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Cedric
Joined: 27 Aug 2004 Posts: 2614 Location: Sweden
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Posted: Mon Sep 09, 2013 9:23 pm Post subject: |
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DutchPug wrote: | Nice results George.
They probably gave you a print with power at the wheels and torque at the flywheel, that is why the torque and power numbers don't add up.
According to your torque figures you have around 256 hp at the engine. That is a substantial increase over stock power output. |
Sounds reasonable, 260hp should fell pretty darn fast in a 924
If you want to compare your acceleration results I have a full load run made with race chrono on an air strip (more or less standard euro s2 engine and not lightened car), although a pretty careful start (don't like changing clutch ). Could be a nice performance comparison _________________ 1980 924 Turbo
www.instagram.com/garagecedric/ |
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GeorgeV
Joined: 14 Mar 2010 Posts: 306 Location: Brisbane, Australia
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Posted: Mon Sep 09, 2013 10:50 pm Post subject: |
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Cédric wrote: |
Sounds reasonable, 260hp should fell pretty darn fast in a 924
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As I said before, the acceleration is instantaneous and brutal. I have no complaints with power levels. Also the sound of the turbo spinning fast in 3rd and 4th is heaven! _________________ 1981 932 with mods:
http://www.924board.org/viewtopic.php?t=37921 |
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WEASEL149
Joined: 19 Aug 2005 Posts: 595 Location: UK, Sheffield
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Posted: Tue Sep 10, 2013 12:15 am Post subject: |
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DutchPug wrote: | According to your torque figures you have around 256 hp at the engine. That is a substantial increase over stock power output. |
Yes, this is what I estimated also, 255-260hp at flywheel.
Numbers mean nothing if the car feels slow, and to be honest rolling roads are a way to compare, not to accurately measure.
So going by a 50% increase and the butt dyno, I'd say that's a great result.
300hp is all good and well if you're confident of the engine's internals.
Your power level is sensible for an engine that hasn't been rebuilt and a stock clutch. You can enjoy a quick car without worrying if the engine is going to let go, and if it does, you can always rebuild the engine accordingly with a higher power in mind.
This build should be applauded rather than criticised. Not many people go this far and come out the other end with a running and reliable motor.
These cars are a hobby. When do we ever consider them 'finished'. The journey is a big part of the enjoyment as well as driving (for me at least).
What's wrong with 130hp per litre from a 30+yr old car? Plus ~280lb/ft torque is a sizeable increase
_________________ 1979 UK 932 |
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morghen
Joined: 21 Jan 2005 Posts: 8884 Location: Romania
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Posted: Tue Sep 10, 2013 1:38 am Post subject: |
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WEASEL149 wrote: | This build should be applauded rather than criticised. Not many people go this far and come out the other end with a running and reliable motor. |
Agree.
Didnt mean to bring any critique...was just wondering about the numbers. _________________ https://www.the924.com |
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WEASEL149
Joined: 19 Aug 2005 Posts: 595 Location: UK, Sheffield
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Posted: Tue Sep 10, 2013 1:56 am Post subject: |
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morghen wrote: | Agree.
Didnt mean to bring any critique...was just wondering about the numbers. |
I can see what you were getting at Morghen and I agree that CIS is more than capable of 250hp+ numbers, especially with the K27.
George's motor is healthy now but the foundation has been laid in place for constant improvement with EFI and standalone.
300hp flywheel is definitely in reach with that spec.
E85 is ideal. Pity it's not widely available over here in the UK, otherwise that would be my route. The power from timing alone would probably make it worth it. _________________ 1979 UK 932 |
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Cedric
Joined: 27 Aug 2004 Posts: 2614 Location: Sweden
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Posted: Tue Sep 10, 2013 3:10 am Post subject: |
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Most importantly, where are the youtube vids ??????
_________________ 1980 924 Turbo
www.instagram.com/garagecedric/ |
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GeorgeV
Joined: 14 Mar 2010 Posts: 306 Location: Brisbane, Australia
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Posted: Tue Sep 10, 2013 3:02 pm Post subject: |
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Cédric wrote: | Most importantly, where are the youtube vids ??????
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I'm sorry, but I don't have the equipment to make vids of the car while driving. _________________ 1981 932 with mods:
http://www.924board.org/viewtopic.php?t=37921 |
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Joes924Racer
Joined: 03 Nov 2002 Posts: 11964 Location: Oregon, Denver Colorado native!
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Posted: Wed Sep 11, 2013 4:24 pm Post subject: |
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Oh no we needs vids.... That thing is awesome.very nice. _________________ 1979 porsche 924 Na
1980 porsche Turbo 931GT Replica
Have u ever driven a turbo. |
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coldwarvet
Joined: 13 Jun 2014 Posts: 51 Location: near sandy oregon
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Posted: Mon Jun 16, 2014 11:41 am Post subject: turbo down under |
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....so refreshing to see THOUGHT applied to a car created in afterthought....
......just beautiful!....you "diggers" are always coming up with the most innovative stuff!...
good go! |
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GeorgeV
Joined: 14 Mar 2010 Posts: 306 Location: Brisbane, Australia
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Posted: Wed Jul 02, 2014 9:47 pm Post subject: Re: turbo down under |
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coldwarvet wrote: | ....so refreshing to see THOUGHT applied to a car created in afterthought....
......just beautiful!....you "diggers" are always coming up with the most innovative stuff!...
good go! |
Thanks for your kind words. I'm planning on more performance mods soon. _________________ 1981 932 with mods:
http://www.924board.org/viewtopic.php?t=37921 |
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Joes924Racer
Joined: 03 Nov 2002 Posts: 11964 Location: Oregon, Denver Colorado native!
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Posted: Sun Aug 24, 2014 1:43 pm Post subject: |
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Wow. I have to give the high fives on your build. Its darn cool. _________________ 1979 porsche 924 Na
1980 porsche Turbo 931GT Replica
Have u ever driven a turbo. |
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GeorgeV
Joined: 14 Mar 2010 Posts: 306 Location: Brisbane, Australia
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Posted: Wed Oct 01, 2014 10:15 pm Post subject: |
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Joes924Racer wrote: | Wow. I have to give the high fives on your build. Its darn cool. |
Thanks, Joe. _________________ 1981 932 with mods:
http://www.924board.org/viewtopic.php?t=37921 |
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gabo931
Joined: 26 Feb 2015 Posts: 21 Location: Puerto Rico
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Posted: Wed Jul 29, 2015 2:53 am Post subject: |
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GeorgeV wrote: | Well, the mods are done and the car is running.
Here's the alternator. Went through 3 of these before settling on a race one. The others could not take the heat. Only charges above 1500rpm, so I need to be careful. The alternator sits between the inlet manifold and the AC condenser.
This is the relay for IC pump.
Bigger breather to reduce blowby.
The finished product.
After many hours on the dyno this is the result.
The car goes like a rocket. When you plant your foot, the front lifts like its going to mono and the acceleration is instantaneous and brutal. You can't hold any gear for very long otherwise you hit the rev limiter very easy - mechanic recommends keeping revs to 5000 due to age of the engine. The boost is set at 16psi, but if you plant it it will max out at 19psi as there are no flow restrictions and the wastegate stuggles to limit the boost. Intake temps after the IC are running at about 40deg cel on a 25deg cel day. The coolant temps stay between 85deg and 90deg. It starts first go, idles beautifully and is very easy to drive in a high gear if you're just tootling around town. The increase is low down torque is very noticeable and makes the car very easy to drive when going easy.
I have a few other things to get done but they are just window dressing. I'm also thinking of going to E85 as it will run cooler, which will help with the temps in Brisbane, and mechanic reckons it will probably increase kw to 200. We'll see.
I want to thank everyone on the board for their inspiration. I would never have undertaken such a venture without the mods I've seen done here on the board. I would not recommend my approach unless you're prepared to spend lots of money. Once you go down this approach, you have to change everything. I think I read a post the other day by Morghen saying exactly this, and my experience backs that up.
Cheers,
G |
Hey Man great Build!
May i have more information on the alternator setup? I am planning to build intake manifold with the throttle at the same place as yours but i am having trouble deciding where to place the alternator.
Thanks! _________________ 1980 931 M471 LSD |
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GeorgeV
Joined: 14 Mar 2010 Posts: 306 Location: Brisbane, Australia
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Posted: Thu Jul 30, 2015 11:10 pm Post subject: |
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gabo931 wrote: |
Hey Man great Build!
May i have more information on the alternator setup? I am planning to build intake manifold with the throttle at the same place as yours but i am having trouble deciding where to place the alternator.
Thanks! |
The alternator sits on top of the AC compressor and bolts into the block. It is run by the compressor. This was only one of two places to put the alternator, the other was underneath the engine near the starter motor. Because the engine generates a lot of heat, we had to use a race alternator that could take the heat. Although it originally charged only over 1500 rpm, I have had a pulley made for the AC compressor that is the largest that will fit. The alternator now charges the battery at idle.
Let me know if you have any other questions. _________________ 1981 932 with mods:
http://www.924board.org/viewtopic.php?t=37921 |
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brealytrent
Joined: 28 Dec 2008 Posts: 414 Location: Goldsboro, NC
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Posted: Sun Aug 02, 2015 2:27 pm Post subject: |
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How 'bout a video of this beast? _________________ 1977 Porsche 924 - sold
1980 Porsche 931 - sold
1984 Porsche 928 'S2' Euro - sold
2016 Ford Fiesta ST - sold
2009 Porsche Cayman |
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