BLKTOPTRVL

~3 gallons. So, filled the rest of the way with 93. I then turned off the Profec B and will just ride around at 7 pounds until I run all the gas out of the tank. No biggie.

But it did make me curious...

Anybody ever run the car for extended periods (with all else working properly) at 7 pounds of boost? Did you notice any performance/engine/mileage/etc... differences other than slightly lower power output?

Authentikdit

I DD my FD and run 7-8 psi everyday..When I first purchased my FD I knew absolutely nothing about it,so for the first 2 times I filled up,I filled up on 87 octance..Little did I know how dumb that was,but performance wise and mileage wise I don't notice much of a difference...

Mr rx-7 tt

iTrader: (5)

I had a buddy who used 87 octane for years until I told him to use 93...

mirabile

I wouldnt think you would notice all that much unless you boosted it up more.
However as he said ^ use 93...

GUITARJUNKIE28

i ran my fd on 87 octane for a few months with no trouble, but i used 8.5 CR rotors in my engine and a haltech e8. max boost was 11psi on a t66.

ArmitageGVR4

iTrader: (13)

I hate driving through NJ because on more than one occasion when I stop for gas and tell them to put in 93 I check the receipt and they actually put in 87. Sucks not being able to pump your own gas there. Now I watch them like a hawk to make sure they don't screw it up.

Football22

Up here in Alberta we only have 91octane at the majority of gas stations. Is 91 octane good enough?

goz

in japan they run 99oct in ireland we get 95 oct..i met this other guy over here and he said you have to change the management system and id have to go to england to get it done or wreck the engine.. i thought he was talkin ****, after readin these posts, its confurmed his stupitity

t-von

iTrader: (8)

An Fd at stock boost is perfectly fine with 87 octane. I've driven mine that way for the last 6 months with over 100k on the original engine. Increasing the boost is where you will start to have problems since the fuel burns faster.


Some of you guys need to understand what's going on inside your engines. All this paranoia when if comes to 87 is unneccessary. Our engines have 9.0 compression which is low. For the most part turbo charged engines are NA the majority of the time while your driving it. Really it's a waste to run a slower buring fuel when your just cruising/normal driving. The slower burning fuel will carbon up faster. Idealy you want the fastest buring fuel for your driving condition. That's why 87 is perfect for highway driving.

psquare8

94 fd-12 years with 87 octane - I splurge on 93 for some fun... Car runs fine just not as spirited with the lower octane...but it is mostly stock but a DP. I ran my FC only on 87 as it hated the higher octane.

BLKTOPTRVL

Thanks for all the responses...

But what I was asking was, does anyone notice anything about running the car on lower boost. As in:

If you have a aftermarket ECU, can you notice the engine running any cooler, with any noticeable inprovement of mileage, any less cooling requirements, etc. I imagine not, but I was curious.

kashent

This post doesn't make sense.

Why would the car run less spirited with lower octane? It's not like our cars have wonderful knock sensors that retard the timing- If his engine is knocking enough for that to happen, it's as good as blown, correct?

1 gallon of 87 octane gas actually has more energy than 1 gallon of 93 octane gas, so if it's not knocking, the parent post makes no sense.

rynberg

You guys running 87 are just silly.....the minimum recommended octane is 91. I guess if you drive around like grandma, it's ok.

bajaman

All we can get in these parts anymore is 91 octane, which I always use. If I could get 93 (which was available until just a year or so ago) I would use it. Hell, just for grins on occasion I'll put in a gallon or two of 100 octane race fuel when I want to really be 'safe' whilst getting on it in cool air conditions.
The problem with running 87 octane is that one 'oops' and you are done. There is no way the stock knock sensor is fast enough to retard the timing to keep detonation at bay.
I have on occasion run 87 octane in my twin-turbo Volvo S80 T6 and I notice a difference in performance. The ECU in that car is a work of art and monitors a lot more things more accurately than what the ECU in the FD can be expected to do, given the difference in years.

dubulup

this post makes no sense.

they have the same energy. 93 can handle more compression before it auto ignites.