dual port wastegate

[Diver944]

Tony had the first one in our little clique, then I got one and so did Peter S Howell and there is one other (which I think is EDH). From my point of view it was very easy to fit, worked straight away and even though I had a completely non standard engine the air fuel ratio was virtually bang on the money straight away. Those with 2.5 engines will be even closer than mine was because he has supplied so many. Support from John at Vitesse is absolutely top notch and even when I stupidly broke my wiring loom he sent me a replacement within two days

 

[sawood12]

ORIGINAL: homesea Scott, I have also been looking at the Vitesse MAF kit especially since my AFM dead. I got a 2nd had AFM at a good price in the end. Anyone else on here run the Vitesse MAF? Also why would a MBC tail off at high boost when a EBC will hold on?

Well an MBC is a simple mechanical valve so has no close loop control or intelligence. Not sure exactly how they work. An EBC is a closed loop control that constantly monitors the turbo pressure signal and compensates in real time to maintain a pre-set level of boost. As far as I can see the Vitesse MAF kit is a great piece of kit and with the piggy back fuel controller gives you 90% of the capability and flexibility of a stand-alone for a fraction of the cost and hassle. As Paul says the basic MAF kit is plug and play - I.e. remove your AFM and replace with the MAF, plug the harness into the AFM plug, replace chips and hey presto you get a working and fully funcioning MAF. Most (if not all) other MAF kits out there are not 'true MAF'. They simply convert the MAF signal to an AFM signal so basically act as an AFM replacement. What Johns kit does is to take the MAF signal and through to the ECU and via his chips carries out the calculations to provide the correct fueling for the airflow. This provides a true MAF signal so if you ever replace the turbo or change the configuration of your engine the MAF will adapt with no need for hardware or softare, whereas other kits will need new ECU chips.

 

[944Turbo]

Yes me and Paul (diver944) and a couple of others, mine ran rich out of the box but I have a hybrid turbo and Mike at Vittesse had to make a guess for the base settings - in any case he reccomends the piggyback for non standard installs which allows the fuelling to be adjusted. Nicely made and it doesnt max out like the standard AFM, it meters through the full rev range and throttle travel. It will adjust the fuelling to compensate for different boost levels (within limits) Tony

 

[homesea]

To use the piggy back controller will a new lambda probe have to be added to the exhaust? otherwise how will it know about the amount of fuel?

 

[Diver944]

The piggyback allows you to control the fuel delivery (and a host of other things - timing, rpm limit, water injection etc) but you do need an accurate method to monitor the AFR. You can either take it to a rolling road and tune it there or install a wideband O2 sensor and log it all yourself. The piggyback can interface with the standard lamda sensor but this is narrowband and is not sensitive enough for safe and thorough adjustment.

 

[edh]

Vitesse MAF working well here [] I have had some problems this year, traced to a faulty MAF. It was an intermittent fault, so hard to trace, not helped by a certain garage struggling to understand anything non-standard. (It failed while it was at a garage having rollers/belts done) While it took a long time to diagnose, John @ Vitesse was excellent, & turned round the replacement very quickly. AFR's look very good. I went for it so that I could make more gradual changes to the car & not have to keep swapping chips. MBC & DPW to come next (probably followed by an SPS turbo when this one packs in [])

 

[edh]

I also seem to get better mpg, particularly on long runs - not what I bought it for, but pleasing nonetheless. I get around 30mpg on the m-way, usually 80-90mph and not necessarily driving for economy []. I reckon on getting another 30-40 miles between fill-ups.

 

[homesea]

So do you all run wide band O2 sensors? If so did you have to get the exhaust re-tapped? and at what point in the exhaust?

 

[edh]

no - I had my afr's checked at the "rollers of truth"

 

[appletonn]

Ed, so did you buy the MAF directly from John at Vitesse and exactly what did you get in your MAF kit? Just interested and definitely NOT thinking of upgrading any time soon, honest, quite categorically, probably, definitely, maybe.......[8|][]

 

[edh]

yes - it was all very simple I bought the stealth MAF, chip & injectors, and a small harness to connect the MAF to the AFM plug (John won't support his MAF on std injectors)

 

[Diver944]

ORIGINAL: homesea So do you all run wide band O2 sensors? If so did you have to get the exhaust re-tapped? and at what point in the exhaust?

Yes, I have the Wideband Commander system from Dynojet. It is in the horizontal section of the front pipe just after it has bent round from the vertical section coming from the turbocharger.

 

[edh]

Does it fit into the hole where the normal lambda sensor goes? (mine has a bung in the exhaust there, instead of a sensor)

 

[homesea]

When I was going to run my 20v turbo Derby I was thinking about using MegaSquirt. They sell Wideband O2 sensors at a good price. See the link below, what do you guys think? http://www.diyautotune.com/catalog/wideband-systems-c-23.html?osCsid=e3ed1eacbc9f72d9a7f9be1deec9bd2d

 

[Fen]

A wideband will fit into the collett where the OE one goes (or is plugged) but it won't work as that point gets too hot for the 5-wire wideband sensor to work. It needs to go where Paul described, just where the exhaust goes horizontal. It should also be angled down about 10 degrees. There is enough room to fit one (a Bosch one at least) between the exhaust and the chassis leg and run the wire in the corner between the leg and the floor. Just buy a Bosch sensor if you have something to run it (there are probably only 2 or 3 types and they are all do the same). I have an Innovate setup and the sensor died (probably either run with the heater on and engine off, or engine on and heater off - best to wire it via the fuel pump relay so it can only run when the engine is running rather than via the ignition or a separate switch). The replacement cost about £100 from the local Bosch fuel systems agent.

 

[944Turbo]

I also decided on an innovate but as I have only got the bung fitted so far cant really report on it - came in a nice box and looks good Mike at Vittesse can sometimes get a good price on them - though mine came from elsewhere, Tony

 

[sawood12]

The Vittesse kit can run in either open or closed loop. if you want to run it in closed loop and you have a car that doesn't have a lambda sensor then the piggy back kit can take the raw wideband signal and run wideband from that. I've got an Innovate as well, and only got as far as having the bung welded in. I don't know whether or not to bother with the piggy back right now. Can do without the extra expense and is a bit trickier to fit than the MAF kit. I guess on a standard turbo and engine Johns out-of-the-box settings will be fine. I think i'll leave the piggy back (and his new V-Flex system) for a later upgrade. I'd also be interested to see what changes the MAF kit makes on its own.