Vitesse/M-Tune ?

[blade7]

I wonder if anyone in the UK is using a Lindsey supplied M-Tune ? Each time I reach for my credit card a thread starts on Rennlist about idle issues...

 

[PSH]

I would ask myself which system have I not seen any problems spoken of and go for that especially when so many users have only had good things to say about it....there has been a number of recommendations already given in this thread for such a system...imho there is no other choice.....

Pete

 

[blade7]

Fair points well made, though when I asked Rogue a few months back he didn't want £££ extra to load 2.5 and 3.0 maps...for the time being I'm still on the fence.

 

[PSH]

I grant you that some of the costs/procedures seem expensive, I had the same thing wanting to upgrade from V-MAF to V-MAF plus, in the end it was better to buy a complete new chip....this I did as I knew that not only would it work out of the box but that it would work better than any other.....I also paid for extra maps allowing me to use my 55lb injectors to run the new engine in....I should have asked for a map using all of the new systems with the 55's too....to date I still haven't installed larger 80lb injectors for which the other maps including the all important ignition maps are set for. It will be a fun day when I finally get around to that...however for now the car runs so well using my old Wayne Schofield map(with a few tweaks to the piggyback) and the extra V-MAF benefit of full boost protection, (she is easily over 400 and sounds awesome) that I'm content with things as they are....however I look forward to fitting the 80's and setting the chip to what John calls 'the most aggressive ignition mod', there's a few jumper settings on the chip to play around with....

Pete

 

[blade7]

Thanks for the info Pete. Did you have to use resistors for the injectors, and how many miles have you done now since the rebuild ?

 

[PSH]

I think the resisters were built in but would have to ask my son...I just can't remember such details these days..I do recall him saying something about resistors(or lack off) but it contradicts what my poor memory recalls...car has done around 7k which is getting very close to my classic insurance limit for the year and i still have 2 months to go...lol The only issue that I've had is with the coolant leak that I had mentioned last year in my build thread, after replacing a suspected hose and then machining flat a warped flange the leak persisted which turned out to be a hairline fracture in the head just below the replaced hose (the reducer hose that leads to the alloy elbow where the bleed screw is) Anyway the car had done thousands of miles with this small leak which I had lived with but recently decided to remove the head and get it sorted for this season, I plan to put everything back together this week having now received the required custom cometic head gasket from Lindsey last week. Head has been successfully welded, pressure tested and vacuum tested which showed a few leaks on the valves (not a surprise considering replacing 5 angle with 3) and so has had the valves/seats machined and is now leak free, I have also as a matter of course replaced the valve seals again.
The cause of the hairline crack in the head was a bit of a mystery...the engineering company who did the work stated when asked that they didn't believe it was due to high boost (I have two Apexi settings for 1.3 and 1.5 bar respectively with boost protection set at 1.5) nor was it stress, they had never seen a hairline crack like this before, which was just below the elbow mentioned, the crack was only on the top of the head, there was no damage along the head/block mating surface hence why I only had issues with coolant.
This left me thinking that perhaps it was due to a combination of the extra thick HG and the raceware studs even though they were torqued correctly and unlikely as the crack was only along the top? just in case when I put it back together this week I'm going to change the tightening sequence adding more stages to allow for the thicker HG. Anyway this is where I was at until both my son and wife reminded me of an incident in the workshop that I had forgotten about and then it all fell into place, last year I had accidentally dropped a lump of cast iron onto the head in the area damaged while moving it( much cursing/swearing involved), this must be the culprit as it was a heavy lump which hitting that part with the coolant void beneath now makes sense.
I hope to be at Rutland next month which I may just be able to do within the limited mileage that I have left, if i don't get carried away with some driving in this glorious sun that is...

Pete

 

[blade7]

Hope it's dry and you make it to Rutland, I'd like to check out your engine bay. Still interested if the injectors required resistors.

 

[chrisg]

Pete

Hope to meet you at Rutland this year, if and when you upgrade to the 80lb injectors, I'd be happy to take the 55's off you !

Chris

 

[PSH]

hi Chris

I hadn't thought about selling them on...I'm a terrible hoarder for 'just in case scenarios' hell I still have the standard set of injectors, they must have been off the car for more than 10 years now?....If I do manage to fit 80's before Rutland and if I do decide to pass them on I'll let you know...first refusal is yours sir...

Pete

 

[chrisg]

Thank you Sir !

 

[944 turbo cabrio]

If anyone is interested I have a M-Tune set up for gasoline and E85 - included are new injectors.
All new and in box from Rogue...
Price 1000 £ delivered.

Cheers

Niels

 

[PSH]

Hope it's dry and you make it to Rutland, I'd like to check out your engine bay. Still interested if the injectors required resistors.

Hi Paul


finally got some time on the car today, hopefully ready to start tomorrow..we forgot the new LED light boards that my son needs to make up for the binnacle so couldn't start the car, plus battery was flat...lol..

anyway we did get around to testing the injectors...they are indeed low impedance at 2.5 ohms?...so not the 4.7 ohms that Porsche states....I can't remember were I bought these from now but they were certainly from a Porsche specialist so an interesting discovery. Now this could cause the driver chip to overload, it clearly hasn't as the car has had these injectors for at least 11 years with no issues at all and she gets pushed hard? So I may try my other son's 80lb low impedance injectors off his cossie to see how they run....a little R&D ahead it seems...

cheers

Pete

 

[blade7]

Hi Pete,
From what I've read the low impedance injectors only cause problems if they are run near to full duty cycle for prolonged periods, so the larger the injector the less likely the drivers will over heat. Perhaps that's why some tuners dispensed with the ballast resistors for the big injectors, ie the 80lbs that seem the norm now. Maybe send John at Vitesse a message and see what he says ? In any case the 2 resistors seem simple to fit, just 2 wires to splice into near the DME.

Paul.

 

[PSH]

Hi Paul

yes that makes sense..I must remind my son to drop the 80's over....it's only about a 20 minute job to switch the chip jumpers...it will probably take me longer to find John's email with the jumper settings on it...

Pete

 

[blade7]

Let us know how it idles and if there's any noticeable improvement with the 80's Pete.

 

[PSH]

will do Paul...I'm confident that she will idle just as well or better than a standard car... John is particularly good at getting the idle just right....as for improvement I expect a big hike in power, remember the 55 settings were for running in...currently few of the V-MAF+ improvements are active so she's still on standard ignition etc...once the 80's are fitted I can activate the full abilities that V-MAF+ offers over the original V-MAF
Having said all that I'm unlikely to push her hard, I'm getting old these days and have slowed down a lot, perhaps I should sell her and buy a Morris minor...

regards

Pete

 

[blade7]

[] I don't drive really fast as much as I used to on 4 or 2 wheels these days, been there, done that for over 30 years. The chances of an unmarked plod following in/on something you wouldn't expect is too risky. Unless it's over 10 years old or I can check out the driver first I keep under ban speed.

 

[scam75]

[] I don't drive really fast as much as I used to on 4 or 2 wheels these days, been there, done that for over 30 years. The chances of an unmarked plod following in/on something you wouldn't expect is too risky. Unless it's over 10 years old or I can check out the driver first I keep under ban speed.

Ha ha! Not just me then. It's not that I'm paranoid, it's just that everybody is watching!!

Stuart

 

[PSH]

[] I don't drive really fast as much as I used to on 4 or 2 wheels these days, been there, done that for over 30 years. The chances of an unmarked plod following in/on something you wouldn't expect is too risky. Unless it's over 10 years old or I can check out the driver first I keep under ban speed.

Oh I'm very much like that, sounds like Stuart is too......nice and sedate until that red flag is waved and I know it's not the boys in blue...happened early today in fact.....one of those Audi RS things, nice looking car......i won't mention velocity achieved but let's just say I got there extremely quickly and ahead of the other German marque, only a short blast though.....nice dry road long sweeping bends, 3 lanes, I had just come off the on ramp...anyway it was more a road test to check she was behaving since the new pump had been fitted. It's been a bit of a roller coaster in recent days, first head, then water pump, next top hose and lastly fan. Each time I thought the problem had been solved another showed, it's clear now that the pump, head and hose were all leaking in unison....lol The fan played up last night when I took my wife out for a meal, I was beginning to wonder if she would ever play ball , the car that is not my wife.....quick trip to my son's garage this morning sorted the fan ( dodgy multiplug) ...and so this saw me road testing the car when the interlude happened for which I'm grateful as I wouldn't have pushed the car this far without that red flag....hit 64% throttle and 1.1 bar boost.....that's very naughty of me, I hadn't gone over 23% throttle and 0.5 bar since putting the head back on....bad audi....

Pete