midlandvauxhalls
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Registered: 23rd Jul 05
Location: Leicester
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quote:
Originally posted by Steve
i can only comment on my VAG engine but to have any effect you will need to rip out a number of valves to make a MBC have any hope of working, N75 valve as well as the N249 valve, im sure there are similar tpyes on other ECu controlled cars
all the c20let has is 1 amal valve.
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AK
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Registered: 5th Jul 00
Location: Aberdeen City
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what are you on about...
Most cars will just need a slight re-map, or boost cut defencor introduced to overide ECU signals to cut the engine over certain boost
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midlandvauxhalls
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Registered: 23rd Jul 05
Location: Leicester
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quote:
Originally posted by muppetsport
quote:
Originally posted by midlandvauxhalls
quote:
Originally posted by muppetsport
but really, an mbc is a bleed valve whichever way you look at it. if you think it isnt, then thats fine.
it really really is just a bleed valve
yes but you could say the same thing about the apexi, just its digital.
yes, i know how the apexi works etc, and i know all it is is a digitally controlled bleed valve. i just dont understand how the mbc isnt a bleed valve??????
cause a mbc doesn't bleed air out like a bleed valve does, reason a mbc is a ball and spring device.
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Ditch
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Registered: 29th Nov 02
Location: St Albans Drives: JDM Celica GT4 WRC
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point is... the apexi uses a soleniod to control the desired wastegate pressures... whereas a MBC uses a ball and spring...
as AK has already stated, the solenoid holds more steady boost than a ball and spring...
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midlandvauxhalls
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Registered: 23rd Jul 05
Location: Leicester
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quote:
Originally posted by AK
what are you on about...
Most cars will just need a slight re-map, or boost cut defencor introduced to overide ECU signals to cut the engine over certain boost
yes i said in a ealier thread that the c20let still cuts ignition if u try too run more the 12psi with a mbc on a standard ecu but people didnt agree.
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midlandvauxhalls
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Registered: 23rd Jul 05
Location: Leicester
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quote:
Originally posted by Ditch
point is... the apexi uses a soleniod to control the desired wastegate pressures... whereas a MBC uses a ball and spring...
as AK has already stated, the solenoid holds more steady boost than a ball and spring...
i had major boost spike problems using a apexi, but i understand that they are hard too setup and get perfect.
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AK
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Registered: 5th Jul 00
Location: Aberdeen City
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Is this a "bleed"?: No. It is a pressure-controlled device, unlike a bleed. One big disadvantage of a bleed is that the boost signal is always acting on the wastegate as the boost builds. This means that the wastegate is allowing exhaust gas to bypass the turbine at the exact time you need it to be spooling up your turbo. The Basic Boost Controller holds the signal from the wastegate until it reaches the level that you have set. Because of its rapid actuation, "spiking" (momentarily exceeding the boost limit) is almost completely eliminated. Some electronic controller companies actually try to promote spiking as a positive feature, because their controllers cannot react fast enough to accurately control the problem.
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midlandvauxhalls
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Registered: 23rd Jul 05
Location: Leicester
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quote:
Originally posted by muppetsport
right, i get it now.
just a different method of doing the same thing, and also over riding the ecu's control over the boost at the same time. which i should add is also what the phase chips do
yes 
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midlandvauxhalls
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Registered: 23rd Jul 05
Location: Leicester
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quote:
Originally posted by muppetsport
quote:
Originally posted by midlandvauxhalls
quote:
Originally posted by AK
what are you on about...
Most cars will just need a slight re-map, or boost cut defencor introduced to overide ECU signals to cut the engine over certain boost
yes i said in a ealier thread that the c20let still cuts ignition if u try too run more the 12psi with a mbc on a standard ecu but people didnt agree.
hang on, what we didnt agree on was that you said the ecu can cut the boost even without the amal valve connected up, thats what we were on about on the other post. the amal valve is the ecu's only method for controlling boost, and if you remove it, you loose it. nothing about ignition cuts or nothing
ok u proberly wont want too try this but if i told u too put a standard ecu and use the amal valve it will boost cut if u try too run more the 11-12psi, now disconnect the vacuums going too the amal valve and fit a mbc in place it will still boost cut at the same boost level unless you get the ecu chipped.
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AK
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Registered: 5th Jul 00
Location: Aberdeen City
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basically...
Its 80% as good as a 500quid boost controller (DSBC-R), but 100% better than a shite bleed valve..
IT IS NOT THE BEST, but best for those on a budget!
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midlandvauxhalls
Member
Registered: 23rd Jul 05
Location: Leicester
User status: Offline
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quote:
Originally posted by muppetsport
quote:
Originally posted by midlandvauxhalls
quote:
Originally posted by Ditch
point is... the apexi uses a soleniod to control the desired wastegate pressures... whereas a MBC uses a ball and spring...
as AK has already stated, the solenoid holds more steady boost than a ball and spring...
i had major boost spike problems using a apexi, but i understand that they are hard too setup and get perfect.
no, not hard to set up at all. teach it the gears, then reduce the duty in higher gears to stop massive boost spikes. quite simple really, and works well. ive used one for 6 months or so now
shame i couldnt get it too work as good.
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midlandvauxhalls
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Registered: 23rd Jul 05
Location: Leicester
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yes but it still cuts it too save the engine like the amal valve does if you run too much boost, meaning only way too run more boost on a c20let is too have it chipped or mapable management.
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midlandvauxhalls
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Registered: 23rd Jul 05
Location: Leicester
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theres 2 types of boost cut, 1 when eng light comes on when somthings wrong which IS done by the amal, the other is where you exceed the boost limit which is cut by ignition/ fuel.
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AK
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Registered: 5th Jul 00
Location: Aberdeen City
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fuel cut..... brick wall 
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midlandvauxhalls
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Registered: 23rd Jul 05
Location: Leicester
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quote:
Originally posted by AK
fuel cut..... brick wall
yep = 
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AK
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Registered: 5th Jul 00
Location: Aberdeen City
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i want a c20let corsa..... any cunt selling one that works, cheap.
Just a rolling shell with working engine, transmission and a seat would do
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midlandvauxhalls
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Registered: 23rd Jul 05
Location: Leicester
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quote:
Originally posted by muppetsport
i see, so is an ignition/fuel cut then. makes sense.
and yes, totally agree about the chipped ecu/managment. infact going motronic-less is possibly the best bet for the let anyway
yes it is
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Robin
Premium Member
Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
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Adam - I've not read the thread, so it might not actually work, but - http://www.corsasport.co.uk/board/viewthread.php?tid=273819
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Robin
Premium Member
Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
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on second thoughts, that engine looks like its been thrown in by a monkey
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AK
Member
Registered: 5th Jul 00
Location: Aberdeen City
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made an offer
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Robin
Premium Member
Registered: 7th Jan 04
Location: Northants Drives: Clio 182 Cup
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much for?
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midlandvauxhalls
Member
Registered: 23rd Jul 05
Location: Leicester
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quote:
Originally posted by robmarriott
on second thoughts, that engine looks like its been thrown in by a monkey
yes, reason its proberly been on sale for months and months.
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AK
Member
Registered: 5th Jul 00
Location: Aberdeen City
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2k cash
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midlandvauxhalls
Member
Registered: 23rd Jul 05
Location: Leicester
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its either no one wants it cause he's asking too much or there something wrong with it now cause its been forsale for yonks now.
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AK
Member
Registered: 5th Jul 00
Location: Aberdeen City
User status: Offline
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a few bits would be binned if i got it
Wheels, interior, ice etc
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