BL Boost Modulator ECU
Turbo Mini Forums

Anyone got any data on what one actually does?

I'm thinking about using a mega jolt which could also control a bleed valve in the wastegate line.

I was wondering if the BL unit progressively varies the amount of pressure it dumps or opens 'n shuts the valve at just one rate.

If it's progressive then wouldn't it be worth keeping to hold the engine near it's maximum, none gearbox wrecking, torque for longer in the mid rev range?

Has anyone used the mega jolt for boost modulation? Would I be right in thinking that if you use a MAP activated output to control a bleed valve it will just raise the boost by a fixed amount, say 3psi, which would raise the torque in one step once it's past its peak - not as flexible as the BL valve: if it does pulse switch a variable rates that is.

If anyone is running the BL setup with a decent boost guage and rev counter it shouldnt be too hard to get some figures. simply plugging the end of the hose to the bleed valve would give a "control" set of readings to compare the valve with. Wiring in a LED or bulb into the valve's leccy circuit could give a crude indication too.

It just opens a solinoid at 4000rpm

Metro turbo weekend driver,Mini turbo in the making again!

Is that from personal experience Dangerous?

It says in Vizard that the valve switches rapidly to vary the amount of pressure it dumps. But it's a bit vague.

My cunning plan is to wire a 2nd vale through a switch in the gear selector so I get more boost in 3rd and 4th when the g'box has a better fighting chance.

Just need to figure out the best way of doing it. If the BL ECU provides a good, variable, boost profile I'd be inclined to use it as BL intended and use the other to raise the waste gate operating pressure by a few psi (adjustable bleed screw) throught the rev range when in the higher gears

I'd imagine that as the revs increase you get progressively less of the inlet charge into the cylinders so progressively higher boost pressures will keep the cylinders filled to nearer their optimum giving a less peaky torque curve.

Interesting reading 1071.

mine's a 1293 in a midas shell for the road- if I ever finish it!

I'm also using 9:1CR - what boost have you been able to run on bog standard lead free?

I doubt that mine is anything like as exotic but I'm also following the zen path of high lift ,short period valving

The ECU rapidly opens and closes the boost solenoid, at a variable rate, to progressively increase boost as engine revs increase. If you go to www.triple-m.co.uk and register, so that you can look in the FAQ/Tutorials section, I have done a full write up to explain why and what the boost modulation system does.