Rotary_7

What kind of gas do u guys add??? 87?? 89??? 91??? higher??? lower???

I drive a S5 NA, and im not sure wat kind of gas to add, the FAQ said 87 is best, but some other people said itll die faster, and sum told me it was better, so im here all confused...please help me out???

ddub

87, if you're n/a you need nothing higher.

Kenteth

On my modified n/a I'll throw in the lowest octane I can plus a bottle of premix. In south dakota, the low/standard grade is 85 avg oct. i did see 83oct once, and was considering trying it just to see how it would do, but didn't need any gas at the time. Can't remember where that was though.

N/a's don't need anything great. Basicaly low octane = better power and mpg on an n/a. Same doesn't hold true for an charged engine, but n/as love low octane fuel

EDIT:
and if by "die faster" you mean the engine will blow apart, those peeps are wrong. They are thinkig that higher octane is so much better, but its not true for n/a cars. However, on a turbocharged/supercharged engine, the fuel needs HIGHER octane to keep from detonating before the spark.

Basicaly the lower octane mans fuel burners and combusts easier, great for an n/a.

The higher the octane, the harder it is for the fuel to burn and combust, good for protecting a turbocharged engine.

For a turbo, compressed air + low octane fuel (burns easier) will combust before it ever gets the spark of the sparkplug. This is detonation. This is bad. This kills engines.

However, a turbo engine: compressed air + high octane fuel (harder to ignite) will not spontantiously combust, and will hold true until it hits the spark from the sparkplug, to which it combusts like it shoud.

Detonation (caused by low octane in a turbo'd engine, or just stupid tuning) is bad for the engine. How bad? Ping ping, blown engine bad. So yeah... they are right, it will cause it to "die faster", but only in turbo/supercharged engines.

Rotary_7

what does premix do ???

Kenteth

Do a search. It lubricates the apex seals. The engine stock has means to do this from the factory. Premixing is a way to make sure the seals are lubricated (incase the stock method -- OMP fails) or for guys like me who have removed/disabled the original lubrication system because it gets in our way.

Sot he advantage of premix? You know stuff is getting lubed.

The disadvantage? EVERY fill up, you *MUST* add the correct amount of premix, RELIGIOUSLY. A couple missed tanks, and your engine starts to lose compression and power... another tank or two and pop goes the wankle.

inflatablepets

87 in a N/a is the best. Ity burns the fastest. Don't waste the money on premium. yopu will not benifit from it.

MidnightOwl

My friend burns 93 in his 92 Prelude cuz he's a dumb@$$ and think his car is faster. He also has a 2 foot tall wing. Hooray for Honda!

BDoty311

Aren't you suppose to run 89 octane in the S5s?

Well anyways, I run 92 octane, which I can only get at BP here in Kansas City.

JKM

Take it from my experience..use as low an octane as you can. I kept putting in premium for the first 6 or so months before I found out you're not supposed to. It took a bit of injector cleaning to get my car back to normal from the unburned deposits that it had left.

alwayssideways

to beat a dead horse some more .. its a giant waste of money .. especially where i live. to put anything other than 87 in on a NA . i burn gas like crazy(also doesnt help i drive very fast)

1989 GTUs

so on a S5 do i put in 87 too or 89?

sub9lulu

iTrader: (7)

87

d7n7master

Has anyone tried Marvel Mystery oil as a pre-mix??? Good, bad, ugly?
Thanks, Gary

Syonyk

MMO is apparently not bad to throw in every now and then, but it's not designed as a premixing oil for primary lubrication. Any decent 2-cycle oil will work (most people tend to go with the cheap Walmart stuff without any problems).

-=Russ=-

niburu

iTrader: (1)

I have a 90 S5 N/A, use 87
for the TII use the best you can find

bcool

Just bought 3 gal of the stuff a few days ago it sure the hell beats buying the $4 bottle of 2 cycle at the gas station every other time you fuel up.

Ragweed

So for my '87 GX (Non Turbo) which fuel would I preferrably use? My motor is a 7k13P; rebuit with less than 2000 km's on it.

(Please excuse me if the information above has already provided an answer. I'm not sure what N/A stands for; except "not applicable".)

ddub

How many times has it been said in this thread already!? N/A 87, TII higher. N/A stands for Naturally Aspirated.

Ragweed

Not knowing what N/A was referring too, I felt it prudent to double check. Thanks for clarifying that for me. Again, I appologize for my ignorance of most of the terms.
Also, the manual had suggested I used 91, which also prompted me to check with "those who know."

Oh, and to answer your question, it appears that it was said 6 times on this thread prior to me asking. I guess it was the seventh one that I needed to understand.

ddub

Your manual says you need 91?? What the hell...

Madrx7racer

can u PREMIX with ht eOMP still working? should I do it? this is on a tII motor with 18K miles

Ragweed

Yea....I was reading through it last night. I didn't even think they had 91 at all the stations in '87.

ddub

Yes you can. You will not need to run quite as much premix with the MOP still hooked up though.

ddub

Hmmm, that's really odd. Because I thought even the Turbo models were suggested (stock) to not use that high of octane, like they were said to use 89 or something.

Ragweed

hmmmm x2....Perhaps I misread or have my numbers mixed up. That wouldn't surprise me one bit. I'll have to double check when I get home, just for the fun of it.