Electronic Boost Controllers
- Thread starter John Sims
- Start date
I have a greddy profec B spec 1, it is dual solenoid (in series) and has a simple knob arangement, One knob (gain) affects how quickly it switches the solonoids. It has two further knobs one for setting the low boost and one for setting the high boost with a switch for flipping between the two.
There is a nice selection here http://www.modacar.com/products/Acura/Integra/MODAAPE
I have the control box in the glove box, the solonoid fits neatly in the corner of the engine bay.
The Bspec 1 was supposed to be discontinued, and the type S was developed as a replacement because there was still a demand for it, The B spec II has more features.
My boost curve last year had a flat line I cannot seem to quite replicate it this year, but I believe I have a boost leak,
Tony
There is a nice selection here http://www.modacar.com/products/Acura/Integra/MODAAPE
I have the control box in the glove box, the solonoid fits neatly in the corner of the engine bay.
The Bspec 1 was supposed to be discontinued, and the type S was developed as a replacement because there was still a demand for it, The B spec II has more features.
My boost curve last year had a flat line I cannot seem to quite replicate it this year, but I believe I have a boost leak,
Tony
Closed loop only works at part throttle settings, and many boost controllers do not offer overboost protection. That reminds me my profec spec 1 developed a leak on the pressure sensor after 30k miles or so. This resulted in some fairly major overboost situations (35PSI and wheelspin in 4th) it was fairly easy to reseal ands seems fine since.
Tony
Thanks for your input guys. I am currently drawn to the Greddy Profec B-Spec 11, not least because it looks like I could get one new for £200 on eBay. [
]
We are off to make discrete progress around Scotland next week so I won't be doing anything for the next couple of weeks. I still welcome your comments none the less.
]We are off to make discrete progress around Scotland next week so I won't be doing anything for the next couple of weeks. I still welcome your comments none the less.
I haven't looked into it personally, but I have it on good authority the DME has two ignition outputs but that they are siamesed on the board inside. I guess that doesn't limit the number of coils it can run per se, but it can only fire them all at the same time which would mean COP may well work, but with 3 sparks wasted out of every 4.
I should have said something like "the DME can only control one coil". Does the "single coil pack" they provide have 4 outputs on one coil? If so that would back up the theory as it isn't even worth them supplying a pair of dual output coils (which would be better if they could be controlled independently as they would each fire half as often giving them twice as long to ensure they are fully charged between firings).
Of coure my good authority may be wrong, but isn't usually [
].
AndrewS
Member
Hi All,
Looking specifically at the Manual Boost Controller supplied with many Dual Port Wastegates - these work on the principle of regulating air pressure on the controlling (side) port of the wastegate.
Its possible that the regulating aspect of these controllers varys as more pressure is applied to the regulator, but I would have thought they would remain pretty constant. Set an MBC to 1.0 bar (where the pressure out is measured at 1.0 bar) and then continually increase pressure on the inlet side. The regulated outlet pressure should remain at 1.0 bar - worth testing this to be sure.
It's more likely that leaks elsewhere in the system are the cause of the loss of boost pressure. As an EBS uses a venting solenoid controlled valve it compensates becuase the electronics are programmed to maintain a set pressure - hence it switches very quickly in an attempt to maintain this. Minor leaks are probably tolerated by an EBC but not an MBC.
Food for thought anyway. I'll read that back later and probably realise my logic in that statement was flawed somewhere ;-)
Regards,
Andrew
Looking specifically at the Manual Boost Controller supplied with many Dual Port Wastegates - these work on the principle of regulating air pressure on the controlling (side) port of the wastegate.
Its possible that the regulating aspect of these controllers varys as more pressure is applied to the regulator, but I would have thought they would remain pretty constant. Set an MBC to 1.0 bar (where the pressure out is measured at 1.0 bar) and then continually increase pressure on the inlet side. The regulated outlet pressure should remain at 1.0 bar - worth testing this to be sure.
It's more likely that leaks elsewhere in the system are the cause of the loss of boost pressure. As an EBS uses a venting solenoid controlled valve it compensates becuase the electronics are programmed to maintain a set pressure - hence it switches very quickly in an attempt to maintain this. Minor leaks are probably tolerated by an EBC but not an MBC.
Food for thought anyway. I'll read that back later and probably realise my logic in that statement was flawed somewhere ;-)
Regards,
Andrew
I think in some cases (eg simon) the boost is building so quickly that the valve has to be set low to avoid a boost peak. I think if he were to set up the valve to open at 1 bar he would hit a peak somewhere above this then slowly return to it as the wastegate allowed the excess pressure to bleed. basically I think the valve is opening at a level that he overshoots and then drops back down to - I could be wrong though []
Although it doesn't make headline BHP figures yet and needs more setting up I was impressed with Simons car, I even had a look at my turbo to see if it was looking worn yet - it wasn't - anyone want to buy a k27/8? []
Tony
]Although it doesn't make headline BHP figures yet and needs more setting up I was impressed with Simons car, I even had a look at my turbo to see if it was looking worn yet - it wasn't - anyone want to buy a k27/8? [
]Tony
ORIGINAL: Fen
I haven't looked into it personally, but I have it on good authority the DME has two ignition outputs but that they are siamesed on the board inside. I guess that doesn't limit the number of coils it can run per se, but it can only fire them all at the same time which would mean COP may well work, but with 3 sparks wasted out of every 4.
I should have said something like "the DME can only control one coil". Does the "single coil pack" they provide have 4 outputs on one coil? If so that would back up the theory as it isn't even worth them supplying a pair of dual output coils (which would be better if they could be controlled independently as they would each fire half as often giving them twice as long to ensure they are fully charged between firings).
Of coure my good authority may be wrong, but isn't usually [
To be honest dont know, I haven't really looked into it,but IMHO one of the biggest weak points of the ignition is the rotor arm and distributor, even if 3 out of 4 sparks are wasted provided the coil pack has a capacity to provide them does it matter? However I think if you desire all the Vitesse add ons the price would add up and you may as well go standalone anyway and get a new brain rather than one that may devolop strange faults through old age and the bonus of more flexibility.
Tony
I edited that response many times before hitting send and at one point I had agreed losing the dizzy is probably worthwhile, but somehow it didn't make the final cut [&:] I do agree the lack of dizzy is a good thing, even if there are 3 wasted sparks out of 4, provided the coil has enough recharge time to cope with that.
ORIGINAL: John Sims
ORIGINAL: 944Turbo
........old and creaky but with the right add enhancemants can still perform tricks like a youngster
Tony
One assumes it also continues to perform those tricks for longer as well. [8|]
...but gets to perform them far less frequently than it used to do.
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