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nickthompson
Joined: 26 Mar 2013 Posts: 873 Location: Central Georgia
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Posted: Thu Jul 23, 2015 8:30 am Post subject: |
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Just get an Audi 20 valve inline five and do an engine swap. |
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leadfoot
Joined: 11 Dec 2002 Posts: 2222 Location: gOLD cOAST Australia
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Posted: Thu Jul 23, 2015 1:58 pm Post subject: |
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Nitrous _________________ 1981 ROW 924 Turbo -
carbon fiber GT mish mash
LS1 conversion in progress... |
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chris79
Joined: 29 Jan 2014 Posts: 551 Location: milan
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Posted: Fri Jul 24, 2015 12:04 am Post subject: |
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Ah it's more difficult to increase turbo pressure on 924 turbo that on 924 na + efi ? _________________ Porsche 924 2.0 na 125hp (1979) euro
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Alfa Romeo Spider "Duetto" 1.6 104hp (1986) euro |
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Fasteddie313
Joined: 29 Sep 2013 Posts: 2596 Location: MI
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Posted: Fri Jul 24, 2015 1:05 am Post subject: |
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chris79 wrote: | Ah it's more difficult to increase turbo pressure on 924 turbo that on 924 na + efi ? |
No.. But you can only increase the pressure just a little without a ton of fab work to install an IC, or possibly go with water/meth injection. Then you can increase a little bit more, then in theory you run into the wall of how much fuel the CIS can put out, they you have to go EFI anyway if you want more and a bigger turbo..
It looks to me that if you go efi + turbo + IC on an NA you're already more powerful than a 931 turbo + IC maxed without efi..
With a good efi, turbo, charge cooling, and a GOOD TUNER the NA engine may actually be better to boost than the turbo motor due to the weak turbo pistons, it seems the NA pistons can handle more abuse.. But the turbo head is better flowing..
If you start with an NA you are going straight to a custom exhaust manifold, modern turbo of your choice, ditching all CIS, much more room for plumbing and a custom intake if you wish, your starting out with a better package than a tuned 931 still on CIS minus the head which isn't really THAT much better..
Then again some NA drivelines (trans/clutch) can't handle all the power like a 931 driveline can, yours being a late model you may not have this limitation, I don't know..
Properly turbo'd NA you're going to get 300 hp if tuned well, a tweaked up 931 with an IC still isn't getting 300 hp, your going to have to upgrade the pistons, turbo, go efi, charge cooling, etc. anyway to get to the level of a well done turbo NA engine with a 931..
Turboing an NA you're going to start big, go big or go home, which is much better than an OEM 931, you'd have to redo pretty much everything on a 931 anyway to go as big as you'd start off turboing an NA..
A 350 hp NA may be less work than a 350 hp 931, or very equal..
I don't know, maybe some more experienced members can comment on this to vett what I wrote because I'm really just going off what I read.. _________________ 80 Turbo - Slightly Modified |
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fiat22turbo
Joined: 18 Jan 2006 Posts: 4040 Location: Portland, OR
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Posted: Fri Jul 24, 2015 1:06 am Post subject: |
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chris79 wrote: | Ah it's more difficult to increase turbo pressure on 924 turbo that on 924 na + efi ? |
what? _________________ Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose) |
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chris79
Joined: 29 Jan 2014 Posts: 551 Location: milan
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Posted: Fri Jul 24, 2015 3:56 am Post subject: |
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I was trying to convince me not to do the conversion to turbo, now I'm even more convinced to convert my na _________________ Porsche 924 2.0 na 125hp (1979) euro
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Alfa Romeo Spider "Duetto" 1.6 104hp (1986) euro |
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morghen
Joined: 21 Jan 2005 Posts: 8868 Location: Romania
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Posted: Fri Jul 24, 2015 8:21 am Post subject: |
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One of these days i will pick up a NA engine, dyno it, cut the block to get to 12.5:1 CR, adjust fuel and timing and maybe flywheel weight snd dyno it again just gor fun. _________________ https://www.the924.com |
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fiat22turbo
Joined: 18 Jan 2006 Posts: 4040 Location: Portland, OR
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Posted: Fri Jul 24, 2015 8:37 am Post subject: |
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chris79 wrote: | I was trying to convince me not to do the conversion to turbo, now I'm even more convinced to convert my na |
Don't. Buy a proper 924 Turbo. You'll be miles ahead and actually closer to diving it than trying to convert. _________________ Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose) |
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Raceboy
Joined: 01 Mar 2004 Posts: 2326 Location: Estonia, Europe
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Posted: Fri Jul 24, 2015 2:47 pm Post subject: |
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In Europe 931's cost few times more than its counterparts in US...
But agree, OP clearly is not able to succeed with making a custom turbo system+EFI... _________________ '83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold
'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche |
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chris79
Joined: 29 Jan 2014 Posts: 551 Location: milan
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Posted: Fri Jul 24, 2015 7:28 pm Post subject: |
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Morghen I read more times your advice and I'm interested to this modification, but you are the only user that recommend cut of block.
Are you sure this is possible on european na? And then if I use normal fuel not 98 octanes (in Italy about 1,8 euro/liter) ? I can buy another block for try this tuning. _________________ Porsche 924 2.0 na 125hp (1979) euro
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Alfa Romeo Spider "Duetto" 1.6 104hp (1986) euro |
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Raceboy
Joined: 01 Mar 2004 Posts: 2326 Location: Estonia, Europe
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Posted: Fri Jul 24, 2015 8:22 pm Post subject: |
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Yes, machining the block is possible but you cannot use any other fuel other than 98! It will detonate like crazy on hot days. _________________ '83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold
'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche |
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chris79
Joined: 29 Jan 2014 Posts: 551 Location: milan
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Posted: Fri Jul 24, 2015 8:39 pm Post subject: |
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Then this project don't start, even normal fuel is too much expensive. _________________ Porsche 924 2.0 na 125hp (1979) euro
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Alfa Romeo Spider "Duetto" 1.6 104hp (1986) euro |
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Raceboy
Joined: 01 Mar 2004 Posts: 2326 Location: Estonia, Europe
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Posted: Fri Jul 24, 2015 10:45 pm Post subject: |
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Lol if you need to worry about fuel price when considering your hobby car, it is surely too expensive for you. _________________ '83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold
'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche |
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chris79
Joined: 29 Jan 2014 Posts: 551 Location: milan
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Posted: Fri Jul 24, 2015 11:43 pm Post subject: |
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Not only for costs, but this is limit for car, I have to find always distributor with 98 octane fuel. _________________ Porsche 924 2.0 na 125hp (1979) euro
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Alfa Romeo Spider "Duetto" 1.6 104hp (1986) euro |
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snakoil
Joined: 09 Feb 2010 Posts: 362 Location: Montreal, Canada
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Posted: Sat Jul 25, 2015 1:17 am Post subject: |
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usually you find someone that has 93 or 94 and then you add bottles of octane booster in your tank _________________ 1979 924 NA |
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