its runninggggggggg

[bushyg40]

after 2  years and 2 month and grand later my 40 is running revs too over 8 grand awsome alls next is mot and thas it on the road

[breadman]

Over 8 grand!! What's the point in revving it that high? The charger won't like it, especially if it's got a smaller pulley and it's way past peak power anyway.
Take it easy mate. Good luck with the MOT.

[bushyg40]

iv rebuilt it all proply and worked out the calculations

[PeteG40]

which bearings did you use on the pulley countershaft?

[bushyg40]

i got the rebuild kit from bartek

[Richg40]

charger bearings with metal seals? It's the future.

[PeteG40]

metal seals/rubber seals - all have same rpm raneg -
even the bartek ones, which i presime are justbearing with better grease and viton seals most probably have same rev range.

are you using solid lifters?

[liam]

so what is the point in people making and selling ecu chips that go over 8000 rpm for g40s if its just gonna blow the charger

[Richg40]

metal seals/rubber seals - all have same rpm raneg -
even the bartek ones, which i presime are justbearing with better grease and viton seals most probably have same rev range.

are you using solid lifters?

Not according to my catalogue they dont. Bearings I use offer a 6k rpm increase over standard rubber seals.

[Puncharado]

And what is that higher RPM limit Rich? What size pulley are you using bushy? If my quick sums are right, with a 65mm pulley at 8k engine speed the charger will be knocking on the door of 15k rpm.

[bushyg40]

65mm pulley i think its something like 15600 have too find the paper and well if it goes bang it goes bang witch i know it wont at least i tried something different and didnt stick to the norm that every one dose

[PeteG40]

normal countershaft bearings have a safe limit to 12,600 rpm if i remember correctly.

True Richg40 - the metal ones do have a higher limit, which i was unaware of - however, generally they have gap seals. not lip seals - so i believe most lader rebuilders dont use them as they dont seal as welland are more likely to spunk their grease out and let shit in as far as i'm aware.  And as they are inside a lader you can't see them if they have!


charger aside - the 8krpm, will need solid camlifters to avoid float and it'll need a new map sensor and remapping to work effectively - as anything overabout 1.2 bar andthe stock map sensor goes spazzy

[hardchargin40]

Been there, done that, built the engine, destroyed any charger that was on it, even on a stock pulley and vee belts!  couldn't handle the RPM and how quick it would rev to get there, including heel n toe downshifting.  Hence a turbo conversion was on the cards.

[dub-disaster]

Do you realy gain all that much from revving your engine that high? Can't be good for reliabilty or longevity of the engine I'm thinking but I don't know half as much as these guys do.

[hayesey]

so what is the point in people making and selling ecu chips that go over 8000 rpm for g40s if its just gonna blow the charger

the original reason was simply to move the rev limit up out of the way so you wouldn't hit it.  Hitting the hard-cut rev limit causes a sudden decrease in rpm which isn't good for the charger at all, so PSD set rev limit to 8k rpm so it was well out of the way and then it was up to the driver to keep a better eye on revs. 

Then on top of that, big numbers sell parts....

Sure you can build an engine to withstand 8k and tune it to make power up there but I'd not want to do it with a g-lader and you should also convert to solid lifters too or there is a risk of valve float at much past 7k rpm.