Avgas Is R33?

[black_gtst]

i have constant access to avgas due to being involved in racing boats. wondering if anyone knows if i can use 5lts or so in every tank as an octane booster? car is a 33 with minor mods, cat back 3.5, hks pod, blitz bov and running 10psi

also.... would i do any damage to my car running it on straight av for events like nats and track days? heard it can burn out cats or o2 sencors or sumthin!

cheers!

Brett

[paulr33]

i woudl expect both to be very likely, unsure if its safe or not

but you would certainly want a stand alone ecu to support it and tune around it

[oRiCLe]

avgas is a lead based fuel isnt it?? hence would not work...:S

Edited March 8, 2006 by oRiCLe

[R31Nismoid]

avgas is a lead based fuel isnt it?? hence would not work...:S

lead based doesnt matter as far as i understand. It's just illegal

AV Gas i dont think would yield any benefit. Unless the car is tuned for it, you really arent gonna see a lot of improvement.

No sure about burning the O2 sensor, someone will know for sure

[Angry]

o2 sensor will die a orrible death,

avgas is no longer lead base...... its lead free..... the octane level has dropped quite alot since the removal of lead .. i think its down to like 104 or something.... where it used to be aaround 115 in the early 80s and 90s.

ur really not going to see much of a gain ....even by tuning it ... ur not going to run avgas everyday.... and for 180cents a litre u might as well run methonal and water injection.

[RedEmblem]

I believe I know someone who has used Avgas in their R33 GTST S2. Seemed to go fine. Not sure of the performance improvement though (this was with a Mines ECU, so not exactly a common Aust. configuration).

[Bobjones]

OK, AVGAS is a DRY fuel, thus you should never go past a 10% mix as this will cause problems with fuel lines, fuel pump, injectors and so forth. Too much CAN actually cause more damage than the "perceived" benefit.

Also as it is a "dry" fuel it does not actually "mix" with the other fuel in the tank (similar to oil in water), however, that being said as both are fuels in the broader sense they do interact.

There is a slight performance gain, similar to that of using toulene or ethanol, it reduces the chances of knock and detonation and allows greater timing advance.

I have used this in many cars, purely at the track and NOT for everyday driving as the constant use is not good for the fuel system as mentioned previously.

Finally, with regard to the O2 sensor, too much avgas will not only see the death of this but also your cat. However, these effects are SIGNIFICANTLY reduced since avgas is no longer lead based. Thus a 5-10% mix, not on a constant basis should not have an effect.

I usually run 5% and have never had an O2 sensor fail, nor any other fuel system problems, I have seen 50/50 mixes do some nasty things to fuel pumps though...