02*C5

iTrader: (1)

So I got my car re tuned for the 3rd time. I am running 20 degrees of total timing because the new tuner told me that at anything above 20 I am going to have issues, specially at higher RPMs and on really hot days because I can only get 91 Octane.

100+ Octane is sold at the track only and all I want is to be able to run 93 or 95 octane full 25 to 28 degrees of timing and not have an issue with detonation its an N/A built.

Toluene is the best (cheap whole sale) and easiest way to boost octane I have no cats so no worries there some one said since i have no cats to add the GUNK lead substitute but I wanted to hit him on his head because that will kill my O2 sensors

Has any one ever done Toluene or Xylene and can anyone give me advice. Tried the fuel section got some looks no one is willing to say a dam thing.

Thanks guys

brianfromhawaii

iTrader: (3)

theres a thread on this bro... try to find it, do a search for those two chemicals, a couple guys got contacter accounts and bought it in bulk i guess.. get another ecu thats what id do.. get a second ecu

02*C5

iTrader: (1)

I also read in the thread there about adding E85 to gas I am going to try that since the local gas stations has it. I thought about it but I had read for the E85 you had to pretty much change your whole fuel delivery system, and I didn't know how much damage 4 gallons to 12 of 91 would do to me but I'll give it a try. If not gives me an excuse to get a whole new fueling system and ECU.

Maybe I should change out the fuel filter too before i do it hu?

Thanks for the info.

garygnu65

could you buy a 5-55 gal drum of high octane unleaded from any body locally? a local speed shop here has 5 gal drums of vp unleaded.

nastychevelle

iTrader: (7)

https://ls1tech.com/forums/advanced-...e-booster.html
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02*C5

iTrader: (1)

You know I would try the home brew but if I mess that up then its a new engine instead of a new fuel delivery system. I read the whole post already and it said to add mineral spirits (doesn't burn very good) and tranny fluid for lubricant (doesn't tend to burn well either)

94dragbird

iTrader: (6)

Not saying that this compares well but the jr. dragsters at my local track add tranny fluid to their fuel for lubrication.

nastychevelle

iTrader: (7)

plenty of dsm guys and GN/t-type guys have been doing it most dont even add the tranny fluid or mineral spirits

ms4z28

I'm running 28 degrees of timing no issues on pump gas and it was over 100 yesterday...

slt200mph

iTrader: (42)

You need to find another tuner

01ssreda4

iTrader: (96)

i agree......

gmtechnician

i was running 28 degrees in my 06 5.3L with 91 octane. never had a problem and it gets hot here. new tuner time.

amadeospike

iTrader: (1)

20 degrees is too little. I know some vehicles like the newer ls2 based run less but 20 is just too little even on those.

02*C5

iTrader: (1)

Maybe if I gave some specs and info it would help
Cam 232/238 600/600 109LSA
Elliot Port Works 241 stage II 59CC bowls from 66cc (305@600 217@600)
2.02 and 1.60 valves
11.5 to 1 compression

am at 2500 altitude and on hot days 110 like it was Saturday it cam make the computer read more like its 6000K feet because of how thin the air can get.

3 different Tunners, the last 2 want me to sell my set up and get theirs go figure.

hammertime

iTrader: (1)

I plugged similar numbers into the Piano Prodigy VE calculator. With 11.5:1 compression and a Comp 232 XE-R lobe installed on a 109* ICL, I'm getting a dynamic compression ratio of 8.78:1 on a 346. If you are advanced at all, it would be higher. To get that ratio with a 59cc combustion chamber and a flatop required a .050" thick gasket. Your lobes are somewhat different, but this should be indicative of your setup as well.

8.8:1 is generally accepted to be on the high end of the range for 93 octane fuel. Since you are at a higher elevation than sea level, less air usually requires less octane. Are you marginal with 91? Perhaps, but your tuner should be able to do better than 20*.

ms4z28

Dude I have ms4 with prc 2.5 heads and I have no problems the compression is slightly higher cuz of a smaller chamber to but not really sure what it is...

00MaroonZ28

iTrader: (3)

You should be able to advance it past 20 degrees of timing. I'm running 11:1 at 26 degrees and have no problem using 91 octane. Given it doesn't get that hot here, but I was still fine when I went down south where it was well over 100 when I visited there.

If you're thinking of running E-85, you're gonna have to get a completely new tune for the E-85 and your injectors and fuel pump better be able to keep up cause you need to pump 20% more gas into the cylinder than pump gas to run on it. Then, you have to run E-85 all the time so you can't get caught in an area without it. It's a great alternative to race gas and it's way cheaper. I run it in my car since it's plentiful here in Minnesota and I don't drive the car very often, but there are downsides to it.

jmm98LS1

iTrader: (28)

+1 on more timing. I'm running 12:1 SCR/8.7 DCR with 24-25 degrees timing on 91 octane pump swill. It gets HOT here, no knock retard at all.

bjamick

iTrader: (31)

What kind of compression are you running? Did the tuner even try to add timing, or did he just tell you that's where he's putting it at? Take it up to 26* make a pull check for knock, then take it to 28* and make a pull. If there is no knock retard, then leave it be. Or if you want to try it, take the timing up a little more to see if the motor likes it or not. If you get more power, and torque and no knock then leave it alone and make sure the A/F is in good shape along with it then call it a day.

Most likely you just need to get another tuner.

nastychevelle

iTrader: (7)

guess you didnt see it