Race fuel for 98 ga16de??

wizeguyz · Sep 18th, 2005, 06:08 PM

befor i get my 1/4 mile time i was thinking of doing 110 octane "race fuel" in my ga16de my mods are i/h/e and andvanced timing and only 93 octane fuel all the time. So my question is, is this safe any precautions and any gains? my 1/4 mile time should be pretty good right? anything helps!

**wes** · Sep 18th, 2005, 09:27 PM

Quote:

Originally Posted by wizeguyz

befor i get my 1/4 mile time i was thinking of doing 110 octane "race fuel" in my ga16de my mods are i/h/e and andvanced timing and only 93 octane fuel all the time. So my question is, is this safe any precautions and any gains? my 1/4 mile time should be pretty good right? anything helps!

Not worth it. And if you have a cat leaded race fule is NOT it's friend..

Zac · Sep 18th, 2005, 11:56 PM

Quote:

Originally Posted by wes

if you have a cat leaded race fule is NOT it's friend..

tell me about it

and the difference over 93 octane will be minimal

himilefrontier · Sep 19th, 2005, 01:57 AM

Actually, using too high an octane will hurt, not help performance. The reason octane goes higher is because of a longer burn rate, which helps quell detonation. If you are not in detonation, the slower burn rate will actually make less power than a lower octane fuel that does not detonate. Oh, and yes, leaded fuel is a good way to kill your catalytic converter and oxygen sensor(s).

scrappy · Sep 19th, 2005, 02:11 AM

When does gas become leaded vs unleaded? Is it 100 and up is leaded and 94 and below is unleaded?

himilefrontier · Sep 19th, 2005, 02:16 PM

Quote:

Originally Posted by scrappy

When does gas become leaded vs unleaded? Is it 100 and up is leaded and 94 and below is unleaded?

At the refinery. Tetra-ethyl lead was originally designed in the 1920's by General Motors as a way to increase the octane rating of fuels. It also had a good side effect of reducing valve seat wear, as engines of the era needed valve jobs regularly, sometimes in as little as 12,000 miles! However, in the 1970's , it was revealed that lead caused birth and developmental defects in children. So, starting in 1972, lead was gradually cut from pump gas ( and cut all together in 1989), and in 1975 with the advent of catalytic converters, unleaded fuels were made available. Now, in order to combat valve seat recession, hardened valve seat inserts were introduced around 1972 and so today excessive seat wear is not a problem. Today, we have unleaded fuels available in higher octanes than 93, but you must purchase it as such. The octane rating of these fuels is raised with additives like Tolulene and Xzylene, so there are 100+ octane unleaded fules available.

DanTheMan · Sep 21st, 2005, 07:20 AM

As far as "race fuel" 100+unleaded is available but as above, the burn rate is longer (decreasing detonation but prolonging combustion). I have run a 104 unleaded SUNOCO fuel in my ga16de with no problems and it did have some more kick off of the line with this, but it was an oxygenated fuel with a certain percentage of oxygen added to it by volume. Somebody said that this was "cheating". Hey man if that's cheating your garrett turbo is a forefeit! It just helped keep the burn rate from sapping power as stated above, and made for a more complete combustion (leaner at WOT).
So, if i'm running 16BTDC on 92 what kinda timing should I run on oxygenated 104? (somebody will say just advance it until it pings and turn it back a notch, but, it will never ping, it's got a knock retard sensor right? I can't make it ping if I wanted to!).
On another note, Can I just slap a sunny front-clip onto my 1997 gaB14?
That would be soooo nice!

**chimmike** · Sep 21st, 2005, 07:29 AM

high octane gas does not make more horsepower. Never has, never will.