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ideola
Joined: 01 Oct 2004 Posts: 15548 Location: Spring Lake MI
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Posted: Tue Feb 03, 2009 4:01 am Post subject: |
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I've been doing some analysis of my project budget based on what I have already spent + what I plan to spend to complete the project. Here is an interesting result.- ~40% of the budget is earmarked for drive train development (i.e. head, block, turbo, cooling, engine management, and transaxle)
- ~20% of the budget is earmarked for suspension and brakes
- ~40% of the budget is earmarked for body, chassis & electrical
_________________ erstwhile owner of just about every 924 variant ever made |
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gegge
Joined: 27 Jul 2007 Posts: 1124 Location: Sweden
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Posted: Wed May 20, 2009 8:11 pm Post subject: |
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I would like to ask why you have ruled out knife-edging and further lightening of the crank in your ultimate-build 924?
Not for comfort or streetability I guess..? _________________ Carl Fredrik Torkildsen
924 turbo -81 Carrera GT RESTOMOD
924 turbo -80 Dolomite De Luxe
924 -85 DP kit, BBS RS, M030 and tuned engine
924s -86 Black on black turbo with Fuchs |
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Scorpio
Joined: 05 Jul 2007 Posts: 1957 Location: Brisbane, Australia
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Posted: Wed May 20, 2009 8:27 pm Post subject: |
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ideola wrote: | I've been doing some analysis of my project budget based on what I have already spent + what I plan to spend to complete the project. Here is an interesting result.- ~40% of the budget is earmarked for drive train development (i.e. head, block, turbo, cooling, engine management, and transaxle)
- ~20% of the budget is earmarked for suspension and brakes
- ~40% of the budget is earmarked for body, chassis & electrical
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Dan more work and less calculating time _________________ 1979 NA
MS1..EFI..
GARRETT T25 TURBO
BILSTEIN SHOCKS
GT BASED CUSTOM BODYKIT
Brisbane , Australia
Think mean think fast
all youll see is
my Porsches Arse!!! |
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ideola
Joined: 01 Oct 2004 Posts: 15548 Location: Spring Lake MI
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Posted: Wed May 20, 2009 9:10 pm Post subject: |
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gegge wrote: | I would like to ask why you have ruled out knife-edging and further lightening of the crank in your ultimate-build 924?
Not for comfort or streetability I guess..? |
It was a combination of factors, but primarily because I am definitely going with the Pace Products dry sump system (just placed the order this morning), which makes knife-edging somewhat of a moot point; and also because I was originally planning to run the lightened flywheel. The add'l cost was also a concern, although not the deciding factor...it was more of a "bang for the buck" decision.
Now that the Fidanza is officially off the table, it reopens the discussion around lightening the crank. Since I no longer need to wait for the flywheel, my plan now is to take the entire rotating assembly in to my machinist for balancing. I will consult with them at that time regarding lightening on the crank AND the stock flywheel during the balancing process.
Scorpio wrote: | Dan more work and less calculating time |
Haha, nice one Actually, the spreadsheet does all the calculating. I'm tracking a planned vs. actual budget on this project, so it's simple to get these numbers. Besides, I'm not always at the garage, so working on things like the budget and research keeps me interested and engaged with the project when I'm away from it and not able to get my hands dirty.
The numbers have fluctuated a bit based on some opportunistic acquisitions recently on the body. Here's the current projection:
43.8% => Drivetrain
20.1% => Suspension & Brakes
36.1% => Chassis, Body & Electrical _________________ erstwhile owner of just about every 924 variant ever made |
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ideola
Joined: 01 Oct 2004 Posts: 15548 Location: Spring Lake MI
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Posted: Thu May 21, 2009 4:27 am Post subject: |
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Some of the last major pieces to the puzzle are falling into place now:- Pace Products Dry Sump system is on order, ETA is unknown
- The Davies Craig cooling system components are on order and should arrive within days (EWP115, EBP for the turbo, and 12" thermatic fan)
- Complete Tilton 3-pedal assembly, along with master cylinders, remote bias adjuster, and 3-chamber reservoir are on order
- Elephant Racing geometry correcting tie rod kit is on order
- The rest of the suspension bushings, along with the rotors and pads are on order
- I've found a very nice, compact 160A alternator for use with my planned axle-driven setup that is on order and should arrive any day now. Photos and source to follow soon.
- I've also found a lightweight gear reduction starter for the 944 that will work for this application, should be on order this week
_________________ erstwhile owner of just about every 924 variant ever made |
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Scorpio
Joined: 05 Jul 2007 Posts: 1957 Location: Brisbane, Australia
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Posted: Thu May 21, 2009 8:52 am Post subject: |
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160 Amp alternator ? you taking your UWB car to a sound off hey? _________________ 1979 NA
MS1..EFI..
GARRETT T25 TURBO
BILSTEIN SHOCKS
GT BASED CUSTOM BODYKIT
Brisbane , Australia
Think mean think fast
all youll see is
my Porsches Arse!!! |
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ideola
Joined: 01 Oct 2004 Posts: 15548 Location: Spring Lake MI
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Posted: Thu May 21, 2009 8:54 am Post subject: |
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Scorpio wrote: | 160 Amp alternator ? you taking your UWB car to a sound off hey? |
haha, maybe
Actually I picked it because it provides 115A at idle. Since I'm going with an axle driven alt, I wanted one that could charge most everything at low RPM for those rare occasions when I'm in stop & go Also a consideration for the electronics I plan to add (ECU, dash display, PLX stuff, and hopefully eventually data loggers, camera gear, etc.) _________________ erstwhile owner of just about every 924 variant ever made |
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FSMITH010
Joined: 24 Apr 2009 Posts: 101 Location: Los Angeles, CA
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Posted: Thu May 21, 2009 9:45 am Post subject: |
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100% = ? |
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ideola
Joined: 01 Oct 2004 Posts: 15548 Location: Spring Lake MI
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Posted: Thu May 21, 2009 9:49 am Post subject: |
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FSMITH010 wrote: | 100% = ? |
TBD. A lot. Enough to buy a new car (but not a new Porsche). I'll reveal the total plus the breakdown by "repair group" once the car is at or near completion. _________________ erstwhile owner of just about every 924 variant ever made |
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peterld
Joined: 10 Dec 2006 Posts: 946 Location: Noosa Heads QLD Australia
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Posted: Thu May 21, 2009 12:25 pm Post subject: |
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But don't ever let the missus see it!!! |
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FSMITH010
Joined: 24 Apr 2009 Posts: 101 Location: Los Angeles, CA
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Posted: Thu May 21, 2009 12:28 pm Post subject: |
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peterld wrote: | But don't ever let the missus see it!!! |
Queen: OFF WITH HIS HEAD!!! |
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bass gt
Joined: 02 Dec 2004 Posts: 971 Location: Johannesburg for now!!
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Posted: Thu May 21, 2009 4:35 pm Post subject: |
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Dan,
Well done on going the Dry Sump route. If you need any pointers, or have questions, you know my mail addy.
Steve _________________ Front Wheel Drive is the Devil's work. |
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john h
Joined: 06 Nov 2002 Posts: 827 Location: Wellington New Zealand
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Posted: Thu May 21, 2009 8:36 pm Post subject: |
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Dan,
I'm interested in how you are going to keep the alternator from overspeeding when you're running it off the axle.
My calculations (which couldbe wrong) showed that at 160kpm (which I get to at some circuits) the alternator would be turning over at 30,000 which is about 12,000 more than Bosch suggest. That was majorily under driving the alternator. _________________ Remember a Porsche is not just for Christmas,
if you take it to pieces slowly it can provide anguish all year long! |
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ideola
Joined: 01 Oct 2004 Posts: 15548 Location: Spring Lake MI
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Posted: Thu May 21, 2009 9:18 pm Post subject: |
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John, that's a good question, and truthfully, I haven't really thought that far ahead. Most of my track time will be at Waterford Hills, so getting up to 100MPH / 160 KPH probably won't happen often or for extended periods.
I'll contact the supplier of the alternator and find out what their recommendation is. To an extent, I think some of the issues could be solved with a larger pulley on the alt itself. I really don't want to have to get into a clutched pulley, but I'll go down that path if I have to.
I wish we had more details on Frank's D-Prod setup. _________________ erstwhile owner of just about every 924 variant ever made |
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ideola
Joined: 01 Oct 2004 Posts: 15548 Location: Spring Lake MI
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Posted: Thu May 21, 2009 9:46 pm Post subject: |
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Also, I should mention that I'm not going to be using a Bosch unit. The supplier I contacted recommended a modified high-output version Delco CS130D. Unlike the CS144 discussed elsewhere here, the CS130D has ball bearings rather than needle bearings, which according to my supplier makes it more durable and resistant to the abuse it will be subjected to in the rear of the car.
I explained my application in detail, including the rear-transaxle mounting and projected size of my custom drive pulley, and the CS130D was his top recommendation. Bear in mind, because my setup is completely custom, I wasn't constrained to any particular configuration. The CS130D is a very small and compact package. As a second option, they also mentioned the AD244, which is a large case version of the CS130.
In any event, I'll do some investigation regarding acceptable RPM range. The good thing is that I have not yet made my pulley. With the piece of raw aluminum I have, I can go anywhere from ~7" to ~4" depending on what we conclude is suitable for the alternator. _________________ erstwhile owner of just about every 924 variant ever made |
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