Iwanna928

There is a Murf Stage 1 kit for sale. It is for a 5.0L. Would it take much to adapt this to a 79? Just might be an option.

Stephen

Iwanna928

Anyone? Would the bracket be the same? I realize some of the tubes, fittings would need to be changed etc. If the bracket works and the pullies will line up then this could be a cheaper alternative to turboing.

With a wife, 5 and 3 yr old daughter, money is always a concern!

Stephen

AO

The bracket should fit. Your biggest problem will be managing the fuel. Not sure who well a BEGI would work on a CIS car or not, but in theory I think it would work. You should send a PM to "Z". He can answer your question for sure.

hacker-pschorr

He would be much better off talking to Dennis Wilson or someone else with an expertise with CIS. Mike (aka Z) and Jean-Louis gave supercharging a CIS 928 a try a couple of years ago with a Murf based setup. Long story short, Jean-Louis race car is no longer CIS. It never quite worked right.

Everything should fit up until the point where you connect to the CIS fuel distributor. None of the fuel modifications will apply.
No Murf kit was supplied with a BEGI.
The mechanical fan will have to go, the shorter belt for that conversion is not part of the kit. There is no connection for the electrical fans, would have to come up with something on your own.

As Dennis has pointed out in other threads, CIS does not like it when you pressurize the wrong side of the fuel distributor. Technically the air plate needs to be before the turbo or supercharger. This poses a major hurdle…….
As Dennis posted here:
https://rennlist.com/forums/928-foru...unt-turbo.html
The fuel distributor is between the air filter and the turbo. This would require some clever plumbing with either a turbo or supercharged CIS 928.

IMO spend some time converting the car to EFI – in the long run it will be cheaper and work much better.

I would mention something about CIS in the thread title, get some more opinions on this since I’m far from a CIS expert. I cannot wait to convert my 79 to EFI.

If all goes well, the entire injection system will be coming off my 81, it’s already adapted to a Murf setup.

Iwanna928

What does Carl's kit use to make it work? I thought fuel was not an issue at low boost, 5lbs. Looking at his kit it looks like a blower, bracket and the other parts. His Universal kit and stage 1 has nothing for fuel mgt that I can see.

I understand that EFI would be the way to go, but that is down the road if I can do it that way. I will only have so much money(Tax return). I might have to wait or put the money to other things.

I would love to have a little boost to start and build around that and slowly turn it up until I have a block and fuel mgt system that can handle 12 to 17 lbs.

Stephen

hacker-pschorr

Been there, done that - get the car running with the EFI system you want first then add boost. You will be better off, especially financially, in the long run.

We all like to put the cart before the horse, boost first, engine management later. It’s your car so do what you are comfortable with, but plenty of people have gone that route and everyone I know regrets it – including me.

If you ask Z, he will say dump CIS, no exceptions. He’s been on my case to drop L-Jet since the first day I started the car with the blower attached.

Iwanna928

Nothing is easy!

So it is the fuel dist that is the problem. I was going to use Unwired tools for CIS mgt. They have a product for boosted CIS that you can tune with a laptop to dial thing in.

Stephen

Fabio421

Theres an old saying. You can have two of the following Fast, cheap, or done right. I would argue that you could add easy to the equation. You can get major HP fast and cheap but it wont be done right. You can have it done right and fast but it will never be cheap. You can do it right and cheaply but it will take some time.

Rick Carter

Interesting

Iwanna928

Rick

What are your thoughts? Is this the missing piece to boost a CIS K-JET 928?

Stephen

AO

Well I'm glad we got the ball rolling for you here. Looks like I don't know jack about the Murf kits and the early cars ('cause I don't). I think I need to make a trip to Green Bay this spring to get re-educated.

Rick Carter

Maybe, if you have the time and expertise to sort it out. It has been used on boosted 911. I know next to nothing about CIS. I do know that doing things on your own (my car for example) involves a lot of trial and error. I have told DR on more than one occasion that if I knew he was going to put together a system I would have waited. It would have cost me less and is certainly prettier than my cobbled system. Of course I wouldn't have been able to have been driving it as soon. If Z and Jean-Louis were not able to boost a CIS 928 satisfactorily I would seriously consider asking them why not. Maybe you don't need EFI, I don't know. Also if you're intended use doesn't include DE or racing you may be OK. A lot of problems show up under prolonged boost and load that never appear on the dyno or street use.

Iwanna928

Andrew Thank you for your reply's and trying to help me. I am kinda clueless here and it doesnt seem that there are to many boosted CIS 928's. Your expertise and knowledge far surpasses anything I have learned in a short while. I am a true newbie in regards to 928's but not modifying in ford and chevy's.

I quess I am throwing darts in the dark!

Carls system must work or he wouldn't sell them and the 930 used CIS till 89 and they could have used FI but they chose not to. I'm lost as Porsche liked using CIS with boost. I believe they also used a 928 distributor.

CIS is blow thru design and I thought I read somewhere that at minimal boost it had no problem compinsating but I can't find the thread.

I have read so many threads, probably all of themand I still am lost!

Stephen

Lizard928

All the boosted 911s (930) have the CIS BEFORE the turbo.
So the airstream is CIS, Turbo, throttlebody, valves. Not Turbo CIS, throttlebody, valves. See the difference? this is what people are trying to point out. And they didnt use a 928 dizzy, they used a 6 port dizzy. They did however use the 928 dizzy on the 924GTR LeMans car running 2 injectors per cylinder to get the required fuel for the more than 2 bar of boost they ran.

If you are going to do it pull the fuel dizzy out of the engine V and mount in up by the power steering reseviour and have the SC intake pull through it.

But I will advocate at this time what others have already said. Convert to standalone EFI. It can be done reasonably cheap if you can do everything yourself. But keep in mind with the CIS starting point. You would be best to get an LH or L-jet intake manifold to start with so that you dont have to modify the injector holes.

Iwanna928

Colin

Thanks, now I picture it in my thick skull!

Stephen