well today i checked my timing and it was retared to 14 so i put it back to 16 which is stock and it definityly has better throttle response and pulls on alittle harder on the butt dyno. now would advancing it to like 18 be like the differce going from 14 to 16 also would my gas milage go down?

 

advance it as far as it will go and see where the valves hit!! its fun!!! really!!

 

enjoy the gas guzzling...

 

alight im just goona leave it at 16 then

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mr.beeks &raquo;</TD></TR><TR><TD CLASS="quote">enjoy the gas guzzling...</TD></TR></TABLE>

and top end power?????

 

uh... correct me if im wrong but I dont think advancing spark timing is going to change the relative valve/piston clearances... is it?

BTW, there may be some long term ill effects from advancing the timing... still not entirely known

 

advancing it to 18 btdc will u give u that little ummphh. go ahead and do it. advancing spark timing too much can cause detonation.

 

Advancing the timing makes more power to a certain point. That's the whole point of having tuneable ignition tables, so that someone can make the most power safely. It can mess up your motor, though, if you don't know where to stop, and you don't use a timing light. Some people just turn the distributor, and call it a day.

 

i advance it on my b18c to 18* and gain 3hp on a mustang dyno,it was 15* before , maybe 16*.


Modified by robtec at 5:55 AM 3/10/2004


Modified by robtec at 6:02 AM 3/10/2004

 

Don't forget to use 93 octane to prevent detonation. I advanced mine ('92 RS) to 18° and while I never put it on a dyno, it did make a noticable difference in top-end power.

IMO, go ahead and advance the timing - you can always change it back if you don't like it.

 

It is completely safe to advance your timing to 18; as long as you always use 91 octane or higher. It definetely gives you a little more kick in terms of response time. I advanced mine a year ago, and no problems at all. Just make sure you dont advance it past +2 degrees......

 

The more ignition advance you run, the harder it is on the starter and rod bearings. It's shouldn't be more than a long-tern concern tho. I haven't read any studies that say otherwise.

Combustion chamber temperatures will be higher, which can increase nitrogen oxide emissions as well as increase the likelihood of pre-ignition and detonation.

It's a very general way of tuning the ignition curve by moving the entire ignition map up. Some parts may need more than others, so while you're increasing torque in area, you might be doing nothing or hurting the performance in another. It's also possible that you may pick up power all over too. There's no way to know unless you have some way of consistently measuring results of changes to the distributor ignition timing, like a dyno.

Generally speaking tho, it'll increase part throttle driving performance.

I should also mention that a decrease in gas mileage is theoretically not an issue unless the engine is doing a lot of negative work while part throttle driving. Usually, it's the other way around where gas mileage increases with a little more ignition advance.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by IN VTEC &raquo;</TD></TR><TR><TD CLASS="quote">The more ignition advance you run, the harder it is on the starter and rod bearings. It's shouldn't be more than a long-tern concern tho. I haven't read any studies that say otherwise.

Combustion chamber temperatures will be higher, which can increase nitrogen oxide emissions as well as increase the likelihood of pre-ignition and detonation.

It's a very general way of tuning the ignition curve by moving the entire ignition map up. Some parts may need more than others, so while you're increasing torque in area, you might be doing nothing or hurting the performance in another. It's also possible that you may pick up power all over too. There's no way to know unless you have some way of consistently measuring results of changes to the distributor ignition timing, like a dyno.

Generally speaking tho, it'll increase part throttle driving performance.

I should also mention that a decrease in gas mileage is theoretically not an issue unless the engine is doing a lot of negative work while part throttle driving. Usually, it's the other way around where gas mileage increases with a little more ignition advance.</TD></TR></TABLE>

Now there's a guy who knows ignitions. Thanks

 

14-18 is STOCK SPECS, you can run regular 87 octane gas.

If you advanced your timing and then used 91octane gas, you would probably see little to no gains.

higher octane produces less power, 18 is stock spec and stock specs are for regular 87 or 89 octane gas.

BTW, i've actually dynoed my teg with advanced timing, unline these butt dyno experts, and I can tell you the gains are next to nothing. All the "better throttle response", ""gas guzzling" and "top end power" is completely crap. You really won't see much difference in anything between 16 and 18.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Eclipse spanker &raquo;</TD></TR><TR><TD CLASS="quote">

Now there's a guy who knows ignitions. Thanks </TD></TR></TABLE>

Now theres the guy who caused me to raise the question in the first place...

Invtec and I, being roommates with the same year make and model of car, get into conversations about the this and thats of tuning...

cut to the chase... Ben and I are running advanced timing... some time after we advanced the timing our cars both started making a wicked nasty sound from the bottom end... damn thing sounds like a diesel for a few seconds after startup

im wondering if the advanced timing isnt partly to blame for that

btw 2chron4u... correct me if I am wrong here but dont GSRs require 92+ anyway? or am I mistaken?

 

your correct the gsr is suppose to use premium