Midmotorsteve

They are very cheap £17 ball and spring valve, all sounds good from the places that sell them but are there any down falls?

Electronic controllers such as apexi are £300 ish and they seem to do the same but remote from the cockpit. The dawesdevice website says the MBCs are better than the electronic ones cause they aer faster acting.

What are peoples opinions.

Its to go on a rev2 MR2 turbo

Roojai

Boost can be more sudden as they don't open the waste gate at all until the desired boost level is reached whereas a ECu/Electronic controlled boost curve might be a bit more gentle.
Might be an important consideration for RWD.

They also remove the ECU's ability to reduce boost if it detects something wrong (although ECU can still retard timing so not so bad)

Need good boost gauge and preferably knock-link to be 100% safe.

They work well though. I use one.

They work well though.

Midmotorsteve

has only 1 person got one of these ? anyone else ?

Kieran_Burns

iTrader: (1)

I ran my cally turbo with one for a while - cost a LOT more than that tho' (£100 ish) but was very controllable.

I lost overboost on the car (as you would expect) and then it started to run lean, but once I got the fuelling sorted (right before some inlet lifters went **** up and underfuelled two cylinders) I was able to set whatever boost the car could handle...

Held boost really well.. but as said, you do lose the safety feature built in to the ECU controlled set-up.

Worth it? Not sure to be honest, but I don't like mucking around with fuelling any more...

J4CKO

iTrader: (1)

I run one on my Fiat Coupe because the standard electro mechanical one went mental !

Smoothed it out no end but are a pain to set up as there is no calibration, set it and check boost levels by drivng it, dont entertain one unless you have a decent (i.e. not factory) boost gauge, also an air/fuel ratio meter can be a good idea if you intend to raise boost to avoid potential under fueling and the side effect of melted or holey pistons.

Problem I have had with mine is it getting sticky and I loose boost, quick blast with WD40 sorted it out, proper electronic one is the way to go though, just cant afford one.

Mines a 25 quid Ebay one.

Midmotorsteve

yeah the potential fueling probs is what i was worried about, i'm having a turbo conversion on my mr2 and intend to have a FCD, adjustable pullys, down pipe and grainger valver fitted when the engine goes ina nd have it rolling road setup at http://www.millwayvehiclespecialists.co.uk then not play with it. They should be able to get it all 'safely setup on a r/r shouldn't they?

I just can't afford melt downs, but equally would prefer not to have to find the money for electronic control.