Increasing ignition timing

[JynX]

[color=#000000ost_uid0]Hi Guys,

Ive read alot of the posts in the forum and lantis's project and saw that some have increased their timing by upto 6 degress.

Not being much of a car mechanic, is this hard to do and are there any drawbacks from increasing the timing (or should I ask the bloke who services my car to do it). I know you have to run premium if you do it (what happens if you run normal unleaded) but the price of premium is pretty good atm so if I can get more gutts out of the NA motor it would be good.

Thoughts/Comments

Cheers.[/colorost_uid0]

[MrShadow]

[color=#000000ost_uid0]I'd also be interested to know what people think of this.

Thanks[/colorost_uid0]

[BigMal]

[color=#000000ost_uid1]Increasing the advance will increase output slightly but will
also increase the chances on ping (pre ignition). To
counteract this you run higher octane fuel. I wouldnt
go more than 14deg to allow for fluctations in fuel quality.
Advancing the timing plus a new cat back exhaust and a
K&N panel or pod filter will make the car noticeably more
nippy.

Regards

Mal[/colorost_uid1]

[JynX]

[color=#000000ost_uid0]I already have replaced the exhaust from cat back with 2.5" pipe. The guy at the exhaust shop said he wouldnt go any larger or you get too much back pressure. The muffler needs to be replaced however. Any recommendations on mufflers?

I like the dual tips u have mal, but I believe this requires 2 mufflers? (correct me if im wrong).

I also seem to get a large amount of carbon residue in the muffler tip. Is this due to the engine burning oil or simply normal residue?

Is advancing the ignition timing somthing I can do easily or should I take it to the mechanic and tell him to do it?[/colorost_uid0]

[BigMal]

[color=#000000ost_uid1]No its a MR2 style muffler. Simple chamber design where
the exhaust feeds into a centre chamber and can then
go out in two directions out the back. Mick got one last
month he can tell you a price.

Regards

Mal[/colorost_uid1]

[MrShadow]

[color=#000000ost_uid0]You can do just about anything you want on your car. You just need money, and know-how. I'd get it done by a mechanic.

AT least that way, if the engine goes *bang*, you've got someone to blame (and sue) [/colorost_uid0]

[JynX]

[color=#000000ost_uid0]Might have to make a trip to Mr Exhaust.
You use any1 in the shire mal or I have to cross the bridge to get a good job?[/colorost_uid0]

[BigMal]

[color=#000000ost_uid1]I got my 3" done at Bay Mufflers, My previous exhaust
done by A&P in Kirrawee but seeing you go to the gong a
lot Micks contact may be a good bloke to see. See if
we can drum up some business for him and see if he gives
us some discounts.

The black on the tips is fuel, happens mate and is worse
with the turbo with a vent to air BOV. All Astina's do it.

Regards

Mal[/colorost_uid1]

[sik astina]

[color=#0000FFost_uid5]hey jynx, i see you go to da gong uni. i live in da gong. i can find out a price for you coz i know the guy who owns a rotary shop(mums b/f) and did mine.. another thing tips anit cheap!!


-Mick[/colorost_uid5]

[JynX]

[color=#000000ost_uid0]Yeah mate that would be good. Getting to the gong aint an issue, I can visit mates whilst the car is in the shop. I remeber when I got my exhaust originally replaced it ended up costing around $800 or so that included the 2.5" pipe from cat, new muffler, and 4-2-1 (i think) extractors.

I would assume it will cost somthing similar to get a new muffler and 2 tips?

Is there any way to clean that crap off the muffler, I think ive let this one go to far (damn male laziness) but I dont want to fork out nearly a $1K and have the tips go all crap on me.[/colorost_uid0]

[BigMal]

[color=#000000ost_uid1]Nah I reckon about $150 for the muffler and anything from
$20 - $80 each for the tips. I paid $75 each for the Hitech
stainless, just got to polish them every now and again.

Mal[/colorost_uid1]

[O-LYM-PIC]

[color=#000000ost_uid0]i got a quote the other day for an exhaust system from hi tech on parra rd. they quoted $1050 for stainless from the cat back, with a hi flow cat. (no extractors).

for mild steel it was somthin like $400 for the cat back system and another $360 or so for the hi flow cat.

how does that sound?? i mite ring around a few at kirrawee, they got quite a few places down there, mite be slightly cheaper, and its closer to home. mal wheres bay mufflers??[/colorost_uid0]

[JynX]

[color=#000000ost_uid0]Bay Mufflers is in Brighton-Le-Sands from memory. Mal will confirm.

I already have stainless from cat back but I havent got a high-flow cat. I was looking at just replacing the muffler and getting 2 new tips. Might throw a high flow cat in if its worth it.[/colorost_uid0]

[bRaDiNhO]

[color=#FF0000ost_uid0]Cat makes a diff of about 2-3 kw. Pre 91 UK spec SP (GT) had 96kw, post 91 had 92. only diff was a more restricitve cat.[/colorost_uid0]