Chris P Lewis

https://drive.google.com/file/d/1OTe...ew?usp=sharing

Page 169ish..

DR.S

Thanks guys

thejoyofdriving

Does anyone know how this intake system would sound like on a street car? Probably a silly idea but I'd be interested in it simply for, what I can only imagine to be the glorious intake noise that thing let's through.

thuggo

You'd have to really screw up the rear of the car to make this work on a street car.

Moondog4224

is that installed or just the kit… thx

BGB Motorsports

That's my kit that i designed during the pandemic when we received an $8,000 box of what looked like industrial drier ducting and 3D printed pieces for the two factory MRs in our shop.

I have since had to re-design this kit 3 times because the box keeps getting discontinued. The reason i have been quiet is because i had to get the box made and a newer, larger, 4" window made. Photos will be coming soon. Installing two kits now in the shop going in 4.2L cars going to the west coast. More information to follow.

Finally, to anyone that gave my kit praise and suggested it as an alternative, from someone who has owned a business for 20 years that gets tired of making the same things over and over and over again for people to copy and sell THANK YOU! A lot of time went into this kit, to the point that i will have to probably sell 50 to recoup any real benefits...but...if you wanna support a small business that has empirical data of why their kit that costs half as much is a great alternative, please don't hesitate to call, email. AJ is almost up to speed after a year but the Rennlist PMs don't get any love and for that i apologize.

Thank you.

John

thuggo

You've had me thinking hard about your kit for awhile now for my 981. Very easy to see the power loss on a "hot" day at Road Atlanta with the normal intakes.

BGB Motorsports

This is when it's really going to show its value. In the winter months the intake air temps are fine. It's 55F out so the air going to the engine is about 85F. When it's 94F outside at Road Atlanta and you just had two cheeseburgers before your afternoon session, you and YOUR CAR are running at a snail's pace because in stock form it's digesting much hotter air. Now the air temp is 110F. When i raced the car in World Challenge in 2020 it felt great in the mornings but in the afternoon it would no longer fall on its face. I tell people all of the time that "if you're trying to improve on a PB lap time in a Cayman, if you don't do it in the morning session it's never going to happen.

gman3280

This is pretty interesting. I don't have a gt4 but my first though was taking the intake air from the windows allows for a setrab cooler where the intake was in the side intake. Anyone tried this?

whojoemama

Does anybody have actual dyno data on these parts. BGB suggests a 25 degree cooler intake air yields a 25 bhp increase in power. I’m not sure that math is correct.

DR.S

density = pressure_absolut / (gas_constant x temperature_absolut)

with
1bar = 100000Pa
gas_constant for (dry) air = +- 287J/kgK
(humidity influences in the range of +- 0,4%)

yields to
density = 1,188kg/m3 at 20°C
density = 1,112kg/m3 at 40°C (93,6% of 20°C value)
density = 1,046kg/m3 at 60°C (88,0% of 20°C value)

Theoretically a 400HP car loses 48HP due to intake temp rise from 20°C to 60°C
I don't know how this is / can be compensated due to a different injection / timing strategy in combination with higher fuel consumption...

Chris P Lewis

My data on the PMNA kit is that it gets Intake Air Temp within 3 degrees F of Outside Air temp. Pretty sure that Intake Air Temp can't be less that the Outside Air Temp. The reduction I saw was around 12 to 15 degrees F. I may not have the channel names totally correct at this time of day.

BGB Motorsports

I tried this in 2010. I wouldn't do this because you have the cooler in the intake hole and then you have the hot heat from the backside on the cooler that's not going into the engine bay. You're now adding even hotter engine bay air.

As always, thank you Dr. S for an extremely detailed and educated response. I wish i even began to be able to memorize those figures.

I will reply. Yes, i am the person that designed and yes i am the person that's selling it; i am also the person that has a near 15 year track record on here of being conservative and not using ridiculously exaggerated claims like other people on here.

Question: Will my intake add 25rwhp to your car on track when it's 40F out? No, because at that point whether you're running my intake or the factory one, the air going to your car is roughly 20F over the 40F. That is not the 25rwhp increase of which i am talking; i am talking about how when you're on track and it's 85F out (which is rather typical for any day of the year if you live in the southeast), THEN...THEN...without the intake you're sucking over 105F air into your engine. WITH the intake you're sucking 90F air into your engine. And it's on the dyno and on the track where the car loses 20rwhp from that.

Ask anyone on the planet if they're ever gone faster around a race track they already know in the afternoon vs. the morning when it's summertime in a Cayman. it won't ever happen. because the heat soak. both you and your car after lunch are lazier than hell!

So...does my intake add 25whp if you ice race the Cayman? No. HOWEVER, if you ice race the Cayman to speeds of over 120mph then in fact my kit WILL because it's sourcing it from an area of greater pressure which is why at Daytona this intake took our car from 177mph to 183mph! So... i have dyno data. I have race track data suppored by wind tunnel data. If you need additional i am more than happy to help!

IPSA

I recently installed the BGB kit on my 16 CS MR Evo

On an 85 degree day at Homestead a month ago my Motec data shows 5 -7 degree reduction in intake temps on average and also the temps stay lower longer in between spikes which are when the car slows down. Both of these improvements seemed to help extend the time before the heat sink issue appeared.

Kit is very well made.

BGB Motorsports

I am going to ask AJ which kit you purchased because this is the kind of support i love and i want to follow up with a phone call to talk about some stuff! I have another car running the box in South Florida but we installed the blower fans to EXHAUST air FROM the engine bay and he saw big big big drops in oil temps, PDK temps, trans temps, coolant temps, etc. It actually purged air from the car that was so hot it began melting things. It's working! I can tell you what we did as it's not something proprietary like the airbox!