When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I have a set of Bosch 0280150947 / 4 hole injectors / bought from https://www.fiveomotorsport.com
Worked fine on the car, I changed them because I busy with Rotrex on my car and needed bigger injectors.
DM me if you want them...
Can you check the actual parts number on the injectors? Maybe a photo would be nice too.
Yours is also a twin distributor 928S 310hp I suppose, 84?
Right now the car is at the mechanic's shop and it is a '86 twin distributor ["S2"]. Going through my correspondence with bavarianwerke however I found out that my original injectors were 0280150254 , High 16 Ohm and the replacement parts purchased from them are 0280150988. Hope this may help a bit.
Panagiotis
Right now the car is at the mechanic's shop and it is a '86 twin distributor ["S2"]. Going through my correspondence with bavarianwerke however I found out that my original injectors were 0280150254 , High 16 Ohm and the replacement parts purchased from them are 0280150988. Hope this may help a bit.
Panagiotis
That is different from the PET for our cars, but maybe they changed this on the later 86?
That is different from the PET for our cars, but maybe they changed this on the later 86?
Frankly I have no idea. It is possible that one previous owner may have changed them at some point (it has 180k miles so I would not rule that out). In any event they assured me that those I have purchased are “correct”. I understand they are the same injectors Karsten had bought
The car is currently back at the mechanic for the broken cam cover gasket.
I currently have the injectors from @kingwildh: bosch 0 280 150 947 and the set that was in the car (yellow fittings, 0 280 150 252 printed on them, but no bosch logos) on which it was running rich, even with the MAF pot turned all the way down (leanest setting).
The bosch injectors were now tested against the injectors in the car: it seems they will spray even more fuel than those I have now!
LEFT is bosch replacement from @kingwildh, RIGHT is what I had installed already.
I guess my car will not run any leaner with these Bosch injectors in it, right? Or should I at least give them a try?
FYI: both ECU's and the MAF have been thoroughly tested by JDS Porsche and work fine. Fuel pressure in the rails is according to the WSM, pressure regulators and damper are new. Temp sensors are new, vacuum is present at the LH. What else am I missing here?
This thread is due an update!
I've been busy the last couple of weeks with my wedding day. The final weeks before the day were a struggle to get everything right, you can't believe the incompetence of many a supplier in the party business!
It took all my attention, but we had a perfect day in perfect weather!
So, the mechanic had ordered a set of injectors from Roger at 928srus, but they arrived too late. I needed the car for my wedding day, so I picked it up the week before with a used set of original 40y old injectors installed as a temporary measure.
Driving home from the mechanic, I managed 12,03 l/100km (19.56 mpg). That is 240km at a constant 100kmh through The Netherlands, and a constant 125kmh in Belgium. This trip is almost ideal for mpg figures.
In comparison: after the engine rebuild, the car did 17,16 l/100km (13.71 mpg) with my own injectors on the same road (but colder temps).
So the 40y old injectors lead to -30% fuel consumption, with a MAF at 380 Ohm and 2.66%vol CO!
In the meanwhile I did another 293 km around town using on average 19,05 l/100km (12.35 mpg). The last 332km were more mixed roads (some longer trips on the highway) and it needed 17,63 l/100km (13.34 mpg).
I would try to set the MAF a bit leaner to reach 1.5% CO, but I received the set of new injectors from 928srus so I will install those first.
I must say I'm a bit sceptic as these new injectors look exactly the same as those I had installed to begin with, which were new since 2018: yellow, with a Bosch parts number on them (0 280 150 252), but no other brand names...
Anyway, these are new, so let's see what they will do in the car.
I'm currently having a surging/jerking anywhere between 1000-2200 rpm, driving at low speeds with a very slight and constant pedal input. It may be present at higher speeds too, but far less noticeable. Would this simply be the 40y old injectors, or are there other possible causes?
I'll see how it drives with the new injectors first. Chances are it is solved with those. A job for the coming weeks.
In the meanwhile, a pic from my wedding day, still waiting for the professional photos..
Well, first of all, best wishes for the long family trip you are about to enter into!
Your surging issues are similar to mine [S2 - 1986] and my mechanic is of the opinion that the injectors were the culprits. He is about to change them now with new ones from bavarianwerke [Karsten has installed the same to his car], so I will be looking for an improvement.
I'm not done with the injectors. Both cars have under full trottle an AFR from 8,5. CO is at 1%. MAF s are new. For my feelings this is too rich but I haven't yet the time to dig deeper in it!
Thanks PK68. We've been together for 21 years, so I don't expect too many novelties :-).
I've checked bavarianwerke too, they had different types of 'perfect replacement' injectors at several times, but never large stock. For the moment, they have 2 types, one of which is definitely 2 hole. Their previous offerings were all 4 hole. None of them in stock anyway. It's hard to find exact details, I did not get an answer from bavarian to what the differences were between both sets when they were still both available (at €450 and €500).
I waited until I checked out everything else on my car before getting new injectors (since mine were new from 2018). Finally found they were indeed (at least part of) the cause of my consumption. Bavarian has no stock, so I have a set from 928srus. I'll try to install them today.
It took me a bit longer than I expected, but the new injectors are installed.
The rubber hoses were quite a bit longer than what was installed in the car, I was unable to connect all the hard fuel lines to the rails, so I got everything out again and shortened the hoses a bit.
It is still a rather tight fit and the hoses are not 100% straight from injector to rail (because the rail is pulled by the lines to the fuel pressure damper and regulators), but there are no leaks, so I'll let it be. Forgot to take pics after mounting the airbox and tubes.
It started immediately and it runs very smooth now. Went for a short drive and did not notice the jerking at slow speeds. Will drive more tomorrow (200kms or so). CO will have to be set again too, I'll check when I can take it to the garage to measure the exhaust.
All is good for now. Curious what the consumption will be!
I installed a set of injectors that looked like Bosch injectors on my GTS and it would not run correctly. If the injectors don't have Bosch logo on them, they aren't Bosch but probably Chinese. My GTS never ran right until I put another verified set of Bosch injectors in it.
The Bavarian Werks Bosch injectors run smooth and I just drove 500 km with one tank. Country roads, stop and go and 300 km Autobahn with speed between 100-180 km/h.
I estimate 15 l /100 km and will fill the tank tomorrow.
Jochen told me the S cars run rich at full throttle but how rich?
Greg use S4 computers with knock detection and lambda probe. Would be a better system.
I did an average of 17,22 l/100km over the last 425 km with the new injectors (no CO calibration done yet). I did a mixed trajectory of highway speeds and stop and go traffic. I was using the AC for maybe 1/5th of the time.
At least my consumption did not go significantly up, so the injectors must be performing better than those I had originally installed (which looked 100% identical). Next up is the CO calibration. Let's hope I can get to 1.5% without maxing out the MAF pot (to 0 Ohm).
03-26-2024, 07:35 AM
