Spec Boxster Build - Page 12 - 986 Forum - The Community for Porsche Boxster & Cayman Owners

cmacduff · 12-14-2014, 10:32 AM

Forgot 1st page...

thstone · 12-14-2014, 03:27 PM

Quote:

Originally Posted by cmacduff

Sorry for the delay. Here is the build list for my oil cooler and a picture of it. The fan is actually underneath the cooler and pulls air through a hole in the trunk and exhausts to the street. There is also obviously a cut out in the bottom of the trunk to allow for this.

Thanks Chris - any temp data that you'd like to share, before vs after? That is a serious cooler!

thstone · 12-14-2014, 03:30 PM

My younger son was home for the holidays from college so I talked him into helping me start to swap out the transmission. We got the lower braces, rear sway bar, and entire exhaust system removed in about 90 mins.

seningen · 12-14-2014, 03:53 PM

Quote:

Originally Posted by cmacduff

Sorry for the delay. Here is the build list for my oil cooler and a picture of it. The fan is actually underneath the cooler and pulls air through a hole in the trunk and exhausts to the street. There is also obviously a cut out in the bottom of the trunk to allow for this.

Thank you sir!

jaykay · 12-14-2014, 08:22 PM

Quote:

Originally Posted by thstone

Hah! That is pretty funny! Let me know what we're going to fix next...

Sorry to hear that the 951 might go but you'll love a Spec Boxster!

Ah em thinking of tracking a 951 this coming season. ...you guys are making nervous

seningen · 12-14-2014, 08:31 PM

Quote:

Originally Posted by jaykay

Ah em thinking of tracking a 951 this coming season. ...you guys are making nervous

Do your homework. Lots of info out there.
Keep your oil cool, baffle your oil pan.

M

stephen wilson · 12-15-2014, 08:46 AM

macduff, Where is the cooler fresh air inlet ? The trunk is sealed pretty well, a fan can't move air without a flow path.

cmacduff · 12-15-2014, 09:06 AM

A hole was cut in the middle of the trunk and a custom scoop made to funnel air in to it. We did testing on the air flow by taping the strands of a mop from the back of the car over the inlet for the air cooler before making the scoop and used a go-pro to film the strands and see where the air flow was at race speeds. The cooler fan actually did suck the air in without the scoop so we tested some sessions with a "sample scoop" made out of an in box that you would see in an office on the wall. We used double sided tape and zip tied it through the mesh in the oil cooler in let. Temperatures were improved by 10 degrees with the scoop so even though air flowed without it was improved with the scoop. I'll post some pictures of that and also some screen shots of the temperature differences.

stephen wilson · 12-15-2014, 09:14 AM

Cool, glad to see you did some testing.

seningen · 12-15-2014, 10:25 AM

Quote:

Originally Posted by cmacduff

A hole was cut in the middle of the trunk and a custom scoop made to funnel air in to it. We did testing on the air flow by taping the strands of a mop from the back of the car over the inlet for the air cooler before making the scoop and used a go-pro to film the strands and see where the air flow was at race speeds. The cooler fan actually did suck the air in without the scoop so we tested some sessions with a "sample scoop" made out of an in box that you would see in an office on the wall. We used double sided tape and zip tied it through the mesh in the oil cooler in let. Temperatures were improved by 10 degrees with the scoop so even though air flowed without it was improved with the scoop. I'll post some pictures of that and also some screen shots of the temperature differences.

I'm assuming when you say trunk -- in this case you mean trunk lid?
Definitely like to see the pix --

I was thinking something similar -- probably looks something like a 930 intercooler.

Mike

specboxCO · 12-15-2014, 02:21 PM

Quote:

Originally Posted by cmacduff

A hole was cut in the middle of the trunk and a custom scoop made to funnel air in to it.

This mod is not going to be spec box legal, otherwise everyone would be cutting holes in their trunks for weight saving. I would talk to your local scrutes about how (if) you can get air in to the trunk and comply with the rules.

thstone · 12-15-2014, 08:11 PM

Quote:

Originally Posted by specboxCO

This mod is not going to be spec box legal, otherwise everyone would be cutting holes in their trunks for weight saving. I would talk to your local scrutes about how (if) you can get air in to the trunk and comply with the rules.

I thought that I had mentioned in an earlier post that this mod isn't BSR/SPB legal. If not, sorry.

Chris' Boxster is an S-model anyway, so he runs in the GT class where mods like this are allowed.

With that being said, you have to admit that his approach to engine cooling is serious!

cmacduff · 12-16-2014, 08:48 PM

This is true. For those of you spec guys this mod won't be legal. My POC class is strictly power to weight. Anything else goes so if you have a big pocket book you can off set or compliment your driving. My car is in GT5 and the classes go 6-1 so I am on the bottom end and that is expensive enough.

That being said to answer Sennigen's question about exact temps when I was at AA speedway in Fontana in August ambient temps were 95 give or take. Without the cooler my oil temps were over 250 degrees by the end of a session. At Willow Springs in early September the temps were similar and my oil temps were 225 after a session. When we tested the in box file folder it lowered them another 10 degrees so 215 at the end of a session. I have attached a picture of the scoop and the hole in the trunk. The final scoop was just finished so I don't have data on it yet but my assumption is it will perform just as well as the in box file folder.

jaykay · 12-16-2014, 10:47 PM

Awesome set up....love it! Jeez I really need to move out to SoCal! Do you have a transmission oil cooler set up under there as well?

stephen wilson · 12-17-2014, 04:08 AM

That's looks better than I thought it would, painted black it would blend in well. Still pretty much a track only mod, I don't think golf clubs will fit on top of that !

cmacduff · 12-17-2014, 08:27 AM

Jus for clarification in my last post the oil cooler was added after AA speedway and before the Willow Springs event. Sure you figured that out.....

Full picture of my car below. 2001 Boxster S

cmacduff · 12-17-2014, 08:29 AM

No transmission cooler yet. I try not to run too much in the summer any more. It's just too hot here and heat is a killer!

com3dorm3 · 12-17-2014, 10:06 AM

Car and mods look awesome!

The Radium King · 12-17-2014, 10:36 AM

are those pole positions - did you see the recent fia ruling on them?

seningen · 12-17-2014, 11:34 AM

Quote:

Originally Posted by cmacduff

This is true. For those of you spec guys this mod won't be legal. My POC class is strictly power to weight. Anything else goes so if you have a big pocket book you can off set or compliment your driving. My car is in GT5 and the classes go 6-1 so I am on the bottom end and that is expensive enough.

That being said to answer Sennigen's question about exact temps when I was at AA speedway in Fontana in August ambient temps were 95 give or take. Without the cooler my oil temps were over 250 degrees by the end of a session. At Willow Springs in early September the temps were similar and my oil temps were 225 after a session. When we tested the in box file folder it lowered them another 10 degrees so 215 at the end of a session. I have attached a picture of the scoop and the hole in the trunk. The final scoop was just finished so I don't have data on it yet but my assumption is it will perform just as well as the in box file folder.

Great data -- and this was what I was envisioning -- I would think that the scoop would do one of two things -- elevate the need for the fans (at any reasonable speed), and/or add extra drag.

Otherwise I like it.

Mike