Mr Pants!

Can anyone advise, what will happen if you put normal unleaded in an STi?

davedipster

Super unleaded is fastest, normal unleaded abit slower but still ok and diesel the slowest of all

Dipster

davedipster

I used sainsburys super (79p here) in my stiPPP last week and drives the same as optimax (85p) using my butt dyno.

Dipster

smiff99

If It's a classic then def no, unless of course It's been mapped to run on it.

Jamo

iTrader: (23)

it will run like a bag o' ****e and you will presumably get loads of det, and maybe engine failure? is it a uk car or jdm? if its jdm i know you are meant to use the super version, if you are using normal unleaded get a fuel addative to add to increase the ron in the fuel.

hth

jamo

kbsub

Taken from Prodrive brochure on STI Prodrive performance pack

Mr Pants!

Its an MY03 Sti type UK.

The acceleration is not 100% smooth all the time. The turbo kicks in nicely, then there is an extremely slight hesitation around the 5500rpm area, only very slight though and not every time I accelerate.

I only brought the car yesterday and there was 1/2 a tank of fuel in there. I have put in Optimax, but I wondered if perhaps it had normal unleaded in before and this may be the problem.

Or are these cars not perfectly smooth through the rev range all the time?

davedipster

If you want smoother and faster then super is the way to go, any make will do imho.

Dipster

SirFozzalot

Take a look in the manual. It says something along the lines of "Use 98 RON unleaded gasoline - 95 RON can be used but not to optimum performance"

GrollySTI

Yeah - I always thought 95 was safe just not the best performing.

On a UK car of course.

Mr Pants!

Thanks guys, I will give it a couple of tank fulls and see if it clears up.

It seems to be getting less and less hesitant the more I drive it