Dual Port Wastegate

[homesea]

Lol, yer 1.4 absolute. It gets to about 1.4 on the dial then blows it all off and the over boost kicks in and the car cuts out. I think Jon had the 3" exhaust on DHX before, I could be wrong.
I am not planning on going mad, but would like to get the car back to how it was when Jon had it. I do have a new engine and turbo on the cards, but no idea when I get round to putting it all togather. I still have a 968 clubsport itch to scatch and also my other projects a Golf GTI and Audi S2.

Wastegate is from www.pauertuning.com.

 

[Suffolk944]

I had the ESS/Janspeed exhaust on DHX which is a 2.5" system must have made a few hp difference. I know Scott got a significent power increase by simply fitting a dual port wastegate and not tinkering with anything else, 20 odd Bhp I think ? I think we have both been very happy with the L2 kit. Am wondering whether to go for the L3 kit at present.

 

[sawood12]

ORIGINAL: Diver944

ORIGINAL: Suffolk944

now I have an EBC my new car sits at 1.2 bar.

......and it's with the larger K26/8 turbo and you have a 3" exhaust which should increase the output flow as well as reduce any lag. It would be interesting to see your charts now.

I bet she'll make 274.6bhp now[] I reckon the difference that day was the grade of oil I am using!

That's done it. Mine's going in for the EBC install. I should stop kidding myself that i'm ever going to get round to doing it myself. Will be ineresting if I can hold 1.05bar all the way with my K26/6. If so I reckon i'd be good for 290+bhp. Guess i'll need larger injectors to deal with that extra air at the top end of the rev range.

 

[Diver944]

ORIGINAL: sawood12

Will be interesting if I can hold 1.05bar all the way with my K26/6.

My 26/6 nearly held 15psi with an EBC, it just started tailing off towards the redline.

The day after I fitted it was when my airbox decided to disintegrate so I never had it dyno'd [&o]

 

[sawood12]

Best check the integrity of my airbox then!

Was about to take the plunge with the Vitesse MAF kit & Piggy Back this month, but have had a costly few weeks with what started out as minor decorating turning into pretty much a whole house interior overhaul, so that might have to go on the back burner for a while.

 

[Suffolk944]

I certainly noticed the boost being held right up the rev range with the EBC have been very pleased with mine, well worth getting it fitted when you get the chance.

 

[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?

 

[Fen]

Someone has one - is it Tony?

 

[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.