xr-stu

...whats peoples opinions on using a secondary adjustable fuel pressure regulator in conjuntion with a higher pressure pump to add more fuel in a low boost supercharger setup? i cant stretch to aftermarket management and know of a guy whos supercharged a rover vvc and uses this method with no problems. its used HARD on track regularly too. yes fueling may not be spot on and it may run slightly rich or lean at certain points. but it should be 'safe' enough right? it would be an m45 supercharger running a ballpark of 6 or 7 psi on a puma 1.7 engine. aiming for a cheap 170-180bhp with a few other bolt on mods.

i know it isnt ideal but would like to hear what people think of doing it this way. anyone here done similar before?

Jay,

iTrader: (4)

The only thing that springs to mind is det , as maybe the fueling might there about but how you going to stop det

m4tt274

iTrader: (2)

I once saw a cossy 24v running slightly bigger injectors, think they were 240ccm over the standard 180s (this was a long time ago) and a 6psi supercharger setup.
It ran rich off boost and lean on boost from what i recall him saying, but it worked and made about 280bhp.

xr-stu

After a bit more research its pretty common on low boost mx5 turbo conversions, the greddy kit comes like that. Although det may be the issue. At least on te mx5 the timing can be adjusted but its not quite that easy on a puma obviously. I wonder if low boost with plenty of fueling and super unleaded it'd be ok. Suck it and see I suppose?

xr2wishy

iTrader: (2)

hee-har for sure, if you wnt to get it somewhere to fuel more on boost, just fit a fse one with a 1.7:1 rising rate as opposed to everyone elses 1:1.
you hit boost and you'll get 70% more pressure down the injectors throat, far from ideal as injection does like to have the correct parameters or could throw a fit depending on ecu's.

maybe fit aftermarket management, you will save a lot on fuel quite quickly and get the most out of the engine, it's then easy to upgrade in the future.
if you don;t get fuelling right, you either melt the engine or waste fuel and lose power, can't see why you wouldn't do it right, you could always fit a carb and just need to piss around with jetting then.

xr-stu

yeah i know the ideal way of doing things is to fit an ecu, but to be completely honest i dont really want to invest too much in the car, although i know something like that id be able to sell on in the future. having seen/heard first hand the pikey method working, its just tempted me to give it a go too before i take the plunge on the management.

shalon

could you not use fiesta turbo management

xr2wishy

iTrader: (2)

so you want to try a rough method of fuel delivery before getting management sorted?
seriously don't bother, the fuel saving alone and extra power of a properly setup engine will save money quite quickly.
in this day and age it's so cheap to sort out proper fuelling.

but if you must, just do as i suggested in fse fuel reg 1.7:1 rate.

having cracked a piston due to a few seconds of running lean is all the evidence i needed to do it right, cost a lot to fix the problem alone, very similar to doing it right first time.