vtruong1

COOL!! Thanks for the info. Will get on that mod asap. What is the ECT mod?? Got any info or writeup on it?

midiwall

Wow... this question went unanswered for a while. Sorry!

The ECT mod is documented here:

https://www.yotatech.com/~corey/tech/dr_z_ect/dr_z.htm

MY024runner

I use 87 all the time

EDGE

I switched back to 87, seems with 93 I was just using more and 87 it runs just as good

03TundraTRD

I use 91 @$2.00 per gallon. And can my truck advance timing for 110+ octane. The 76 sation on Guam has this for $50.00 for 5 gallons.

Ray Smith

I run mid-grade 89. If I run 87 I get some pinging under moderate throttle. It's been this way since new. I try to run Chevron whenever I can because of the additive package.

Ray

OneTrickToy

87, and I avoid ARCO like the plague. I use either unbranded, 76, or Chevron. I prefer unbranded. It doesn't have any additives, so you are getting the purest gasoline. If there isn't any unbranded, then I go with the other two. Their additives seem to be the best. I avoid ARCO because of what they put in their gas. Ethanol, and lots of other "filler" that isn't good for your engine. When I had my older truck I could really tell the difference. Just because I can't tell the difference with my Toy doesn't mean that there isn't any. I figure I'm taking preventative maintainance by avoiding ARCO.

Albuquerque Jim

91 is the highest we have here, to avoid pinging I am experimenting with Toluene, so far so good, I have run 2 tanks though and it runs better than ever. My mileage did drop though.

1 gal of Toluene (114) with 14 gal of (91) = about 92.5

JC_ez

I use 87. 4Runner engines are designed to use 87 octane. Only higher compression engines use higher octane fuel to stop it from prematurely firing. Higher octane is harder to 'combust', so it is useful in high compression engines only. If you use it in 4Runners, you will notice a loss in power and fuel economy because the compression ratio is relatively low compared cars that recomment high octane fuel (4runner is 9.8 while some cars go up to 11 or more). Putting high octane fuel in the 4Runner means that the fuel may not fully combust properly which would leave deposits in the cylinder. If your 4Runner pings while using 87, then putting in a higher octane gas would only be a temporary solution.....it really means that something is wrong with the engine. This info that i'm posting is for non-SCed runners.

SC'ed runners 'push' more fuel mixture into the cylinder so that there are higher pressures in the cylinder. Higher octane fuel is probably recommended for them, but I am not sure.

Fink

I use 89 in my rig...seems to get a little bit better mileage.

I may end up just going with 87 though...see how that does for a while.

Fink

KING

I use 87 and it seem to work fine for me.

Its been a while since I've used the mid-grade stuff. Perhaps I'll try some of that stuff next fuel stop and maybe get even better mileage from what I'm getting now

I've never used the PREMIUM stuff, wonder how that works, if there is any difference.

keisur

Me being chemically brain-dead, what does Toluene(114) do for the system?

waskillywabbit

iTrader: (-1)

It is already found in crude oil products. You can do a Google and get tons of info on it. If there was some "magic bullet" out there for improving the performance like Toluene (114) for significantly improving engine performance and efficiency you and I wouldn't be able to afford it. Like I've said before, anything that will significantly improve the performance and efficiency of your engine, like lead in gasoline, would never pass EPA standards or would probably be cost prohibitive.

EDIT: Higher octane fuel is only necessary in higher performance engines that need a higher air to fuel ratio to perform at peak efficiency and approaching the unobtainable complete combustion level. It does not matter how much more octane you add to the fuel mixture if it is not in proper ratio to the air it still will not combust properly.

4runner4ever

91, 95 and 98 in Holland and Belgium. And that are the actual octane numbers, so....I guess we drive faster?

keisur

screw it, I'm to lazy to search and read. hehe. oh, I DO notice when I use 87 I knock and when I use 92 or 93 it doesn't knock.

waskillywabbit

iTrader: (-1)

The knocking could be due to: differences in quality of gasoline, differences in brands of gasoline, it's all in your head - it could be any number of things as to why that happens. I still think paying for higher octane without a modified high-performance engine that really needs it is horse puckey. Thermochemisty dude, thermochemistry!

keisur

didn't take thermochemistry, wasn't required, you know that! Mine is modified for high performance, I did the intake silencer mod and can smoke any viper or corvette as long as their engine isn't on!

waskillywabbit

iTrader: (-1)

Aren't you an ME? Basic thermochemistry is taught in Thermodynamics I and II.

keisur

I took thermos I and II back in 94. I haven't dealt much with thermo since then, so I blocked schreiber and midkiff's lecture out, maybe I'll review a little. I actually took Thermo II through that video taped summer class program. it was midkiff's class. Stress analysis was my bag, not chemistry and thermo.

I remember how to make a calorimeter though, hehe, a styrofoam coffee cup and a lid.

Albuquerque Jim

I completely agree. So with a S/Ced engine it makes a hell of a difference especially since we can only get 91 octane at the pumps and some places only 90