Dead and Gone

at top speed?

Was reading a few posts and was wondering this, a saph's top speed is 150 when it left the factory right? well if you had a say stage 3 setup and sat at 150 how long before it went bang? or should it last forever as long as fuel was good?

R4N SS

iTrader: (6)

mine didnt last long

Dead and Gone

was that because fueling was crap or something else?

R4N SS

iTrader: (6)

i think it was more becuase i was on and off the gas trying to get the bike outta my way

SPADGE

It would depend on how good the mapping is in the chip!
The piston crowns would get very hot on a weak map and would no doubt melt before long!

Dead and Gone

ok say the map is very good (one of Stu's?) and fueling was perfect? Would that mean you could sit there at 150 without problem or are there weak points in the engine that would fail?

SPADGE

If it was mapped correctly for top end and if the engine was in good order i would guess it would keep going until it ran out of fuel

Phil

iTrader: (1)

I reckon the oil would get too hot and thin if you held it for ages!

marcos

you could say this about any engine though

frog

Doesn't the manual say something like "max continuous rev/min 6500" ?

That would suggest that the engine can run at max revs continuously and reliably

SS1

iTrader: (3)

thats why i love mine only a bus to work runs fast Modified but no major
prices apart from the tyres did 120 ish to conway on monday
all the way
ok thats not fast but AA is not needed
love that "road angel "thing "
best ever buy on ebay

Sticky.

iTrader: (4)

I'll let you no how long mine lasts next week Jay, new engine will be in at the weekend & then off to Karls to be mapped

Mike Rainbird

iTrader: (3)

I have had a stage 1 chipped car at 6500rpm on 17s for 6 miles (but this WAS in the days of the old 98RON).

My current car is mapped so that it could be held flat out for the length of Brunters twice in succession, on the third time round, there was the faintest hint of det (not sufficient to cause any problems or require any changes). However, I was told that if I went round a fourth time without letting it cool down, that some adjustments would be required on the top line (adding fuel / taking out ignition). Given that this equated to 170mph speeds, I left it as it was, as I couldn't imagine ever holding those speeds for any significant periods.

Stu @ M Developments

iTrader: (12)

The problem that commonly arrises at these speeds is:

1) Heat build up in the head due to EGT.
2) Heat build up in engine due to inadequate cooling.
2) Heat build up in the piston and rod due to insuficient oil quantity.

As Far as mapping goes, the system is operfectly capable of requiring stable and safe fuel and spark strategies, its the rest of the vehicle that usually lets them down.

Porkie

iTrader: (1)

I know its far from standard and therefore irrelevant for this thread But I had martins Escort well over 150mph for a LONG while on the Gumball and we noticed the gearbox started to get very hot and was getting louder and louder so I slowed down for a bit!

James

What actually gets on in the gearbox, the oil?

Would it not be possible to somehow fit a gearbox oil cooler?