• Advertisement

Any EFI conversion specialists out there?

Race related chat
Forum rules
Have fun and play nice.

Any EFI conversion specialists out there?

Postby KenJ » Thu Jan 05, 2017 2:15 am

.... just picked up a MegaSquirt 3.0 with Clewitt style crankfire from a fellow who decided to go back to carbs....... ?? It was built for a 3.0 liter like mine and was running/working. I'm gathering up a bunch of schematics, diagrams and instructions on the internet and have a half confident feel at this point for pulling out my CIS and getting all the new hardware installed. But, there are a lot of wires dangling around this stuff and I'm saving my questions to the manufacturers of the various parts until I feel I'm ready to half intelligently discuss and to go forward.

So, in keeping with my fact finding and research strategy, is there anybody out there that wouldn't mind discussing the conversion with any pointers as to what not to do?

Current pieces of the system:

Wide-band O2 sensor with Innovate LC-1 (needs to be calibrated frequently - thinking of spending a tad more and going with AEM)
Crankfire with Clewitt 58 tooth wheel
Coil pack - batch fire
Cylinder head temp
Intake air sensor
Fast Idle valve sensor
As a Bonus = Relay board with relay for ECU (MS 3.0), Fuel pump (my car doesn't have a relay - so another bonus) and Fast Idle valve. This really helps with wiring to a labeled panel.


thanks,

kj
'73E... the "mild" sleeper
KenJ
 
Posts: 330
Joined: Fri Apr 23, 2010 5:01 pm

Advertisement

Re: Any EFI conversion specialists out there?

Postby WhuGmiT » Fri Jan 06, 2017 6:20 pm

Hey Ken -

Sounds like a fun project!

Unfortunately I have no useful advice to offer but I do bid you good luck.
Looking forward seeing you out slaloming with us this 2017 season, especially since you didn't get a whole lot of seat time in 2016.

Cheers,
-WhuGmiT
'68 912 Coupe, AX13
User avatar
WhuGmiT
 
Posts: 306
Joined: Sun May 30, 2010 11:49 pm

Re: Any EFI conversion specialists out there?

Postby KenJ » Fri Jan 06, 2017 8:08 pm

Hello Joe - thanks for the moral support. I'm not sure about how much time to play in 2017 either.... the other hip is due for some after-market parts.

kj
'73E... the "mild" sleeper
KenJ
 
Posts: 330
Joined: Fri Apr 23, 2010 5:01 pm

Re: Any EFI conversion specialists out there?

Postby grant » Tue Jan 10, 2017 8:13 am

Never done a Porsche but Nissan took a little work but then I had never built before 4.0 high compression stroker running C85'. Also had weird mix of both 350 z top end and 370 Z bottom end. Had some issues initially with flywheel trigger but eventually configured software.

I'm assuming these guys have tuned to this motor as long as you aren't changing parameters greatly you should be ok. dont know much about their system? Can you tune it? Or know of someone who can on dyno? I found huge power gains working with top notch tuner . We were making 420 WHP with silly $8000' race motor built with Nissan truck crank and GM fuel sensor for e85.

I'm all for EFI!
2010 Cayman S - Elsa
2015 Boxster S - Pearl
User avatar
grant
 
Posts: 5942
Joined: Wed Jun 30, 2010 5:04 am

Re: Any EFI conversion specialists out there?

Postby KenJ » Tue Jan 10, 2017 10:03 pm

Hi Grant,
... there are a couple of reasonably close tuners that will either be Dyno based or a street tune (way cheaper). I really like the Dyno guy, but almost $500 to go through the MS 3.0 completely (lots of features).... at least half a day. I'm not looking for hot rod results, but do anticipate good gains in power and efficiency. The car was dyno'd 2 months ago and was at 180+ rwh (went to only 6k rpm) with a rebuilt Euro 3.0. Been told it wouldn't be unreasonable to gain about 10%. When the car is running well, it's really quite fun.

kj
'73E... the "mild" sleeper
KenJ
 
Posts: 330
Joined: Fri Apr 23, 2010 5:01 pm

Re: Any EFI conversion specialists out there?

Postby grant » Wed Jan 11, 2017 5:49 am

Tuners are worth their weight in Gold. One of original founders of Cobb tuning tuned my car and ultimately he bought my car. He gained 15 % from where base line tune got us.
2010 Cayman S - Elsa
2015 Boxster S - Pearl
User avatar
grant
 
Posts: 5942
Joined: Wed Jun 30, 2010 5:04 am

Re: Any EFI conversion specialists out there?

Postby Chris Hamilton » Wed Jan 11, 2017 8:16 pm

If you are interested in going the DIY route as far as possible the megasquirt website actually has some really good documentation for the system and process tuning it.

http://www.megamanual.com/MSFAQ.htm

You could likely get the car running and driving yourself and then look at the data and make small adjustments from there. Then when you are ready you could take it to a tuner for some fine tuning on the dyno, saving you a lot of shop hours.
User avatar
Chris Hamilton
 
Posts: 696
Joined: Fri Mar 26, 2010 6:13 pm
Location: Berkeley

Re: Any EFI conversion specialists out there?

Postby KenJ » Thu Jan 12, 2017 7:59 am

Thanks Chris... yes, and this happens to be a DIYautotune system (MegaSquirt) and I've copied many pages from them. I also have the instructions from "Bitz" EFI which is one of the effective, but lower budget systems using the MS 1 (adj. AFR only). The Bitz instructions are very helpful - basically the same type parts. I've almost completed my own schematic for the components and their wiring to the relay board. It helps me get my mind around the install... kind of like practicing. I don't think I'm going to be able to physically do the swap out however and just talked with my friend and mechanic about getting on his schedule. He wants one of my hard to find parts from my 3.0 CIS and we may work out a little trade in the mix.

kj
'73E... the "mild" sleeper
KenJ
 
Posts: 330
Joined: Fri Apr 23, 2010 5:01 pm

Re: Any EFI conversion specialists out there?

Postby Chris Hamilton » Thu Jan 12, 2017 8:55 pm

Sounds like you are pretty well prepared then.

One argument in favor of keeping all of the original injection parts is that you could end up needing them in the future.

While Pre-1976 cars don't need to be smog tested in California every 2 years, they are still required to retain all of their emissions equipment. In the unlikely case that you got pulled over and ticketed by the CHP for having a modified car you would need to put the CIS back on in order to pass smog to get rid of the ticket.

It doesn't happen often but it's a somewhat traumatic experience when it does happen.
User avatar
Chris Hamilton
 
Posts: 696
Joined: Fri Mar 26, 2010 6:13 pm
Location: Berkeley

Re: Any EFI conversion specialists out there?

Postby KenJ » Fri Jan 13, 2017 1:24 am

So you're saying my '73, which doesn't have the original motor, still needs that motor to have all the stock features concerning smog?.... Even though the car doesn't require a smog check because most cars this old can't find parts to restore to original. Interesting: if a cop could tell the difference, then he must be very old and a club member. But then, what club member would report a fellow member? :o

Also, interestingly, my move to EFI will be far more efficient than CIS..... wonder if that would convince a judge? m:<

thanks,

kj
'73E... the "mild" sleeper
KenJ
 
Posts: 330
Joined: Fri Apr 23, 2010 5:01 pm

Next

Return to Paddock area

Who is online

Users browsing this forum: No registered users and 24 guests

  • Advertisement
cron