Running V Power Racing 100 Octane Fuel In Engine Tuned For 98

[BaysideBlue]

Hey guys,

My gtt has around 250kw at the treads with an aftermarket turbo, pfc and all. It was tuned with Shell V Power 98.

I was wondering if i run V Power Racing 100 at the drags, would it help or hurt the power output? is the different fuel gonna mess up the tune, a/f ratio and etc? hence good or bad for engine/turbo?

Cheers guys

Edited July 29, 2007 by BaysideBlue

[CEF11E]

not a ad idea at all. it will not improve your performance at all but will make your safety margin slightly bigger. will also not mess up your AFR's.

[zebra]

not a ad idea at all. it will not improve your performance at all but will make your safety margin slightly bigger. will also not mess up your AFR's.

I agree, you will improve your protection from pinging but you may actually lose a couple of killerwatts due to to fuel being less volitile....(burns slower so you need to add more timing to compensate) but i doubt that you would notice as it would be more to do with air temp/relative altitude than 2 RON difference in fuel.

Andrew

[siddr20]

How about putting a octane booster in? which ads like 7 ron or something?

Edited June 24, 2007 by siddr20

[Devils_Advocate21]

or how bout tolulene better than octane booster

the higher the RON the richer the tune will be i think

[BHDave]

Stick with your usual fuel and octane booster. You won't gain 7 points on anything but base unleaded, maybe 2-3 tops on 98 octane.

I recently ran some nulon pro strength through mine on the dyno and it had no effect on the mixtures and increased the detonation threshold significantly (enough that i could add 5 degrees of timing before any audible pinging).

Adding toluene effects your mixtures as you have to add so much of the shit to get a significant increase in the RON of your fuel. Were talking 5-6 litres per tank of fuel (thats near enough to 10% by volume) to get a couple of point increase.

[Abo Bob]

I have found that vpower racing leaned my AFR's from 12.5 to 12.7 on average. Let me add 2 degrees extra of timing. I use it and my car was tuned on 98. I have similar power to you.

[mad082]

Adding toluene effects your mixtures as you have to add so much of the shit to get a significant increase in the RON of your fuel. Were talking 5-6 litres per tank of fuel (thats near enough to 10% by volume) to get a couple of point increase.

and if you stuff up things can go pretty wrong. i was asking my mechanic about toluene and he said it is better to stay away from it cause a small mistake can have large consequences.

[r33_racer]

Depending on how far you want to go, toluene is the best option. It only aided F1 back in the 80's to achieve the high horsepower figures they had and ran.

Problem with the octane boosters is the higher the initial ron of the fuel the lesser increase you see from adding it.

mad082 can you explain your mechanics reasoning for not using/advising toluene?

[Bass Junky]

V-Power will actually LEAN OUT your mixture, not richen it up.

Not by a lot, but mine went from 12.0 to about 12.2 on the Optimax Extreme.

When I put it in my car, I normally leave the AFR and just add some timing.

But I don't use it often.

[Abo Bob]

Listen to Bass Junky, particularly when he agrees with me.

[wizlb]

Which octane booster brands are you guys using.

I have a 96 GTS-T SII.

Thanks

[BaysideBlue]

thanks guys for the replys.

so using 100 octane fuel on 98 tuned engine will lean out the mixture which would increase safety margin but need to adjust timing. how exactly do i do that?

and also, is it worthwhile doing (pay the extra cost for v power racing + adjusting timing) for the so said slight increase of safety margin, without any real performance increase over the quater mile?

[Bl4cK32]

so using 100 octane fuel on 98 tuned engine will lean out the mixture which would increase safety margin but need to adjust timing. how exactly do i do that?

rule of thumb is if you are asking how to tune your car then dont do it yourself. Get a tuner and a dyno

Edited June 26, 2007 by Bl4cK32

[BAMR33]

higher-octane fuel will lean out the mixtures, except as the the octane level is the fuel's rating of resistance to detonation it will probably be safer for the motor.

However, using a higher octane fuel without a tune may not see any gains because the burn rate will be reduced and the motor will not be running optimally. Best bet, just run 98octane what your car was tuned with.

If you really must, an amateur way of adjusting ignition timing to get the most out of a higher octane fuel is done by moving the CAS anti-clockwise slightly, test driving and repeat until you reach an acceptable knock level i.e. 20-30. Or read up on paulr33 PFC guide.

Edited June 26, 2007 by BAMR33

[BaysideBlue]

higher-octane fuel will lean out the mixtures, except as the the octane level is the fuel's rating of resistance to detonation it will probably be safer for the motor.

However, using a higher octane fuel without a tune may not see any gains because the burn rate will be reduced and the motor will not be running optimally. Best bet, just run 98octane what your car was tuned with.

ok sounds like theres no point using v power racing without a tune or at least adjust timing then.

If you really must, an amateur way of adjusting ignition timing to get the most out of a higher octane fuel is done by moving the CAS anti-clockwise slightly, test driving and repeat until you reach an acceptable knock level i.e. 20-30. Or read up on paulr33 PFC guide.

thanks i will try that.

[BaysideBlue]

How many degree anti clockwise turn would be safe normally if i dont check the knock level after adjusting timing? thanks

Edited July 1, 2007 by BaysideBlue

[r33_racer]

if thats how your planning on doing it. Dont bother. Unless you got a timing light and your checking base timing as you go, its not worth it mate. Will probably cause more problems then its worth.

[Cameron_Datto]

http://www.bp.com/liveassets/bp_internet/a...ctane_power.pdf

[4drftn]

running a higher octane fuel in my 33 rb25t made my car run a whole lot better...