Fast 36 Lb injector 280-155-868

[warlock007]

I have been doing searches and find so many variations to the B3701,02,03 and B4001,02,03,04 that i dont believe or trust which one is right.

I have a 2000 vet but im running the 2002 (156) OS in it.

I am asking for someone who has these to send me a copy off all above numbers. I am not a math wiz (joecar) blows my mind with the calculations:))

i found the .xls that was posted by REDHARDSUPRA which is great but then those numbers are different than ones posted by another, sorry not on my other computer to get the web address.

thanks in advance, using V2

[joecar]

Hi Mike, I don't have those other tables for those injectors.

[warlock007]

Hi joe, I'm hoping someone does??

What is best way to lean out STFT with out touching O2 switch points? I had to set bank1 25 less than B2 for them to be really close. Numbers at idle are ok but around -1/-6 and at 2000 -4/-10

[mr.prick]

BOSCH Fuel Injectors 0280155868 (http://forum.efilive.com/showthread.php?12195-BOSCH-Fuel-Injectors-0280155868&highlight=bosch+38)

script in post #17 ;)

[warlock007]

Thank you mr. P!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[warlock007]

15978


Ok, I installed today with all the numbers provided. seems to be pretty good,However I am getting a high STFT lean condition (7-20) i do not have any leaks. I added 10% to the maf tables in order to bring it down. Is this normal?

This is my current tune.

[bimbleuk]

Do a few CALC.VET or CALC.MAF runs to calibrate the MAF/VE and then see what your trims are doing?

[warlock007]

Ill do some more, my initial one up through 7100 MAFREQ was spot on at 1.00 and the VE looked pretty good.

Is it normal to have to add to the MAF table?

[joecar]

Mike, did you get 12212156.cax to work (don't place it in LS1B, but rather place it in Calibrations which is the parent folder of LS1B).

[warlock007]

I did but we need to talk so that you can clean the .cax file up

Mike

[joecar]

ok.

[joecar]

15978


Ok, I installed today with all the numbers provided. seems to be pretty good,However I am getting a high STFT lean condition (7-20) i do not have any leaks. I added 10% to the maf tables in order to bring it down. Is this normal?

This is my current tune.Hi Mike,

I'm still checking the IFR math in your tune file, sorry I got slowed down (had to take pet back to vet emergency).

[joecar]

Hi Mike,

These are my calculations:

injectors rated flowrate: 36 lb/hr @ 43.5 psi

scale for 58 psi rail pressure (what you measured): 36 * sqrt(58/43.5) = 41.6 lb/hr

convert to grams per second: 41.6 * 0.1259 = 5.24 g/s

calculate each cell of IFR table B4001:
IFR(P) = 5.24 * sqrt((400+P)/400) : where P is in kPa, IFR is in g/s

calculating each cell g/s (rounding to 2 decimal digits):
IFR(0) = 5.24
IFR(5) = 5.27
IFR(10) = 5.31
IFR(15) = 5.34
IFR(20) = 5.37
IFR(25) = 5.40
IFR(30) = 5.43
IFR(35) = 5.46
IFR(40) = 5.50
IFR(45) = 5.53
IFR(50) = 5.56
IFR(55) = 5.59
IFR(60) = 5.62
IFR(65) = 5.65
IFR(70) = 5.68
IFR(75) = 5.71
IFR(80) = 5.74


The spreadsheet gives me the same numbers.

[joecar]

Mike,

Your IFR table has slightly different values:

LABELS Injector Flow Rate (Grams/Second)
Manifold Vacuum kPa {link: GM.MANVAC} Value
0 5.054688
5 5.085938
10 5.117188
15 5.148438
20 5.179688
25 5.210938
30 5.242188
35 5.273438
40 5.296875
45 5.328125
50 5.359375
55 5.390625
60 5.421875
65 5.445313
70 5.476563
75 5.507813
80 5.539063


You table is 4% lower than the spreadsheet calcs.

[bimbleuk]

I've done through a similar process to find values for my 811 injectors which I believe are similar to those used in the ASA Corvette's.

811's are described as 36 lb injectors on the net but the Bosch figures appear to rate them at 34.3 lbs/hr and I've measured mine at 33.7 lbs/hr (354cc) which matches what an injector suppler also tested them at.

With regards to the 868's Bosch appear to rate them at 34.5 lbs/hr and personally I wouldn't be totally happy unless I got one flow tested. That's also ~4% less than 36 lbs/hr which is possibly where the current IFR table values come from?

[warlock007]

Thanks Joe,

Bimbleuk, Fast(Bosch) injectors are rated at 43.5psi/3 bar/378cc and were flow tested with-in 1% of each other, which is better than the normal 5% allowance given by most, as Corvettes run at 58psi it turns them into 4 bar and Joe is right with the numbers, I was looking at previous calculations which were showing in post 14. Not only do these numbers mean a lot but trying to get the correct Offset numbers is also very important and seems to be difficult to get. I have called Fast 3 times, 2 times was told they would email me the sheet which they didn't do, the third was told they don't have that information.

Mr. Prick has a post with the numbers and his sheet also shows post 14 numbers not post 13 numbers (B4001) and that is what caused me to check further into this. I am trying to verify the offset numbers as the voltage is also critical since it can be to hot/cold of a spark provided.

now that this is getting closer I can start to try and figure out why my MAF/VE table every time i run the car is different. I am also trying to dial in my STFT as it is inconsistent (trying to stabilize it) in different area's of the chart. My LTFT is with in 4% now of each other but always Bank 1 leaner than Bank 2, which drives me nuts.

The big one is the WB numbers, they move to much, my stoch is set 14.22, V2 set to same and my LM-2 as well. EQ is .885 max rich, 1.03 Cold loop, I understand it will change some as its always trying to maintain stoch, but it shouldn't that much.

Joe, when you can give me a call, sorry to hear the kitty still having issues.

[warlock007]

Heres a new issue, no matter how many times I update the IFR table to what i want and save it, after i close and reopen it always adds to the table.

[bimbleuk]

That's half the battle if you've had them flow tested. Luckily I have access to an injector rig and my 811's also tested within 1cc of each other. I've also got a slight imbalance on the LTFT's but my headers aren't the same each side for example and they came with the donor engine so have a few miles on them so I'm going to live with a percent or two.

[mr.prick]

are the units diplayed the same as the scripts?

the software will change the numbers.
something to do with 1s & 0s :hihi:

[joecar]

In the 4th or more decimal place, the software will round to nearest decimal place to to quantization error due to binary representation of a real number.

[joecar]

...

Joe, when you can give me a call, sorry to hear the kitty still having issues.Mike, I call you sometime on Monday.