2nd Generation Specific 1986-1992 Discussion

Timing

Old 06-18-2004, 08:10 PM
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Just wondering how accurate the timing pointer is on the front cover of a S5 n/a. The reason I ask is that when I time my car correctly, I get bucking under light acceleration and a wierd sounding idle. If I advance the timing about a eighth to a quarter of an inch, this problem goes away and my car behaves much better, but I am worried about pinging the engine. Just wondering if there is any way to check this.

Thanks!
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Old 06-18-2004, 08:32 PM
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the pointers are accurate, someone may have at one time

put the crank angle sensor in a tiny bit off, or it could

be something else causing the bucking



just leave it where it runs right
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Old 06-19-2004, 01:19 AM
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The pulley can be off by 1 deg, there is play in the bolts that hold it together. The cas can be off by 3 degs. A little advance on an n/a is ok.
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Old 06-19-2004, 12:50 PM
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cool.. I guess as long as it doesn't ping, it is ok. Is there any gains from advancing the timing on an n/a?? If so, how far can you go? Thanks for the help guys!!
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Old 06-19-2004, 12:57 PM
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yes you do gain from advancing the timing on an na. generally you can keep going until you loose power or start to ping
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Old 06-20-2004, 12:22 AM
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good luck getting your car to ping with an all stock fuel system , i can run mine almost full lean on the rich lean adjustment and my timing almost all the way advanced, i can get it to hesitate top end but not to ping.
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Old 06-20-2004, 12:53 AM
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sounds like a miss adjusted tps
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Old 06-20-2004, 10:55 AM
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Originally Posted by DriftSeshRx7' date='Jun 19 2004, 09:22 PM
good luck getting your car to ping with an all stock fuel system , i can run mine almost full lean on the rich lean adjustment and my timing almost all the way advanced, i can get it to hesitate top end but not to ping.
that rich lean adjuster only adjusts idle, when the tps moves from 0 that thing doesnt work anymore
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Old 06-21-2004, 11:51 AM
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Ok, so this might be a dumb question, but if I advance it until it pings, won't I break an apex?? The TPS was off a little, but by advancing the timing over stock, lets say about 1/4" (3-5 degrees??) the hesitation goes away and the car doesnt buck at all. Something else that is wierd, I am getting about 28-30 mpg on a large SP with headers and an intake on a 91 engine. AND it is fast.. go figure
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Old 06-21-2004, 12:03 PM
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Originally Posted by threcixty' date='Jun 21 2004, 08:51 AM
Ok, so this might be a dumb question, but if I advance it until it pings, won't I break an apex?? The TPS was off a little, but by advancing the timing over stock, lets say about 1/4" (3-5 degrees??) the hesitation goes away and the car doesnt buck at all. Something else that is wierd, I am getting about 28-30 mpg on a large SP with headers and an intake on a 91 engine. AND it is fast.. go figure
the sp is prolly causing the bucking, s5 efi doesnt like mods



pinging on an na wont break the seals right away
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