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performance improvements
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nickthompson  



Joined: 26 Mar 2013
Posts: 873
Location: Central Georgia

PostPosted: Thu Jul 23, 2015 8:30 am    Post subject: Reply with quote

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

PostPosted: Thu Jul 23, 2015 1:58 pm    Post subject: Reply with quote

Nitrous
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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

PostPosted: Fri Jul 24, 2015 12:04 am    Post subject: Reply with quote

Ah it's more difficult to increase turbo pressure on 924 turbo that on 924 na + efi ?
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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

PostPosted: Fri Jul 24, 2015 1:05 am    Post subject: Reply with quote

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..
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fiat22turbo  



Joined: 18 Jan 2006
Posts: 4040
Location: Portland, OR

PostPosted: Fri Jul 24, 2015 1:06 am    Post subject: Reply with quote

chris79 wrote:
Ah it's more difficult to increase turbo pressure on 924 turbo that on 924 na + efi ?


what?
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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

PostPosted: Fri Jul 24, 2015 3:56 am    Post subject: Reply with quote

I was trying to convince me not to do the conversion to turbo, now I'm even more convinced to convert my na
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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

PostPosted: Fri Jul 24, 2015 8:21 am    Post subject: Reply with quote

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.
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fiat22turbo  



Joined: 18 Jan 2006
Posts: 4040
Location: Portland, OR

PostPosted: Fri Jul 24, 2015 8:37 am    Post subject: Reply with quote

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.
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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

PostPosted: Fri Jul 24, 2015 2:47 pm    Post subject: Reply with quote

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...
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'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.
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chris79  



Joined: 29 Jan 2014
Posts: 551
Location: milan

PostPosted: Fri Jul 24, 2015 7:28 pm    Post subject: Reply with quote

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.
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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

PostPosted: Fri Jul 24, 2015 8:22 pm    Post subject: Reply with quote

Yes, machining the block is possible but you cannot use any other fuel other than 98! It will detonate like crazy on hot days.
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'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

PostPosted: Fri Jul 24, 2015 8:39 pm    Post subject: Reply with quote

Then this project don't start, even normal fuel is too much expensive.
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Porsche 924 2.0 na 125hp (1979) euro
------------------------------------------------------
Alfa Romeo Spider "Duetto" 1.6 104hp (1986) euro
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Raceboy  



Joined: 01 Mar 2004
Posts: 2326
Location: Estonia, Europe

PostPosted: Fri Jul 24, 2015 10:45 pm    Post subject: Reply with quote

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

PostPosted: Fri Jul 24, 2015 11:43 pm    Post subject: Reply with quote

Not only for costs, but this is limit for car, I have to find always distributor with 98 octane fuel.
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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

PostPosted: Sat Jul 25, 2015 1:17 am    Post subject: Reply with quote

usually you find someone that has 93 or 94 and then you add bottles of octane booster in your tank
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