89' 3.3L 10.6:1 dyno

[AREA 91]

87 octane in a stock SHO is a no no. With higher compression, higher octaine is needed. The knock sensor will pull timing out at a large rate resulting in lower than expected power. Filler the SHO up with 92-94 octaine and watch the knock/timing events.

 

[Yamaha V6]

Actually, I run 87 when it's cold all the time. If your ambients / intake temps are hot, you might run into a problem. IIRC, the dyno graph I posted was not on premium, FWIW. Might have been a blended tank. I'll double check the numbers. High compression will want to make better use of anti-knock agents / high-test gas. Remember also that although Ethanol is lower in BTUs, it resists detonation better than straight gas too.

 

[yamahaSHO]

In my stock SHO, I ran 85 most of the time. I am at higher altitude, so higher octane wasn't needed. On a warm day, I noticed some pinging and then I switched to 87. Use the lowest octane required to prevent knock and you're golden.

 

[SuperchargedSHOguy]

87 octane in a stock SHO is a no no.

Actually, I ran 87 octane in all my SHOs less the supercharged 91.

Dude, just shut up. Seriously.

hahahahahahahahahaha!!!!!!!!!! lol

 

[SHOtime2511]

ive ran my best time aat the track on 87,in July no less.

 

[Shopower400]

In my stock SHO, I ran 85 most of the time. I am at higher altitude, so higher octane wasn't needed. On a warm day, I noticed some pinging and then I switched to 87. Use the lowest octane required to prevent knock and you're golden.

Definatly good info!! As far as jet fuel is concenred, i've been dealing w/ it for the last 4 years, and it is a "highly glorified" diesel/ karosene mixture.
Putting that in your car would ruin your engine. However it may work quite well in a turbo diesel!(If you can get a hold of it!)

 

[adidas_kn]

Well Maybe I will run some 93+ in it and redyno. It seems to run fine on 87 and 89 octane gas. I'm only running it right now due to how much we're using for this long ass road trip from Norfolk, VA down to Florida then over to Houston. Maybe I can stop by and see Powersurge here in Florida and run some higher octane gas and redyno it after I put an ACCEL coil pack and some new wires on it. I'll run the codes to see if it has any hidden codes.

 

[illSHOyou]

I would think its a fuel problem. It could be a knocking issue but that is really hard to tell. First it already seems like the fuel mixture is lean + the engine is running at a higher compression. A richer mixture could probably limit detotanation and make more power. Lean muxture is probably just making the problem worse, and causing the high compression to get alot of attention when it might be fine if the fuel is there. If your not burning as much fuel as you could be then your wasting power. If anything its free hp!

I would believe that somebody that spent $300.00 dollars on dyno time vs. somebody with $1,500.00 of mods and no dyno time would be better off than the person with a S&#T load of mods. Air/Fuel is so critcal in my opinion!
Wouldn't be ashame if your engine wasn't getting to its full potential becuase simple it wasn't getting feed enough fuel...?

 

[bubba]

Hey adidas_kn did you just bore your block or just piston's? To get a 3.3l.

 

[SHOtime2511]

I would think its a fuel problem. It could be a knocking issue but that is really hard to tell. First it already seems like the fuel mixture is lean + the engine is running at a higher compression. A richer mixture could probably limit detotanation and make more power. Lean muxture is probably just making the problem worse, and causing the high compression to get alot of attention when it might be fine if the fuel is there. If your not burning as much fuel as you could be then your wasting power. If anything its free hp!

I would believe that somebody that spent $300.00 dollars on dyno time vs. somebody with $1,500.00 of mods and no dyno time would be better off than the person with a S&#T load of mods. Air/Fuel is so critcal in my opinion!
Wouldn't be ashame if your engine wasn't getting to its full potential becuase simple it wasn't getting feed enough fuel...?

do you really have an electric supercharger?

 

[adidas_kn]

Well I'll try to check fuel rail pressure soon. But I'm going to start running 93+ octane from now on and upgrade ignition components. We'll see if it makes a difference. I def don't hear any detonation but I can run the codes to see if code 25 comes up and stays there. I don't think there are any intake side restrictions or even that big exhaust restrictions. The y-pipe is brand new and doesn't have any kinks but Doug said it was too small diameter and not high flow cats. I PM'd Powersurge soo we'll see what we can do.

 

[adidas_kn]

Hey adidas_kn did you just bore your block or just piston's? To get a 3.3l.

3.3L was achieved with a slight overbore on a 3.2L block with Wiseco 3.3L pistons.

 

[bubba]

thanks. Just wanted to know.
That looks like a good tq curve.

 

[SuperchargedSHOguy]

Definatly good info!! As far as jet fuel is concenred, i've been dealing w/ it for the last 4 years, and it is a "highly glorified" diesel/ karosene mixture.
Putting that in your car would ruin your engine. However it may work quite well in a turbo diesel!(If you can get a hold of it!)

Let me go ahead and explain the 2 types of fuel we are talking about for future reference:
I've been running avgas (avation fuel) in cars for the last 7 years and have never had a problem... It is deigned to be used in many planes and race cars and most people can purchase it if there is a small airport around. You will burn up your O2 sensors faster as with any kind of race fuel. I believe all that is left is a 100/130 which is about 100 octane in gasoline stardards. The price is about half of what you would pay for 100 octane at a track or gas station that pumps it. This fuel is leaded.

You are thinking of the diesel fuel that is used in actual "jet" turbine engines- that you could put into a diesel engine only because it is your glorified karosene/diesel mixture. Two totally different fuels. Luckily this fuel is harder to get ahold of and that is a good thing because unknowing people would probably try to put this in their gasoline powered cars only to find them not run at all.

 

[Shopower400]

I see where you're coming from now. You meant the fuel you were using was a souped up type of avgas @ 100+ octane that you could find at a small airport, with smaller/propeller type aircraft. The stuff I though you were refering to was the "real jet fuel" also known as JP-8, that goes into a turbine engine as you stated. You've deffinatly clarifired yourself in my book! You get a big Peace

 

[SuperchargedSHOguy]

I see where you're coming from now. You meant the fuel you were using was a souped up type of avgas @ 100+ octane that you could find at a small airport, with smaller/propeller type aircraft. The stuff I though you were refering to was the "real jet fuel" also known as JP-8, that goes into a turbine engine as you stated. You've deffinatly clarifired yourself in my book! You get a big Peace

Yessir. I figured it was a good time to explain both types of fuel incase someone did get ahold of the "real jet fuel" and tried to run it.

 

[SuperHO]

I'm only running it right now due to how much we're using for this long ass road trip from Norfolk, VA down to Florida then over to Houston.

FWIW, the $.30 price difference between regular and premium equates to about $5.40 on a tank of gas difference....it's worth that extra $5 to get the good stuff.....

 

[Shopower400]

FWIW, the $.30 price difference between regular and premium equates to about $5.40 on a tank of gas difference....it's worth that extra $5 to get the good stuff.....

Well Said. Also a big :thankyou: to Superchargred!!!

 

[illSHOyou]

do you really have an electric supercharger?

Why do you ask?

 

[thecrew2999]

i olny run and olny ever ran high test.. no less the 92 rating.. mainly because i always got bad fuel milage and the car just didnt feel like it did with the good stuff.. in theory i dont think it should make a difference because the car can adjust timing but thats just how my luck it..

not to mention the cheap fuel also seems to be much more of a crap fuel like dirty wise. you kinda get what you pay for... trust me your valves will thank you later then they can shut without forcing carbon into the valve rings and making a crap load of pits...
also remember when you pit the valve rings or landings whatever you wanna call them, you begin to lose compression as time passes... so i say go ahead guys run crap fuel