360glt MAF sensor limits?

[Ali]

Does anyone know the limits? After reading a thread on turbobricks about turbo charging the B230e and being able to run 6-7psi boost on the standard ecu I figured there must be some room for more airflow on the b200e ecu? Using higher flow injectors from a turbo model if necessary?
cheers
Ali

[Fuse]

As I replied in my private message, the MAF-sensor in 300-series isn't limiting factor (well of course it will be limiting in somewhere when not enough air can pass through it but I guess that won't be the first problem) because the flap will bottom out in stock setup too. When this happens the ECU switches to hard coded enrichment map which is RPM-dependant. So if you want more fuel, best bet is to raise the fuel pressure and maybe new injectors. Of course when you do this your engine will be too rich when on idle or under light load. This can be compensated by tightening the spring in MAF so it won't be so sensitive. But warning to all who think about raising the fuel pressure, please check your fuel lines that they can handle the increased pressure. More burned 360 turbos wouldn't be nice. Some might remember what happened to Makkiver's 360 turbo.

I haven't done any of these modifications by my self. I just have heard/seen some people doing this so I can't guarantee how it would work.

Some people have reported that 5 to 6 psi boost would be fine with stock system too. This might be also the case with my setup because this guy who renovated my turbo said that when he test drove the car he didn't notice the fifth injector to come on. (I run ~0.45bar) He suspected that the car might have had higher boost and intercooler in somewhere in it's past so that's why the enrichment system. Though my plans include an aluminium intercooler and raising the boost a bit so it doesn't hurt to have that thing in there either. Though I don't know which injector I have but I guess those are stock.

What ever you do the air/fuel ratio meter would be good to have too. Lean mixture causes detonation and that destroys things VERY fast. So remember kids,, responsibility is yours.

[foggyjames]

As Fuse has hinted, 'tinkering' with the stock system is definitely a bodge. I'd definitely back up his advice to get an oxygen sensor with an AFR readout, but do yourself a favour and get a wideband....narrowbands are pretty useless.

cheers

James

[huskyracer]

what mods are you planning? the injection system in good order will have a fair bit of headroom, usualy in the order of 15-20% the mods fuse sugested will work well with mild increases over and above what the system will take anyway, but do head his advice about the fuel lines etc. fitting bigger injectors is not realy an option, as it will make the car run far too rich everywere it doesnt need the extra fueling, ie all the time you havent got your right boot welded to the carpet. just a small point, but the full load enrichment fuse mentioned is controlled by a contact in the throttle potentiometer not in the air flow meter

[Ali]

Well really it was because the b200ft exhaust and manifold will swap straight onto the b200e so it'd be an easy job to get a custom downpipe and plumb up an intercooler. The original idea was to get the ecu, loom and injectors from the b200ft but after looking at one in a scrappy it looked fairly tricky and they wanted £150 for the lot Steve showed his disgrace by performing a nice rolling burnout out of the carpark lol, i'd read about being able to run 6-7psi on b230e stock engine management so thought there may be room for a small amount of boost on the b200e ecu, sounds like its going to be running lean on boost though so not a good idea at all?
cheers
Ali

[huskyracer]

Dont know untill you try mate! Im sure our collective knowledge can get round any problems, and I think you would be surprised how close it would be out the box as long as the boost was kept low

[foggyjames]

I'd go with that Just a minor point though...the yanks are running 6-7psi on B230Fs with electronic FI, not our mechanical injection B230Es.

I think Fuse was thinking of the B230 turbos with LH2.4, where the WOT pin isn't connected to the ECU (unlike the NAs, where it is), and it detects WOT by referencing airflow against RPM - presumably on the basis that you could be making loads of boost, but not quite be at WOT. At least I presume that's why.

Ali...why didn't you just pull the two ECUs from the 200FT, then get the rest from a common-as-muck 230...much cheaper!

cheers

James

[SteveP]

Ali...why didn't you just pull the two ECUs from the 200FT, then get the rest from a common-as-muck 230...much cheaper!

Well thats what we thought at the time! However, car located in a huge puddle and interior full of glass Most windows smashed in, and in that yard they think its a good idea to lift cars up with a forklift.. through the windscreen...

[Fuse]

Well Makkiver ran something like ~1bar with Le-Jetronic if I remember correctly. Though if he adjusted the fuel pressure so that it wasn't too rich or too lean there was heavy detonation at 3500rpm if he went full throttle at below 3500rpm, after or below that no detonation. Some kind of flatspot there. When he raised the fuel pressure more it blew lots of black smoke and unburned fuel when below 3000rpm, after that it worked fine. He had 400cc injectors. He might have gotten better mixture under 3000rpm if he would have adjusted the spring in MAF.

And he also said that after 200km/h it tend to blew head gaskets so if someone wants to run lots of boost with LE-Jet he needs to be prepared to tinker a lot.

[Ali]

Well I wouldn't be aiming for that much boost, I know running low boost makes it kind of pointless but surely has to give a fair increase and keep reliability up? I guess the only way to know would be to fit it and get a MBC and use wideband to see whats happening?
cheers
Ali