924Board.org

Insane · Joined: 20 Jun 2009 Posts: 65 Location: Kyiv

HI everyone,
I'm new here. Six month ago I've bought a Porsche 924 and I've started thinking over some tuning for it. So the first step was the EFI conversion.
Now it's finished.
I've seen some posts here about that and I'd like to share my experience here for a case someone would like to do something similar.

Actually, I haven't seen it mounted on the car yet, but it runs well on a dyno.

For the conversion you'll need:
- ECU and wiring harnesses
- Oxygen sensor //placed on the downpipe
- Air mass meter
- Water temp sensor //placed in the cylinder head instead of thermo-timer
- crankshaft positioning sensor and a crankshaft gear
- throttle positioning sensor // placed on the throttle body
- knock sensor //best place I've found is near the intake manifold
- fuel rail + fuel pressure regulator (I've heard that Ford Sierra '99 is suitable)
- injectors
- idle valve // placed on the place of cold start valve in the intake manifold
<UPD>
- new starter, fan, fuel pump relays
- destributorless ignition module, hall effect sensor (or a new Tacho gauge)
</UPD>
You will also need to machine some stuff:
- injector's fitting adapters
- fuel rail & bracket
- water temp sensor adapter
- crankshaft pos. sensor bracket
- crankshaft gear should be centered on the crank
- throttle positioning sensor bracket adapter
- some piping for AFM may be required

For proper set-up you'll need:
- wide-band Oxygen sensor and logger
- ECU flasher and the software (online programmable ECU is the best)
- a Dyno for the best tuning
- may be something else...

What do you get?
- no hot start problem as well as no cold start problem
- a bit more horsepower
- quicker throttle response
- fully adjustable system almost ready to accept turbo

My case is a custom EFI conversion kit built on J5.1 ECU which is used in most new russian cars and is an analogue of BOSCH ECU

so you may ask qeustions if you're doing the same - I'll try to help you

UPD:

I've just took it back from the workshop and made about 400km back home.
1) J5 EFI & Ignition installed
2) GETRAG Dogleg gearbox installed (Damn, it's fun!)
3) All wiring changed an rebuilt. it's almost as stock now!
--
Best regards,
Vladimir Linkevich

CorsePerVita · Joined: 25 Jul 2008 Posts: 1992 Location: Redmond, Oregon

Great information, may wanna fix your image links though. They need a link to the image file itself. such as www.whatever.com/something/something.jpg

Great info though thank you for sharing, i'm looking into EFI conversion actually for my 77' so i'm digging like mad for info.
_________________
- 1977 Porsche 924 2.0 N/A (Trackday Project)
- 1979 Porsche 924 2.0 N/A (The other daily)
- 1980 Porsche 931 (Daily)
- 1987 Lamborghini Jalpa
- 1999 Ducati 900SS

Insane · Joined: 20 Jun 2009 Posts: 65 Location: Kyiv

Insane · Joined: 20 Jun 2009 Posts: 65 Location: Kyiv

I've got more plans
- Brakes stage 1 upgrade (bought it already) // use 944<85 brakes, hubs and knuckles
- Installing a turbo on 2.0 NA
- Brakes upgrade stage 2 // Porsche 996 calipers and rotors (this requires some more changes)
- 17/18 inch wheels
- Porsche 944 fenders (or widebody)
- rebuild NA to Turbo // 300 flywheel hp est.
something else, I think

Scorpio · Posted: Sat Jun 20, 2009 5:21 pm Post subject:

Very nice work...

Throwing on a turbo will make it easy to get 300hp....only problem is the rest of a NA cant take 300hp....

You will also need to sort out...clutch.....stronger gearbox...torquetube...perhaps pistons and engine internals
_________________
1979 NA
MS1..EFI..
GARRETT T25 TURBO
BILSTEIN SHOCKS
GT BASED CUSTOM BODYKIT

Brisbane , Australia
Think mean think fast
all youll see is
my Porsches Arse!!!

Insane · Joined: 20 Jun 2009 Posts: 65 Location: Kyiv

Scorpio · Posted: Sat Jun 20, 2009 5:36 pm Post subject:

pocketscience · Posted: Sat Jun 20, 2009 5:41 pm Post subject:

Nice work. I'm seeing some potential hood clearance issues here...

G.
_________________
Whoever said you can't buy happiness forgot about Porsche!
81 924 N/A, GTS lights, Saratoga, interior, headers, Integral cam, EFI (sold)
95 993
69 911

Rich H · Posted: Sat Jun 20, 2009 5:51 pm Post subject:

Drop the hood a couple of times, clearances sort themselves out!

I have an EFI'd N/A there aren't many like us!

What did it make on the dyno?

I have very similar plans - already got the brakes and the turbo plan is still lurking in the back of my mind...

200bhp is more than possible apparently - the racing cars produced plenty more than that and there are high power turbo's on standard internals.
_________________
1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec

Insane · Joined: 20 Jun 2009 Posts: 65 Location: Kyiv

Insane · Joined: 20 Jun 2009 Posts: 65 Location: Kyiv

Shurick · Joined: 15 May 2005 Posts: 524 Location: Russia, Moscow.

Great setup! But why do you use MAF? J5.1 can run with MAP and it's gives much more reliable system.
_________________
WBR, Shurick
'79 931 -- intercooled K26-3060-6.10 turbo @ 1.2 bar, EFI+EDIS, 951S brakes, stripped interior, 951 look.
'86 924S -- R.I.P.
https://www.instagram.com/ru_pacecar/

Insane · Joined: 20 Jun 2009 Posts: 65 Location: Kyiv

Insane · Joined: 20 Jun 2009 Posts: 65 Location: Kyiv

Hey, guys!
Can anyone help me?
TACHO question.

I'm using two coil distributorless ignition, so I cannot connect the stock tacho to it.
I have a digital output on the ECU, but the tacho will not work with it as well.
So at the moment the distributor is still in place just for tacho signal.

Any Ideas on connecting the tacho gauge?

Shurick · Joined: 15 May 2005 Posts: 524 Location: Russia, Moscow.

You need a converter to force it to work. Unfortunately, I can ask my friend to make it clear only at friday: I'm out of Moscow now.
_________________
WBR, Shurick
'79 931 -- intercooled K26-3060-6.10 turbo @ 1.2 bar, EFI+EDIS, 951S brakes, stripped interior, 951 look.
'86 924S -- R.I.P.
https://www.instagram.com/ru_pacecar/