vvt18
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« on: April 29, 2020, 10:23:11 AM »
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Hi all. Somebody can help me with an information PLEASE!
i want to buy this injectors 0280158235
They are specified in some places as 714cc and in other stores as 500g/min n-heptane
It is the same thing 500g/min with 714cc?
I found some convertors on internet and there they said 1g.min = 1cc. So i'm very desoriented. Many thanks in advance!
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nyet
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« Reply #1 on: April 29, 2020, 10:31:41 AM »
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« Last Edit: April 29, 2020, 10:33:32 AM by nyet »
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vvt18
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« Reply #2 on: April 29, 2020, 10:40:45 AM »
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Thanks Nyet. I made a conversion and i think i made ok after internet conversions
1lb/hr =10.499cc
1lb/hr = 7.55987g/min
7.56g/min is aproximatly 10.50cc/min
so
500g/min si aproximatly after my calculation 695cc
After WIKI
1 cc/min = 0.685 g/min
714cc = 489g/min
All online stores put 714cc as description
My calculation is wrong or they put as description a fake value.
Thanks again in advance!
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« Last Edit: April 29, 2020, 10:43:52 AM by alin1 »
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nyet
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« Reply #3 on: April 29, 2020, 10:42:52 AM »
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No problem, i should really add the 0280-158-235 to that page.
I dont have a reliable datasheet for it though.
I didn't double check your calcs but they seem reasonable
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vvt18
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« Reply #4 on: April 29, 2020, 10:48:55 AM »
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I'll make an order and hope they will be fine.
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vvt18
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« Reply #5 on: May 06, 2020, 04:58:46 AM »
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Hi.
I put the new injectors and drive 2 days with old
tvub
1.5760 1.1040 0.9413 0.8373 0.7600
and
krkte = 0.060
Car starts ok , running ok
ltft after 30 km goes from -0.8 to -7.6
I adjust today the krkte to 0.044 after nyet formula.
Please tell me the temin and teminva for 730cc must be 0.71 or 0.60?
With 550cc i was running with 0.30 temin and temin va but i read the bosch injector migration topic and i saw there you said 0.6 will be good
I found in the same topic a table with 750cc bosh calibration. I think i can use for my 731cc the same values as 750 decreased very very few.
i will try
tvub
1.6987 1.2000 0.9307 0.7307 0.6693
for bigger injectors tvub values must be higher than a small injectors?
thanks in advance
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« Last Edit: May 06, 2020, 08:37:41 AM by alin1 »
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vvt18
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« Reply #6 on: May 06, 2020, 11:21:21 AM »
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tested new setup for my new 731cc at 3 bar
old setup from 550cc 3 bar tested on these 731 - start ok running ok ltft -8 , too much fuel on engine brake (rev)
krkte =0.60
temin and teminva 0.3
tvub 1.5760 1.1040 0.9413 0.8373 0.7600
new setup used table from topic "bosch injector migration" little decreased : "START is very bad , after no difference
krkte =0.445
temin and teminva 0.5
tvub 1.6987 1.2000 0.9307 0.7307 0.6693
i think i must have higher TVUB values for 731xx than 550cc, so the bosh table is bad
any advices please
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« Last Edit: May 06, 2020, 11:28:35 AM by alin1 »
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nyet
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« Reply #7 on: May 06, 2020, 12:55:26 PM »
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cold start vs warm start is wall wetting, not TVUB, not temin
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vvt18
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« Reply #8 on: May 06, 2020, 01:08:02 PM »
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Thanks Nyet.
What temin is accurete for 731cc, i don't find any specification for them.
I wrote to BOSCH and they told me they not have specifications. VERY NICE!
With old injectors 550cc i had 95% duty and with these new 731cc have 80% duty at 1.5 bar but with my maf at the limit.
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