scoobyfrankie

Whats wrong with this petrol my car won't full rev its jerky and feels like it's running on three?

kingofturds

iTrader: (1)

Fine here sure your not missing

scoobyverysoon

iTrader: (1)

only tried it once as I was running low on fuel on the way to Germany it seemed ok

RB5_245

My car never got on with it either.. That and Esso 97 just didn't seem to do the job

Russellg911

A few people have reported their cars as not running as well on BP Ultimate and from my experience it has made my car feel rough and held back....it's either that or coincendental to my car's general running.

I use Tesco 99 whenever possible and again, it could be coincidence but the throttle respone feels crisper, the engine smoother and more rev happy.

scoobyfrankie

tesco was the same, car was holding back, car is a 95 jdm wrx ra

deanwoodward

ive just filled with bp for the first time usually tesco and my car feels like its running rough aswsell

AudiLover

This is one of the scoobies weak points.

PaulC72

My car does not like BP ultimate either

Alan MaC

If I have to use Ultimate, I put in Millars Octane Booster first.

Runs OK.

Without the Booster, it seems to hesitate then, goes OK.

Shell V Power, Tesco 99, Waitrose Super, Esso Super all good.

Question??

Has anyone noticed that tons of Shell Garages are now becoming BP'S???


Alan MaC

sarnyboy

im no expert but i would of thought if you normally use one type of fuel and then switch to another it would be best to reset ecu quickly so it knows to re-adjust things accordingly..

just an idea??

Alan MaC

Doesn't the ECU adjust itself & reset after a few miles on different fuel??

Russellg911

It does. Although I recall a thread about some guy saying that his PPP'd STi was feeling held back at higher revs and was perhaps related to fuel choice. Mike Woods (Prodrive) replied in the same thread and explained that if the ECU had detected an issue in it's learnt table then the best way to re-adjust it was to reset the ECU via battery disconnect. The understanding was that because most of the time cars aren't driven at high revs, it will take a while for the ECU to readjust within that range.

Alan MaC

Nice one Russell G.

Learnt something tonight>


KInd

regards

Alan MaC

F1 CJE UK

iTrader: (8)

in germany its 100 Octane not the 97 we get

Bob Rawle

BP Ultimate in the UK is the worst fuel you can use in the Impreza, V-Power or tesco 99 is the best, any other SUL is "ok", talking about UK versions here.

Ultimate is dire on any modified car

Bob

Russellg911

What does it actually do Bob and what symptoms are caused as a result?

Alan MaC

Question for Bob Rawle.

Bob you never actually explained why you feel BP Ultimate is not good & what i does?

Thanks.


Kind regards

Alan MaC

Jimpreza

My tseso's super is only 97 ron. Is this ok to use

New_scooby_04

iTrader: (4)

If it's a UK car that hasn't specifically been mapped for higher RON then it should be fine mate.

V power is definately the way to go if you can get hold of it though.

Ns04

D1CCY

Pat Herbourn reckons its to do with the way the fuel atomises. In his opinion V-Power is the best at this and Ultimate not very good. Before I had my 03STiPPP remapped I'd occasionally use Ultimate, it ran a bit lumpy but the fuel consumption was noticeably improved?. Only use V-Power now.

leef44

Is this only an issue if you have your car remapped?

Is this an issue for MY05 STi PPP? Or should BP Ultimate make no difference?

scottish_jim

I love the smell of V-Power in the mornings.

In the 2 and a bit years I've had my car it's always used Optimax then V-Power. The label inside the petrol flap says 98 RON so nothing else will do. I've used BP twice, both occassions was only a tenners worth to get me to a shell station.

D1CCY

Leef

Ultimate should be OK in a PPP car, Prodrive quote "continue use of 97 RON for best results". It won't do any damage but V-Power is just a lot better and usually cheaper. If a car is remapped for V-Power (99RON) then it it would be defeating the object to put in anything less, although the ECU should compensate. I keep some Millers OB in my boot if I have to put in any 97.

Cheers, Diccy.

New_scooby_04

iTrader: (4)

Depends what you mean by issue: You have PPP, it needs SUL, BP ultimate is SUL.

BUT

Common concensus appears to be that Scoobies don't run as well on BP Ultimate. Mappers certainly don't seem to rate it. Give V power and Tescos 99RON a go and see if you notice a difference.

Ns04

scubasteve

from what im told the classics dont like it too much but my newage seems fine running ultimate.(No shell supplier near me )

jbl

Had my import 1998 Forester T/tb auto for 5 yrs now, most of the time it runs on Ultimate ( no Shell near ) and has been fine, no problems at all.
Perhaps the auto is easier on the engine ? !

Brian

philc

my understanding is that the car adjusts to run on the lowest grade fuel put in it. the only way to take advantage of a higher octane fuel is to do an ecu re-set (disconnect the battery for 20 mins). The car then re-sets to the fuel in it at the time.

And I always run on BP 98 (new age sti with ecutek tune) - except for track work when I use 100 octane avgas (and do a re-set before using it on the track) - and the car has been de-catted.

New_scooby_04

iTrader: (4)

For info, look at Bob's response to this thread.

https://www.scoobynet.com/scoobynet-...bob-rawle.html

For anyone who doesn't know, Bob is a VERY highly respected mapper. His comments reflect what has SEEN the ECU doing on cars with different fuels, and are not just a subjective "seems to go better on that gov!"

Ns04