cis or euro injection on 16v?

Re: cis or euro injection on 16v? (JETTA2.0GT)

How exactly do you modify the fuel head?

Re: cis or euro injection on 16v? (DCIvwRadar)

You don't need to bypass the VSS. Yes, your ECU will generate a fault code, but it is not one of those inputs that put your engine management into "limp home mode".
You can also dispense with the solenoid valves for the charcoal canister (won't even show a fault code).
Having owned a few L-jets in my time- I really can appreciate the simplicity of the CIS systems. Actually, the first Jetronics were the truly horrible D-jet (manifold pressure controlled) systems used on the early Porsche 914s. No thank you, no thank you, no thank you...
Even with the inherent limitations of CIS- the smart 914-4 owners are scrapping their troublesome APC (L-jet) and MPC (D-jet) Jetronic systems, and adapting CIS setups- gaining reliability and power at the same time.
And yes- the original 930, as well as the early 928-- was CIS...

Re: cis or euro injection on 16v? (BFDeihl)

Yes, the VERY early Jetronics had their teething pains, but these predated many of our cars by 20 years! D-Jet's MAP sensored system is today the best way to go, NO RESTRICTION AT ALL! Compare that to the massive flow plate of the CIS which demands that the air into your engine use only the mechanical advantage of the lever arm to overcome the full fuel system pressure that's trying to keep the fuel distributor pin down! (Have you ever tried to force one in with your fingers? Do you really want to waste the energy of your airflow doing that?) The Porsche dabbling with CIS was a mistake they quickly corrected. CIS certainly has its places. For a pure mechanical system that will work and work, it cannot be beaten. But start adding lamba sensored, closed loop operation, then add ignition control (CIS-Motronic) and it actually ends up more cumbersome, less reliable, and less accurate than a simple REAL EFI system. L-Jet is only marginally better since the AFM is still a rather large restriction, but it does have much higher potential. The Porsche 944 Turbo S made 255 hp stock running L-Jet.
Today, if you want a high revving, high HP system, look to the many aftermarket ECUs. You can have it all, MAP sensored (zero restriction) metering, distributorless ignition, custom intake (twminduction.com has an nice looking unit for about $300, less than many of the 50mm ones go for used!), and the ability to tune it as good as it can be. I would suggest checking out SDS (cheap, effective), Electromotive's Tec-II, Haltech, or maybe even MoTeC ($$$$).
"CIS" and " high performance" simply don't belong in the same sentence unless there is a negative of some kind in there.

Re: cis or euro injection on 16v? (Penguin)

Oh yeah, if you're into the electronic hobbyist thing, check out the MegaSquirt, a real DIY EFI system that can be made for around $150! It won't do ignition, but with CIS-Motronic the ECU is mostly an ignition computer anyway (only DPR current and cold start injector has any effect on the fuel system), it shouldn't get too mad if you just put resistors across those terminals.
Here is the URL: http://www.bgsoflex.com/megasquirt.html

Re: cis or euro injection on 16v? (Penguin)

LOL. Too bad the distance between Texas and Washington State makes it impractical to "run for pinks".. You really got an aftermarket setup running THAT well on your car, Penguin?
Can your Passat really smoke a 930? Or a 928?
If it can, I salute you. I absolutely don't mean this as a flame. Big internet world it be, you gotta expect SOMEBODY to dog you for the above statement. I just happen to be monitoring the thread.

Re: cis or euro injection on 16v? (9A16V)

Amen Alex. And I'm VERY happy to see you sign on to this post. Which by the way- was originally entitled "CIS or Euro Injection on 16V?"
I'm not against aftermarket EFI. If I was running a ITB setup or a turbo I would be 100% in favor of a custom injection/ignition setup. It is truly the "only way to go".
For a setup running a 16V "out of the box"- especially a "virgin" install, going from an 8V to 16V--- I would wholeheartedly endorse bypassing CIS-E altogether and going for a (similarly priced) CIS-M conversion. Given the information in the Bentley manuals- it really isn't that hard.
Bosch knew CIS had it's limitations. But like MUCH of what we see OEM, the limits weren't so much "performance" as it was emissions.
BTW, Penguin- "Megasquirt" ain't all that new ...

Re: cis or euro injection on 16v? (BFDeihl)

Come now, I don't think there has ever been a clearer case of comparing apples to oranges. If you had kept reading my sig you would notice that I clearly state the car is bone stock. You're right, no EFI system can make my car into what it's not: a 3000lb, underpowered, family sedan. That is partly why I bought the MR2: smaller, lighter, with more performance potential. Is it possible to get some amount more than stock performance out of CIS? Yes. Is this amount lower than what you would gain if switching over to a less restrictive, more accurate EFI? YES. How many people on the board are running 200hp all motor 16Vs on CIS injection? If they exist, please speak up.