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Deka 80s and TunerStudio

CAPT_BLOTTO

CAPT_BLOTTO

#Crush It
Joined
Jul 19, 2005
Location
Kansas City
I upgraded from volvo white injectors to a set of Deka 80s. I entered the data in the required fuel calculator and burned it. Car will sputter a bit but won't run anymore.

Does that setting scale the VE table? Are there other settings I need to change when upgrading injectors? Cranking/ WAE/Priming settings need to change? (These are known good injectors btw)
 
Your idle tuning is probably way off. These areas really sensitive to dead-time and voltage compensations. If you tuned with incorrect data before, it'll take a bit to get that ironed out. Once you're under load there shouldn't be any big changes as the dead-time is a much smaller percent of the overall injection time.

One huge bonus to using correct data: changing to other injectors with correct data should be a parameter change with near zero map tuning.
 
I think you shouldn't have to retune any of it, but it should at least fire up right? Unless something is way off.

My ms2 is set to .877ms deadtime and .107ms/v for my deka 80s. 2 squirts alternating and my required fuel says 4.60ms. (b230)
 
Is that a 60mm long boi? Should be pretty close.
This is the only other info I could find for the EV1 60mm 80lb injectors:
417168d1378713590-80-lb-hr-deka-injector-data-please-help-image.jpg

80 lb/hr Deka injector data, Please help - LS1TECH - Camaro and Firebird Forum Discussion

PCM Diagnostics & Tuning - 80 lb/hr Deka injector data, Please help - I am looking for the data I need to change my injector tables for the injectors I have. I have a data sheet but its in graph form. The injector part number is FI114991 80 lb/hr Deka IV Long USCar. Thanks
ls1tech.com
 
Its possible that because of the base injection multiplier that the table will need to be scaled up to inject appropriately. it would most likely start, even if it was over fueling like crazy. this tells me that you might need to scale the whole table up.
 
culberro said:
Is that a 60mm long boi? Should be pretty close.
This is the only other info I could find for the EV1 60mm 80lb injectors:
417168d1378713590-80-lb-hr-deka-injector-data-please-help-image.jpg

80 lb/hr Deka injector data, Please help - LS1TECH - Camaro and Firebird Forum Discussion

PCM Diagnostics & Tuning - 80 lb/hr Deka injector data, Please help - I am looking for the data I need to change my injector tables for the injectors I have. I have a data sheet but its in graph form. The injector part number is FI114991 80 lb/hr Deka IV Long USCar. Thanks
ls1tech.com
Click to expand...
So the dead time if I'm reading this right

1.3 - .7 ms = .6 ms dead time
 
CAPT_BLOTTO said:
So the dead time if I'm reading this right

1.3 - .7 ms = .6 ms dead time
Click to expand...
The posted opening and closing times don't have a voltage associated with them, and I'd assume it's 12v based on the offset table. The offset at 12v is 0.6124 ms, but MS doesn't use 12v, it uses 13.2v.

Let's fine the offset @13.2V..
Calculating the offset at a voltage between points 13v and 14v = (slope of offset from 13v to 14v) x 0.2v + offset at 13v
So offset at 13.2V = (-0.112) x 0.2 + 0.4889, which calculates out as 0.4665 milliseconds. This makes sense as a higher voltage should open the injector faster.
So total deadtime at 13.2V would be: 0.4665 ms
 
Your battery voltage correction would then be the absolute value of the offset slope... since MS subtracts that number from the commanded pulse width.
So set the battery voltage correction to "0.112" ms/V, but this is just between 13 and 14v

You can use 10v-14v as a bigger and more general range if you want. The correction would be:
(offset@10v - offset@14v)/4v => (0.8737 - 0.3779)/4v => 0.124ms/V
 
Last edited:
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