Had the PPP fitted 2 weeks ago. As you all know, increased performance fairly dependent on SUL. Performance when fitted significant improvement. Filled with optimax, then performance slowly degraded over 3/4 days. Filled with BP super after that and hey presto - performance back.

I know the optimax debate has been done to death, but have any of you guys who have mods that depend partly on SUL for the full advantage experienced this?

Views appreciated

Thanks

Matt

 

It's very variable.
Try a garage with a high Optimax turnover (however you might be able to work that one out...) - it degrades over time. If you can find a good garage, just stick with it.
If that doesn't work, Esso seems to do the 'best' SUL.

 

Thanks nom

Just spoke to a technical guy at my local dealer who said exactly the same thing. I did get the fuel from a small garage, so looks like your both right.

Cheers

Matt

 

I'm sure it does depend on the garage's turnover of fuel.... but

Another common trend that I've noticed from peeps responses to this on scoobynet, seems to be that alot of UK cars don't run as well on Optimax as Jap imports seem to.

My UK my99 runs rough and stuttery on optipish, then when you switch back to SUL it immediately feels more urgent and smoother

Who knows

PS Local Subaru dealer advised against optimax as well

 

My MY99 loves the stuff

Weird!

 

thats because imports are designed to run on 100RON fuel & UK cars are not - so you would expect imports to like the higher grade stuff.

Ro.

 

How are you measuring the decreases in performance? You've probably got some elctronic trickery?

Not meaning to sound glib but I always think my car runs better when I've given it a wash and wax and clean out the inside (feels like new again).

I can see that it may be worth getting the Optimax from a larger garage that shifts a lot but on the whole I can't see that it can make much difference shifting from one make to another?

That said I have a preference to fill up with Optimax and can only tell a difference if I have to fill up with std. unleaded (second choice is BP SUL).

 

I use the london road shell garage (By BBC Nottingham) MY00 UK spec. De-Cat, Dawes, Itg blah, blah! Used it for about 30,000 miles now and all is well

I have had to use SUL and even NUL every now and again and to be honest, it's all a little bit PLACEBO to me i think. I do notice that the car flames alot more AFTER a tank of SUL but apart from that all is well.

I use Optimax more for it's supposed cleaning properties rather than performance gains and it's a nats cheaper than SUL

Mikey

 

I can't accurately measure the drop off, BUt when the power came back after a tank of BP super, it did so quickly, so I know I hadn't imagined it. I haven't experienced many problems with optimax before though.

Garage was London road island Gridlock Mickey, but its the cheapest in town (I think)

 

Gridlock Mikey (or anyone else):
How do you make your car flame?
The only mods i have so far is: VTA DV, Blitz SUS air filter (and use Esso SUL)? Planning to buy a decat' exhaust system soon...
cheerz...

 

MistaCain, YHM, Let me know what you think, feel free to post it on here if you wish

Mikey