Xmas ( technical ) quiz !

Reply Subscribe

Thread Tools

Search this Thread

Dec 24, 2008 | 07:55 PM

dunx

Thread Starter

Scooby Senior

iTrader: (3)

Joined: Jun 2006

Posts: 14,333

Likes: 0

From: Slowly rebuilding the kit of bits into a car...

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

Dec 24, 2008 | 08:05 PM

Ian

Scooby Regular

iTrader: (10)

Joined: Jul 2005

Posts: 7,845

Likes: 1

From: Cambridge

loadsa lag, and only goes up to about 5k?

Dec 24, 2008 | 08:16 PM

joz8968

Scooby Regular

iTrader: (13)

Joined: Aug 2006

Posts: 23,764

Likes: 9

From: Leicester

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

Last edited by joz8968; Dec 24, 2008 at 08:19 PM.

Dec 24, 2008 | 08:30 PM

sponners

Scooby Regular

iTrader: (4)

Joined: Oct 2004

Posts: 954

Likes: 0

From: powys

run aborted?....knocking?.....too lean?

late boost....boost leak?

Dec 24, 2008 | 09:08 PM

STiFreak

Scooby Regular

iTrader: (4)

Joined: Jan 2006

Posts: 905

Likes: 0

It's weird how the power and torque curves follow so closely.

Looking at your boost and AFR curves, I think it might have overboosted and hit fuel cut?

Dec 24, 2008 | 09:08 PM

dunx

Thread Starter

Scooby Senior

iTrader: (3)

Joined: Jun 2006

Posts: 14,333

Likes: 0

From: Slowly rebuilding the kit of bits into a car...

Good so far, sponners is closest !

LOL

dunx

Dec 24, 2008 | 09:29 PM

joz8968

Scooby Regular

iTrader: (13)

Joined: Aug 2006

Posts: 23,764

Likes: 9

From: Leicester

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

Last edited by joz8968; Dec 24, 2008 at 09:31 PM.

Trending Topics

2009 Spec C

342

38.4k
Impreza for Sale?

4

198
Barn find 330S

2

140
Looking for my dad's old 4-door 22B Type UK - L4 LJD (Originally R866 LGF)

2

137
alloy diff guard NOT genuine prodrive

127

19.7k

Dec 25, 2008 | 01:34 PM

dunx

Thread Starter

Scooby Senior

iTrader: (3)

Joined: Jun 2006

Posts: 14,333

Likes: 0

From: Slowly rebuilding the kit of bits into a car...

Will let this run until Boxing Day...

Have fun !

dunx

Dec 25, 2008 | 03:11 PM

joz8968

Scooby Regular

iTrader: (13)

Joined: Aug 2006

Posts: 23,764

Likes: 9

From: Leicester

lol How to keep a bunch of idiots in suspense! lol

Dec 25, 2008 | 03:23 PM

#10

dunx

Thread Starter

Scooby Senior

iTrader: (3)

Joined: Jun 2006

Posts: 14,333

Likes: 0

From: Slowly rebuilding the kit of bits into a car...

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 !

Dec 25, 2008 | 04:43 PM

#11

psigeek

Scooby Regular

iTrader: (17)

Joined: Oct 2007

Posts: 1,175

Likes: 0

Er fuel pressure dropped?

Dec 25, 2008 | 05:03 PM

#12

Fizz

Scooby Regular

iTrader: (1)

Joined: Jul 2000

Posts: 1,813

Likes: 3

From: Stourbridge

engine dumped it's bits all over the place

Dec 25, 2008 | 05:06 PM

#13

dunx

Thread Starter

Scooby Senior

iTrader: (3)

Joined: Jun 2006

Posts: 14,333

Likes: 0

From: Slowly rebuilding the kit of bits into a car...

No Defi's say 3.5 bar differential, so relax !

And it's still running... Fizz

LOL

dunx

Dec 25, 2008 | 06:22 PM

#14

Adam K

Scooby Regular

Joined: Sep 2007

Posts: 239

Likes: 0

From: Stockholm, Sweden

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

Dec 25, 2008 | 07:03 PM

#15

subaruturbo_18

Scooby Regular

Joined: Sep 2007

Posts: 2,785

Likes: 0

From: England

Its not running on V-power so caused det?

Hose burst?

You cant drive (even on a rolling road)

Last edited by subaruturbo_18; Dec 25, 2008 at 07:12 PM.

Dec 25, 2008 | 07:08 PM

#16

TonyBurns

Scooby Regular

iTrader: (3)

Joined: Aug 2000

Posts: 25,565

Likes: 2

From: 1600cc's of twin scroll fun :)

Quote:

Originally Posted by sponners

run aborted?....knocking?.....too lean?

late boost....boost leak?

Split boost pipe?

Tony

Dec 25, 2008 | 07:16 PM

#17

dunx

Thread Starter

Scooby Senior

iTrader: (3)

Joined: Jun 2006

Posts: 14,333

Likes: 0

From: Slowly rebuilding the kit of bits into a car...

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

Last edited by dunx; Dec 25, 2008 at 07:18 PM.

Dec 25, 2008 | 07:39 PM

#18

joz8968

Scooby Regular

iTrader: (13)

Joined: Aug 2006

Posts: 23,764

Likes: 9

From: Leicester

Quote:

Originally Posted by dunx

...The run was "set" to stop at 5k rpm as I suspected a fault...

Is this the answer then?

Dec 25, 2008 | 08:46 PM

#19

dunx

Thread Starter

Scooby Senior

iTrader: (3)

Joined: Jun 2006

Posts: 14,333

Likes: 0

From: Slowly rebuilding the kit of bits into a car...

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

Dec 25, 2008 | 09:59 PM

#20

mystic_magic

Scooby Regular

Joined: Sep 2004

Posts: 383

Likes: 0

From: Isle of Wight

Is it the graph is fake? lol

Dec 26, 2008 | 12:17 AM

#21

dunx

Thread Starter

Scooby Senior

iTrader: (3)

Joined: Jun 2006

Posts: 14,333

Likes: 0

From: Slowly rebuilding the kit of bits into a car...

no fake

Dec 26, 2008 | 04:52 PM

#22

subaruturbo_18

Scooby Regular

Joined: Sep 2007

Posts: 2,785

Likes: 0

From: England

Quote:

Originally Posted by dunx

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

i demand half credits. lol

Dec 26, 2008 | 05:43 PM

#23

Fizz

Scooby Regular

iTrader: (1)

Joined: Jul 2000

Posts: 1,813

Likes: 3

From: Stourbridge

so I COULD have been right

Dec 26, 2008 | 06:20 PM

#24

joz8968

Scooby Regular

iTrader: (13)

Joined: Aug 2006

Posts: 23,764

Likes: 9

From: Leicester

Quote:

Originally Posted by joz8968

You're making max power by c.4,800rpm then it seems to drop away sharply?

Plus, I wasn't exactly a million miles off

(it was a bit tenuous for people to guess that a turbo had been changed

)

Or am I talking cr@p?

Dec 26, 2008 | 09:10 PM

#25

Adam K

Scooby Regular

Joined: Sep 2007

Posts: 239

Likes: 0

From: Stockholm, Sweden

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?

Dec 26, 2008 | 09:59 PM

#26

dunx

Thread Starter

Scooby Senior

iTrader: (3)

Joined: Jun 2006

Posts: 14,333

Likes: 0

From: Slowly rebuilding the kit of bits into a car...

Tenuous, but then it was a quiz....

HA ha ha

evil dunx

Dec 26, 2008 | 10:27 PM

#27

360ste

Scooby Regular

iTrader: (1)

Joined: Apr 2005

Posts: 2,892

Likes: 0

From: In the Flatlands of Lincolnshire

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; Dec 26, 2008 at 10:28 PM. Reason: to much christmas spirit