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Elektrobank
Joined: 19 Mar 2007
Posts: 149
Location: Pozzuoli,Napoli, Italy
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 Posted: Tue Mar 15, 2011 7:42 am Post subject: 931 efi conversion, the italian way |
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hallo Guys it's more than one year that i'm away from the board
but for a really good reason 
http://www.youtube.com/watch?v=kab9ltwyHy0
a small video of my 1980 931 efi conversion
the fuel rail and fuel pressure regulator comes from the sierra cosworth 4x4
the TPS is a weber marelli part from lancia delta integrale and is bolt on for the S2 manifold
injector are bosch from the audi 5 cyl turbo
the ecu is a dta S40
lambda sensr is the bosch lsu 4.2 type
intake manifold thanks to Rich 
the pop off and spark plugs comes from my officine
the coilpacks are dirt cheap (less than 30 euros) and comes from the fiat punto 55 made by marelli
crank sensor from ford, zetec engines and custom made bracket
after some hous of road mapping the car runs really sweet!
no hesitation in any condition and the AFR is around 14
that's all for the first 50 kilometer 
i have also rebuilt the turbo with a new core and new(used) turbohotside housing (number 4 in place of the old nr 6) the turbo spools up quickly around 2.200 rpm and the original internal popoff bypassed simply fitting the piston in the reverse mode,facing the spring, no more clicking now!
new valve steam seals purchased new from porsche (more or less 40 euros) they are SKF and very well made! much better than victor reinz one!
next step will be the 944 cooler and LPG sequential injection...
fuel is not cheap here! 
_________________
924T Dta inj + sequential LPG
Cosworth
MotoMorini 501
Moto Morini 350 K2
lot of fun but always on foot.... |
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Nein37
Joined: 29 Dec 2009
Posts: 513
Location: New London, CT
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| Posted: Tue Mar 15, 2011 9:38 am Post subject: |
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So much room in the engine bay. Just awesome!
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1981 931 CGT replica, OEM CGT intercooler, .8 BAR WG spring, GTS Headlights, Innovative Wide band A/F, A/C delete, 16" Fuchs, Weltmeister 200lb lowering springs, Bilstein HDs front, Koni Sport rears. |
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morghen
Joined: 21 Jan 2005
Posts: 9095
Location: Romania
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| Posted: Tue Mar 15, 2011 5:10 pm Post subject: |
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very nice !! great looking !!
but 14 is too lean my friend ! especially if you dont have an intercooler.
the engine sounds SUPERB...please take very good care of it !
what boost are you running?
AFR should be 12 or even 11 if you run big boost at 3300-3500 RPM and then lean out to 13.5 as you go for max power.
ofcourse the fine AFR tuning is related to the specific engine...but mainly i would go for those values.
here is a graph of my AFR for 0.9 bar...with an intercooler.
Uploaded with ImageShack.us
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Supercharger and EFI kits
https://www.the924.com |
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gegge
Joined: 27 Jul 2007
Posts: 1124
Location: Sweden
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| Posted: Tue Mar 15, 2011 8:17 pm Post subject: |
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Sounds sweet 
In the meanwhile, put the intake filter in a coldair zone! As it is your engine is sucking in 40° of post radiator heated air. You´re loosing power as well as risking the pistons in case of detonation.
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Carl Fredrik Torkildsen
924 turbo -81 Carrera GT RESTOMOD
924 turbo -80 Dolomite De Luxe
924 -85 DP kit, BBS RS, M030 and tuned engine
924s -86 Black on black turbo with Fuchs |
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stevekat
Joined: 19 Jan 2008
Posts: 719
Location: Los Angeles, CA
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| Posted: Tue Mar 15, 2011 10:16 pm Post subject: |
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Clean. Love it.
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"Never get out of the boat. Absolutely goddamn right. Unless you are goin' all the way."
Gone to new home: '81 924T, US version, CGT Intercooler, UTCIS-PT, Euro DITC, Greddy Trust MBC, Forged Fuchs Flat Dish 6's, Factory Recaro's. |
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ideola
Joined: 01 Oct 2004
Posts: 15550
Location: Spring Lake MI
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| Posted: Wed Mar 16, 2011 12:11 am Post subject: |
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Impressive! How are you liking the DTAFast ECU?
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erstwhile owner of just about every 924 variant ever made |
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Rasta Monsta
Joined: 12 Jul 2006
Posts: 11733
Location: PacNW
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| Posted: Wed Mar 16, 2011 1:17 am Post subject: |
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Looks good, sounds great. . .you'll want to watch that plastic line where it is resting on the alternator though. . .it could abrade through.
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Toofah King Bad
- WeiBe (1987 924S 2.5t) - 931 S3
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fiat22turbo
Joined: 18 Jan 2006
Posts: 4040
Location: Portland, OR
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| Posted: Wed Mar 16, 2011 3:22 am Post subject: |
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Nice!
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Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose) |
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Joes924Racer
Joined: 03 Nov 2002
Posts: 11964
Location: Oregon, Denver Colorado native!
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| Posted: Wed Mar 16, 2011 3:59 am Post subject: |
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The Italian way huh... way to go.
sweet.
_________________
1979 porsche 924 Na
1980 porsche Turbo 931GT Replica
Have u ever driven a turbo. |
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Elektrobank
Joined: 19 Mar 2007
Posts: 149
Location: Pozzuoli,Napoli, Italy
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| Posted: Wed Mar 16, 2011 8:13 am Post subject: |
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| morghen wrote: | very nice !! great looking !!
but 14 is too lean my friend ! especially if you dont have an intercooler.
the engine sounds SUPERB...please take very good care of it !
what boost are you running?
AFR should be 12 or even 11 if you run big boost at 3300-3500 RPM and then lean out to 13.5 as you go for max power.
ofcourse the fine AFR tuning is related to the specific engine...but mainly i would go for those values.
here is a graph of my AFR for 0.9 bar...with an intercooler.
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thanks for the reply morghen!
the engine runs really sweet! new oil, new turbo, new valve seals, new spark plugs new spark cables "new inlet manifold" and tappets well adjusted... i hate clicking engines! and much more 
boost is standard at the moment, i have installed also a boost controller...permanently switched off
i really like how the car runs in the original format, but sometimes the boost rises to 1.0 max 1.2 bar ( the boost controller has a remote controller) for a really small amount of seconds
tuning is not yet finished!
thank for your graph! will keep it as reference!
_________________
924T Dta inj + sequential LPG
Cosworth
MotoMorini 501
Moto Morini 350 K2
lot of fun but always on foot.... |
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Elektrobank
Joined: 19 Mar 2007
Posts: 149
Location: Pozzuoli,Napoli, Italy
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| Posted: Wed Mar 16, 2011 8:16 am Post subject: |
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| gegge wrote: | Sounds sweet
In the meanwhile, put the intake filter in a coldair zone! As it is your engine is sucking in 40° of post radiator heated air. You´re loosing power as well as risking the pistons in case of detonation. |
will do ASAP! in this configuration during running we have really low IAT
not more than 30/35 celsius degrees also after some hard launch
_________________
924T Dta inj + sequential LPG
Cosworth
MotoMorini 501
Moto Morini 350 K2
lot of fun but always on foot.... |
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Elektrobank
Joined: 19 Mar 2007
Posts: 149
Location: Pozzuoli,Napoli, Italy
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| Posted: Wed Mar 16, 2011 8:28 am Post subject: |
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| ideola wrote: | | Impressive! How are you liking the DTAFast ECU? |
DTA ecu are really nice piece of engineering, ease of use, all kind of configuration is possible, and is really easy to do!!
my friend Silvio is the only offical importer and seller for italy he really knows the ability of those ecu's, the DTA-S40 is the cheapest and the entry level, it is expensive (around 700 eur) but when you start to tune the car will love the way you spent the money, megasquirt is deadly cheap! but the time needed to reach the level of DTA's tune is 10 times bigger...
in small words Dan...
DTA = 700 eur for the ecu, 50 eur fuel, 5 hours tuning
MEGASQUIRT = 100 eur the ecu 500 eur fuel, 50 hours tuning
and obviousely more chanches to break the engine for bad settings / more tuning errors
the serious EFI tuning is DTA...
_________________
924T Dta inj + sequential LPG
Cosworth
MotoMorini 501
Moto Morini 350 K2
lot of fun but always on foot.... |
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morghen
Joined: 21 Jan 2005
Posts: 9095
Location: Romania
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| Posted: Wed Mar 16, 2011 8:22 pm Post subject: |
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1 bar spikes and 14 AFR.....please tune that thing...
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Supercharger and EFI kits
https://www.the924.com |
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Min
Joined: 04 Nov 2002
Posts: 2368
Location: Vernon, British Columbia, Canada
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| Posted: Thu Mar 17, 2011 3:24 pm Post subject: |
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| Elektrobank wrote: |
DTA = 700 eur for the ecu, 50 eur fuel, 5 hours tuning
MEGASQUIRT = 100 eur the ecu 500 eur fuel, 50 hours tuning |
Last time I tuned my car from scratch it took maybe 3 hours? I could see 50 hours if you have no idea whatsoever on what to do. But even then, most of that would be reading documentation and internet forums rather than driving time. Exaggeration for the win!
Min
_________________
Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting. |
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Euro924S2
Joined: 06 Mar 2008
Posts: 215
Location: UK
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| Posted: Sun Mar 20, 2011 8:42 am Post subject: |
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A year very well spent i think!!! Nice!!!
Have to agree with the points above tho, 14 is brave!!! Quench those cylinder walls with some extra fuel my friend!!!
I'm super impressed with the 2,200 RPM spool up - I'm building a custom supercharger install to get low down power but maybe I shouldn't have bothered!!!
I'm interested by the 3 hour tuning time for any standalone ECU on a new project install. I fitted an Adaptronic 420C to my brothers supercharged MX5 (miata) and admittedly that had fully 3D mapped individual cylinder water injection but I spent several days tuning it spread over 2 or 3 weeks - most of it perfecting the low speed / idle tune. If you can get an OEM result in 3 hours then quit whatever your day job is and set up in the UK - you will make a fortune!!!! Some real horror stories from UK tuners - I have personal experience of 4 of them - all spent at least 7 hours on the rollers and non managed a 'decent' tune!!!
I've just ordered a 420C for mine since I'm now familiar with it so hope it will be quicker for mine, but I was planning on tuning over days to weeks, not minutes to hours!!!!
NICE JOB!!!
Cheers, John.
_________________
UK spec '83 N/A with 931 motor with Eaton MP62 'charger @ 15psi. EFI - 565cc inj. Standalone Adaptronic ECU. 951 FMIC. Ally rad. Twin throttle. Recirc valve. Custom manifolds and CAI. 232bhp |
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924 FAQ (Technical)
