BBsAcuraRacing

First time I drove the CL in a short while. I took it out today washed it and filled with 3 gals 110 octane and the rest 94. The combination makes the car feeel like it has much more midrange and it will shift through the gate at 7100 - 7200 RPM before the rev limiter kicks in.

Is this the ambient temp causing this or the high octane or both??

acura_service

hmm, i always thought higher octanes didn't do anything unless your compression was higher (then of course you would need it)
higher octane burns cooler, although it does have a more complete and consistant burn

KCPreki11

I think higher octane only really excels in forced induction cars where this is boost involved. It helps the engine not detonate as much allowowing the boost to be higher yielding more HP.

Achance

I use to have a J&S safeguard system on my ITR hybrid, and when I went to the track to race i would use 110 octane. I was able to tell that I was getting less dettonation (it had an electronic meter) And when I used the race gas, the safeguard system didn't activate as much so I was able get some more performance out of car. So higher octane does work a little bit, but that is only when you are pushing your car to the max. Which in my case was when I was doing 9000 rpm shifts.


and for those who don't know a safeguard system is. It is a computer you hook up to your car that listens for detonation and prevents you from blowing up your engine. When it hears knocking or pinging, it only retards the timing on that cyclinder (s). So with this system you can advance your timing a couple of degrees, and then let the computer correct the settings when it senses trouble brewing. Unlike the stock computer that reduces power to ALL cyclinders. It is a cool system and it is only around $400-500 and also came with a a/f meter. They now have out a more advanced system but I'm not sure what new features it has.

Rock Dog

Where did you get the 110? I'd be willing to do a comparo as well.

acura_service

if you want higher octane, do it the right way, get it straight from the pump, VP C12 107 octane or Sunoco race fuel 108 octane or you can try Cam2 i think its 112 octane

DRM600

don't fuel above 100 octane or so contain lead? isn't lead bad for our everyday cars?

BBsAcuraRacing

So you burn through an oxygen sensor now and then. Thats what the warranty is for....right?

BBsAcuraRacing

So you burn through an oxygen sensor now and then. Thats what the warranty is for....right?

moomaster_99

The highest octane is 110 for unleaded...anything above that is leaded or alcohol or nitromethane or anything but regular pump gas. As for working on turbos only? I don't think so, the high compression on our cars would benefit from the increased octane. They tell us to use a MINIMUM of 91 octane...this is to avoid detonation. And for those of you who know JDM cars and why they put out about 10-20 more hp than their US counterparts is partly due to their raised compression and use of 96+ octane fuel in Japan.

Nitin

iTrader: (1)

You can say that again....I didn't mean it literally.

RedTypeS

FYI - If your engine is not pinging, higher octane gas does NOTHING except empty your wallet faster. Higher octane gas does not have any more energy (BTUs) than a lower ocatane gas. With higher ocatane gas you can be a bit more aggressive with your timing, that's it.

typeR

this is an area i belive to be un exploited at this time...if the engine isnt pinging????hmmm if it were pinging before you heard it the ECU would retard...now that you have an octane that wont pre detonate the ECU advances...and the cold weather sure doesnty hurt.....

EricL

I'm in Los Angeles, with crud gas, so...

I have spent plenty of time putting in varying amounts of 76 100-octane in with the 91-octane gas.

The "stuff" makes for a difference of around .2 - .3 seconds in 0..60 run (average of a ton of tests run at the same location).


I don't know where you are getting 110-octane unleaded, as they only have the 100-octane unleaded at 76. The higher-octane fuels are leaded (100 octane and up [at least from 76]). (See 76.com and look under products)

There is also the issue of the "rocket fuel" having a lot of additives and a different mix of fractions. There may be more than just the octane at work -- who knows...

There is also a very good possibility that the knock sensor rolls back the advance (with 91-octane), and I doubt that you would be able to hear it working. You would need a tool (as suggested) to monitor the ignition map (advance/retard) with the different fuels.

Depending on combustion chamber design, temperature, and other factors, some cars will ping like crazy on 91-octane (Ok, mostly older cars...)

Finally, some of the "race fuels" have higher oxygen content and it is possible to gain power from that alone (see link and excerpt).

Link: http://www.nsxprime.com/FAQ/Miscella...lAdditives.htm

Excerpt:


...

What is it that makes race gas so different? What's it made of? Sunoco tells us their GT PLUS 104 octane unleaded race gas is only 15-20 percent traditional gasoline, and about 85 percent additives! Actually there are about 120 different chemicals in GT PLUS. One reason it isn't street legal is the high oxygen content. The EPA requires that the oxygen content of a street legal fuel cannot exceed 2.9 percent. GT PLUS is about 3.5 percent oxygen. This fuel is light in weight at only 6.14 lbs-per-gallon. The high oxygen content improves the octane, and when the induction system is properly calibrated, this fuel will help make additional horsepower. The high oxygen content has a supercharging effect, since 3.5 percent oxygen is the equivalent to about 17 percent more air. Different fuels can actually alter horsepower 5-to-10 percent or more.

...

typeR

there is a 110 octane fuel here called c-12 if i remeber correctly, and it is unleaded...