Discussion
R5 FRP said:
Kinda getting the impression they are very troublesome.
Especially the 6 speed gear box - very sad really as theNoble is so fantastic in terms of speed, individuality and looks.
Can't help but wonder which forum you are reading then. Who's been complaining about the 6spd?
Anyway have fun browsing lots of good info here.
Nath's talking about the 5 speed! He thinks his 5 speed is on the way out (but actually it hasn't failed), and he's been asking about the 6 speed.
I've never actually known any gearbox fail. Some of the early 5 speeder's had diff problems, but that's all sorted out. The 6 speeder is a very solid box.
Overheating was sorted out ages ago, and affected a very small number of cars. There was a problem with OEM parts - my website tells the story.
You really have nothing to worry about. I had car No. 26 originally, and have recently upgraded to an M400 despite the things going wrong with the early car. Why? Because the service was nothing short of excellent.
Read the forums (go back weeks and months) to get a full picture and you'll be mad not to join the growing number of first time Noble owners!
J
I've never actually known any gearbox fail. Some of the early 5 speeder's had diff problems, but that's all sorted out. The 6 speeder is a very solid box.
Overheating was sorted out ages ago, and affected a very small number of cars. There was a problem with OEM parts - my website tells the story.
You really have nothing to worry about. I had car No. 26 originally, and have recently upgraded to an M400 despite the things going wrong with the early car. Why? Because the service was nothing short of excellent.
Read the forums (go back weeks and months) to get a full picture and you'll be mad not to join the growing number of first time Noble owners!
J
Dear FRP
I concur with Joust - what you see on this forum is not representative - the satisfied owners are out there driving their cars and not at their keyboards. There's only a very few who are unhappy and if you look back at all the "problem" threads from the past they have all petered out as the factory has applied the patches.
Go get one.
Regards
Paul C
I concur with Joust - what you see on this forum is not representative - the satisfied owners are out there driving their cars and not at their keyboards. There's only a very few who are unhappy and if you look back at all the "problem" threads from the past they have all petered out as the factory has applied the patches.
Go get one.
Regards
Paul C
R5 FRP said:Ohh - a racing Puma - lovely car!
We currently own a racing puma, what m12 model would you recommed as the best value for money, range of options etc?
It depends. What's your budget? What are you looking for? If you give us a few ideas we'll be able to give you some pointers.
Also, you can't beat a trip to your local dealer or the factory to get an idea of "what you get for your money", I'd recommend a trip as soon as you can.
J
Like all manufacturers, there are going to be problems with the occassional car, it's just how it is dealt with that matters. I have had good and indifferent service from the factory and from dealers but would never fault their intentions when trying to sort any problems out. I have a 2.5 and had most extras performance wise whrn they became available including the six speed box and exhaust which are definitely recommended. BTW i think the converted 2.5's are better as you can still hear the dump valves!
m12_nathan said:
There are no dump valves 
Don't worry we're solving that one as we speak
Preliminary testing is very positive, the car feels sharper when rapidly on/off throttle and it sounds absolutely gorgeous - a mixture of Grp B rally car and fighter jet on re-heat. Plus there's the obvious turbo insurance.
Notice the valve is fitted with a filter to avoid any possible chance of debris entering the engine should the car be used in dusty environments (or venture into a gravel trap).
Best Regards
Matt
DanH said:
I'd be more interested in a recirc valve as per some of the US owners.
Edited because I found a pic on the Laptop. The above valve has exactly the same internals as our Atmo unit - all the same benefits but makes a noise more akin to a standard car but only from one filter.
Matt
>> Edited by matt_t16 on Monday 28th February 13:18
So recircs still leak air back out of the filters? Doesn't that work against their apparent main advantage of the air having already been metered?
Pics of them from the US forum for people curious :
www.nobleforums.com/showthread.php?t=80
DanH said:
So recircs still leak air back out of the filters? Doesn't that work against their apparent main advantage of the air having already been metered?
Pics of them from the US forum for people curious :
www.nobleforums.com/showthread.php?t=80
Dan,
The 12's don't meter air as such (In so much as they don't have an AMM), they measure volume via MAP (MAP sensor mounted post TB, its the little black box with a 3 wire plug and vacuum/boost connection) as such there is no issue with fueling when dumping boost to atmosphere.
If you utilise a recirc valve then obviously you dump back pre turbo inlet, the volume of air you dump back has to go somewhere, some of it will exit via the filter (how much depends on the posistion of the inlet into the pre turbo induction systems, volume of the pre turbo induction system, speed of compressor wheel and how quickly you re-apply the throttle)
I prefer to use at Atmo valve on a car fitted with a map sensor, afterall if you have a 20 degree ambient why would you want to feed 40 degree air back into the inlet when there is no negative issue by not doing? As for re-circ decreasing lag (when compared to Atmo) I'm unconvinced, when measured on a 2litre 16V lump running 1.8bar of boost from a single turbo there was no difference between an atmo and a recirc valve (aside from a slight increase in charge temp with the recirc valve). Most OEM BOV's on non AMM management are recirc for NVH reasons.
The fitted pics on the US Noble Forums are of a Blitz Atmo BOV.
Best Regards
Matt
lucozade said:
so if this "device" really does benefit the turbo lasting longer why isn't it fitter as standard ?
Standard M12 2.5 runs about 0.35bar boost per turbo, at this speed the compressors are rotating slow enough that stall does not exceed the load rating of the bearings inside the turbos. The noise you hear when lifting off is pressurised charge being forced back through the compressors.
At more extreme boost levels (think 1.5bar+) the rapid deceleration of the compressor/turbine wheels when the throttle plate is closed can damage bearings or even shatter the compressor wheel (RB26DETT engine I know of lost a turbo and a fair bit of engine as a result, although that was running over 1bar and the ceramic compressors are a little fragile at that)
In short the M12 doesn't absolutely need a BOV, however it'd be 'nice' to have one - purely to help minimise turbo lag and (in theory at least) increase the life of the turbos by decreasing the loads present on the bearings.
Best Regards
Matt
>> Edited by matt_t16 on Monday 28th February 15:50
Ok Matt I'm convinced. Dump sounds optimal for the M12. Have you also looked at fitting solid pipes in conjunction with adding the valve? A slighlty cleaner job than the US one pictured would be nice I guess although I don't really know how real an issue the pipes flexing/collapsing really is.
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