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The side window intakes don't necessarily increase power so much as reduce iat. IAT were higher on the 718cs vs 981cs potentially because the new front bumper design of the 718 added the side air curtains basically funneling hot post rad air to the side intakes (just my wag).
IAT may be worse on 718CS than 981 but I measured my 981 (w/ GT4 front bumper) on track and the intake temps are atrocious. In 70F weather you're feeding 90 to 95F air into the side scoops after a couple of hot laps. That's with 1 temp sensor on the edge of the intake scoop and another on the side window. Side window temp remains ambient.
But this effect only happens when you're hammering it on track for an extended time. On the street you're getting pretty nice fresh air into the scoops as there isn't nearly as much heat coming off the front rads in a normal situation so there's nothing to be gained from changing the intake location.
IAT may be worse on 718CS than 981 but I measured my 981 (w/ GT4 front bumper) on track and the intake temps are atrocious. In 70F weather you're feeding 90 to 95F air into the side scoops after a couple of hot laps. That's with 1 temp sensor on the edge of the intake scoop and another on the side window. Side window temp remains ambient.
But this effect only happens when you're hammering it on track for an extended time. On the street you're getting pretty nice fresh air into the scoops as there isn't nearly as much heat coming off the front rads in a normal situation so there's nothing to be gained from changing the intake location.
Oh, yes, agreed, and thanks for the clarification. They aren't great on the 981 either, it's just my own maybe way off base theory. An alternative possibility is the extra power is adding more heat to the intake tract and there's actually no change in air flow from the different front bumper design. I'm speculating since the 981cs ran for years without the window intakes but Porsche developed the window intake mod shortly after release of the 718cs so it seems like some change between the two gens necessitated the intake. I'm really excited for the GT4rs to see if there's an opportunity to retrofit the window intakes into a 981. On hot days at the track the loss in top end is noticeable....
From what I read on here about the CS was that the side intakes IATs were limiting power at the top end being so close to the surface, picking up all that reflected heat with it. Therefore the side window intakes were developed and based on the tubing shown are the only source for intake air into the engine.
IIRC weather published OATs are measured at average face level and not at ground level for the same reason as applied to the CS..
Not like the bucket seats are torture devices, they are very comfortable and can be driven around town as well.
I agree and wouldn't own a Porsche without them, but not everyone agrees and Porsche is smart enough to offer their RS cars with a choice of seats to satisfy their customer base.
I agree and wouldn't own a Porsche without them, but not everyone agrees and Porsche is smart enough to offer their RS cars with a choice of seats to satisfy their customer base.
They definitely require some modifications, but once you add some lumbar support even with a folded towel and use one of the tilt adjustments, it's a pretty great seat.
I really hope they upgrade it to be foldable though... Lamborghini has done it with their torture rack carbon seat.. I can't imagine it's a different supplier for Porsche?
I agree and wouldn't own a Porsche without them, but not everyone agrees and Porsche is smart enough to offer their RS cars with a choice of seats to satisfy their customer base.
Won't be an issue with the Cayman but I just wish they folded so I could get stuff behind them in the 911.
I agree and wouldn't own a Porsche without them, but not everyone agrees and Porsche is smart enough to offer their RS cars with a choice of seats to satisfy their customer base.
I’m fat. Porsche’s bucket seats annoy the hell out of me, but not as much as McLaren. Ferrari has the road car racing seat down to perfection.
Porsche developed the window intake mod shortly after release of the 718cs so it seems like some change between the two gens necessitated the intake. I'm really excited for the GT4rs to see if there's an opportunity to retrofit the window intakes into a 981. On hot days at the track the loss in top end is noticeable....
It is definitely interesting - the 981 CS do pretty badly when it gets warmer even completely stock. You imagine that Porsche would've been aware of the reasons etc during testing but then after the introduction of the 718 CS they come up with a (rather jerry rigged) solution. Maybe they underestimated the losses in terms of competitiveness... but now the fact is that with the window intakes the Porsches are just about the quickest car on the straights in GT4 racing.
It is definitely interesting - the 981 CS do pretty badly when it gets warmer even completely stock. You imagine that Porsche would've been aware of the reasons etc during testing but then after the introduction of the 718 CS they come up with a (rather jerry rigged) solution. Maybe they underestimated the losses in terms of competitiveness... but now the fact is that with the window intakes the Porsches are just about the quickest car on the straights in GT4 racing.
Not following much GT4 right now but....Is this because of the new intakes or a combo of BoP rules + intake?
They definitely require some modifications, but once you add some lumbar support even with a folded towel and use one of the tilt adjustments, it's a pretty great seat.
I really hope they upgrade it to be foldable though... Lamborghini has done it with their torture rack carbon seat.. I can't imagine it's a different supplier for Porsche?
I agree with this 100%...the reclining brackets are a must if you track the car....using a helmet pushes you forward. Will probably also add memory foam from P1 Designs to mine.
You can add some extra foam to the whole seat as I have done or just pick out the appropriate spot to apply 1/2 an inch of soft or medium foam under the alcantera covering for additional lumbar support. Not hard to do, and the seat backs pop right out. They are only held in place by velcro.
I am experimenting with pieces of soft and medium foam cut to size on top of the seat to see how big of a piece I need. It does not move around on short drives and you can move it up and down to see where the placement would be and how big the piece should be.
Once I figure out what I like after experimenting with different sizes and densities of the foam, I will open up the backrest insert and place the foam in just underneath the alcantera. If happy with everything, I will then reopen the seat insert again and use some 3m spray glue to attach the lumbar support to the other foam I have already added above the factory foam. See below link for details on that upgrade if you haven't already seen it.
It is definitely interesting - the 981 CS do pretty badly when it gets warmer even completely stock. You imagine that Porsche would've been aware of the reasons etc during testing but then after the introduction of the 718 CS they come up with a (rather jerry rigged) solution. Maybe they underestimated the losses in terms of competitiveness... but now the fact is that with the window intakes the Porsches are just about the quickest car on the straights in GT4 racing.
…but still not very competitive in traffic where they can't get clean, cool airflow. This caused one team to switch mid-season last year to an Aston Martin, and others looking at other platforms as well.
Can you describe the characteristics of JEGS foam, thickness, density etc... as for installation are those pieces simply held in by friction or did you use velcro?
Thanks
PS, love the fabric pattern, if that were available in SportTex I would give it a go.
01-28-2021, 05:09 AM
