Re: Whitebird
Posted: 01 Oct 2014 07:00
I'd have never thought those baffles would be heard, that is odd but better than clacking CV's or worse. Julian I have timing instructions for you though I know you probably have them but here anyway. I use the Alternate Method and it works great.
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Timing and Idle Speed
Advancing the timing is synonymous with "free horsepower." This is the cheapest modification that you can do to an SR20DE engine. SR20DE engines come with the timing set from the factory anywhere between 10 to 15 degrees BTDC. If you advance the timing, then you will at the least gain crisp throttle response and at the most gain horsepower. But how much timing do you need to advance? In their July 1999 issue, SCC advanced the timing of their 1991 Sentra SE-R to 21 degrees and gained 6 hp. They claim that there was no detonation what so ever. Mike Kojima, however, believes that there is no horsepower to be gained beyond 19 degrees. As such, he suggests advancing the timing between 17 to 19 degrees and using 92-octane gas. I think Mike's advice is safer than SCC's 21 degree timing. Mike insists that you use 92-octane gas. So please do so. If you do not detonation might destroy your engine.
•
Here is the method as stated in the FSM:
1. Start engine and warm it up until engine coolant temperature indicator points to the middle of the gauge. Ensure engine speed stays below 1,000 rpm.
2. Run engine at about 2,000 rpm for about 2 minutes under no-load [this means turn off all accessories].
3. Rev engine two or three times under no-load, then run engine at idle speed for about 1 minute.
4. Turn off engine and disconnect the Throttle Position Sensor (TPS) The TPS is shown in the image to the left. It is the plug that is on top (brown). An SE-R mailing list member told me that only the 1998 and 99 models come with two plugs. I f you have a pre-1998 model you should only have one plug. That will be your TPS.
5. Start engine.
Rev engine (2,000-3,000 rpm) 2 or 3 times under no-load [This will lock the engine in timing mod]. Let engine run at idle speed
Alternate Timing Method:
This procedure is a lot simpler than the one listed in the FSM. Warm up the car to normal operating temperatures, disconnect the TPS while the car is still running, rev the engine three times to about 3,000 rpm to lock in the engine in timing mod, then adjust the timing. I like this procedure and I will use it in the future.
While the TPS is still disconnected, you can check your idle speed. The FSM recommends setting your base idle (with TPS disconnected) to 750 rpm. To adjust your base idle turn the idle speed adjusting screw to your left. After your done reconnect the TPS.
..................................................
Timing and Idle Speed
Advancing the timing is synonymous with "free horsepower." This is the cheapest modification that you can do to an SR20DE engine. SR20DE engines come with the timing set from the factory anywhere between 10 to 15 degrees BTDC. If you advance the timing, then you will at the least gain crisp throttle response and at the most gain horsepower. But how much timing do you need to advance? In their July 1999 issue, SCC advanced the timing of their 1991 Sentra SE-R to 21 degrees and gained 6 hp. They claim that there was no detonation what so ever. Mike Kojima, however, believes that there is no horsepower to be gained beyond 19 degrees. As such, he suggests advancing the timing between 17 to 19 degrees and using 92-octane gas. I think Mike's advice is safer than SCC's 21 degree timing. Mike insists that you use 92-octane gas. So please do so. If you do not detonation might destroy your engine.
•
Here is the method as stated in the FSM:
1. Start engine and warm it up until engine coolant temperature indicator points to the middle of the gauge. Ensure engine speed stays below 1,000 rpm.
2. Run engine at about 2,000 rpm for about 2 minutes under no-load [this means turn off all accessories].
3. Rev engine two or three times under no-load, then run engine at idle speed for about 1 minute.
4. Turn off engine and disconnect the Throttle Position Sensor (TPS) The TPS is shown in the image to the left. It is the plug that is on top (brown). An SE-R mailing list member told me that only the 1998 and 99 models come with two plugs. I f you have a pre-1998 model you should only have one plug. That will be your TPS.
5. Start engine.
Rev engine (2,000-3,000 rpm) 2 or 3 times under no-load [This will lock the engine in timing mod]. Let engine run at idle speed
Alternate Timing Method:
This procedure is a lot simpler than the one listed in the FSM. Warm up the car to normal operating temperatures, disconnect the TPS while the car is still running, rev the engine three times to about 3,000 rpm to lock in the engine in timing mod, then adjust the timing. I like this procedure and I will use it in the future.
While the TPS is still disconnected, you can check your idle speed. The FSM recommends setting your base idle (with TPS disconnected) to 750 rpm. To adjust your base idle turn the idle speed adjusting screw to your left. After your done reconnect the TPS.