GT4 - Unlocking the Power Potential!
#16
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#17
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From the gear ratios thread:
Of course BGB pulled this off in a standard 981 body, whereas Porsche had (and took) the opportunity to change the body in white for the GT4 since AP claimed that the 991S motor didn't fit at first, so maybe they could have done it even more easily than BGB and offered the Powerkit at least as an option. Given what the Powerkit costs though, I for one am glad that they at least didn't make it standard.![thumbup](https://rennlist.com/forums/graemlins/thumbup.gif)
Of course BGB pulled this off in a standard 981 body, whereas Porsche had (and took) the opportunity to change the body in white for the GT4 since AP claimed that the 991S motor didn't fit at first, so maybe they could have done it even more easily than BGB and offered the Powerkit at least as an option. Given what the Powerkit costs though, I for one am glad that they at least didn't make it standard.
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I'm suspecting the reason they didn't do it,besides cost,it's so they can have a power bump for the RS...
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#19
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Although,IMO it will be Manual as well. I would've said that there's a possibility PDK can be offered as an option,but seeing Porsche's latest trend with the small GT department,they probably won't go through the trouble of offering 2 drivetrains...
#20
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Well I'm just speculating here. I could also imagine them not doing it because it would have decreased cabin space above the motor to the point that even more GT4-specific parts would need to be created and rear visibility would become even worse (possibly running afoul of regulations somewhere in the world?), or maybe the solution just aesthetically isn't pretty. I've never seen an X51 conversion in-person, and BGB is perfectly understandably reluctant to go into too much detail on how they work their magic, so it's hard to even make educated guesses about why Porsche didn't do what BGB managed. But it should be obvious that aftermarket companies like BGB offering tailor-made conversions have far more flexibility and far fewer regulatory considerations to deal with than OEMs building cars for several world markets designed to appeal to a larger customer base using factory assembly lines that have already been tooled up. For example, I remember reading an article on the new RS where AP said that the 21" wheels were a huge production problem because the slats that run alongside the assembly lines where the wheels are held until they're mounted would only fit 20" wheels, so Porsche spent a hideous amount of money widening those slats to accommodate 21s (likely because they knew future cars would use them). Of course that wouldn't be an issue with BGB, and in fact it wasn't an issue for Porsche on the 918 since it had a completely separate assembly process, but I just bring it up as an example that just because something is possible for an aftermarket company doesn't mean it's possible (or at least feasibly so) for the factory. Factories get to realize economy of scale that the aftermarket doesn't, but they also have to swallow much higher upfront costs to get there, and sometimes those numbers just don't add up, in which case they may well decide to work within the constraints of what they already have.
Last edited by jphughan; 07-08-2015 at 01:43 PM.
#21
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If the final figures are ~415hp with 7-speed PDK-S (top speed in 7th gear near peak power of 7,500rpm), I think this car will give the 991.1 GT3 a pretty good chase at most shorter tracks. I guess with the 991.2 GT3 coming soon with ~495hp this should maintain a gap...
#22
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We're just speculating anyway...Porsche won't even admit there's an RS coming,so all bets are off...
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The only reason I'm chiming in is to address things that I don't agree with; while cost may have been a reason, I don't think it's to create a hole for an RS model. The new coolant fill expansion tank is the reason the manifold doesn't fit. Porsche didn't do it to fool anyone; it would have required a total re-engineering of the engine bay and how the coolant is added from the fill hole next to the LR shock tower. It requires hours of grinding and fitting and each and every time the customers were made aware of what was required and we did what was asked of us. It's not rocket surgery...it just wasn't plug n play and not possible at the time. The motor is the same exact height as the 3.4L. That's the scoop. There you go.
Last edited by BGB Motorsports; 07-08-2015 at 01:49 PM.
#24
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Im not refraining to watch people stew and the only reason I'm chiming in is to address things that I don't agree with; while cost may have been a reason, I don't think it's to create a hole for an RS model. The new coolant fill expansion tank is the reason the manifold doesn't fit. Porsche didn't do it to fool anyone; it would have required a total re-engineering of the engine bay and how the coolant is added from the fill hole next to the LR shock tower. It requires hours of grinding and fitting and each and every time the customers were made aware of what was required and we did what was asked of us. It's not rocket surgery...it just wasn't plug n play and not possible at the time. The motor is the same exact height as the 3.4L. That's the scoop. There you go.
#25
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The only reason I'm chiming in is to address things that I don't agree with; while cost may have been a reason, I don't think it's to create a hole for an RS model. The new coolant fill expansion tank is the reason the manifold doesn't fit. Porsche didn't do it to fool anyone; it would have required a total re-engineering of the engine bay and how the coolant is added from the fill hole next to the LR shock tower. It requires hours of grinding and fitting and each and every time the customers were made aware of what was required and we did what was asked of us. It's not rocket surgery...it just wasn't plug n play and not possible at the time. The motor is the same exact height as the 3.4L. That's the scoop. There you go.
Awesome! Thank you for chiming in and again, thanks for what you do for the community.
I'm curious if you have any input on my other questions about CARB certification, etc.?
Thanks.
#26
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Honestly, given the level of competence I've observed at CARB test sites, and the fact that you can't even see the motor on a Cayman, I don't envision having any difficulty passing a visual inspection.
#27
Burning Brakes
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It's not the visual inspection that I'm worried about. There's no way anyone can see the filters, for example. But I believe, and please correct me if I'm wrong, that aftermarket cats normally do not pass the State's sniff test. I don't know how the ECU tuning would affect that.
#28
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It's not the visual inspection that I'm worried about. There's no way anyone can see the filters, for example. But I believe, and please correct me if I'm wrong, that aftermarket cats normally do not pass the State's sniff test. I don't know how the ECU tuning would affect that.
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We aren't trying to spook anyone with the things we do; I don't know what it is but folks always ask us for some extreme projects. The whole rear intake scoop thing is another one. And yes, I bought that thing on a web site in California that sells carbon fiber Subaru WRX parts. We have just spent so much time without any Cayman support the only thing we know to rely on is the "old college try!"
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#30
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