gtir swap and the crank angle sensor

For discussion of front-drive SR20DE, SR20VE and SR20DET engines!
Spooled_GTIRSENTRA
Posts: 37
Joined: Sun Sep 24, 2006 8:06 am
Car: 04 Sentra Spec V, 93 sentra with GTI-R (sr20det) swap

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i was wondering whats gonna happen, with this swap you have to change the flywheel and doesnt the crank angle sensor read the number of teeth on the flywheel? im guessing that the number of teeth are different because its like 2 inches smaller in diameter then the stock gtir flywheel. is this gonna mess anthing up? if it does what can i do? could i swap the CAS from the sr20de model or wouldnt that fix anything?

thanks


Chris859
Posts: 407
Joined: Mon Aug 07, 2006 10:09 pm
Location: Pinetop, Az

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Well, you need to use a usdm se-r transmission, and flywheel/clutch to make the swap fit. So, I don't know why you are worrying about the gtir flywheel. A fwd sr20de flywheel will bolt right up IF you take it to a machine shop and have the bolt holes drilled out to 11mm (gtir has 11mm flywheel bolts, other sr20's are 10mm...).

Spooled_GTIRSENTRA
Posts: 37
Joined: Sun Sep 24, 2006 8:06 am
Car: 04 Sentra Spec V, 93 sentra with GTI-R (sr20det) swap

Post

its not the flywheel im worryin bout, i have the ser flywheel on but if the crank angle sensor doesnt read the amount of teeth that is on the gtir flywheel it either wont start or it will make the ecu think that flywheel is messed up. and may put it into limp mode... and what ive herd from a guy that this is why my car isnt starting.... but i just wanted to see if this is true and what can i do about it?

Chris859
Posts: 407
Joined: Mon Aug 07, 2006 10:09 pm
Location: Pinetop, Az

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are you trying to use the gtir ecu? The best way to do the swap, is use your se-r harness, and a tuned se-r ecu. But with some work you can use the gtir harness/ecu assembly. I'm assuming you are using the gtir maf as well(if not, thats likely part of your problem)?

B13 sr20's don't have(or rather aren't supposed to have) a crank position sensor - the one that reads off the flywheel ring gear. The transmission bellhousing on a b13 doesn't even have a hole for one to mount. B14's have them, as part of the obd system... And they will run fine without one hooked up, it will just throw a code and turn on the check engine light. Even if your car were in "limp mode" It would still start, and run - just wouldn't rev above 2500rpm.

Now, if you are talking about the actual crank angle sensor(has nothing to do with the flywheel), then yes - that needs to be hooked up properly(located in the distributor), as that is what the ecu times all spark, and fueling events off of.

Have you checked all of the obvious things yet? All wiring connections, including the ecu plug tight? All grounds good? Have you checked to see why it isn't starting - Do you have fuel, and spark?

Spooled_GTIRSENTRA
Posts: 37
Joined: Sun Sep 24, 2006 8:06 am
Car: 04 Sentra Spec V, 93 sentra with GTI-R (sr20det) swap

Post

i have power to the coil but i still dont get spark. i just put a new coil in there a day ago because i thought that would be the problem. but still nothing so i tried putting a spark plug wire to the coil and grounding it but still nothing. when the key is on the coil is getting about 2-3volts. how much volts shoud it get? everthing else is good, im getting gas and its cranking over but still wont get spark.. could the resistor and condencer be going out or somthing? thats the only thing i could think of. i could try new plug wires too but even if the ones i have now were crap i should still get a little spark.... oh and what should the gap on the spark plugs be? i never checked the gap on any of them. and that could be another problem.. and no im not using the gtir MAS i was trying to use the ser one. and trying to use my gtir ecu.. let me know what you think! im right about to sell this car thanks

Chris859
Posts: 407
Joined: Mon Aug 07, 2006 10:09 pm
Location: Pinetop, Az

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Your coil voltage is most likely the culprit for not having spark... With the key "on" you should be getting battery voltage on the positive side - aka 12-13 volts, not 2-3! At 2-3 volts you may as well have the coil disconnected, as that is nowhere near what is needed for it to work correctly. On the plug gaps, .035-.045(but all the same gap) will work fine. Are you using the gtir harness, or the se-r harness? Regardless, the lack of spark is the reason it won't start, and im willing to bet the lack of power to the coil is why it won't spark.

Spooled_GTIRSENTRA
Posts: 37
Joined: Sun Sep 24, 2006 8:06 am
Car: 04 Sentra Spec V, 93 sentra with GTI-R (sr20det) swap

Post

today i found one of my problems, there is a harness clip that wasnt plugged in and was getting the exact amount of power that the coil was getting.. there is nothing left to clip it too and i couldnt figure it out. so today i went out on a limb and tried putting one of the wires to the battery. i did it and my fuel pump clicked on and started.. i have never herd it click on b4, i just figured that the engine was getting gas becuase my spark plugs smelled like gas.. but mabe it was left over gas in the pistons, so after i made taht discovery i didnt try to start it but that is a wire that powers everything! red/blk everything that gets power has this color wire.. so ill let you know what happens im going to work on my car in a few

thanks for all your helpTony


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