rotorheadcase

Hi all,

Has anyone had any experience with Specialist Components in the UK and their MAF conversion kit? It looks to be reasonably priced and importantly offers tuneability for future upgrades.

Regards ,

Neil

Mark Brook

Hi Ne,

Stick VEMS in the search.

Cheers,

Mark 90 C2

BLACK-BETTY

Delete

John McM

Neil, I replied to your PM.

Unless you are dedicated to spending some Dyno time and educating yourself on engine management system testing and/or have modified the engine I consider the original system with maybe a SW chip to be all you need.

StanUK951

OP, I have the kit fitted to my car if you want some feedback.

Fitted the kit myself and drove it to SC to be rolling roaded. With cams, decat and long neck J pipe, my car produced 305bhp. To me it felt smoother to drive and more responsive, but I know I had an issue with the old AFM too, which was another factor for going with this setup.

John McM

Stan, I'm envious of your access to the kit makers. Do you get pops and bangs on overrun? Can you share the configuration?

rotorheadcase

Thanks Stan, I've spent the last couple of days reading every thread I can find....John's posts in particular. Dyno time seems to be the critical factor for a good setup. I would love to pick your brain s over the next little while as I digest what I'm reading.

Neil

John McM

I think Dyno time is an absolute necessity, if nothing else but to ensure AFR is correct.

As you will have seen from my threads there are some other factors as well e.g. overrun settings and fuel pump timing delay. It's great it works out of the box, but when your glass out respray is turning yellow from fire damage it would be nice to know what overrun setting allows for the OE quality running conditions.

StanUK951

I don't particularly notice much of any overrun popping or banging to be honest, at least, no more than before with this exhaust configuration!

As an aside, I find the combination of decat a J pipe a bit too loud and am looking at options to change this setup. I refitted the standard final silencer recently for a trackday (too quiet!) but on reverting back to the J pipe I noticed a big difference in low down torque and general improvement in drivability. My car was tuned with the decat and J pipe setup.

Another Rennlister on here did contact SC and because he was based in Singapore they sent him a copy of my settings as a file. However, he was using the exact same cams as me. SC were good enough to email me to ask my permission before sending the file as well.

John McM

Thanks Stan. My setup is cat and primary bypass. Everything else is standard on the car except LWF, which I managed to adjust the setup to cure the stalling endemic to LWFs.

My car backfires at the first sign of any overrun and is burning my new paint job. Right now I'm getting the original injectors serviced in preparation to re-install the OE set up with a SW chip. I have two C4s and the other one is so civilised I realised this isn't for me. I don't have the inclination to spend hours at the dyno knowing that I will still likely be left with the overrun issue.

BTW Robt964 shared his configuration with me. There was nothing obviously out of order with mine.

Raceboy

WIth VEMS you can get already well-running map for 964 and you can fine tune it with its autotune (VEMS comes with wideband integrated). It will run perfectly, no popping on overrun etc. At 1250 euros shipped it pretty much beats anything in the market and has endless upgrade paths without any additional costs to "unlock" or something. Just buy hardware you want and change settings.

robt964

I've been using the Specialist Components kit for a while now and had no issues to speak of. The Map worked fine for me out of the box with the exception of a few tweaks around the idle control and idle fueling. I've had a few dyno days with Specialist Components but that's because my configuration is no longer stock. They've recently updated the tuning software. It's a good piece of kit and dead easy to install. The best bit tho is that its a fully supported product, ie you get a phone number you can call and actually speak to very knowledgeable/approachable people if/when en you have issues or questions. Provided you don't have plans to move away from naturally aspirated then the Typhoon 2 is a very capable unit.

Raceboy

With VEMS you also get a phone number to call and 18 hour a day support via instant messaging, and it supports any engine configuration, including boosted, COP or whatever. Plus it works with Tiptronic cars. Not many do in fact.
With 964 bigger injectors are almost essential as stockers are really the limiting factor for more power (they are more than 100% open if you optimise mixture to max power).

There's a turbocharged 964 Tiptronic (with milled down pistons) running in Finland that runs E85 with FlexFuel sensor, making 450+ hp, drives actually much better than with stock DME

tjb616

Raceboy, do you have any more info on that build? I've read that due to the ceramic cracking and chipping in 964 heads, the turbo'd NA route isn't a great idea. I've been curious for a while if there is a solution other than using 993 heads.

On another note, what is the most common injector upgrade for 964's?

Raceboy

Owners name is Matti but I haven't seen his project anywhere in the forums. I can get some details from him though and some photos.

Most common injector upgrade is either some Audi AAN (cheap and plentyful) or Bosch 415cc ones (new, cost ~50 euros a piece).