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XLR8
Joined: 30 Mar 2016 Posts: 143 Location: Byron Bay, Australia
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Posted: Sun Apr 14, 2019 5:40 pm Post subject: Turbo Project - Rebuild & convert NA or a 924 Turbo engi |
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I have a burnt exhaust valve, and a rear main seal leak on my NA.
So pulling the engine and attending to both at once (and some other stuff) seems the best way to go.
If she's out, probably best to
1) give her a freshen up and get her ready for a turbo conversion OR ....
2) Shall I just find an original Turbo engine and freshen that up?
What's best - a Turbo conversion on a refreshed NA engine, or a refreshed S1 or S2 Turbo engine?
Why?
Ultimate power goal would max out at 220-230hp as I don't want/need to change TT or gearbox. _________________ '81 Porsche 924 NA
'89 Eunos Roadster NA6
'06 Landcruiser HDJ100 |
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peterld
Joined: 10 Dec 2006 Posts: 947 Location: Noosa Heads QLD Australia
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Posted: Sun Apr 14, 2019 6:40 pm Post subject: |
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Vexed question!
If you are going to modify the Toofah, then ideally go with the latest that's out there, rather than 30-40 yo technology.
Your current bottom end is already virtually a turbo: same block, same forged crank, same forged conrods. Some forged lower comp pistons would be sweet.
The cherry on top would be a nice turbo head - slightly better flow and it would be nice to get the spark plugs away from the exhaust! Then a modern turbo and intercooler to finish up. Lots of manufacturing of pipes and brackets though. The clincher is that it's difficult to find a good turbo head. Many have gone through extreme heat cycles in previous hands which in turn leads to softening of the metal on the exhaust side.
If it was me I'd take a different tack altogether........supercharging!
RC.....well known on this Board, and a former resident of your town, should be your go-to for further info on this. His application is exemplary! _________________ 80/81 932/8 ROW |
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morghen
Joined: 21 Jan 2005 Posts: 8883 Location: Romania
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Posted: Sun Apr 14, 2019 10:18 pm Post subject: |
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For 924 turbo engine you must change the TT and gearbox.
For 220hp also you should change the TT and gearbox as the gears are too short and maybe wont last too much if you abuse it.
Cheapest and best way is to convert the NA to turbo and EFI. _________________ https://www.the924.com |
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XLR8
Joined: 30 Mar 2016 Posts: 143 Location: Byron Bay, Australia
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Posted: Fri May 31, 2019 7:53 am Post subject: |
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Actually (given modification restrictions here) seeking more than about 220hp would be tough to get road registered.
As a result, I am leaning towards a refresh, and using the current 9.5:1(?) pistons and a small turbo to get to about that level.
Mustang clutch? _________________ '81 Porsche 924 NA
'89 Eunos Roadster NA6
'06 Landcruiser HDJ100 |
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Noahs944
Joined: 08 Dec 2015 Posts: 782 Location: Calgary, Alberta, Canada
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Posted: Fri May 31, 2019 9:05 am Post subject: |
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Consider nitrous? |
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XLR8
Joined: 30 Mar 2016 Posts: 143 Location: Byron Bay, Australia
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Posted: Fri May 31, 2019 10:02 am Post subject: |
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Nitrous is not legal for a road car here in Oz.
Also the car is to be focussed on the twisties. NA power would be preferable, but seems a bit too hard in comparison. _________________ '81 Porsche 924 NA
'89 Eunos Roadster NA6
'06 Landcruiser HDJ100 |
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snakoil
Joined: 09 Feb 2010 Posts: 362 Location: Montreal, Canada
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Posted: Fri May 31, 2019 11:02 pm Post subject: |
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I just rebuilt my 2.0L NA and price creeps up quickly on things you would have never thought if you want a clean job.
You always end up saying: "while i'm there i might as well do..."
Regrind crankshaft, new main bearings, pistons rings, new clutch while at it, new engine mounts, replace old ruster wiring, rebuild alternator and starter while in there, CIS maintenance since it's currently out.
In the end I wish I would have taken the money and worked on a VW 1.8T conversion. Engines are plenty, repairs can be done in any shop, upgrades are easy. You have lots of option for a stand alone ECU and ready to use maps. _________________ 1979 924 NA |
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XLR8
Joined: 30 Mar 2016 Posts: 143 Location: Byron Bay, Australia
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Posted: Sat Jun 01, 2019 7:52 am Post subject: |
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snakoil wrote: | I just rebuilt my 2.0L NA and price creeps up quickly on things you would have never thought if you want a clean job.
You always end up saying: "while i'm there i might as well do..."
Regrind crankshaft, new main bearings, pistons rings, new clutch while at it, new engine mounts, replace old ruster wiring, rebuild alternator and starter while in there, CIS maintenance since it's currently out.
In the end I wish I would have taken the money and worked on a VW 1.8T conversion. Engines are plenty, repairs can be done in any shop, upgrades are easy. You have lots of option for a stand alone ECU and ready to use maps. |
Hmm, I know this is what is going to happen .... _________________ '81 Porsche 924 NA
'89 Eunos Roadster NA6
'06 Landcruiser HDJ100 |
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Juho
Joined: 03 Oct 2018 Posts: 379 Location: Finland
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Posted: Sat Jun 01, 2019 8:04 am Post subject: |
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i am doing a efi and turbo conversion atm. What exhaust manifold are you planning to use? |
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Raceboy
Joined: 01 Mar 2004 Posts: 2326 Location: Estonia, Europe
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Posted: Sat Jul 06, 2019 5:21 am Post subject: |
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Why would he need to swap gearbox and tt for 220 hp??
Pieter (DutchPug) had around 400 hp with stock 924 tt and gearbox..
And also, 1.8T engine swap is nonsense as it a) will not be cheap, b) in stock configuration it is a weak engine, c)it will be gutless below 4000 rpm with aby turbo that flows 400+ hp worth of air.
Plus it won't have the same 924 factor anymore.
I do not speak from guess, I have turbocharged several 924's over the years and also have modified 1.8T engines wuite a bit. _________________ '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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vdub6v
Joined: 07 Jul 2016 Posts: 41 Location: West Chester, PA 19382
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Posted: Mon Dec 02, 2019 12:44 pm Post subject: BEA Turbo kit |
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I was presented with a BEA turbo kit. My 1980 NA 2.0L is pretty solid and I should leave good enough alone. It's really not practical to look at a turbo option on this motor unless you plan to change the internals for lower compression correct?
40 year old motor will probably remain NA. |
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Fasteddie313
Joined: 29 Sep 2013 Posts: 2596 Location: MI
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Posted: Mon Dec 02, 2019 1:57 pm Post subject: Re: BEA Turbo kit |
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vdub6v wrote: | I was presented with a BEA turbo kit. My 1980 NA 2.0L is pretty solid and I should leave good enough alone. It's really not practical to look at a turbo option on this motor unless you plan to change the internals for lower compression correct?
40 year old motor will probably remain NA. |
No, it can take some serious boost mostly stock but needs an intercooler to go along with any turbo.. _________________ 80 Turbo - Slightly Modified |
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safe
Joined: 18 Mar 2017 Posts: 588 Location: Sweden
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Posted: Mon Dec 02, 2019 9:13 pm Post subject: Re: BEA Turbo kit |
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vdub6v wrote: | I was presented with a BEA turbo kit. My 1980 NA 2.0L is pretty solid and I should leave good enough alone. It's really not practical to look at a turbo option on this motor unless you plan to change the internals for lower compression correct?
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Depends on your fuel availability and engine management, if you perhaps have E85 in your area, golden!
Not a must to change compression, not sure what you got in your engine, might be lower than euro 9.3 so even better then. |
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safe
Joined: 18 Mar 2017 Posts: 588 Location: Sweden
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Posted: Mon Dec 02, 2019 9:21 pm Post subject: Re: Turbo Project - Rebuild & convert NA or a 924 Turbo |
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XLR8 wrote: | I have a burnt exhaust valve, and a rear main seal leak on my NA.
So pulling the engine and attending to both at once (and some other stuff) seems the best way to go.
If she's out, probably best to
1) give her a freshen up and get her ready for a turbo conversion OR ....
2) Shall I just find an original Turbo engine and freshen that up?
What's best - a Turbo conversion on a refreshed NA engine, or a refreshed S1 or S2 Turbo engine?
Why?
Ultimate power goal would max out at 220-230hp as I don't want/need to change TT or gearbox. |
The turbo head is slightly better, I'm not sure its so much better that i warrants the cost on a turbo conversion.
Both engines would probably need new pistons, bottom end is super strong otherwise.
Start with another NA engine (they are so cheap) on the side then swap it out when you are ready. |
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XLR8
Joined: 30 Mar 2016 Posts: 143 Location: Byron Bay, Australia
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Posted: Sun Jan 26, 2020 7:15 am Post subject: |
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Finally sorted. The oil leak was so minor that I had a (not "the") head reconditioned and swapped it over. Car runs like a champ now.
The flipside is I have a bottom end and a couple of spare heads sitting ready for me to build into something special. _________________ '81 Porsche 924 NA
'89 Eunos Roadster NA6
'06 Landcruiser HDJ100 |
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