3sgte gas, What do you feed your car? Options

[Legit94GT]

ok this is for anyone who has a celica that has 3sgte in it...
I am almost at the point of buying my front clip but am curious as to what gas everyone in tha states runs it on. I cant remember where i read it but i think it needs like premium gas to run, or something above 93 octane... so when you guys fill up what do you put in to feed you 3sgte?

[Penkka]

I have a 3S-GE though, but im running on 95, sometimes 99+ (Shell V-Power)

[lagos]

93 pump gas with water injection. Brand names don't matter, gasoline all comes from the same place and octane ratings are all regulated.

[Insanity-74]

It depends upon what ECU your running.

If you have a jap ECU then you should run high octane fuel as that is what it is mapped to run on...if you can get hold of a UK ECU then you can run pretty much what you like as it is mapped to handle lower octane petrol. If you have an after market ECU then you should run it on whatever it was mapped with. On the whole most people like to run the best pertrol you can buy/have access to.

Petrol quality can vary wildly, it does all start from the same point...under the ground...from there it can be different from station to station. The likes of Shell and BP are probably the best to buy.....shell has a higher octain rating and seems to be more resistant to knock than other fuels...BP (I dont know why) produces more torque...both are brewed to be high octain fuels and dont contain as many additives as some of the cheaper petrol...one of the high octain supermarket fuels in the UK is just brimming with additives, its classed as 99ron but contains alot of crap...one of them being silicone which can effect the O2 sensor.
Also the popularity of the garage can help....a busy garage will have a constant supply of fresh fuel...petrol does have a finite life and goes "off" suprizingly quickly. If you want the best possible power from your petrol...pck a brand of petrol where the high octain petrol was made to be that way...not regular petrol with additives...also go for popular busy garages that will have fresh fuel.

This post has been edited by Insanity-74: Mar 1, 2008 - 4:03 AM

[3SGTE]

mine is a jap import. i sometimes use 99ron octane but usually just use the normal 95 and she runs good. you can notice a power difference when using the 99 octane, but it aint essential i would say

[bslik]

i thought it had somethin to do with your compression ratio, like anything over 10:1 u need high test.... but lower than that just use what you want

[Insanity-74]

mine is a jap import. i sometimes use 99ron octane but usually just use the normal 95 and she runs good. you can notice a power difference when using the 99 octane, but it aint essential i would say

If your running more or less standard then you might get away with it, mine actually feels better with low octain petrol, but when you check out the knock levels (I have an aftermarket knock sensor) they climb alot higher with regular petrol so its really not worth the risk unless you can aford a nice rebuild soon.

[Legit94GT]

ok, well I guess I don't know what a Knock sensor is, could some on explain that two me? Will I need to have one when I do my swap?

Why would the octane level increase or decrease the amount of knock I get?

[Insanity-74]

Very Basically - Knock is caused by fuel getting ignited in the combustion chamber by something other than the spark plug either in the wrong place causing 2 flame fronts or the wrong time. this causes a noise (if you listen with some det cans) that sounds like a crisp/chip packet rustling. A small microphone picks this up..that is the knock sensor. 3sgte engines have them as standard (tucked away on the back of the engine behind cylinder #3) and the ECU can detect this and make a suitable adjustment to the workings of the engine to try to combat it. There is a point where the ECU cant do anything about it...this is when you get problems and the engine goes into limp mode.
High octane petrol is more resistant to being ignited by anything other than the spark plug..basically it is harder to ignite than standard petrol.

This post has been edited by Insanity-74: Mar 1, 2008 - 5:11 PM

[Legit94GT]

Very Basically - Knock is caused by fuel getting ignited in the combustion chamber by something other than the spark plug either in the wrong place causing 2 flame fronts or the wrong time. this causes a noise (if you listen with some det cans) that sounds like a crisp/chip packet rustling. A small microphone picks this up..that is the knock sensor. 3sgte engines have them as standard (tucked away on the back of the engine behind cylinder #3) and the ECU can detect this and make a suitable adjustment to the workings of the engine to try to combat it. There is a point where the ECU cant do anything about it...this is when you get problems and the engine goes into limp mode.
High octane petrol is more resistant to being ignited by anything other than the spark plug..basically it is harder to ignite than standard petrol.

Oh ok, thank you for explaining that perfectly:)

So when/if it starts knocking how does it tell you? if there like a gauge or a light that comes on?

So i can only fine 92oct at gas stations, including shell v-power... is that the same as 99 ron?

If i bought a front clip off of a USDM Alltrac would i even have to worry about it?
Should i only worry about high octane gas if i get a front clip off of a JDM, or from the UK?

[Insanity-74]

The knock sensor that comes with the car ie the standard one has no lights or guage or anything, the ECU just reacts when it encounters it. After market guages come in numerous forms, the most comon being a row of 5 or so lights, the first light being normal running conditions..as they progress obviously the knock is occuring (second light) and getting worse until the last light which is usually bigger and brighter than the others comes on which is usually a good point to choose to take your foot off the loud pedal a bit.

I have no idea how the octain rating system works in the States so you`d have to tell me I`m afraid. The quality of the petrol in general is better than it is here due to a stricter monitoring system and diferent method of grading. I would imagine that if you have a USDM front clip then the ECU is already tuned to accept the petrol that is available over there so I wouldnt give it much thought. I would however look into getting the best petrol you can should you get a Jap ECU....I know how you Celica fans from over the pond have this love of Jap parts, but they are not always better than what you have there already. If you get a UK one i will pretty much run on anything.

Yes Shell V-Power is 99ron....well it is in the UK. I guess its the very same stuff over there.

This post has been edited by Insanity-74: Mar 2, 2008 - 4:32 AM