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longone
216 posts
109 months
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spitfire4v8 said: I think it's primarily a function of inlet tract length. Certainly the SP6 engines all exhibit that same torque curve trend even with different cam timing .. but when I did my inlet length comparisons the longer lengths produced a more normal looking curve, but killed the top end power when the lengths went very long. Hi, cheers, yes that was Scholar's expectation. I'd asked for high flat torque particularly low down and no real interest in max power but they felt getting the torque curve back would limit breathing at high revs. Incidentally mine was a bit worse that those published here, a real sharp V then back up as normal. Colin.
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s5tvr
1,216 posts
102 months
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RedSpike66 said: Porsche published figures currently.... | Engine | Bhp | Torque | | 3.4 | 330 | 272 | | 3.6 | 345 | 287 | | 3.8 | 385 | 309 | | 3.8GTS | 408 | 309 | | 4.0GT3 | 500 | 339 | Standard road cars, not specials, and only a few £billion R&D budget Looks like the 3.6 SpeedSix does quite well in comparison.... I lifted the following from Wikipedia 996 GT3 (Mk1) 1999-2001 3.6 360bhp 996 GT3 (Mk2) 2003-2005 3.6 381bhp 996 GT3 RS 2003-2004 3.6 381bhp 997 GT3 (Mk1) 2006-2009 3.6 415bhp 997 GT3 RS (Mk1) 2006-2009 3.6 415bhp 997 GT3 (Mk2) 2009-2011 3.8 435bhp 997 GT3 RS (Mk2) 2009-2011 3.8 450bhp 997 GT3 RS 4.0 2011 4.0 500bhp From memory I think it was Porche's head engineer of the GT3 programme who said that not a single 996 3.6 GT3-RS left the factory with less than 395bhp even though they only quoted 381bhp. Similarly, I've seen a new (with only a few thousand miles on it) 997 3.6 GT3-RS make 445bhp on a dyno. Unlike Ferrari, Porsche tend to be conservative with their quoted power numbers. Agreed in standard form the 3.6's are comparable but look how much more Porsche extract from the engine when fully developed - it makes me think that lack of development / testing is what mainly holds the SP6 back power-wise.
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BCA
8,597 posts
126 months
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s5tvr said: I don't know enough about the design and limitations of the SP6 engine but Porsche manage to get 440bhp out of their 3.6, so why not out of the SP6 ? I would imagine that the SP6 is probably capable of more but was never optimised at the factory as R&D would not have been commercially viable. Apples and oranges. That's Porsche engines... their GT1 engine block derived GT3 engines are a step above the standard Carrera items. The performance came through huge budget design and engineering excellence. So yes, apples and oranges - the TVR S6 3.6, is a peach, different again, but peachy. Much like its AJP8 brother, it punches above its weight, especially considering its (comparitively to Porsche Motorsport) humble origins.  
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RedSpike66
1,973 posts
81 months
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BCA said: Much like its AJP8 brother, it punches above its weight, especially considering its (comparitively to Porsche Motorsport) humble origins. I think thats very true. Considering there's no rocket science in the TVR engine, and it's a pretty ordinary TVR ECU, Porsche for all their might, weren't producing much more power from a 3.6 until approx the 997 GT3 in 2006, when TVR were dead and buried by then, and the engine hadn't changed much since late 90s. in reality. It will be interesting to see what the FFF engines produce when RG have finished developing them and to see how they stack up against the 500bhp 4.0L GT3 engine...
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clive f
6,707 posts
102 months
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 this was an interesting thread until people started comparing tvr to porsche,.... who cares?
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RedSpike66
1,973 posts
81 months
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 .. .. .. Well in our defence  the thread had pretty much finished with Jools saying he had no time/money to spend on any more developments at the mo... When will you be fitting new injectors and re-mapping the 4.0S Clive ??
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clive f
6,707 posts
102 months
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unno, I might post the results on the porka forum 
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RedSpike66
1,973 posts
81 months
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Unno ?? What type of inglishce is that ?? I'm sure the porkers won't mind comparing your figures
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