karl ruiter

I am working on a similar setup. Obviously it is possible, since Carl has done it, but there are a few tricks that are required. You have three good options: 1) just buy Carl's kit and install it. Forget the PhD project. 2) call Carl and beg for parts and help. It makes no financial sensel for him to do much for you, but he is a good guy and he might. 3) convert to EFI. I am currently working option 2, but planning on option 3 in the long run and kinda wishing I had gone option 1.

Z

I'm really most familar with the 32v stuff. Since Hacker has a blower, an L-Jet and a CIS car, he'd be most likely to know what it would take to physically make it fit a '79.

I tried to help both him and Carl out just a little bit when they were working on using only an FMU on their CIS setups. The biggest problem found on Jean-Louis' car was with the warm-up regulator messing with the control pressure of the CIS. I think that it could probably still be made to work to some extent, but I wouldn't put the time of money into it if it were me.


Yup.

You mean after you send time, money, and possibly damage your engine in trying to get the CIS to work? That CIS setup on Jean-Louis' track car caused a sudden and unexpected power change because of what the warm-up regulator was doing, and it unsettled the car. That happened in a curve on the track. That car was totalled when it hit the wall. The car he built to replace it has an LH EFI setup on it, and has been working well for years now.


Even more reason to not waste money on something that you're going to end up getting rid of anyway.

Yup.

Yup.

Actually, it was even before you put the blower on the car.

I really don't know what Carl's doing now as far as fuel control with CIS. I do know that he spent a lot of time and money messing around with it in the past, and that one of the attempted "solutions" he tried that was sold by a vendor cost more than what an EFI conversion could be done for. I also know that he got rid of CIS on his car, and has EFI on it now. If you do a search on the internet, you'll find that there are 930 owners who seemed to be pretty happy getting rid of CIS and converting to EFI.

There's another old saying that goes something like "If you don't have the time to do it right, how will you find the time to do it over?" The same exact thing could apply to the money aspect of it.

Iwanna928

Alright.........I get it!

Thanks for all of your help. I can see what I wanted to do, trying to do it in stages would only cost more in the long run.

I will need to be patient..............not my strong suit in the pursuit of HP!

Stephen

dr bob

I did a high-pressure turbo mod on a CIS low-pressure Saab Turbo many years ago, added a better modulating-pressure solenoid to the control pressure circuit, built analog controller to make it all work, and then spent many weeks with the gas analyzer riding in the car getting it all dialed in correctly. The EFI systems available now are a godsend compared to trying to get all the mixtures right using just modulated control pressure. The CIS injectors are extremely non-linear even with static manifold pressure, so there's more to tuning than just changing pulse-widths on a laptop.

Lopez

Ever consider just buying a CIS euro S 4.7 motor and dropping that in instead? It's probably within your price range and you'd end up with about the same power as a low-pressure boosted USA 4.5 would...

Iwanna928

Lopez Yes I have. I understand that a CIS Euro would be a fairly straight forward swap. Lots of options and not enough money.

Honestly I am thinking about the 80 Euro that is FS. Buy that, swap the parts from my car that I like and sell the 79. Might work.

The sensible thing to do would be to fix my syncro's and maybe a small shot of nitrous and start saving toward my 928 fund.

Stephen

Imo000

If you don't have the funds to cover the project twice then you can't cofortably afford it and might want to wait a bit. There is nothing worse than for something unexpected to come up and not being able to afford to fix it. BTDT and never want to repeat it again.

Dan87951

If you decide to pass on the SC kit let me know I think im ready to boost my 87 Cassirot S4 that i just sunk a ton of money into to get the maintenance up to date!

Iwanna928

Dan87951 Looks like it will work a lot better on your car than mine! Go for it!

Stephen

auzivision

I can only assume he was talking about this one that is still listed in the classifieds:

http://forums.rennlist.com/marketpla...ct/160/cat/all

but it is long gone:

https://rennlist.com/forums/928-foru...tial-post.html

Dan87951

Can you send me the details on the kit you saw for sale?

Iwanna928

That's the link, but I quess she was sold!

Stephen

Jim Nowak

I ran a supercharged CIS engine for a few years. You can run boost through a CIS system but you need a blow-off valve before the CIS metering plate. Otherwise, it will run extremely rich under vacuum conditions.

With that said, I would recommend going to an EFI system instead of wasting the time to make the CIS work. You will get far more hp and much better control from an EFI system. CIS is just too hard to make work in this application.

Iwanna928

Jim How much boost were you running w/ the CIS before you went to EFI. How much power were you making then and how much are you making now? Also what EFI did you go to and how was the conversion?

Thanks

Stephen

Jim Nowak

I was running around 12 PSI but would not ever recommend that with the stock CIS.