Julio Rodriguez

Hi everyone, I've got a 1983 thats been sitting for at least 6-8 years & Ive begun to look at top end refresher. My choices are to go with the Bosche MFI like the one the 3.0 RSR had with hightop butterflies, refurbish the current CIS (lines, rubber items, WUR etc.) Or go EFI with ITBs.

Im clear that any option on my list wont be cheap but I'm really just interested in making it the most reliable starter and daily driver possible. In a few months my family will move into our new house which is a 40 minute HWY drive away from the city.

Simple to maintane is the best solution as I really dont care for hp gains ect. Just a solid daily driver that wont have hot start problems like my 82 924 did. I live in Panama and its hot here 24/7 so A/C would be nice but nice but not a deal breaker.

theiceman

Okay maybe I am missing a few things ..

you talk about top and refresh , but then you go on to talk about different fuel delivery and management systems. these are completely different things in my mind and separate topics.

If you are just want reliability I would just rebuild what you already have . I find the CIS a VERY capable system and mine has not let me down in 10 years of ownership . Once set up it just purs. I rebuilt mine when i blew the airbox due to operator error and it cost 500 dollars at the time including arbox. I put it back in and has been flawless since.

There are all kinds of things you can do to increase power, but if you want reliability just rebuild what you have

BTW AC sucks in these cars even when working fine ...

GTgears

You already have an RSR mfi set up? If you don't it will cost you $20-25k to get one...

911Dave

I agree, go with the stock CIS. The others are only for hot-rodding and will result in less reliability than the CIS. They are also a lot more expensive and difficult to implement.

theiceman

we think its expensive here.. i imagine Panama isnt any cheaper

Julio Rodriguez

Thanks for the reply guys. Since the motor is currently being pulled to inspect "everything" the tech mentioned that it would be prudent to change as many parts as possible once the engine is out. The shop that sold me the sc has 3 more 911 (almost all bare) with shelves packed with spare parts. There is a 3.2L turbo engine, another 911 engine that looks to have a bosch MFI (not in the best shape) and another partially covered motor. I had spoken with the tech about wanting to go ITB, and after speaking to a tuner friend of mine he recommended using the Haltech SMS for tuning. The tech at the garage mentioned the Bosch MFI and how it would be less costly to set up, hence my interest in the matter. Over at the Pelican forums those guys make everything pretty much work so I figured I could make a deal with the shop owner, however you guys have pretty much made me doubt the entire concept of tinkering with the engine. I think I'll just focuse on cleaning up what I do have and focus on enjoying the car. Thanks

GTgears

Wise. There are some really good cis threads on pelican. You can make that car run like a top without changing what you have e.

altonj

MFI would not likely be less expensive than setting up a standalone ECU with ITB's... Plus the modern ecu provides more tuning potential in the areas of power, drive ability and efficiency. It is good advice to replace all that NEEDS replacing while you are in there, but upgrades come down to budget and wants/desires.

One can make the CIS system perform perfectly well on a warmed over motor without the expense of new throttles/ecu tuning etc...

Cheers

Julio Rodriguez

So far so good. After talking with a local air cooled specialist I've decided to add a high flow fuel pump (he said a 404, I'm thinking a Walbro) replacing all the fuel lines with stainless steel braided fuel lines, adding an aero motive fuel pressure regulator on the return line with SS lines back to the tank.

I might just fly back to LA to meet up with a CIS shop in person so I can see the CIS/ WUR refurbishing process & hand over my old unites for fresh ones. Does anybody have a recommendation ? I'd only be in town for the day, but I would very much like to get some stuff in film to use as a sticky in the future.

Julio Rodriguez

Panama is the Dubai of Latin and Central America so nothing is really cheap here, except the local beer. Since all our Porsches (and all other Euro cars) come from Europe it's tough getting parts. All my 120i Bimmer performance parts ha to be purchased in Europa, that really sucked because nothing was available in N.A. Since air cooled Porsches like the sc have been around for a long time I'm hoping to not have the same issues finding parts from N.A vendors and EBay sellers like I experienced with the 120i

theiceman

Given this and your technical ability, I would definitely rebuild what you have , it can be done very affordably.

Amber Gramps

Talk to Dave at TRE Motorsports in Burbank if LA is your preferred destination.