718 GT4?
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Once the manufacturer homologates a vehicle (in this case using the street GT4 as a case) you can't change it.....it's very clear for GT4. If they could change engine don't you think Porsche would have added the X51 and/or 4L stroker during the past 2 season? They were allowed to improve power to weight ratio and a bit of suspension work...or maybe they should have tried a GT3 engine in order to equalizer the battle with McLaren and the other manufacturers who came later into GT4 with much more capable cars. But that can't be done as it would mean an all-out $$$$ war between manufacturers. They have other upper GT classes for that.
The article on the Fiat doesn't say 100% as a done deal that it will use the 4C engine...they are speculating and you know how magazines like to speculate. Also, it's mentioned that it may compete in the Italian GT championship, not sure how the rules for that class in that country overlap with the GT4 rules from RACB/SRO/IMSA which are the ones Porsche use for the GT4 as it can be raced in a myriad of places around the world with minor or no modifications, while keeping cost down...well somewhat down.
Anyway....the GT4 competition may provide us a nice upgrade in the engine department. Now lets wait and see what they show in December.
The article on the Fiat doesn't say 100% as a done deal that it will use the 4C engine...they are speculating and you know how magazines like to speculate. Also, it's mentioned that it may compete in the Italian GT championship, not sure how the rules for that class in that country overlap with the GT4 rules from RACB/SRO/IMSA which are the ones Porsche use for the GT4 as it can be raced in a myriad of places around the world with minor or no modifications, while keeping cost down...well somewhat down.
Anyway....the GT4 competition may provide us a nice upgrade in the engine department. Now lets wait and see what they show in December.
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From: Somewhere in a galaxy far, far away....
That's precisely my point though. Homologation "locks down" the engine to be used in the race car (in this case the New GT4 CS) so that it then can't be subsequently changed. But that doesn't equate to the homologated race car having to have the same engine as the street car. What's to stop the New GT4 CS from being launched with (say) a Porsche 4.0 litre N/A engine (locked down upon homologation) whilst the New GT4 road car is launched with (say) a 3.0 litre turbo? None of what's stated above prevents that from being the case, does it?
GT4 racing is the spirit of street cars. They can only be up tuned or detuned versions.
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Where in the GT4 regs does it say this?
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Do you know if the additional oil is via a bigger/deep sump oil pan? Would be a nice upgrade for those of us that use Slicks or Hoosiers for track days....since the Race Manual says "No Slicks " on the Street car.
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That's precisely my point though. Homologation "locks down" the engine to be used in the race car (in this case the New GT4 CS) so that it then can't be subsequently changed. But that doesn't equate to the homologated race car having to have the same engine as the street car. What's to stop the New GT4 CS from being launched with (say) a Porsche 4.0 litre N/A engine (locked down upon homologation) whilst the New GT4 road car is launched with (say) a 3.0 litre turbo? None of what's stated above prevents that from being the case, does it?
For GT4 the homologation model is the Street car. You don't homologate the race car while having a different street version of it....that's the whole basis of having homologations on some categories, so you race what the manufacturer produces for the street, not a one-off special that is only limited by your budget.
You have the street car as a base to get all the specs for the race car, so the sanctioning body has actual specs and information from a manufacturer to judge if the car is eligible for the class or not.....maybe because this time the CS is being launch first is making thing s a bit fuzzy but you start your homologation with a street car.
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Specifically to your question, based only what is written in the SRO regulations which are readily available on the internet, the answer is unclear. In 2016 the language was much more clear: 2016 GT4 Regulations
The 2018 regulations do not have such a clause. But at the end of the day, I am in agreement with others that the race teams know what is coming, and that the street car will have the same engine.
Also, with the BoP constraints, the Cayman GT4 does not need a GT3 engine or a turbo to compete. The other cars in GT4 like the McLaren and others already have significant BoP restrictions imposed like weight, RPM, intake, etc. to make the cars "equal". If Porsche put a GT3 engine in the GT4 it would have additional BoP constraints which would force it to be "de-tuned" anyway. This would make the cars much more costly for essentially no reason...
5.1 Type and position of engine
The make and type of engine used must remain original, unless by a waiver of the SRO GT4 Bureau. The position of the engine, the location and orientation must remain original.
The make and type of engine used must remain original, unless by a waiver of the SRO GT4 Bureau. The position of the engine, the location and orientation must remain original.
Also, with the BoP constraints, the Cayman GT4 does not need a GT3 engine or a turbo to compete. The other cars in GT4 like the McLaren and others already have significant BoP restrictions imposed like weight, RPM, intake, etc. to make the cars "equal". If Porsche put a GT3 engine in the GT4 it would have additional BoP constraints which would force it to be "de-tuned" anyway. This would make the cars much more costly for essentially no reason...
Last edited by sonorous; Nov 6, 2018 at 04:03 PM.
