JasonVette

Right now I'm pushing 930/750 to the wheels on the stock bottom end. For fuel I'm using pump 93 + meth. The only reason I'm not on ethanol is because my tuner said the best blend I could probably do is E30 and it would be a hassle to mix all the time. Twice now I've had people tell me, not professional tuners mind you, that running 93 at my power level will blow my motor.

Is there any truth to this? Why would that be or why would they believe that?

NortonCO

Higher power generally means more aggressive timing/tuning, which usually comes with higher octane requirements. Your tuner (should have) tuned your car for the fuel he/she recommends. I'd follow his/her advice ahead of anyone else's.

99vetteran

So I would think that's pretty high hp for 93 octane. I would consider going with a alternate fueling system so you can run E85. You won't find full E85 at that many stations in the midwest. Most are E65 to maybe E75, at least thats all I can find in my surrounding area. Mike from toohighpsi has a port injection for you to purchase and that way you can run fuel that will be best for your HP. I ran Meth with my 16 Camaro with race fuel and we made an easy 870 but we were seeing low side fuel pressure drops going thru the traps and on the dyno so we stopped there.

C5-VERT

You should have your tuner pull timing based on the flex fuel percentage. I can run 93 or full E85 but also running Holley Port and a full secondary fuel system. Fully built 416 @ 25psi on an F1A-94 and stage 3 cam. But you can run 93 it's just a matter of tuning for it.

99vetteran

Agree, mine adds timing with E85 and runs regular base timing with 93. Fine line for sure.

Maxpowers

Check what the car has been tuned for.

MCK_Z06

I'm assuming your tuner is relying on the octane available in the meth to makeup for the lack of fueling capability.
In that scenario you are probably fine on 93 w/meth as long as you don't run out of meth or have a component failure in your meth kit. (and it was tuned correctly)
930whp does not sound too crazy for a H/C/I fbo +meth +2650 car as long as you tuner backed everything off a bit during tuning when they started seeing knock or fueling issues.

Even though I have secondary port injection I'm still octane limited on 93 to a little over 800whp on a 2300 setup at 14psi.
Filling up with full E85 or C85 safely gets me 50-60whp more through more aggressive timing and cooler operating internal temps just through ethanol's increased resistance to knock/detonation. (octane + valve, cylinder and overall engine cooling effects.)

If I went to a larger blower like a 2650 I would expect to safely extract more power on 93 and ethanol without changing anything else (maybe DI or PI injectors) except the tune since I already have the excess fueling capacity.
This is because the 2650 is more efficient and runs cooler which keeps detonation at bay and allows for more power given the same available octane.

There are many variables such as the size and efficiency of the blower, temperatures, altitude, other mods that alter AFR, more efficient FI delivery systems (turbos), etc. etc. that determines what is "safe".
That's why you always see variations in power in cars with the same setups from car-to-car, location-to-location, different environmental factors, fuel available.......

Internets_Ninja

Meth + 93 is not going to blow your motor. E30 + Meth would still be better though and pick up a little bit of power. But the Meth will increase the octane and add cooling which is its purpose anyhow. I imagine you're spraying quite a bit of meth at that level. What size nozzles are you spraying with?

Avanti

And, it depends on what you actually do with the car, apart from whatever power it produces. You run it hard, it ups the risk. You run it hard longer, it ups the risk. All the best.

JasonVette

Understood. This is what I understood initially, but didn't know if there was some element of 93 that made it more prone to cause damage.

Dual nozzle 15s I believe.

Walter Raulerson

That's all I use in my Z51

robert miller

Those people dont know what they are talking about at all ok. It all person is in the tune I dont know all the other parts you have on the motor to get that.,, But if your tuner did a good safe tune & using the meth for per say to just cool down your IAT your motor will hold up good per say for you. Robert

ZZ06

Those who are telling you such things do not understand timing and the effects of meth. Listen to the one who tuned your car.