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Ben's 1982 928 S "restoration"

 
Old 03-17-2019, 06:05 PM
  #16  
Ben006
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Yours is really nice ! I like the wheels and shaved off side trims !
Yeah, my S4 wing is definitely comming off ! It's fiberglass and it does look out of place with the side pices still in place...
I want to make one that will ressemble the stock one, but maybe going a little higher, like a ducktail, I don't know yet...first I need to get it running

So many stuff to do on that car first !

I don't know if I wait to sell the K-jet to start the EFI conversion, or do it right now and sell the K-jet for a better price later.
I've put it up for 2500€... that might be a little high ...
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Old 03-17-2019, 10:51 PM
  #17  
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Thanks Ben... Wish I could take credit for the mods & the rose gold paint... but I can't. Me and the guys in the club did put the whole thing back together again, which was pretty interesting since we didn't take it apart Let me know when you take off the glass wing and how much you need in return. I think it'll look better than my current glass wing as it matches the Aero mirrors. Just PM me and we can discuss without side-tracking your current thread.

Joel
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Old 03-18-2019, 06:22 PM
  #18  
karl ruiter
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I would not get rid of the CIS until you have your EFI in and working. For most people and EFI conversion is a can of worms that never gets finished. A huge percentage of such projects that are documented here start out bravely and then stall. So keep the CIS as fall back.
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Old 03-19-2019, 06:06 PM
  #19  
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You are right. I've also looked into selling my Boxster S to finance the 928 project (because even though I love my 986, the 928 is my real dream car).
I can easily find another 986 (maybe not with the same interior though ), but it's hard to find a 928 S in good shape here !

I started ordering the parts for the conversion. IAT sensor, CLT sensor (with pigtails) and throttle body.
I sandblast one of the intake runner yesterday to see better. I'll have to bore the injectore hole to the correct size to accept the new injectors that are way shorter than the original ones. I'll post a photos soon.

I still haven't decided what to do with the sunroof... either close is definitely (and do it properly), or try to make something with it ? Any idea ?

Ben.
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Old 03-19-2019, 08:53 PM
  #20  
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Hi Ben. Keep up the good work. I have 2 cis cars, and 1 L-jet (1982). The cis system is a challenge, but makes good power when tuned right (mine are not...yet).

Your cis parts would need to be rebuilt, so for most, the value would be low, but you never know what someone is willing to pay if they have the need and the means.

Please post pictures and details on your efi conversion, as I am quite interested.

Good luck.
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Old 03-22-2019, 07:24 PM
  #21  
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Default Waking up the K-JET

What's your engine # ?? If you have a 28/11 engine,it's a potential monster, Like 300+HP!! K-Jet doesn't like to sit, because it works on hydraulic pressures supplied by the fuel..Fuel flow rate, system pressure, hot & cold control pressure, A/F setting and idle speed air bleed screw all interact...I have an '83S2 Euro car with K-Jet and I've been thru the whole system because mine sat for about 5 years(that I know of)....YOU NEED a set of CIS gages to tune it, plus a LONG 3mm ball-end hex wrench,,,and it is finicky...Start with fuel flow: IRRC it's 1300 cc in 30 sec...I check it at the fuel return line above the tank....Next: System pressure: hook up the CIS gages...Aprx.5 Bar or 75 Psi is what to expect..Cold control pressure I check with the engine stone cold. For Hot pressure,I run the car till the temp. gage is off the peg...Hot & Cold pressure varies depending on the WUR # you have. Then you set the A/F ratio,,,this is where the long 3mm hex wrench comes in handy..It lets you adjust the A/F r screw without taking off the air-cleaner. Next adjust idle speed with the air bleed screw.....THEN go back and re set the A/F ratio screw, because by changing the air bleed screw, you've altered the A/F ratio...THEN back to reset the idle speed..AND.You go "Roundy-Round" like this till you have it "Perfect" or get bored with it ( close enough is good enough).I drove mine from Phila. to Pittsburgh for the PVGP in '17--350 miles out & 350 miles back+ 3 days running around and I STILL got 19+ MPG...And It's not 'perfect'
..M-B injectors are CHEAP! I got 8 M-B ******47 injectors for what ONE L-Jet injector would cost..SALVOX has a rebuild kit for my WUR,. It includes a new spring diaphragm and all the gaskets for the WUR..928 Classics has a page of info on how to do a basic setup on an '78 928 ,but it applies to later K-Jet 928s.
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Old 03-26-2019, 06:11 PM
  #22  
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I believe mine is a 28/11 yes.





The car won't be used daily, I have too many already to drive any of them daily :/


So it's probably going to sit for a few days at a time, that's also why I'm going EFI !





I'm done sandblasting the intake runners and plenum !








I need to receive the throttle body before I can go on with the intake.
Once it's sorted, I'll crank the project up and do a bit more and faster !





When I'm not at work (Porsche Tech), or at home working on the 928 or the XJR, I'm making other stuff ...


I just finished my first batch of carbon fiber intake plenums for the 986 Boxster ( I don't do the main carbon fiber part myself because I SUCK at that...)
I'm very proud of it though, check this :











Once the first batch is sold, I'll have a bit of money to throw at the 928 too








Ben
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Old 03-27-2019, 12:15 AM
  #23  
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Originally Posted by Ben006 View Post
I've decided to get rid of the K-jetronic and go EFI. I'm way more familiar with those kind of systems, and I've always wanted to do an efi conversion... so, this is the right occasion !
Can you describe your plan in detail? Like: Who's EFI system and where you're sourcing it. I prefer early cars and I'd like to go to a modern engine management system.
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Old 03-27-2019, 03:43 PM
  #24  
Ben006
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For now, until I change my mind as always, the plan is :
-Speeduino ECU from a guy in UK. He's done a few and has given me great advices so far.
-24lbs injectors (listed as mustang injectors), they are cheap and easy to find. I should be able to make them fit to the stock intake runners.
-custom fuel rails from extruded aluminum that had the correct shape already (found it on eBay too)
-80mm universal throttle body with TPS (it will require modifications to the plenum, but I don't know the extent of the modifications yet !)
-custom trigger wheel and crankshaft position sensor mount
-VW/Skoda 4 posts coils (Lupo GTi)
-Haven't decided on the fuel pressure regulator yet.

That's the big stuff, I'll need all kinds of other custom brackets, hoses and fittings, plus fitting the temp sensors etc...
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Old 03-28-2019, 10:50 AM
  #25  
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The Speeduino is a rather interesting choice. There are TONS of accessory boards for the Arduino base platform. This might be a good starting point to replace the known issues with the fan controller. One could certainly use/build a simple GPIO breakout board with sufficiently solid signaling to bridge the fan controller directly into the ECU alongside some nice engine-mounted temp sensors.

On your mustang injectors, you probably already know this, but if you're going with rebuilt versions, make sure you get good ones for a reputable rebuilder. I purchased some for a previous 80' OB that ended up faulting out after a small amount of time.

Originally Posted by Ben006 View Post
For now, until I change my mind as always, the plan is :
-Speeduino ECU from a guy in UK. He's done a few and has given me great advices so far.
-24lbs injectors (listed as mustang injectors), they are cheap and easy to find. I should be able to make them fit to the stock intake runners.
-custom fuel rails from extruded aluminum that had the correct shape already (found it on eBay too)
-80mm universal throttle body with TPS (it will require modifications to the plenum, but I don't know the extent of the modifications yet !)
-custom trigger wheel and crankshaft position sensor mount
-VW/Skoda 4 posts coils (Lupo GTi)
-Haven't decided on the fuel pressure regulator yet.

That's the big stuff, I'll need all kinds of other custom brackets, hoses and fittings, plus fitting the temp sensors etc...
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Old 03-28-2019, 04:08 PM
  #26  
Ben006
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Yes, the speeduino I'am getting is supposed to have cooling fan control. I would have got rid of the mechanical fan anyway !
I'm getting everything new, so I know they work

I've ordered the fuel rail extrusions. Just one, to try it.
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Old 03-28-2019, 05:04 PM
  #27  
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I'm interested to see your speeduino build. If you happen to hack on the source code for any of the external controllers/modules, please post the source!

Originally Posted by Ben006 View Post
Yes, the speeduino I'am getting is supposed to have cooling fan control. I would have got rid of the mechanical fan anyway !
I'm getting everything new, so I know they work

I've ordered the fuel rail extrusions. Just one, to try it.
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Old 04-03-2019, 04:04 PM
  #28  
Ben006
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I received the Throttle Body !
It's big !



Next soon
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Old 04-04-2019, 05:26 PM
  #29  
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Did you get the mounting flange with the throttle body?
I've been eying the '81 intake that I have sitting, and considering a Megasquirt 3x controlled upgrade once I have the car running and capable of being driven.
The idea of having coils near the plugs courtesy of a set of GM LS truck coil packs, and individually controllable injectors, makes me sit and think about it.

What are you planning for air filtration? Connect to the stock filter housing to keep it looking somewhat stock, adapt another car's filter box, or something entirely aftermarket?
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Old 04-06-2019, 03:26 PM
  #30  
Ben006
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Yes the mounting flange comes with the TB.

Now, my biggest problem is that the TB is quite big compared to the plenum, and it would require huge modifications to make it fit...
So, I've toyed with the idea of making a new plenum, with a bit more volume, better flow distribution, and that can easily support the bigger TB.




I could have it 3D printed for a few hundred bucks, I know it would work with a bit of reinforcing so the roof doesn't collapse under vacuum. I've actually applied for a sort of grant for "ambitious 3D printed parts" projects. I'm sure this would qualify as embitious
I can also build supports inside that will both guide the flow and support the walls.

I haven't actually worked on the car in weeks...
The alternator is toasted, I'll buy a new one, not worth rebuilding this one.

Ben
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