why do people keep saying different things as to what octane gasoline you should use in the car (for the record, i am talking about the turbo engine). Some people say 87, some say 93, wtf.

I have never heard a sane person suggest anything but premium gas in the turbo. I would never run anything less than 93.



Detonation in a turbo under boost will likely destroy your engine. Higher octane gasolines are less prone to detonate. End of story.

thats what i keep telling other people but they always say "no use 87, its in the TII owners manual, blah blah yadda."

[quote name='drftk1d' date='Apr 13 2005, 05:27 AM']thats what i keep telling other people but they always say "no use 87, its in the TII owners manual, blah blah yadda."


[/quote]



you can use 87 in a STOCK turbo 2, but its still not a great idea

Yeah, I had to run out to the car and check the manual. It does say "at least 87 octane" or something like that. Remember, that's for a new car with all systems in new condition.



For me, it's a simple matter of risk versus reward. The risk is a blown engine. The reward is saving 15 cents a gallon. You decide. If you daily drive the car and don't dog it, you'll probably be fine.



On a side note, my DD is a Volvo 940 Turbo. I usually run regular. Volvo "recommends" premium. I goosed it a little getting onto the interstate last night, and she started rattling pretty good. Guess I better start running midgrade. https://www.nopistons.com/forums/pub...1047683664.gif

If it's not detonating, you're ok - I'm pretty sure they all have the same calorific value - don't know where I heard that though.



Mark

In general you should run the lowest octane that keeps you from pinging. If you have no detonation with 87 then run 87 anything more will cause excess carbon buildup. I run 87 on my Ducati motorcycle and it runs great with it.

[quote name='Ghiadesigns' date='Apr 13 2005, 09:49 AM']In general you should run the lowest octane that keeps you from pinging. If you have no detonation with 87 then run 87 anything more will cause excess carbon buildup. I run 87 on my Ducati motorcycle and it runs great with it.


[/quote]



This is true, but I think it bears mentioning that while in a piston engine, you can get out of the throttle when you hear pinging and not do any damage, often with a turbo rotary, the damage is already done.

my dads hemi dodge ram requires premium... go figure.



for a turbo anything, I wouldn't run anything less than 91.

93 or higher ooooonly... why risk it??? 10 cents a gallon or whatever youre going to risk your motor?? naaaah

I run 87 octane in my '90 TII. It's completely stock, and I've never had a problem. However, I run 93 octane in my '87 TII, but I'm pushing more boost on a ported motor in that car.

the higher the octane rating of the fuel the more efficient and complete the burn is resulting in less carbon build up not more!!

Any boosted or high rpm engine might run good on low octane but it runs its best at what it needs if you care about your car or bike run what factory says theres a reason for it and please stop necro posting

He's increasing his post count and digging up old good info. No harm no foul, he's fine

Yea true but then you could just arcive or sticky them with a lock

Water injection systems are a proven World War II Supercharged airplane technology that will let you run sick boost on 87. The water mist keeps internal cooled down and eliminates preignition detonation. I read an article on a WRX making a safe 500hp on regular gas.

Re: The Gas Debate
 

+1 for water injection, or 50/50 methanol/water injection.

Its a tried and true method. It decreases intake and combustion temps and helps combat carbon buildup. Decreased chance of detonation and a cleaner motor = win. You can buy a basic pressure activated kit for around $250-$300.

Re: The Gas Debate
 

Out of curiosity anyone on here running E85 on their Turbo 2?
Not looking to start a debate of gas vs ethanol. Just wondering if anyone is running it.