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Shaping up a new-to-me 07 GT3

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Old 06-05-2014, 10:02 AM   #31
widers911
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Great write up! Congrats on the new ride and bringing her back to form
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Old 06-05-2014, 12:12 PM   #32
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Great write up! Congrats on the new ride and bringing her back to form
Thanks!
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Old 06-05-2014, 01:38 PM   #33
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Default Unexpected Airbox Drama

It had never occurred to me that the engine compartment electric fan pulls so much air that it sucks the air right out of the airbox which freaks out the MAF sensor causing the engine to stall at idle under certain conditions. It no problem at all once the car is up to speed because the fan shuts off, but its an annoyance when sitting at a traffic light or on grid with the already lumpy idle of these cars. This is a problem I created by cutting the left side inlet too close to the fan so I need to deal with it.

My options are:
A) Buy a Cup or RS decklid - no mula for that
B) Delete the fan like a Cup car - not quite ready to that yet since this is still a street car (BTW, it has been my theory, only a theory, that the fan contributes to coolant fittings popping out as the rapid cooling cycles hardens the pliable glue. I have never seen the fittings come off on a Cup/R since year 2000...but I also think that it is a necessary evil for sitting in traffic.
C) Make some kind of diffuser to eliminate turbulence in the airbox/MAF sensor

I'll go with C.

So for this portion of the project, I got a universal kevlar louver from a race car constructor supply company(these louvers are commonly used on prototype racers) to carve out to a half-height scoop. This scoop(diffuser) is placed inside the external decklid scoop. Plenty of air flows over this half-height into the left side airbox inlet at high speeds while forcing the fan to draw from the outside. Works like a charm! No more stalling!
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Old 06-05-2014, 03:23 PM   #34
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What was stock HP on the 997.1 GT3; 415? And would you still assume that much power with what is going on with the intakes and aftermarket/OEM tinkering still?

Were most the Mods done on the suspension?

Measured at the wheels, the powertrain is only soaking up 13.25%. So much of that rule of thumb of 20 percent loss - Porsches just don't lose that much power before hitting the wheels!

Good work, reminds me of watching Edd China on the TV Show "Wheeler Dealers" on Velocity with that work you did on the intakes. That's some kick-*** work; and keep them clean too. All's you need is some elbow grease and bumper fluid.
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Old 06-05-2014, 05:10 PM   #35
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What was stock HP on the 997.1 GT3; 415? And would you still assume that much power with what is going on with the intakes and aftermarket/OEM tinkering still?

Were most the Mods done on the suspension?

Measured at the wheels, the powertrain is only soaking up 13.25%. So much of that rule of thumb of 20 percent loss - Porsches just don't lose that much power before hitting the wheels!

Good work, reminds me of watching Edd China on the TV Show "Wheeler Dealers" on Velocity with that work you did on the intakes. That's some kick-*** work; and keep them clean too. All's you need is some elbow grease and bumper fluid.
350-360 hp at the wheels is what the .1 cars make on our DynoJet. I am not one to spend crazy money(which I don't have) and lose sleep over chasing a few horsepower on a used car as long as the engine is safe to run. Just happy that its in the range and it made a noticeable improvement after the work. However, I do have a different mentality when working on competitive race cars for the team and for customers.

15% loss is about the average standard from "actual" wheel to factory "advertised" crank on a DynoJet.. But % is not exactly consistent from one model car to another even within the same brand. So, to me, its only relevant to compare different runs/cars on the same dyno.

Currently the car has front & rear LCAs, .2 front springs, TPC front bar, .1 rear bar, and TPC rear toe links. I am going to change shocks and springs soon.

Thanks!
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Old 06-05-2014, 06:19 PM   #36
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Tom,

This is really cool to see. I saw you and the car at the Potomac DE a month or so ago, but we didn't get to talk. You were busy with your instructor. I am off to the Canadian GP, but when i get back there is something I need to call and chat with you about. Have a great weekend!

-KJ
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Old 06-05-2014, 06:42 PM   #37
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Great thread! Love to see these great cars find their way into the hands of competent and knowledgeable owners.
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Old 06-05-2014, 07:00 PM   #38
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Fantastic job Tom!
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Old 06-05-2014, 07:59 PM   #39
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Great thread! Love to see these great cars find their way into the hands of competent and knowledgeable owners.
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Fantastic job Tom!
Thank you guys!
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Old 06-05-2014, 08:01 PM   #40
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Originally Posted by KJinDC View Post
Tom,

This is really cool to see. I saw you and the car at the Potomac DE a month or so ago, but we didn't get to talk. You were busy with your instructor. I am off to the Canadian GP, but when i get back there is something I need to call and chat with you about. Have a great weekend!

-KJ
KJ! Thanks for the note! Have fun at the GP! Talk soon.
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Old 06-05-2014, 08:25 PM   #41
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Nice job rescuing this beast and bringing her back to life. Good luck with the project and I look forward to your updates.
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Old 06-05-2014, 11:20 PM   #42
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Thanks Tom, just wanted to make sure!! Glad to see the car is coming along. Hope to see it out at summit soon.
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Old 06-06-2014, 12:34 AM   #43
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Hi Tom, this is a terrific write up! Wishing you a speedy, easy re-build. I am excited to see the finished product. Keep well.
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Old 06-06-2014, 12:52 AM   #44
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Hey Tom. Well done and thanks for sharing. Sweat equity and intellegent solutions over just throwing $$$$$$ at a project always wins over in my books.
Quesion: what was the name of the product you used to clean the parts? Simple green and.......?

Brent
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Old 06-06-2014, 04:31 AM   #45
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Nice work !!

have you any other pics of your setting car stand ?

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