I've had the stock injectors in the car for the past week. The fuel economy has gone way up. I got 30.5 mpg on my way home from where I keep the race car yesterday (about 25 miles) Much less soot on the exhaust pipe tips as well. Its not as snappy with these injectors, but the mixture seems to be much better. I think they will be worth a try with the bigger intake cam.
Will
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I didn't pull the plugs to have a look. Based on the mileage I figured they would be sooty. I might pull them next week and have a look-see after I get some miles on the stock injectors. The regulator hose looks ok, but I should replace it. I also replaced my fuel pump back in early December. (It began working intermittently one night and I had a new one on hand.)
I think the injectors I pulled last night could work really well if the engine were tuned for them. The other possibility is that they might be fantastic with my Evo2 intake cam installed. With my IIGO SS91 chip its thought that the chip would be a little lean for the cam, but with the injectors as rich as they are, with the cam, it might be a very good combo. I might investigate this in the future.
At this point I'm going to monitor my fuel economy and see if it improves. If not I'll guess that my motor is very tired and leave it at that. I'm not done with the injector experiment, but at this point I'm putting it on hold.
WillLeave a comment:
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Will, that's fair enough, and many thanks for giving this a try, it's been an interesting exercise.
I'm still playing around with different injectors, although I had a problem with the fuel pump refusing to work last week, which left me trying to get to work - I have a replacement pump on order. I changed from the Bosch X5DTC sparkplugs to the slightly hotter Y6DC plugs used in the E34 M5, but the car quickly began to protest, and I have since removed the 155715 injectors. I replaced them with 0280156048, which did improve matters, but I still wasn't happy with it, so I decided to try to find a split flow injector. I had looked at 0280155865, which uses a USCAR connector (which may still be a possibility), but I soon found 0280156211, which is used in turbocharged Rovers. Interestingly, the operating pressure of these injectors is 3 bar, but the pressure regulator on the Rover gives a maximum pressure of 3.5 bar. I installed these injectors at the weekend, and my car once again drives as it should. BTW, whilst I was at it, I got the sparkplugs out and they looked so much better. How have you found the hotter plugs ? I also wonder how great an effect fitting a fresh fuel pump will have on things.
One final thing, is the vacuum pipe on your fuel pressure regulator in good condition ?... I replaced mine at the weekend, as it was looking a bit ropey !... I had a major air leak develop suddenly on that pipe a number of years ago, and it was a disaster for the fuel consumption.Leave a comment:
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So after doing 800 miles with dismal fuel economy, I think I'm going to install my stock injectors and see what happens. I like the way the car starts on the modern ones, but it just runs too fat on the freeway. 23 mpg is not cool, especially when I know it used to pull 27.5-28 at 70 mph.
WillLeave a comment:
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I'm still running the 0 280 155 715 injectors. I think my biggest issue is that the engine is tired, and needs a rebuild.
I will say the car starts (usually) far faster than with the stock injectors. Usually it lights off in one or two revolutions of the crank (the way a modern car should)
WillLeave a comment:
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Will,
Are you still using the 028020155715 Injectors with the hotter spark plugs?
Or did you switch to the 0280156048 Injector?
Hope you get your car sorted out.
B.JayLeave a comment:
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There are a few places it grounds. None of which I messed with. The alternator grounds to the dipstick support, and I also ran a separate ground to the block. The block grounds to the body off the transmission bolts, but I also added a ground that comes off the back of the head and goes to the shelf where the coolant tank is. (Because you can never have too much grounding.)
I had a couple of weird issues yesterday. I went to start the car and it would crank but not fire. I turned it off, waited a second, then tried it again with the same results, then stopped, and tried it a third time where it fired up and ran fine. It did this twice yesterday. It was very odd. I wonder if my flywheel triggers are starting to go bad? This morning it fired up instantly. Drove great on my way to work.
WillLeave a comment:
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Will,
Interesting. The only thing I can think of that might change with replacement of the alternator would be the engine earthing. Now I think if it, I don't actually know where the earth strap between the engine and the body is. Mine seems fairly happy at the minute, but like you, I haven't yet had the new plugs out. Let me know what yours are like after the road trip.
Cheers,
Dave.Leave a comment:
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I haven't pulled my warmer plugs yet but for a while it seemed that nothing had really changed, then one day the car seemed to run better. No changes. I haven't taken any long trips to see what the mileage was but the car seems to feel a bit brighter. Also, I just installed a new alternator and again, the car seems happier. I'm thinking about a 600 mile road trip toward the end of hte month. That should say a lot.
WillLeave a comment:
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Bosch Gen III (EV6) injectors for S14 engines
Hi All,
We're another 14 months on from my last update, and rather than abandon the subject, I thought it a good idea to keep the forum apprised of goings-on on both sides of the pond.
BlackbirdM3 told me that the spark plugs on his M3 had become fouled - a problem that I later found that I had also. BlackbirdM3 asked if I thought slightly hotter plugs a good idea, and I said that for a standard road car, I didn't see why not. The talk of sparkplugs made me think, and after a lot of E28/E34 M5 base research, I decided to to the same. So, I removed the standard Bosch X5DTCs, and replaced them with set of Y6DCs.
However, there were a couple of unfortunate side-effects: My car developed a momentary stutter under moderate load at low RPM, and under light loads at low RPM power delivery became decidedly jerky. I put this down to a combination of the narrow (12 deg) spray cone angle of the 155715 injectors, and the reduced projection of the Y6DC plugs in comparison to the X5DTCs. If you look at Bosch's spark plug data, there's supposed to be no difference in projection between the two types, but putting the two side-by-side, there clearly is. Bosch sprk plug data HERE
Obviously, the jerky power delivery and fouled plugs are not good, so I went back the the injector data spreadsheet, to try to turn up an injector with a wider spray cone.
After a while I arrived at 0280156048, which has identical specifications to 0280155715, with the exceptions that it can take a retaining clip, it uses a USCAR connector plug, and it has a 15 degree spray cone as opposed to the 12 degree cove of the 155715 injector.
A quick search of e-bay turned up a flow-matched set from CS Performance injectors for $58 + shipping (cheap as chips !), and they arrived late last week. I fitted them on Saturday morning, and the way my car runs is once again looking promising. I'll run these for a while and let the forum know how things shape up in a few months.
Finally, in the course of all the above, I also found 0280155865 which is an identical specification to 0280156048, except that the flow is bifurcated into two streams - could be good for a multi-valve engine.... but later ! :)Leave a comment:
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A good reason not to use E36 M3 injectors in your E30 M3.
E36 M3 injectors are 0 280 150 701, and flow the same as the E30 M3 injectors (0 280 150 201) - 182.9g/min, and are indeed a straight swap - The later injectors can be used in the earlier car (but not the other way around), but the E36 M3 injectors will not vapourise the fuel like the 0 280 155 715 injectors I chose, and it's the quality of the fuel vapour that makes the difference.
Also, provided you're replacing low impedance injectors with high impedance injectors then a resistor pack will serve no other purpose than to raise the impedance further.
Best Regards,
Dave.Leave a comment:
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High impedance injectors can be used in a low impedance system, but not the other way around. Low impedance means the circuit has less resistance (more of a "dead short") and will burn up the injector drivers in a high impedance system (high impedance means less current draw from injectors).
Here's a good explanation...
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I've been servicing injectors here on r3vlimited for about 2-3 years and have always had this dilemma with using High Impedance injectors on a low impedance DME.
If that's no longer an issue, why not use the M3 E36 injectors 0280150440 rated 200cc at 3bar ?
I can sell those refurbished for 60$ a set and ship anywhere in the world for 25$Leave a comment:
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