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Fri Dec 13, 2024 7:22 am

Hi all, I own a 912E and had it upgraded with a 2270 kit. The motor is a killer! However, the EFI I now have is from CB Performance (not the most recent version, this was installed @ 3 years ago) and it is a nightmare - stumbling and hiccuping all over the rev range. I've spent numerous trips to the shop to fine tune and while initially all seems reasonably fine, within an hour or so of driving (especially at highway speeds) the hiccuping/stumbling returns and it just has us all scratching our heads. Time to throw this system into the fireplace and start over... also it would be ideal if the new system was something reasonably intuitive so that most any shop could work on the car, the CBP system has some shops very confused. Thanks all!

Sat Dec 14, 2024 1:17 pm

Could it be something like a faulty sensor or a vacuum leak that is causing the issues?

I had microsquirt on my past beetle project and it was okay, but I had some stuttering issues on occasion. But would go away.

I’m going to be going with the Holley Terminator X system in my ‘67 912 with a 2387cc VW powerplant. Pretty simple setup, has a solid self tuning capability, and a lot of tuners know how to use it as it’s one of the most popular LS/V8 systems.

It’s also the kit that CB is now selling. Also places like Red-E Motorsports uses it and they have a handful of really helpful YouTube videos outlining how the ECU can be used with a multitude of intake options. Works well with both naturally aspirated and boosted applications.

Hope that helps!

Mon Dec 16, 2024 7:32 am

Bret Young wrote: Could it be something like a faulty sensor or a vacuum leak that is causing the issues?

I had microsquirt on my past beetle project and it was okay, but I had some stuttering issues on occasion. But would go away.

I’m going to be going with the Holley Terminator X system in my ‘67 912 with a 2387cc VW powerplant. Pretty simple setup, has a solid self tuning capability, and a lot of tuners know how to use it as it’s one of the most popular LS/V8 systems.

It’s also the kit that CB is now selling. Also places like Red-E Motorsports uses it and they have a handful of really helpful YouTube videos outlining how the ECU can be used with a multitude of intake options. Works well with both naturally aspirated and boosted applications.

Hope that helps!

Thanks very much, yes quite helpful. I'll look into a possible vacuum leak or distributor problem (suggested to me elsewhere)

Wed Jan 01, 2025 12:41 pm

Most fuelling problems end up being ignition ones. I would start there from experience.
Perhaps something you have forgotten needs rechecking, but will seem so obvious once found.
Jenvey dynamics, Bridgnorth, Shropshire do fuel injection conversions.
I can't vouch for them as not used them yet.