Sorry for a relatively nubby question. But what kind of fuel do you guys use on your fd's? I have a completely stock r1 with a downpipe coming it. I have been filling it with 89, but have been scared about detonation lately. I haven't bought any gauges, but the 3 I am looking at are the boost, water temp, and air fuel (or Exhaust gas temp gauge) All from Defi. What do you guys think about the fuel I use, and the gauges I want to install? Thanks a lot !

 

the highest octane you can get. 91.

 

Do you use 91? and its not the HIGHEST, only highest for gas pumps ;D

 

I use 91 b/c that's the highest pump gas I can get and I'm not trying to run to a race track everytime I need to fill up - plus if you tune your car later you'll not want it to self-destruct should you find yourself on empty w/ no "higher octane" available.

Highest octane at the pump for any turbo/supercharged cars.

 

i use 100 octane only

 

^ yes but in Europe it is rated in RON. In the US it is rated in RON + MON/2 , also known as the Anti Knock Index, which will be lower. 100 RON is closer to 94-95 AKI . Probably the most common gas in the US is 93 AKI which is closer to the 98 RON available in Europe. 91 Octane in the US is more like 95 RON in Europe.

http://en.wikipedia.org/wiki/Octane_rating

 

ah good to know. well its the highest i can get here

 

I believe Mazda specifies 91 octane in the owner's manual, BTW.

There's also a sticker on the gas door that says "premium unleaded fuel only". Midgrade ain't premium.

Dale

 

Actually, it says "premium fuel recommended". At least mine says that.

 

I went out to check mine and there isn't one on the gas door someone stole my sticker!

 

I thought mazda specified 93 octane in the fd. Well I always drive the extra couple blocks to get 93. There is a gas station 3 blocks from my house that sells 100 octane also. Is it safe to run that on my mostly stock car? I have chosen not to risk it thus far.

 

I remember something in the owner's manual or supplements that said to use either 91 or 93 octane and that, in the event lower octane fuel HAD to be used, to expect diminished engine performance.

Too lazy right now to go find that little gem....

My Volvo is a twin-turbo six and it simply says, 'Premium fuel required'.

 

Alright guys, thanks for info. Gonna start with 91! How are the gauges? do you think I shuold get EGT temp or the air/fuel ratio

 

If you get an air/fuel gauge make sure it's wideband other wise it's not worth it. If you go EGT make sure the sensors are picking up temps before the turbos otherwise you are not getting a proper reading.

I would get a better water temp gauge so you can acutally see what temps you are running.

 

man thats something i been thinking lately, we have 89-91-93... does anyone really use 91.. i normally see people getting 89 for 93, never the inbetween one...

 

Yea, I am saving for boost gauge, water temp, and probably the exhaust gas temperature like you guys say.

 

91 is all we have here in CA

 

I used to run 94 with 15% ethanol from husky, because I was stuck on the higher octane the better thing. Then I switched to 91 octane with no ethanol from shell, and it was 100x better, I noticed immediately after I left the gas station how much better my car ran, and it even felt peppier.

 

i used premium mix with oil

 

for sure get the boost gauge, the water temp gauge is good, but hard to install yourself if you don't know how to remove and install the water pump and have a drill an 1/4 nbt tap, but thats pretty easy on the first and second gens, IDK about the FD though. I've only seen under the hood of a few, and never really paid much attention to the water pump.

I wouldn't worry about a wide band until you have a few more mods. and a afc and some engine management. those wide bands are like $175 and up, then you need second O2 bung welded in.

 

I am not so sure on the term wide band? Does that just mean lower and higher possible temperatures? And could the boost gauge, if read correctly, also determine air/fuel ratio?

 

If your wanting suggestions......search for info on the term 'AI' or "Auxillary Injection". With that, it probably wouldn't matter if it's 89 or 91 RON.

 

Always the best available imo... shell v-power 99 is the best we can get at the pumps in the UK.

 

Nice fd on your avatar ceylon. I think chevron 91 is the best kick for my rx7. At least thats what i FEEL

 

Its CraftCompany's track FD...Although in three weeks mine will look virtually identical