Xmas ( technical ) quiz !
24 December 2008, 07:55 PM
#1
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Xmas ( technical ) quiz !
If you like a challenge....
Have a look in View my Scoob, please !
Take a look at my BHP /Torque and AFR/boost printouts from the last RR day !
Then tell me what's wrong !
Merry Crimbo !
dunx
Have a look in View my Scoob, please !
Take a look at my BHP /Torque and AFR/boost printouts from the last RR day !
Then tell me what's wrong !
Merry Crimbo !
dunx
24 December 2008, 08:16 PM
#3
Just a guess...
You're making max power by c.4,800rpm then it seems to drop away sharply? Surely power should peak, or at least be maintained, to at least about 6,000rpm no?
Is it a diesel? lol
Plus, you haven't exactly got a flat torque curve
You're making max power by c.4,800rpm then it seems to drop away sharply? Surely power should peak, or at least be maintained, to at least about 6,000rpm no?
Is it a diesel? lolPlus, you haven't exactly got a flat torque curve
Last edited by joz8968; 24 December 2008 at 08:19 PM.
24 December 2008, 09:29 PM
#7
At 4,200-4,600rpm, the A/F is at low MAP pressure - is this something to do with running lean at this part of the rev range, therefore boost cut, hence the low MAP reading?
If this is right, I'll be well annoyed, as this was my very first thought
lol
If this is right, I'll be well annoyed, as this was my very first thought
lol
Last edited by joz8968; 24 December 2008 at 09:31 PM.
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25 December 2008, 03:23 PM
#10
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No ! It's meant as a bit of fun, I know the answer, but that's cheating...
LOL
dunx
P.S. No boost cut, as it reaches 1.6 bar comfortably !
LOL
dunx
P.S. No boost cut, as it reaches 1.6 bar comfortably !
25 December 2008, 06:22 PM
#14
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I think reason why power and torque seem to follow is because run was aborted, by the quiz reason....
AFR seem reasonably ok until boost falls. There is a momentary regain of boost before it falls again.
Did the BOV fail and when boost fell it started to close again but by then run was already aborted by you/techincan? Or is it same but a hose sprang a leak but started to close up but by then....
As I know fuel was ok and engine is still in one piece
AFR seem reasonably ok until boost falls. There is a momentary regain of boost before it falls again.
Did the BOV fail and when boost fell it started to close again but by then run was already aborted by you/techincan? Or is it same but a hose sprang a leak but started to close up but by then....
As I know fuel was ok and engine is still in one piece
25 December 2008, 07:16 PM
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Almost always run on V-Power + octane booster !
The run was "set" to stop at 5k rpm as I suspected a fault !
I wasn't even in the dyno cell at the time, so I'm not to blame.... however it is true that I can't drive
LOL
dunx
The run was "set" to stop at 5k rpm as I suspected a fault !
I wasn't even in the dyno cell at the time, so I'm not to blame.... however it is true that I can't drive
LOL
dunx
Last edited by dunx; 25 December 2008 at 07:18 PM.
25 December 2008, 08:46 PM
#19
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Oh ! what the hell...
At 4800 rpm the AFR spikes vertical !
A couple of hundred more would have melted a piston !
The answer is....
Fitted a bigger turbo, but hadn't got to a mapper, so was just checking things out !
Glad I didn't go over 4500 rpm !
Merry Xmas !
And thanks to all for taking part, hope this filled a little of your day !
dunx
At 4800 rpm the AFR spikes vertical !
A couple of hundred more would have melted a piston !
The answer is....
Fitted a bigger turbo, but hadn't got to a mapper, so was just checking things out !
Glad I didn't go over 4500 rpm !
Merry Xmas !
And thanks to all for taking part, hope this filled a little of your day !
dunx
26 December 2008, 04:52 PM
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26 December 2008, 06:20 PM
#24
Originally Posted by joz8968
You're making max power by c.4,800rpm then it seems to drop away sharply?
(it was a bit tenuous for people to guess that a turbo had been changed 
)Or am I talking cr@p?
26 December 2008, 09:10 PM
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I don't get it, the afr rushes up at just the revs where the run was aborted.
Boost rised evenly with good afr, it only leans out when boost falls, doesn't it?
Boost rised evenly with good afr, it only leans out when boost falls, doesn't it?
26 December 2008, 10:27 PM
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Looks like a good bit of work needs doing on the boost control valve. Are you going to fit a 3 port boost solenoid prior to re-map as this will give better control.
Last edited by 360ste; 26 December 2008 at 10:28 PM. Reason: to much christmas spirit
26 December 2008, 11:21 PM
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Actually Craig at MRC in Leeds swears by the Perrin one as an esential mod !
The engine may well become a 2.1 stroker next month !
LOL
dunx
The engine may well become a 2.1 stroker next month !
LOL
dunx
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