100 Octane Tuning

[mnetwork]

I am thinking of getting some 100 octane in my tank this week. I fixed my wideband issue, so I can finally do good tunes without going to the dyno. I was just wondering what A/F ratio I should be aiming for on 100 octane as I have no idea. Also, I wanted to see if anyone else has ran 100 octane on an E316G and what they're tune and results were like.

 

[JayRolla]

You should beable to get some good boost and timing on that fuel. I would shoot for 11.5:1 which is a good rich afr. Then about 14-18* max timing and 22-25psi of boost would be about right. If you can lean it out after that than you could just a little. Remember more boost and less timing makes more power than more timing and less boost.

 

[mnetwork]

You should beable to get some good boost and timing on that fuel. I would shoot for 11.5:1 which is a good rich afr. Then about 14-18* max timing and 22-25psi of boost would be about right. If you can lean it out after that than you could just a little. Remember more boost and less timing makes more power than more timing and less boost.

Isn't this what people do on normal pump gas (93 octane) minus the afr?

 

[1992awdlaser]

I would go for anywhere from 11.5:1-12.0:1 air/fuel ratio. I would get it to the 11.5:1 and then turn the boost up to where you want. Then increase timing once boost is set. Once you have some good timing(should be able to get close to 20* peak timing), try to lean it out to the 12.0:1.

 

[mnetwork]

How much boost have people been able to pull off on 100 octane?

 

[1992awdlaser]

I would shoot for around 23-25psi with that turbo. I would say more if it were a more efficient turbo at higher boost levels. I run 25psi with pump gas and 16* of timing. But that is with a 50 trim which isn't blowing hot air like your turbo will be.

 

[JayRolla]

The wiseman has it perfect. Yes thats where people shoot for pump but thats where you want to start. Like he stated once you happy with boost level and afr is good start to add timing till you cant anymore due to detonation then back it off a little. When I ran pump I could not get more than 18* timing at 20psi on my 16g.

 

[mnetwork]

Yeah, I can't run high timing at all... I'm at 22 psi (93 octane) right now and I can't really do more than 17 degrees. I always thought it was normal to get low 20s degrees on a 16g on pump. Is this true?

 

[JayRolla]

Not really. It blows hot air.

 

[mnetwork]

True, I don't know why everyone was always telling me 20 degrees is an average good tune. For me running 25 psi on 93 octane is very hard to do without knock even if I pull a lot of timing. I seem to be very consistent at 22 psi right now with 17 degrees by redline. I guess some of the people saying these things have 1g pistons.

 

[turboglenn]

True, I don't know why everyone was always telling me 20 degrees is an average good tune. For me running 25 psi on 93 octane is very hard to do without knock even if I pull a lot of timing. I seem to be very consistent at 22 psi right now with 17 degrees by redline. I guess some of the people saying these things have 1g pistons.

It's probably because they're talking about a 1g ECU, IIRC 17* is the max available timing by 7k RPM in a "best case senario" on a 2g car with stock ECU.

 

[mnetwork]

It's probably because they're talking about a 1g ECU, IIRC 17* is the max available timing by 7k RPM in a "best case senario" on a 2g car with stock ECU.

Well I'm talking about using DSMLink and what you're able to pull off. I always hear people saying 20-22 degrees on pump gas which I was only able to pull off on 16psi.. My car can handle 19-20 at 19-20psi... 22psi I do 17 degrees by redline..

 

[JayRolla]

20-22* timing is a lot and usually what a 1g has stock. You always hear the guys including me when I was on pump complaining about not getting more than 20psi because of the stock timing map. If I was back on pump I would run 16* max timing with as much boost as possible. If more timing was possible after the boost was at 23-25psi I would add some. I like lots of boost, rich afr and conservative timing on pump.

On e85 I run 30+psi and 22* max timing with usually no detonation.

 

[mnetwork]

20-22* timing is a lot and usually what a 1g has stock. You always hear the guys including me when I was on pump complaining about not getting more than 20psi because of the stock timing map. If I was back on pump I would run 16* max timing with as much boost as possible. If more timing was possible after the boost was at 23-25psi I would add some. I like lots of boost, rich afr and conservative timing on pump.

On e85 I run 30+psi and 22* max timing with usually no detonation.

You were using 93 octane?

 

[Sam@RRE]

Lucky bastards. 91 octane here =24psi, 11.3:1 afr, 10* of timing.
For 100 Octane, I usually go 25psi, 12:1 AFR, 21* Peak timing, this is on Sunoco100

Different brands of Race gas is different, 100Sunoco is NOT the same as 100VP

 

[mnetwork]

Lucky bastards. 91 octane here =24psi, 11.3:1 afr, 10* of timing.
For 100 Octane, I usually go 25psi, 12:1 AFR, 21* Peak timing, this is on Sunoco100

Different brands of Race gas is different, 100Sunoco is NOT the same as 100VP

I happen to have a Sunoco in the area that carries 100 octane so that is what I'll be using. I'll probably start out with high 11s a/f and work my way to 12. Timing seems about right.

 

[JayRolla]

Lucky bastards. 91 octane here =24psi, 11.3:1 afr, 10* of timing.
For 100 Octane, I usually go 25psi, 12:1 AFR, 21* Peak timing, this is on Sunoco100

Different brands of Race gas is different, 100Sunoco is NOT the same as 100VP

I was running 91 octane also. I couldnt pull more timing sinse I was on an safc using the CAS to pull timing. If I had timing control back then, most likely I would have ran 12-14* timing with 20+psi.

On e85 I have ran as much as 28* timing at 30psi and 11.5afr on my brothers car with no detonation (1g pistons).

I get a very little inconsistent detonation (2g pistons) if I run more than 24* timing on e85 at the afr and boost level.

 

[mnetwork]

Ok.. got 30 bucks worth of 100 octane right after my gas light turned on. I guess it mixed with a little less than 2 gallons of 93 octane. Here is what I came up with. I didn't get to lean fuel out anymore than my 93 octane tune (afr 11.1-11.3) because for some reason my wideband was acting crazy even though it was fine two nights ago... The car feels very fast, definately faster than before and feels very very fast after 5k.

Here are the logs. The boost was 25, but would spike at 26ish for a little bit.

 

[T9S1i]

i just dropped 9 gallons of 100 octane in my tank, and i have another 15 sitting in my garage.

Im planning on going to the dyno next wednesday for some tuning, i'll post up what i get away with when it happens.

 

[mnetwork]

Yeah, post up. I think I'm going to dyno the car like this in the near future. I was pulling off more timing, but I started getting knock and I had to stick with this which still felt very fast.