Bosch 290155737 white 36pph
#2
Re: Bosch 290155737 white 36pph
http://www.hptuners.com/forum/showth...6lb-0280155737
Just to close this one off in case others run across the same question. I have confirmed from a couple of different sources that all three part numbers - 0280155868, 0280155811, & 0280155737 are all the same injector. The reason for the different p/n's was actually different material and color of the o-rings (o-ring size is still the same across all 3).
'm curious for those of you that are using these injectors what your final high/low slope and breakpoint has turned out to be. I've played around a lot and it seems that I've settled on High Slope = 36.5008 and Low Slope = 47.2504 (lbs/hr) with a breakpoint of 3.65 x 10e-5 lb/rev. Because the spec sheet is in mass vs. rev, my understanding is that you need to multiple the spec sheet breakpoint x 4 and move the decimal places. I think this came from a decipha post.
Just to close this one off in case others run across the same question. I have confirmed from a couple of different sources that all three part numbers - 0280155868, 0280155811, & 0280155737 are all the same injector. The reason for the different p/n's was actually different material and color of the o-rings (o-ring size is still the same across all 3).
'm curious for those of you that are using these injectors what your final high/low slope and breakpoint has turned out to be. I've played around a lot and it seems that I've settled on High Slope = 36.5008 and Low Slope = 47.2504 (lbs/hr) with a breakpoint of 3.65 x 10e-5 lb/rev. Because the spec sheet is in mass vs. rev, my understanding is that you need to multiple the spec sheet breakpoint x 4 and move the decimal places. I think this came from a decipha post.
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Re: Bosch 290155737 white 36pph
The data sheets of the LU34 and 280-255-868 injectors is the same. With that said here is the data:
Injector Data Sheet: 280-155-868 : LU34, 34 #/hr Skinny
Fuel Pressure: 44
Flow rate: 35.5 #/hr
Minimum PW @ 44 psi: 729 usec
Offset Compensation versus Battery Voltage:
6.4 Volts: 3105 usec
8.0 Volts: 2046 usec
9.6 Volts: 1521 usec
11.2 Volts: 1204 usec
12.8 Volts: 970 usec
14.4 Volts: 785 usec
15.0 Volts: 752 usec *extrapolate to 16 V
Just zero this table:
Short PW Compensation versus Pulse Width:
0.015 msec: -192 usec
0.244 msec: -152 usec
0.488 msec: -109 usec
0.732 msec: -67 usec
0.976 msec: -24 usec
1.220 msec: 0 usec
1.460 msec: 0 usec
1.708 msec: 0 usec
1.950 msec: 0 usec
2.197 msec: 0 usec
2.440 msec: 0 usec
2.685 msec: 0 usec
2.929 msec: 0 usec
3.170 msec: 0 usec
3.410 msec: 0 usec
3.660 msec: 0 usec
3.900 msec: 0 usec
RBob.
Injector Data Sheet: 280-155-868 : LU34, 34 #/hr Skinny
Fuel Pressure: 44
Flow rate: 35.5 #/hr
Minimum PW @ 44 psi: 729 usec
Offset Compensation versus Battery Voltage:
6.4 Volts: 3105 usec
8.0 Volts: 2046 usec
9.6 Volts: 1521 usec
11.2 Volts: 1204 usec
12.8 Volts: 970 usec
14.4 Volts: 785 usec
15.0 Volts: 752 usec *extrapolate to 16 V
Just zero this table:
Short PW Compensation versus Pulse Width:
0.015 msec: -192 usec
0.244 msec: -152 usec
0.488 msec: -109 usec
0.732 msec: -67 usec
0.976 msec: -24 usec
1.220 msec: 0 usec
1.460 msec: 0 usec
1.708 msec: 0 usec
1.950 msec: 0 usec
2.197 msec: 0 usec
2.440 msec: 0 usec
2.685 msec: 0 usec
2.929 msec: 0 usec
3.170 msec: 0 usec
3.410 msec: 0 usec
3.660 msec: 0 usec
3.900 msec: 0 usec
RBob.
Last edited by RBob; 10-02-2014 at 07:04 AM. Reason: changed min PW for 44 psi (from 39.15)
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Re: Bosch 290155737 white 36pph
Most if not all of the data comes from Ford Motorsport. It is on their web site for the injectors that they sell. Part of the issue is that they list it with their part number, hence titles such as M-9593-AA302, M-9593-LU34, and so on.
Apparently some have crossed these to Bosch part numbers and re-titled the data sheets.
Note that in my post I changed the Minimum PW for use at 44 psi, it was listed for the 39.15 psi.
RBob.
Apparently some have crossed these to Bosch part numbers and re-titled the data sheets.
Note that in my post I changed the Minimum PW for use at 44 psi, it was listed for the 39.15 psi.
RBob.
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Re: Bosch 290155737 white 36pph
http://www.hptuners.com/forum/showth...6lb-0280155737
Just to close this one off in case others run across the same question. I have confirmed from a couple of different sources that all three part numbers - 0280155868, 0280155811, & 0280155737 are all the same injector. The reason for the different p/n's was actually different material and color of the o-rings (o-ring size is still the same across all 3).
'm curious for those of you that are using these injectors what your final high/low slope and breakpoint has turned out to be. I've played around a lot and it seems that I've settled on High Slope = 36.5008 and Low Slope = 47.2504 (lbs/hr) with a breakpoint of 3.65 x 10e-5 lb/rev. Because the spec sheet is in mass vs. rev, my understanding is that you need to multiple the spec sheet breakpoint x 4 and move the decimal places. I think this came from a decipha post.
Just to close this one off in case others run across the same question. I have confirmed from a couple of different sources that all three part numbers - 0280155868, 0280155811, & 0280155737 are all the same injector. The reason for the different p/n's was actually different material and color of the o-rings (o-ring size is still the same across all 3).
'm curious for those of you that are using these injectors what your final high/low slope and breakpoint has turned out to be. I've played around a lot and it seems that I've settled on High Slope = 36.5008 and Low Slope = 47.2504 (lbs/hr) with a breakpoint of 3.65 x 10e-5 lb/rev. Because the spec sheet is in mass vs. rev, my understanding is that you need to multiple the spec sheet breakpoint x 4 and move the decimal places. I think this came from a decipha post.
In regard to the second paragraph about the slope- well it's way above my pay grade. I'm so old school I have a difficult time with some of this.
Sooo, my tuning is based on SOTP and things like what SA/AFR nets the lowest TP/highest vacuum at cruise, mid throttle etc.
FWIW My base bin is the APYP 'Vette manual trans bin and I'm currently running in open loop. I used the offsets Bob supplied and my tune was very rich. I have tried a couple of different routes so far.
First, I leaned it out with the MAF tables. The problem I was having was it would be great at most points but off in others. (may be unique to MAF)
Second, I lowered the batt offset in the same "proportion" as Bob's slope while leaving the MAF tables alone (except for a little tweek at idle). It seems to be "closer" to the "target" AFR commanded by the ECM.
This is where I ended up.
IC = 34.5
IO vs low PW = 0
IO vs Batt
11.2 = 823.97
12.8 = 732.42
14.4 = 671.39
I haven't gone outside those voltages yet since they aren't normally encountered. I'm sure I will at some point.
I only offer this to let you know what I have done and seems to be working. However, refer to statement #2 in that I may not be understanding something properly. It seems the Bosch injectors are a bit more "stable" in the lower pulse widths in that the slope is flatter than the OEM injectors. Am I making a mistake by going this route or am I on to something? My rational is that if the actual AFR is closer to the "target" AFR it will help if I want to transition back into closed loop sometime.
Last edited by antman89iroc; 10-02-2014 at 07:36 AM.
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Re: Bosch 290155737 white 36pph
I can't say regarding the 1/2PSI fuel pressure change, I think it would be very small and may not be warranted.
Now in regard to the ACTUAL flow rate at the pressure used I have also found conflicting information. Bosch shows 34.5pph @ 43.5PSI. I have seen 35.5 and you probably know they are commonly referred to as 36's. I use 34.5 currently in my bin but have used 35.5 as well. Since it can be used as a tuning aid I suppose it is up to the tuner. One would have to flow the set in question to know what is absolutly true.
Here in lies one of my delimas. What is true and correct? Since all of these settings can be used to tune it is difficult for me to know what is best. I try to rely on what works 99% of the time. But I am not an expert and rely heavily on Bob and many others for "tips". I can tell you that changing the batt offsets had a more profound effect on rich/lean than changing the IC by 1lb.
I will digest the charts you posted later.
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Re: Bosch 290155737 white 36pph
I am reconsidering some of what I posted regarding offsets.
I looked closely at the charts posted and just read this "letter" regarding offsets.
http://injectordynamics.com/articles...racterization/
I suppose what I am doing is questioning Bob's information. (Sorry Bob) the injector offsets "are what they are" as a part of their operational characteristic and probably shouldn't be changed. Yes Bob, you told me that but I guess I had to learn for myself. Dang it! My car is running soooo good with my wrong offsets lol. In my defence I did admit that I didn't fully understand this. At least I was right about that!
I looked closely at the charts posted and just read this "letter" regarding offsets.
http://injectordynamics.com/articles...racterization/
I suppose what I am doing is questioning Bob's information. (Sorry Bob) the injector offsets "are what they are" as a part of their operational characteristic and probably shouldn't be changed. Yes Bob, you told me that but I guess I had to learn for myself. Dang it! My car is running soooo good with my wrong offsets lol. In my defence I did admit that I didn't fully understand this. At least I was right about that!
Last edited by antman89iroc; 10-06-2014 at 03:24 PM.
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Re: Bosch 290155737 white 36pph
I am reconsidering some of what I posted regarding offsets.
I looked closely at the charts posted and just read this "letter" regarding offsets.
http://injectordynamics.com/articles...racterization/
I suppose what I am doing is questioning Bob's information. (Sorry Bob) the injector offsets "are what they are" as a part of their operational characteristic and probably shouldn't be changed. Yes Bob, you told me that but I guess I had to learn for myself. Dang it! My car is running soooo good with my wrong offsets lol. In my defence I did admit that I didn't fully understand this. At least I was right about that!
I looked closely at the charts posted and just read this "letter" regarding offsets.
http://injectordynamics.com/articles...racterization/
I suppose what I am doing is questioning Bob's information. (Sorry Bob) the injector offsets "are what they are" as a part of their operational characteristic and probably shouldn't be changed. Yes Bob, you told me that but I guess I had to learn for myself. Dang it! My car is running soooo good with my wrong offsets lol. In my defence I did admit that I didn't fully understand this. At least I was right about that!
Last edited by antman89iroc; 10-06-2014 at 03:36 PM.
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Re: Bosch 290155737 white 36pph
I invested in a Honeywell fuel pressure transducer- Rbob insists they are worth it and I would have to bow to his experiance.
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Re: Bosch 290155737 white 36pph
A search returned a plethora of options.
Last edited by antman89iroc; 10-07-2014 at 07:11 AM.
#17
Re: Bosch 290155737 white 36pph
Honeywell MLH100PGB06A
Rbob says its more reliable than Autometer (which I also have on another vehicle. Not cheap for any, Holley also offers a version. Lots of cheap ones out there- I picked it for industrial grade instrumentation.
Logs pressure only.
Several OE applications out there- you need a 0-5v reference.
Rbob says its more reliable than Autometer (which I also have on another vehicle. Not cheap for any, Holley also offers a version. Lots of cheap ones out there- I picked it for industrial grade instrumentation.
Logs pressure only.
Several OE applications out there- you need a 0-5v reference.
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