rods and cam on the RSR will be different. It's interesting to notice how close the street and competition engines are now even regarding redline. The power figures below will be with cams designed for restrictor plates which typically limit power to around 550 hp. Over 600 seems very doable without that design requirement, but the numbers below aren't too shabby regardless...
By the way the crank oiling and finger follower cams in the new engines are epic- not shocking if they can be reliably raced with fewer modifications than the Mezger.
I'll take that bet! Just to be fair... $1USD says nothing outside of ancillaries and a few fasteners are shared.
I’ll happily take you up on that. Not because I believe I’ll win, but because I’d love to see a copy of your Motorsports parts disk for verification- I only have up through the end of the mezger. We should also clarify- Motorsports has their own part numbers for things like the engine case/ block even if they are virtually identical physically. We’re looking for physical functional differences in the parts themselves here.
From what I’ve seen the new RSR shares far more than the old one (which had a completely revised cooling system and ancillaries, 10k+ rpm crank, etc) but I’d appreciate being proved wrong if that’s the case.
05-02-2019, 09:57 PM
