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Turbo Project - Rebuild & convert NA or a 924 Turbo engi

 
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XLR8  



Joined: 30 Mar 2016
Posts: 121
Location: Byron Bay, Australia

PostPosted: Sun Apr 14, 2019 6:40 pm    Post subject: Turbo Project - Rebuild & convert NA or a 924 Turbo engi Reply with quote

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.
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'89 Eunos Roadster NA6
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peterld  



Joined: 10 Dec 2006
Posts: 744
Location: Noosa Heads QLD Australia

PostPosted: Sun Apr 14, 2019 7:40 pm    Post subject: Reply with quote

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!
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morghen  



Joined: 21 Jan 2005
Posts: 8089
Location: Romania

PostPosted: Sun Apr 14, 2019 11:18 pm    Post subject: Reply with quote

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.
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XLR8  



Joined: 30 Mar 2016
Posts: 121
Location: Byron Bay, Australia

PostPosted: Fri May 31, 2019 8:53 am    Post subject: Reply with quote

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?
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'89 Eunos Roadster NA6
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Noahs944  



Joined: 08 Dec 2015
Posts: 782
Location: Calgary, Alberta, Canada

PostPosted: Fri May 31, 2019 10:05 am    Post subject: Reply with quote

Consider nitrous?
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XLR8  



Joined: 30 Mar 2016
Posts: 121
Location: Byron Bay, Australia

PostPosted: Fri May 31, 2019 11:02 am    Post subject: Reply with quote

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.
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snakoil  



Joined: 09 Feb 2010
Posts: 356
Location: Montreal, Canada

PostPosted: Sat Jun 01, 2019 12:02 am    Post subject: Reply with quote

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.
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XLR8  



Joined: 30 Mar 2016
Posts: 121
Location: Byron Bay, Australia

PostPosted: Sat Jun 01, 2019 8:52 am    Post subject: Reply with quote

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 ....
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Juho  



Joined: 03 Oct 2018
Posts: 66
Location: Finland

PostPosted: Sat Jun 01, 2019 9:04 am    Post subject: Reply with quote

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: 2315
Location: Estonia, Europe

PostPosted: Sat Jul 06, 2019 6:21 am    Post subject: Reply with quote

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.
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'67 911 2.4S hotrod
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'82 924S/931 "Gulf", sold
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vdub6v  



Joined: 07 Jul 2016
Posts: 16
Location: West Chester, PA 19382

PostPosted: Mon Dec 02, 2019 1:44 pm    Post subject: BEA Turbo kit Reply with quote

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: 1808
Location: MI

PostPosted: Mon Dec 02, 2019 2:57 pm    Post subject: Re: BEA Turbo kit Reply with quote

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..
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safe  



Joined: 18 Mar 2017
Posts: 99
Location: Sweden

PostPosted: Mon Dec 02, 2019 10:13 pm    Post subject: Re: BEA Turbo kit Reply with quote

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?


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: 99
Location: Sweden

PostPosted: Mon Dec 02, 2019 10:21 pm    Post subject: Re: Turbo Project - Rebuild & convert NA or a 924 Turbo Reply with quote

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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