Timing

[bitter]

simple question, would i see any gains from advancing my timing and using higher octane gas?

[Super Jamie]

simple answer, yes

[bitter]

simple answer, yes

whats the not simple answer and what could i gain by advancing? how much advance and what octane gas for what hp? would it shift my powerband?

[bitter]

Thats where a calculator and a search engine like google would help :thumbsup:

 

By advancing timing, you will get a lot more "oomph" off the mark, but it lowers the torque of the car (e.g driving up a hill you would notice that its more sluggish)

 

By retarding the timing, you won't get the punch off the mark, but if you can ever make it to the top of 5th gear you would notice that you were a fair way further off the clock than if you had advanced the timing.

i see....so basically....i should just leave it be because it wont add overall power, just give some top end or do nothing. i like having my peak torque at 2800 RPM, it gives a lil kick in the seat off a good launch even for a lil engine.

[Super Jamie]

the not simple answer requires you to tell us what sort of engine you have, what you've done to it, what the stock timing is, and what sort of fuel you're thinking of switching from and to

[kangaroosa]

A quick search brought up these.

 

http://www.rollaclub.com/board/index.php?s...=advance+timing

 

http://www.rollaclub.com/board/index.php?s...=advance+timing

 

http://www.rollaclub.com/board/index.php?s...=2489&hl=timing

 

Hope it helps.

[bitter]

the not simple answer requires you to tell us what sort of engine you have, what you've done to it, what the stock timing is, and what sort of fuel you're thinking of switching from and to

well its a fed spec 7a-FE. one O2 sensor before the cat. its all stock except for a modified intake. i just yanked the lil snorkel and now it pulls the air right into the bottom of the filter box through a hole thats 2x larger than the snorkels inlet. it feels like it has more oomph off the line and it revs up a lil faster when i tap the gas pedal.

 

 

sorry, i didnt really think to search.

[bitter]

Don't panic it - sometimes its hard find the exact search you are after, its the same for me - most of the time people are looking for an easily worded answer rather than all the technical crap they don't need to know.

 

This is the nature of the internet

there was that...and the fact that theres little talk of the 7a-FE here or on the internet in regards to things like changing timing. the 7a-FE was only in about 1/4 of the corrolas and prizms sold, so there isnt alot out there on it.

[irokin]

one O2 sensor before the cat

well that WOULD be a good place for it...considering it wont work properly after the cat

[bitter]

one O2 sensor before the cat

well that WOULD be a good place for it...considering it wont work properly after the cat

one pre cat as opposed to one befor and one after or one before the pre-cat then one after the pre-cat then one after the cat. its a non heated O2 tho :thumbsup:

[demuire]

By advancing timing, you will get a lot more "oomph" off the mark, but it lowers the torque of the car (e.g driving up a hill you would notice that its more sluggish)

 

By retarding the timing, you won't get the punch off the mark, but if you can ever make it to the top of 5th gear you would notice that you were a fair way further off the clock than if you had advanced the timing.

 

Funny you should say that. I changed the timing in Haikals car today from +4 to +12 degrees, and it definately feels more torquey and more powerful!

[bitter]

these cars, are the carbed with out an ECU carbed with an ECU, or are any of them that you guys have advanced fuel injected with an ecu?

[mikeys toy[RL]]

bitter; i think your timing is computer controlled, you can mess with the base timing, but the computer will just try to correct it. i would just set it at factory spec

your car is also obd-1, two sensors would be obd-2.....just be glad you're not obd-3.......

[bitter]

yes, odb-1. very basic ecu compared to more modern cars. I'm not sure how changing the timing will get along with the ECU, it has a distributor if that makes any difference timing is either 10 btdc or 15 btdc. the emissions sticker says 15 but on another sticker, an older one, it says 10 :thumbsup:

[TRD ke70]

just thinking that you might have to earth out a lead or put the computer in to timing mode before you touch anything, as for changing the timing, you could do more damage than good. i'd stick with what the factory says.

 

what other mods has the engine had.eg, cam, head work???

 

changing just the stactic timing won't yield much HP, but you can F**k the engine if you give it too much.