Hey everybody. I recently put some s3's in my 91 se-r, and since then everyone's been telling me that i forgot to do this, and forgot to do that. This is weird because i've never heard of anyone performing these tips when putting s3's in (maybe some people do this stuff i've just never heard of it). Well the mechanics that i'm getting tips from i guess build engines, and they say that whenever you put cams in you have to center-line them for best performance, and they say few people know that you have to do this. What the hell's a center-line? They also say i have to get bigger fuel injectors. The last thing they say is that when I set my timing to 15 degree's it doesnt matter because the computer will just set it back to what it feels comfortable at. I searched about s3 installs and didnt find anything about this. So my questions are:
1. Do i have to centerline my cams? Will i get better performance from it? Where could i buy the tool if i have to?
2. Would bigger injectors help at all? Fuel pump + injectors?
3. Does the computer really play these timing tricks on me? With s3's and no ECU i thought it was just 15 degrees and 89 octane.

Thanks for any help

Steve

Originally posted by freak4

1. Do i have to centerline my cams? Will i get better performance from it? Where could i buy the tool if i have to?
2. Would bigger injectors help at all? Fuel pump + injectors?
3. Does the computer really play these timing tricks on me? With s3's and no ECU i thought it was just 15 degrees and 89 octane.

Thanks for any help

Steve

1. I think they mean adjust the cam timing with some cam gears, which you don't need to do. If they mean something else, just ignore them.
2. No
3. Use 91+ octane with the cams. This might not be absolutely necessary, but I would do it (I did do it). 13-15 degrees is supposed to be best on a stock ecu (some people have reported good results with higher timing, you can search and figure out what you want to do. Try the se-r.net archives also). The computer does change the timing from the base timing while the car is running, but you want to set the base timing, and it sounds like you already did that.

Take it easy on new cams for a while. Then have fun :D

Originally posted by freak4
They also say i have to get bigger fuel injectors. The last thing they say is that when I set my timing to 15 degree's it doesnt matter because the computer will just set it back to what it feels comfortable at. I searched about s3 installs and didnt find anything about this. So my questions are:



Sounds like they are domestic owners.

The ECU does adjust the timing at will, though. You can check this by adjusting your timing with the TPS disconnected, then re-connecting it and checking the timing again. But it can still be adjusted.

Yes i believe they are domestic owners, and they don't like to listen to kids about imports. Thanks for your guys's help

Later

Steve