im in the process of trying to get my fiero to work with a haltech ecu
so far i feel like im decently close but i have run into a road block in my search
for the ecu to calculate rpm it needs a trigger
this trigger comes from a crank position sensor
now the crank position sensor that the 60 degree v6s use is a 7x signal basically every rotation there are 7 groves that the sensor picks up ( 6 equally spaced grooves with 1 groove 10 degrees before the 6th groove)
example of 7x crankshaft sensor layout)
there are a few types of setups i can run to get a good crank signal but the one i was informed of currently is the missing tooth signal which requires the following
a signal that can be equally divided by the number of cylinders (side note the more grooves or teeth present the more accurate the ecu can be from what i was informed of)
a place where i can delete a tooth/groove so the haltech knows when a full revolution has been made
again this is currently the only way i have been informed of any imput is greatly appreciated
i have two ideas to get this to work
first idea is to take a crankshaft that fits my engine and to put grooves every 10 degrees (instead of 6 equally spaced grooves plus the 10 degree 7th one) then close to the tdc location of the crankshaft i would not put a groove that would give me my equally spaced grooves and my missing groove
my question with this is whether or not i can make these grooves into the crankshaft and be able to achieve neutral balance again (they would not be alot of material maybe 1/16 inch into the crank maybe 1/8 inch wide) (this process would definitely have a professional cnc machine make the cuts and grooves then the crank would be balanced at a shop)
also could this reduce the structure of the crankshaft
to me this idea is the one i prefer as it makes the engine look stock still and normal from the exterior
my second idea is to add an exterior crank position sensor and ring
this ring would be cnc cut and bolted to the harmonic balancer and a bracket would be made to hold the crank postion sensor
i know this idea has been done before but i would still like to see if idea number one is ok as they probably (maybe) will cost roughly the same in the end as both will require a relatively accurate pickup ring and both also require the cnc machine work
an additional question on top of the already large amount of questions
will the 7x acdelco sensor be able to pick up these modified signals or will i need a new sensor with these setups
please any tips info or anything is greatly appreciated iv come here for assistance any little amount is helpful i have a few other questions to that dont necsarrily pertain to this posts title
which crank shafts will fit the 2.8 liter v6 block
performance between the 2.8 3.1 3.4
block differences between 2.8 3.1 3.4 3100 3400 3500 3900
is there any crank compatibility between those engines
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1986 fiero se 2.8 v6 4 speed