upstate240sx

hey,
im wrapping up my sr20de+t swap, and im wondering whats the best way to install the distributor and set the timing, i tried this guide How To Set Crank Angle Sensor (CAS) Timing on the SR20DET Engine

ok, so heres what i did, i brought the motor up to tdc as shown in the picture, and to ensure i was on the right stroke (compression stroke) i made sure that the end of the cam, where the gear that runs the distributor that cam gear has a small bit missing from it from factory. so i put the motor at tdc on the right stroke and aligned the distributor rotor so that it would have cylinder 1 fire. then put everything back together and start it now i have a huge problem and i cant figure out why,i broke out the timing gun and im running at like 25-30 degrees btdc , i double checked my alignment of the distributor shaft and re did it again according to the guide and everything ive found online. and i run the same, i tried pulling the ecu and waiting to clear it , is there anyway i can reset the timing, mechanically im dead on , ive tried looking for a sr base tune guide but im not really getting it, i tried warming up the motor , and unplugging the tps with no luck , still same old 25-30 timing...

more updates,
ok so after half a day of 25-30 degree btdc timing, i tried this, i set the motor to tdc, and pulled the distributor and advanced the timing through turning the shaft that drives the rotor. i turned it to advanced the timing about 1 or 2 notches. so i did this and bolted it all up and started up and bam timing is at tdc so then i turned the distributor housing and set the timing to 15 degrees btdc. so now the engine revs fine, idle is kinda choppy , so i went to take it out for a drive and i have no power i checked boost leaks and cant find any , im running the oem smic setup . so i goto drive it and i have no power, i can rev it fine but when i let the clutch out and give it gas i go no where , like im not saying this to explain im going slow, but im really going like 3mph . so i throw the towel in and try this, turn the car off park it, and put in my n/a sr20de ecu ( i have a sr20de+t motor and i was using the jwt ecu above, and now im switching to my n/a sr20de ecu) so i put the ecu in the car try to start, and no start....

so heres what im thinking....

upon all the pluging and wiring and reving and such, at some point i set my jwt ecu with the wrong timing ( perhaps the tps wasnt attached and i revved some and set the timing) this would explain why with perfect mechanical timing im still running 30 btdc, and with the shaft turned a couple notches over i run at 15btdc. it wud also explain why a good ecu cant start the car at all, with the modified timing , so right now its too dark for me to see the timing marks on the crank so ill call it today.

but i left my jwt ecu unplugged, and tomorrow ill try to start the car with perfect mechanical timing on the n/a ecu, and swap in the jwt ecu and see what happens

upstate240sx

update with some stuff i tried, any ideas,

upstate240sx

more updates any idea people?

McCoy

I used the method listed in your link to stab my distributor in my DE. With the DE, are you getting the car into 'timing mode' before trying to adjust the timing?!? It's the same method as you would do to a sentra/NX/G20 since you are using a B13 JWT ECU.

Go over to the sr20forum and read up on how to set timing, it's well documented there.

upstate240sx

searched through sr20forum, this seems to be the most details how to, damn why the hell did my tach have to randomly stop working,
About Ignition Timing
HowTo: Advance Timing - G20.net - Forums

ive read through these a hundred times, there slightly diff, one you dont turn off the car after disconecting the tps the other you do.
any how with my mechanical timing set dead on, and using my jwt ecu , i cant turn the distributor far enough to reach 15 or even 20 btdc if i wanted to set the timing down there, hopefully leaving unplugged might have let it reset

also i dont have a b13 ecu, the conector is blue like the 240 ecu as opposed to white, i have a jwt ecu programed for a sr20det with 370s with a distributor and a single cam ka maf but i dont think that should make a difference

also here another for ya, my tach is acting up i have a 91 240sx, so the tach is made for dohc, when i first dropped the motor and turned the engine over the tach needle jumped around , in sync with the motor turning over... so a week later i got some loose end wrapped up. but now engine though the engine runs, no tach, my coolant gauge works, clock works, havent had a chance to try the speedo, fuel gauge works... could i have blown something related to the tac?

McCoy

The tach isn't that important, just rev the thing 3 times after the car is warmed up and check to see if your timing, if its not jumping around and close to 15 degrees then you know you got it in timing mode

I usually just pull the TPS as it's running, but it really doesn't matter, it will work either way if done right.

Umm, the JWT B13 ECU, Calum B13 ecu, and KA NA ECU of mine all have blue plugs...

upstate240sx

will it make much of a difference if i dont have a o2 sensor, and should i reset mechanical timing dead on again, before i try setting the timing

McCoy

o2 sensor doesnt matter. set the distributor to where it's in the middle of the adjustment range... this should be pretty dang close to 15 degrees from how mine is set.

upstate240sx

i must be fuckin somethin up...also i figured out why my tach wudnt work, that jwt ecu i have is for 89-90 240sx with a sr20det, single cam cluster setup ii guess. ill try the jwt again ecu tomorrow, i threw in the stock sr20de ecu and set mechanical timing dead on and the car runs alot better, prob not perfect , too rich but rich is better then lean i guess. i melted a coolant blockoff today driving around, (note to self: never use that shitty clear line from loews for coolant blockoff lol) ,