mgtkr1

hi there, i have asked many faq's on here of late and you lot have been helpful, a source of expertise. so thanks for that. anyway, i had an amal valve and would get boost limit of 6psi, sometimes 7 if my bvoost guage is not bullshitting, the extra psi would be on colder evenings, im guessing the dense colder air would be more efficent thus raising psi. anyway i got a 3 way bleed valve, fitted it fully locked off then intending to work from there, 1 hsalf turn at a time. first time out since fitting, on a steady throttle input the boost rocketed past 10psi, heading toward 15 according to the mrs. good news i s'pose as that means the ecu is chipped. bad news because my bleed valve is having zero effect on controlling things on a safe level. does this mean the actuator is set high? and does it mean setting the actuator for low boost, then gaining the odd psi via the death valve? dont get me wrong, it dont harf shift but been a old man now with a family i have to be sensible (relatively). ps i have a new -31 actuator en route anyway so i may start from scratch with that. any ideas/tip[s ect would as usual be greatly appreciated, cheers matt

mk1trb

how is the bleed valve set up fitted? i noticed iff it was fitted between the amal valve and actuator the boost was really strong and held well but if it was just looped from actuator and compressor housing it had a mind of its own would spike high and drop right back but that can also be down to weak actuator. best get it set up properlly anyway as a rs will run unlimted boost if unchipped but will feel like you hit a limiter as she will "boost cut" around 4000rpm which is high enough to run lean and make things go bang

martysmartie

iTrader: (1)

Sounds like the valve is setup wrong, clearly it's something to do with it, as it's only since this has been fitted you have had the problem!

You can't just raise the boost like that, as it may not be mapped for it and hence you will damage the engine!

6/7 PSI is lower than standard even!

Martin

luke19790_3

get a -31 then get it setup by someone who knows rs turbos.

Once setup leave the boost alone

Chopshop85

iTrader: (4)

I would suggest, take it to a tuner before something melts/lets go.
To many sob stories of home tuning when it comes to increasing boost!
When I last got mine set up, they tested the injectors, timing, fuel pressure... there is alot to take into account to ensure a healthy running engine. Not just the PSI the turbo is making.

mgtkr1

yes, setup is top of the list. i have fitted the bleed valve in place of the amal, not in tandem with it. i know you have to be vcareful re fuelling ect and also im aware that the small hoses to the amal or in this case the b/valve can have negative effects if there the wrong id. the hoses are the same as what was on previous with the amal. im thinking i have made an error somewere, the bleed valve is inline with the housing/actuator and the 3rd/mid stub is linked up with the airbox as its done on the amal. once its were i want it, it will stay. im not one to fiddle/melt engines on the basis of been in the dark.

martysmartie

iTrader: (1)

Yes so it HAS to be something to do with the valve, by the fact it was ok before this was fitted.

Martin

mgtkr1

it must be mate like you said. getting back to another popst, i thought the std boost was 6psi with an ecu limit of 10psi? if the std boost is higher, what is the std boost level and if its only boosting at 6psi does this mean theres a problem. ie is 6psi the ''hget you home'' mode? if thats the case then does that mean a fault points toward the amal? a bit of a drift in topic here but that post got me thinking. just to clarify, the boost is now higher as the bleed valve is fitted in place of the amal. the 6psi was with the amal fitted and NO bleed valve. sorry to keep going on lads, its all sinking in, eventually!!

martysmartie

iTrader: (1)

It's either the mechanical valve is setup incorrectly, or the Amal valve is faulty etc.

The way to tell is WITH the engine running check for power at the electrical connector for the Amal, you should see +12V, if you do all is well.

Next plug the Amal in, you should hear/feel it click when it's connected. If not then the valve is faulty and most likely to be causing your lower boost pressure.

Martin

mgtkr1

ok cheers mate, suspected the amal was iffy. thanks for the help peeps.

Karlos G

iTrader: (4)

Stock boost is 7psi, some ECU's will run 10psi before boost cutting some wont.
But do not even think about raising it above stock without it being on a RR with detonation and fuelling being monitored you'll risk destroying your engine, for all you know it could already be lean! 20+ year old metering units do not fuel as reliably as they once did and often drift out in no time at all.