UDP and 111 degree heat

[particlewave]

Originally Posted by Porsche9

I figured once it got real hot I'd really know if the UDP would cause issues. Well today it hit 111 and when it gets that hot the temperature close to the asphalt is even higher and car interior temps easily can get into the 130s. My poor Boxster was parked for a few hours this late afternoon in full sun and after getting in the car the A/C worked to cool the car quickly and the coolant temp never went past 8. This was all while sitting in heavy traffic. This was the first hot day and tomorrow it is supposed to hit 115. Thought some of you might care to know if you were debating this mod or have it and wondered if it would stand up to extreme heat.

Great info! I've been back and forth on doing the UDP, but worry about the AC and engine temp (mine sits on the middle of the "0" on hot days in traffic).
I think it may be time to flush the coolant and replace the water pump anyway, so I may just add this to the list

[rfuerst911sc]

Thanks for posting your results. I'm scheduled for 8/19 to have Jake install a UDP and do a dyno run to see what it added for hp/torque.

[Porsche9]

Originally Posted by rfuerst911sc

Thanks for posting your results. I'm scheduled for 8/19 to have Jake install a UDP and do a dyno run to see what it added for hp/torque.

Definitely report back the results. I'm guessing 5 to 7 hp up top based on my butt dyno.

[rfuerst911sc]

Originally Posted by Porsche9

Definitely report back the results. I'm guessing 5 to 7 hp up top based on my butt dyno.

Will do. I have a baseline dyno run from Jake when I originally picked up the car. Since then I have added headers/performance cats, eliminated the rear cats and added a Dansk bananna muffler. When I get to Jakes on 8/19 we will do another dyno run to see what effect the exhaust changes made. Then he will install the UDP and we'll do another dyno run to see what changes that made. I will share all that data with the crowd here it's just good info to know.

[Brad Roberts]

Your car lies to you.. (not joking) what Porsche has the gauge reading? and what the actual temp is? Two different things. Plug in with a PIWIS one day and look at both. You'll see. The BMW guy's deal with the same issue Porsche *wants* you to believe what is on the gauge. It's BS after 195.

I mount data temp sensors within a few inches of the factory temp sensor.. so I have other info coming in. I regular see 205-215 in 2.5 race cars with 3rd radiator. The BoxsterS cars with the 3.2 will go 220 all day (but read a nice steady 195 on the gauge)

The 987's are even worse

[Porsche9]

Originally Posted by Brad Roberts

Your car lies to you.. (not joking) what Porsche has the gauge reading? and what the actual temp is? Two different things. Plug in with a PIWIS one day and look at both. You'll see. The BMW guy's deal with the same issue Porsche *wants* you to believe what is on the gauge. It's BS after 195.

I mount data temp sensors within a few inches of the factory temp sensor.. so I have other info coming in. I regular see 205-215 in 2.5 race cars with 3rd radiator. The BoxsterS cars with the 3.2 will go 220 all day (but read a nice steady 195 on the gauge)

The 987's are even worse

Interesting. Do you have experience with UDPs in terms of impact on coolant temps? Guessing a lot of the 2.5 race cars have UDPs and if coolant temps was a problem would the stock pulley be better or does it even matter? Thanks.

[Porsche9]

Originally Posted by particlewave

Great info! I've been back and forth on doing the UDP, but worry about the AC and engine temp (mine sits on the middle of the "0" on hot days in traffic).
I think it may be time to flush the coolant and replace the water pump anyway, so I may just add this to the list

Mine might touch the 0 when the AC is off but like yours the fan kicks in and it goes back down the the middle of the 8. I replaced my water pump back in December plus on the coolant refill (factory coolant) I added a bottle of water wetter. You clean your radiators? They often get filled with crap and that can impact coolant temps.

[dijinn]

If you don't mind me asking, what does Jake charge to purchase and install the UDP? I'm bringing my Boxster in to have the IMS solution installed the week after you (8/25) and was thinking about having the UDP installed.

Definitely interested in what your dyno results show as I have very similar mods done to my 2004 Boxster.

[rfuerst911sc]

Originally Posted by dijinn

If you don't mind me asking, what does Jake charge to purchase and install the UDP? I'm bringing my Boxster in to have the IMS solution installed the week after you (8/25) and was thinking about having the UDP installed.

Definitely interested in what your dyno results show as I have very similar mods done to my 2004 Boxster.

I honestly just talked " rough " numbers with Jake so I don't feel comfortable giving out the price. And I'm a repeat customer so don't know if I'm getting any kind of a break. I'm using Jake mainly because of his and his teams expertise. There are plenty of shops in the Atlanta area that could install the UDP but I trust Jake and his team to do it right the first time, if that costs a little more so be it. He's never done me wrong why shop elsewhere ? Good luck with yours.

[Brad Roberts]

Interesting. Do you have experience with UDPs in terms of impact on coolant temps? Guessing a lot of the 2.5 race cars have UDPs and if coolant temps was a problem would the stock pulley be better or does it even matter? Thanks.

It works great for cooling the race cars!!

View it this way: Race car = high RPM all the time. Stock pulley? moves the water too fast through the radiators. UDP slows the water down and gives it more time to cool.

Now? How do you think that would work for you on the street? Too slow at idle

I use 2 different pulley sizes. One for street and one for race. 4inch and 5 inch.