EFI options for 2.7

[naro914]

Hi all,
I have a 2.7 engine in my 914, that currently runs on weber carbs. I've been thinking about my options because quite honestly, I'm tired of the hassles of carbs - cold start, jetting issues up in the mountains, relatively temperamental, etc. and they are IDS carbs - great for racing, not great IMO for street use.

Anyway, other than the factory CIS system, is there any good aftermarket options for a stock 2.7 engine?

The thought came to me as every time I jump in the 993, it just starts and runs flawlessly. No issues, not thinking about it...just runs. I'd love that with the 914. the 2.7 engine in it runs great, but every once in a while, the carbs act up and need "attention". Kind of takes away from the fun of driving it.

so..any ideas on EFI options?

thanks

[sjf911]

Going from carbs to EFI would require changing induction to a common plenum such as the 3.2 or to ITB's. Significant fuel delivery changes would be required as well to get the necessary fuel pressure to run EFI. In addition, an ECU vendor would need to be chosen to control it. You might get away with buying a discarded CIS intake/TB setup and using the TBitz EFI conversion kit for CIS systems as the cheapest. A 3.2 intake would require some modification of the intake ports on the head to match. It is doable but ultimately expensive and time intensive to get the tune correct.

[stlrj]

More cost effective to swap the 2.7 for a 3.2 while retaining your sanity. Reinventing the wheel only leads to frustration.

[Halm]

Dave Brown up at SpeedWerks does a lot of Motec conversions. He did Paul Thomas's 3.5 and it now starts and runs like a Honda.

[longhornchris04]

If it were me, I'd try to get the CIS system off someone who is converting to carbs and get the Tbitz kit. You might find someone who is tired of fiddling with the misc CIS components and is parting out the system.

The other EFI options involve ITBs (i.e. very expensive ) or trying to retrofit the 3.2 intake... which may not play nice with the 2.7.

Another option (and still expensive) is to swap for PMOs, which are still carbs but based on what I've read are less temperamental.

Good luck.

[naro914]

Well...I was hoping someone would say "sure, so-and-so makes a perfect EFI system for early 911 engines, etc. etc. etc...."

So...we'll probably end up staying with carbs, and definitely go to PMO's, mainly because the race car has PMO and I'd like to keep only one set of jets and everything. This way I always have a back up system between the two cars...

Anybody want to buy a set of Weber 40 IDS Carbs? Honestly, their really good carbs, but for everyday street use, I just figured EFI would be a nice option.

Anyone every SEEN IDS carbs? They have a special extra fuel circuit for full throttle application. Pretty cool actually...

[RoninLB]

[QUOTE=naro914;4923587]

"sure, so-and-so makes a perfect EFI system for early 911 engines, etc. etc. etc...."
------ Individual Runner/IR induction and carbs need to be set up by someone who doesn't believe more gas is better. Another routine issue is over setting the accelerator circuit. Granted PMO are the cat's ass in tuning but Webers can still be fine.

So...we'll probably end up staying with carbs, and definitely go to PMO's,
------ PMO's can be set up rich and sloppy also.

Anybody want to buy a set of Weber 40 IDS Carbs? Honestly, their really good carbs, but for everyday street use, I just figured EFI would be a nice option.
------- You want performance? Go MFI and get hard every time you accelerate in a much wider rpm range than carbs.

Anyone every SEEN IDS carbs?
special extra fuel circuit for full throttle application.
Pretty cool actually
------ Really cool
and trick if you have any use for that extra fuel circuit. That option is an expensive up-grade on Webers that don't have it. IDS is worth big bucks relative to Webers that don't have it. Problem is most guys don't know about it. Research your carbs and seek a premium. I sold a set that needed full rebuilding for $500 more that comparable Webers without being IDS.


party hearty




all above only my take on things

[rvanderpyl]

Check here CLEWETT ENGINEERING: Peformance and Innovation