CIS to EFI kit

[tbitz]

Scott,

This is the AAR. This is needed in the EFI conversion. What sometimes happens is the valve stays stuck open. You can remove it and place it in your deep freezer overnight and see if the valve opens. Then place in stove at 70C and see if closes.

Make sure you have the connector hooked up to it as it has a small heater to open/close the valve.

You can remove the other components that feed the same line. Be sure to plug any open holes in this line. Also do not use this line as a source for your MegaSquirt vacuum.

Cheers,

[Scott R]

OK, my install is done! I took my first long drive today since my install started and it's great. I have my CO parked at a nice .5% and she really cruises! Starts with just a tiny click of the key hot or cold, and man the throttle response is good.



I know my engine compartment is not the cleanest, but it's low on my list.

[Won]

One question for those who have done the conversion: how much improvement does the EFI make in terms of MPG, especially for a later 3.0L? If I can get something between low to mid 20's, mixed driving, then I'll be able to recoup the cost for conversion in about a year and save on gas big time from then on. My CIS work ok without too much issues, so I'm thinking about the conversion primarily for better fuel economy. Thanks!

[wswilburn]

Let's assume you go from 18 mpg to 25 mpg (I don't know what to expect, but this seems optimistic). If gas is $3US/gal, you go from paying $0.17 to $0.12 per mile. If the EFI conversion costs $1700, it will take you 34k miles to recover the cost. For me, I'm looking forward to better throttle response, better overall running, and not having to replace increasingly expensive CIS components.

[Scott R]

Originally posted by wswilburn
Let's assume you go from 18 mpg to 25 mpg (I don't know what to expect, but this seems optimistic). If gas is $3US/gal, you go from paying $0.17 to $0.12 per mile. If the EFI conversion costs $1700, it will take you 34k miles to recover the cost. For me, I'm looking forward to better throttle response, better overall running, and not having to replace increasingly expensive CIS components.

That's where I had my goals set as well, these EFI parts SAN's the amazing job Tony did on the fuel rails are all readily available from many sources. And if I say need larger injectors at some point, no problem, or if I want to change out the computer, whatever I can dream up.

[Won]

US$4.2/gal here. I'm getting anywhere between 15 and 18 mixed MPG but overall it would close to 16. I drove 10k miles last year for about 1/3 of "daily driving". Let's say EFI can give 20 MPG (hopefully a little higher than that). Put all the numbers together and I get $1300. Ok I was wrong about recouping it in a year but that's pretty close I think. Better response and running smoother, cleaner wouldn't hurt either. Besides, who knows how much more expensive gas will get

[Scott R]

Originally posted by Won
US$4.2/gal here. I'm getting anywhere between 15 and 18 mixed MPG but overall it would close to 16. I drove 10k miles last year for about 1/3 of "daily driving". Let's say EFI can give 20 MPG (hopefully a little higher than that). Put all the numbers together and I get $1300. Ok I was wrong about recouping it in a year but that's pretty close I think. Better response and running smoother, cleaner wouldn't hurt either. Besides, who knows how much more expensive gas will get

I can't answer your question, however I can tell you I can run as lean as .3% and I can do it with a idle as calm as a mill pond.

[tbitz]

Originally posted by Scott R
OK, my install is done! I took my first long drive today since my install started and it's great. I have my CO parked at a nice .5% and she really cruises! Starts with just a tiny click of the key hot or cold, and man the throttle response is good.

I know my engine compartment is not the cleanest, but it's low on my list.

Great to hear you got her running nice and smooth.

Send me your ".MSQ" file and I'll add it to the database for the benefit of others.

Cheers,

Tony

[Scott R]

Originally posted by tbitz
Great to hear you got her running nice and smooth.

Send me your ".MSQ" file and I'll add it to the database for the benefit of others.

Cheers,

Tony

Tony, I LOVE it! I have a few small areas in the table to tune out, really I just need an assistant to operate the laptop or car while drive around. One I get a little more tune into the table I'll send it to you.

[tbitz]

Originally posted by Won
US$4.2/gal here. I'm getting anywhere between 15 and 18 mixed MPG but overall it would close to 16. I drove 10k miles last year for about 1/3 of "daily driving". Let's say EFI can give 20 MPG (hopefully a little higher than that). Put all the numbers together and I get $1300. Ok I was wrong about recouping it in a year but that's pretty close I think. Better response and running smoother, cleaner wouldn't hurt either. Besides, who knows how much more expensive gas will get

I did a 200Km trip last week (Ott to MTL) and monitored fuel consumption (who isn't these days ). I got 9.6L/100Km which is about 24 MPG (US). I drove fairly steady at ~110Kph.

Going into work which a 1/3 city 2/3 highway I get about 12 L/100Km which is about 20 MPG.

I have a 1978, which has the lower compression. The later years with higher compression should be doing better.

[Won]

Thanks Tony, that's what I wanted to hear.

[JohnJL]

Hey Tony,
I fired up mine for the first time today...what a great feeling! I ended up 'wildcatting' my own system from different bits because my rebuild goals weren't street-oriented but your advice, suggestions and site were an awesome resource. Thanks so much!

Megatune didn't read my LT1 A/F sensor or MSD tach signal (with the MSD Tach adaptor) so I killed it after a minute and have some work to do still.

Here's my setup for others with questions or suggestions:

83SC 3.0 ROW motor is the donor.
11.2:1 JE Pistons
Stock distributor (for initial timing and tuning until I hook up the twin-plug EDIS units)
MSD AL6T and tach adaptor
MSD Blaster2 coil
Entire new electrical system based around Painless 12-circuit fuse box
DR20 Cams from Camdoctor
Boattailed mains
head intakes opened and flowed
bursch headers...no muffler (yet, then its a 2-in-2-out Flowmaster)
Aluminum Carrera intake
K&N 7.4L Cummins Diesel intake cone and filter shields
Accel 26lb injectors

Do you have a directory of cars/their msq files available for sharing? I'm happy to share mine, though as I said I only know it will start it and have not done any adjustments or have a log file yet.

Thanks again!

[tbitz]

There is one person that has a similar setup. I'll see if I can get his configuration file for you.

[Mukilteo911]

Can someone point me to where and how the BITZ system handles the following: (could not find in manual)
1. Acceleration after the vacuum reaches atmospheric ( I hear this is an issue over about 4K)
2. How Idle is maintained (does the system go into idle mode by vacuum at a certain pressure?)
3. Can it be used with a S cam or is that too much for the vacuum sensor to handle with it's reversion?

[gsmith660]

Go to this website and ask Tony he will have all the answers you need.

http://bitzracing.com/

[cmonref]

Mukilteo911:

1. There is no acceleration after the vacuum in the manifold reached atmospheric. That occurs with the throttle wide open .... There is, however, increased RPM at this condition, which it taken care of by the VE tables.

2. Idle occurs when the throttle is closed. The ECU continues to calculate and introduce fuel based on MAP, etc. There is no closed loop idle control in tbitz's system.

3. Yes, it can be used with S cams. With individual throttle bodies you have to "handle" the six inputs thru a plenum to smooth the reversion. That has been quite frustrating to some.

[carslutt]

wow lots of good info here!.....

has anyone tried to use a "weld in bung" for the act of converting a CIS manifold to accept EFI injectors?

iv been looking at using these....

http://store.summitracing.com/partdetail.asp?autofilter=1&part=ACC-74740&N=700+115&autoview=sku





or these epoxy in style?

http://store.summitracing.com/partdetail.asp?autofilter=1&part=MSD-2145&N=700+115&autoview=sku




and for a fuel rail iv been looking at these......

http://static.summitracing.com/global/images/prod/large/msd-2115_w.jpg



just weld in some stainless tube and such...... one thing i haven't found is weld on stainless AN fittings for the ends.

[whiteSC59]

how much is total kit?

[sjmmam]

Greetings from Australia

I have spent a wonderful hour reading this thread and was wondering is the kit available in Australia? If so what is the price? Oh and what sort of support is there to iron out any bugs?

Regards

[Devil Dog Mosport]

Hi All,
Without reading through the whole string... How have everyone's experience been with converting the CIS to EFI using this kit? I am fed up with the CIS and a Porsche Shop in Maine tells me this is the way to go!!

comments.