[Coupes33]

Originally Posted by Brule

Good times.

Thanks Brule. I was hoping for times a few tenths better to be honest but I think the 12C higher ambient temperature and track condition didn't help.

[Brule]

Originally Posted by Coupes33

Thanks Brule. I was hoping for times a few tenths better to be honest but I think the 12C higher ambient temperature and track condition didn't help.

Yea ambients will change mph for sure.

[shannon1]

Nice one Coupes.

[Coupes33]

Originally Posted by Aus335iguy

Weapon. Well done Mr Coupes!

Thanks Aus335iguy. With a cooler ambient temperature, better traction and a bit more timing, I reckon the times could be reduced by a couple of tenths. The timing corrections or lack of is what has me thinking at the moment.

[Coupes33]

Originally Posted by shannon1

Nice one Coupes.

Thanks Shannon1.

[rev210]

On the E85 and timing corrections, United use different base fuel for the 15% , they state its 'premium 98 or regular petrol' with the rip off approach at the moment I am very sure its regular petrol now. Plus E85 and other E level mixes require you to run an anti gum additive now and then too. I use fuel doctor. Over time you can wind up with black goo in injectors and things.

Nulon pro strength is a good booster NF is even better if you wanted to add to E85 (very low amounts needed 1ml per litre ) https://nitrous.com.au/

[Coupes33]

Originally Posted by rev210

On the E85 and timing corrections, United use different base fuel for the 15% , they state its 'premium 98 or regular petrol' with the rip off approach at the moment I am very sure its regular petrol now. Plus E85 and other E level mixes require you to run an anti gum additive now and then too. I use fuel doctor. Over time you can wind up with black goo in injectors and things.

Nulon pro strength is a good booster NF is even better if you wanted to add to E85 (very low amounts needed 1ml per litre ) https://nitrous.com.au/

The biggest advantage of the octane booster is performance through the prevention of knock and pinging more than increasing power through an increase in octane. Nulon claims an octane increase of 7 but in the real world you may see an increase of 2-3(100-101 octane). However, the prevention of knock will eliminate the timing corrections which will improve performance. I agree with your comments on the E85. The quality varies as does the octane level. The cooling effect of the ethanol is a plus but as a daily used fuel, it is quite expensive ($1.70 L compared to $1.30 L for 98 PULP). As a daily driver, I find a lot of advantages using the octane booster due to cost and extra range. Doing a exercise on this, I calculated the cost of using 98 PULP + OB to be $0.183/km compared to 100% E85 at $0.275/km. The other advantages are there is no requirement to spend thousands of dollars on fuel systems and PI/Helix/double HPFP and you can get fuel at any servo. Also, there is a big difference in range (545 kms with 98 + OB compared to 370 kms with E85). Obviously, the power levels are not the same so if that is what you are after, E85 is definitely the only way to go.

[rev210]

Makes a good argument for meth too. My Aquamist is getting reconnected. Ive got some NF to put in the E85 to see if it corrects the timing pulls. On 20% E its solid.

There is a knock engine based review from 1999 that has a bunch of octane boosters (inc toluene) and base fuels like VP103 and nulon and the NF race both up the RON by 2.8 on reccomended doses. NF is harder to find but, its better for dosage cost.

[Coupes33]

Originally Posted by rev210

Makes a good argument for meth too. My Aquamist is getting reconnected. Ive got some NF to put in the E85 to see if it corrects the timing pulls. On 20% E its solid.

There is a knock engine based review from 1999 that has a bunch of octane boosters (inc toluene) and base fuels like VP103 and nulon and the NF race both up the RON by 2.8 on reccomended doses. NF is harder to find but, its better for dosage cost.

I will be interested in the results of adding the octane booster to 100% E85 to see if the timing corrections are reduced. I have just received a revised tune from Ken (Wedge Performance) for 98+octane booster. In his words "Let's turn it up a bit and get you in the low 11's." Next Test N Tune is on the 24/10/20 so if the weather is ok, I will give my car a run with this tune.

[Brule]

What have your intake temps been?

98 fuel and drag racing is a recipe for high temps. Anything over 120f will be pulling timing. And them logs from July are running minus degrees adv in some points of the run.

I have just opened up datazap on the computer to have a look. No iats in logs.

[Coupes33]

Originally Posted by Brule

What have your intake temps been?

98 fuel and drag racing is a recipe for high temps. Anything over 120f will be pulling timing. And them logs from July are running minus degrees adv in some points of the run.

I have just opened up datazap on the computer to have a look. No iats in logs.

Yes I know Brule. I have added IAT to the data list now so in future, I will be recording it. Ambient was 25C on the day. That would be a cool day for you in Darwin.

[Brule]

Originally Posted by Coupes33

Yes I know Brule. I have added IAT to the data list now so in future, I will be recording it. Ambient was 25C on the day. That would be a cool day for you in Darwin.

I wonder if thats the timing issue?
Do you put aftermarket pistons in?

Anything under 25c is only for a few days a year.