Distributor curve tuning on 22r/re??
12-26-2004 | 07:01 PM
#1
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From: So. Cal
Distributor curve tuning on 22r/re??
Has anyone tuned their distributor curve on their 22r/re yet? What kind of springs and/or weights did you have to use?
I've read that you either need to go to a lighter spring or heavier weights to tune the timing curve. TCR automotive suggests 12-14* of initial advance at 1000rpms. 20-22* of centrifugal at 2000rpms and the vacuum advance set at 4-6*.
The stock vacuum advance is really not adjustable unless you want less advance at idle (bad idea for fuel economy and part throttle performance ) by using a restrictor.
After a search on the 'net, I found that for best performance on N/A applications you should have at least 30* of centrifugal advance dialed in before 3000rpms.
Initial advance should be set at the highest setting just before detonation begins to occur. Running higher octane gas will typically enable more initial timing to be dialed in. I've already done this with great results. Of course, higher ambient temps and engine loads can affect this setting to some degree.
The problem I'm having is tuning the mechanical advance curve for best performance. Does anyone here know what works best on a 22r/re series motor?
I've read that you either need to go to a lighter spring or heavier weights to tune the timing curve. TCR automotive suggests 12-14* of initial advance at 1000rpms. 20-22* of centrifugal at 2000rpms and the vacuum advance set at 4-6*.
The stock vacuum advance is really not adjustable unless you want less advance at idle (bad idea for fuel economy and part throttle performance ) by using a restrictor.
After a search on the 'net, I found that for best performance on N/A applications you should have at least 30* of centrifugal advance dialed in before 3000rpms.
Initial advance should be set at the highest setting just before detonation begins to occur. Running higher octane gas will typically enable more initial timing to be dialed in. I've already done this with great results. Of course, higher ambient temps and engine loads can affect this setting to some degree.
The problem I'm having is tuning the mechanical advance curve for best performance. Does anyone here know what works best on a 22r/re series motor?
12-29-2004 | 03:11 AM
#4
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Joined: Jul 2003
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From: So. Cal
jimabena74,
With the 15* of advance you're running, are you also using higher octane fuel? I run between 10*-12* of initial BTDC, but I have to use 89 octane or it will ping under load in hot weather.
Have you done any mods to the advance springs and/or centrifugal weights inside the distributor yet?
I got some "14L" and "16L" centrifugal cam weights from an old 20r Celica. Most 22r's I've seen come with "10.5L" and "12.5L" cam weights inside the distributor. I'm thinking about using the 20r weights with the advance springs in mine to see if that'll tune the curve, but I don't know.
With the 15* of advance you're running, are you also using higher octane fuel? I run between 10*-12* of initial BTDC, but I have to use 89 octane or it will ping under load in hot weather.
Have you done any mods to the advance springs and/or centrifugal weights inside the distributor yet?
I got some "14L" and "16L" centrifugal cam weights from an old 20r Celica. Most 22r's I've seen come with "10.5L" and "12.5L" cam weights inside the distributor. I'm thinking about using the 20r weights with the advance springs in mine to see if that'll tune the curve, but I don't know.
12-29-2004 | 03:13 AM
#5
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Joined: Jan 2004
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From: Nor*Cal
my trucks stock.. i run 87 octane... i never notice any ping, however my truck sounds liek a diesel because i suck at adjusting my valves... so if it did ping, i probably wouldnt hear it... also my stereo is cranked all the way whenever i ride
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22r, advance, centrifugal, curve, distributor, distributors, engine, performance, ping, recurve, timing, toyota, tune, tuning, weights
