I've just fitted my FMIC ,and i'd like to know how high i can safely set the boost to , i've got it running on 0.85 bar at the mo, and it feels great, although 1.0 bar it does feel a fair bit quicker!!
could i run 1.0 bar on the standard injectors safely or should i be looking at some 555's
this would in turn decide as to wether i fit a stage 1 or stage 2 chip
also can a standard healthy engine take 1.0 bar ok ??
I've been running 1 bar for about 4 years now on standard injectors, sometimes put it up to 1.1-1.2 bar if I need itNo problems to date
(touch wood)
Cheers,
Dave.
Obviously 12-13psi would be safer but if your engine is running ok then it should handle 15psi (take it you have a walbro fitted and colder plugs)
But there is no certain 100% answer, its only 'should'. You might be lucky or you could have an injector thats not flowing correctly and melt a piston
I think a lot of people run a bar on standard injectors without problems
i would look at 550's as your next engine mod though
Originally Posted by silverzx
I've been running 1 bar for about 4 years now on standard injectors, sometimes put it up to 1.1-1.2 bar if I need it
(touch wood)
Cheers,
Dave.
dave i notice on your spec sheet you have an adjustable FPR , would you recommend this then?
i was always under the impression that this would just push the injectors harder
Ideally you should have 555's but they are not needed.
I've done the last 50K mainly on 1.0Bar including trackdays.
I've run one bar for the last 4/5 months on standard injectors
ok , a bar it is then
the 555's can go a little further down the priority of mods then
I run 1 bar solid at all times - I was running 1.1 bar in spring when it was a bit cooler with no problems...
ive run a bar on both of mine (16psi for a bit on the old one - christ did it fly)
Having read lots of threads about maxing out injectors though ive turned it down to 0.8 for normal running... scramble boost is just over a bar though
0.9 to be safe, IMO it makes such ittle difference on a well set up cars it not worth the risk.
Go get it set up nicely somewhere like APT, my car rules after they fiddles with it.
1 bar is too much really but you may get away with it
If you took it somewhere to be set up they'd probably stick it at 0.8
hmm , seems to be two schools of thought on this then
0.8 would be playing safe i guess
i need to make it stop better first anyway
Didn't Jez comment that he'd seen 100% duty cycle on the same spec at about 0.7 bar
Of course you have the overfuelling top end of the std map to keep you "safe" for a little more boost.
Don't you have an AVCR Lee? I know people have said the injector cycle function isn't may be as accurate as it could be but you could use it as a guide
Basically if you run over 0.7/8bar you will be at 100% as has been said by numerous people many times.
Careful now
Adjustable FPR will be of some use as you will be able to up the base pressure.
I used one before I got my 555s
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Using an Adj FPR will just through the whole fuelling map further out he'd need to use it with an SAFC or similar to lean out the whole of the range except right at the top to gain any use. Expensive & fiddly just get some 550s and a Jez chipAdjustable FPR will be of some use as you will be able to up the base pressure.
I used one before I got my 555s
AVCR says I hit 100% duty at 5700rpm running 1 bar...
Sold , cheers phil , you've mind my mind up , some 555's and a Jez chip for me thenDidn't Jez comment that he'd seen 100% duty cycle on the same spec at about 0.7 bar
Of course you have the overfuelling top end of the std map to keep you "safe" for a little more boost.
Don't you have an AVCR Lee? I know people have said the injector cycle function isn't may be as accurate as it could be but you could use it as a guide
Basically if you run over 0.7/8bar you will be at 100% as has been said by numerous people many times.
Careful now
*cough* *commision please Jez*Sold , cheers phil , you've mind my mind up , some 555's and a Jez chip for me then
You'd better check my facts with Jez
If you do go that route remember you'll need Nismo 555s
it'll be after my little 4 month stint in the desert though, im sure Taka kairacan send me a little xmas pressie
christ i'll be busy in december
arbs
oil cooler
a few gauges
and now 555's
oh yeah some half decent front brakes too
...... the list goes on
On paper the safe boost would be around 12psi
In practise I dont think there have been any issues with 14psi.
Those are the 2 schools of thought.
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