touche!

Headstuds? . .. the same ones that break on the Carreras?

Ah, you must be sensitive about the comment on the whimpy Carrera (engine grenading) rod-bolts. ya really don't want to move the rev limit up on those. The factory chip got that right. :cool:

I hear very, very little about broken rod bolts on the 3.2L, I'm not sure why you SC guys go on and on about them. As long as you don't change the rev-limit they aren't much of a problem.

Head studs, yes, they break in the Carrera too.

Stange how this went from a thread about injections systems to rod bolts.........

Strange how those bolts were good enough for the turbos.......


Cheers

Not really, the SC guys are just jealous that the 3.2L cars are so much better. :cool:

:D

You're right ... You Carrera guys really like to keep that on the down-low. :cool: ... Quick, change the subject to the noise a collapsing chain tensioner makes. Ya know, I understand that if one ignores the racket of a collapsing tensioner, bad things can happen to the upper end. ;)

Well Ya . . .turbos don't need high rev's to get power.

BTW, Strange how CIS was good enough. . . THE BETTER CHOICE, for the turbos....... :D

OK - So everybody (read "THE MARKET"), besides island911, considers Motronic superior to CIS and is willing to pay more for a Carrera than a Sorta Carrera with CIS, all other things being simiar.

In all fairness, to answer the original question submitted in the subject line of this thread, "Does anyone prefer CIS over Motronic?" The answer is apparently a resounding YES! Island911 and apparently the early Porsche Turbo engineers prefered CIS. The early Porsche Turbo engineers evolved into working with Motronic in the later Turbos.

Island911 has not evolved, and should be commended for his resolve!

Well ya know Island, seeing how the SC and the Carrera have the same cam profile, neither motor has much use for high revs as well.........

Having said all that, I sold all my motronic stuff off my 3.2. I am building a 3.4 that will have either PMO's) :O or aftermarket efi with ITB's! OH, and just this morning I assemble the rods onto the crank using ARP rod bolts..........

So, take what I say with a grain of salt! :)

Cheers

Its funny how motronic is apparently such a huge advantage, yet at autocrosses Carrera drivers seem to claim without fail that a Carrera has no discernible advantage over an SC. :D

LOL -Jeremy


. . .Is that all ya've got? :D

I will admit, that EFI does a much better job at making the smog-nazis happy. I mean an injection system (CIS) that immediately dumps fuel, in to the motor, for max throttle response is just WRONG by todays standards. PLUS, the OE EFI keeps at bay that twitchy-fun-throttle behavior . . .nothing but a nice, "properly" ramped throttle roll-on --cmptr cntl'd, of course. (smart, way smarter than CIS)

island911
regarding the throttle response issue....i'm thinking the motronic fuel pressure reg may play a significant roll. there is a vacuum line connected to the regulator that causes the fuel pressure to increase when the vacuum is removed ie... when you blip the throttle. i think the increase in fuel pressure is about 1 psi per 1 psi of reduced vacuum.

there is a company that makes a regulator that increases the fuel pressure 1.7 psi per 1 psi reduction in vacuum....and they claim better throttle response.

can anyone shed some light on this?

I prefer my motronic....mostly because it's the car I own. I've only driven one SC for a short time. The shifting of the 915 was more of an issue for me on the SC vs the G50...another topic tho.

Island, thanks for the information on the carrera rod bolts. I don't recall one thread on broken rod bolts on a carrera so without your information, I wouldn't know I had a problem. :)

Yeah, it's about as common as failed SC chain tensioners. ;) ...someone has to keep these CIS/SC bashers in line.

CIS - Very robust. Much simpler to troubleshoot and test. Better throttle response.

Motronic - 1/3 better mileage than CIS. More space in engine compartment to do maintenance. Runs smoother under a wider variety of operating conditions.

ianc

Motronic is very easy to troubleshoot, if you have the manuals to show you what to check and how to do it. Most of it just requires a voltmeter that can read ohms.

Cheers