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Unfortunately I don't have hard data, but anecdotally on my Spyder it seems I'm getting 2-3 psi more increase with the unshielded Kline system vs. stock. Stock I used to see a 4-5 psi increase after normal driving, now it's closer to a 7-8 psi increase. The difference actually seems more noticeable with unspirited driving (e.g. stuck in traffic), where I'm seeing rear tire pressure increase faster from cold.
I'm not too worried about any component damage back there, but just to keep heat soak down I am considering swapping for shielded Kline OAP.
This would surprise me since I've been tracking my GT4 all summer with the Kline SS sans heat shields in 100+ degrees.
I opted to get heat shielding on my OAPs. Porsche decided to heat shield these OAPs not just for the 718, but also for the 981 which didn't have GPFs. My thoughts is that Porsche wouldn't waste money on heat shielding unless they felt it was beneficial.
Maybe, yet they’ve put out OAPs in tens of thousands of cars in markets that don’t monitor or need them.
I have seen no increase from the normal tire pressure range on my cat-back Kline Inconel. Granted, I do not track, but I do drive it hard and usually shift at 6K and above.
Both the tire pressure thing and the "turbulence" thing are non-issues and just people speculating. I have had mine up to 150ish on I-5 at night and no issues with anything odd in regards to wind.
For non heat shielded Kline owners, can you tell me how much your rear tire pressure increases from a spirited drive? For example, on my stock car, rear tires are 35 psi cold. When I go on a spirited drive the rear tires heat up to 40-41psi. I’m trying to figure out with the Kline without heat shield if the tires will heat up even more or will it be the same.
I have seen zero variance on spirited diving and autocross events. I haven't done a true track day yet but I doubt there will be any difference there either. I see more variance if I am loading up one side of the car more or doing heavy breaking (fronts) than increases it the rear. Yea, they all go up a few degrees in hard driving but it is pretty consistent or dependent on the driving I'm doing.
I was planning to send mine out over the winter to get heat shielded but I think I will skip that now as I do not see the need. The additional flow and lack of the OAP structure keeps the temps down IMO.
For non heat shielded Kline owners, can you tell me how much your rear tire pressure increases from a spirited drive? For example, on my stock car, rear tires are 35 psi cold. When I go on a spirited drive the rear tires heat up to 40-41psi. I’m trying to figure out with the Kline without heat shield if the tires will heat up even more or will it be the same.
My cold pressures are same all round. Before having shielded OAP's the rear always ended up around 5% higher after 20 mins of driving. With shielded OAP's there is no variance between front and rear temps.
My cold pressures are same all round. Before having shielded OAP's the rear always ended up around 5% higher after 20 mins of driving. With shielded OAP's there is no variance between front and rear temps.
How are you measuring temperature differentials? Do you mean PSI differentials?
How are you measuring temperature differentials? Do you mean PSI differentials?
Yes, PSI delta (heat = higher PSI). So if I start at 32 PSI and goes to 34 after driving. It will be 34 all corners, where as used to be more like 34 front and 35/36 rear. I never ran OEM OAP's, so no idea what their delta was. With Soul resonated with JetHot the rear still ran higher PSI. With Kline shielded OAP's there's no delta front vs rear.
Yes, PSI delta (heat = higher PSI). So if I start at 32 PSI and goes to 34 after driving. It will be 34 all corners, where as used to be more like 34 front and 35/36 rear. I never ran OEM OAP's, so no idea what their delta was. With Soul resonated with JetHot the rear still ran higher PSI. With Kline shielded OAP's there's no delta front vs rear.
Oh ok, makes sense. There is more weight on the rear so isn't unexpected to have higher PSI delta there.
My GT4 was on the lift today for camber plates installation, and my installer didn't notice any cracks in my SS unshielded Kline exhaust. I've been tracking 2-3/month in 100+ degrees this past summer.
My GT4 was on the lift today for camber plates installation, and my installer didn't notice any cracks in my SS unshielded Kline exhaust. I've been tracking 2-3/month in 100+ degrees this past summer.
So...just to reconfirm...no noticeable (excessive) heat damage in the rear wheel well area...discoloraton, etc, from using the unsheilded Kline system??? Thanks.
So...just to reconfirm...no noticeable (excessive) heat damage in the rear wheel well area...discoloraton, etc, from using the unsheilded Kline system??? Thanks.
My GT4 was on the lift today for camber plates installation, and my installer didn't notice any cracks in my SS unshielded Kline exhaust. I've been tracking 2-3/month in 100+ degrees this past summer.
I would not have expected cracking in the actual exhaust. I believe most the discussion around the concerns of an unshielded aftermarket OAP was related to the high heat exposure to surrounding suspension components and tires, not the actual exhaust itself cracking. In fact I'd think exhaust/pipe heat shield wrap, while it would protect other components, would in fact cause the actual exhaust itself to retain more heat in the system. It's an interesting debate.
10-24-2023, 06:55 PM
