flat spot on dyno graph?

fiend · 08-03-2010, 11:52 PM

Any ideas what would be the cause of the flat spot between 4000 - 4250rpm?

The spec is:

1.6 CVH EFi
T3 Turbo
MSD 195 Chip
701 Injectors
Uprated fuel pump
Kent cam and pulley

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Chris69 · 09-03-2010, 07:37 AM

have you got any more details like a the air/fuel graph or boost pressure graph??
just looks like a bit of torque spike to me as the torque drops off at that point then kinda stabilises to produce the power curve.
it is a bit of funny flatspot cus it almost peaks again afterwards lol.

Christian and Beccy · 09-03-2010, 07:48 AM

It probably broke traction. Thats what I'd guess. Or the clutch slipped.

Karlos G · 09-03-2010, 08:12 AM

Yeah if your on a standard clutch it could of slipped when you made peek boost/torque.

fiend · 09-03-2010, 02:19 PM

I haven't got any Air/Fuel or Boost pressure graph, thats all they gave me.

I've got an organic clutch fitted, so shouldn't of slipped? Could it be caused by boost dropping off?

Christian and Beccy · 09-03-2010, 03:10 PM

Proper dyno run needed!!

phil_focus · 09-03-2010, 03:32 PM

could it be the chip not mapped 100% for your engine.

a proper live map would eliminate this.

Christian and Beccy · 09-03-2010, 03:33 PM

Quote:

Originally Posted by phil_focus

could it be the chip not mapped 100% for your engine.

a proper live map would eliminate this.

IMO, no its not that, it's down to the issues I said above.

Rob_DOHC · 09-03-2010, 08:25 PM

Wheel broke traction or clutch slip just as Karlos and Christian said above mate. The second 'bump' is probably a boost spike before the wategate opens etc.

Christian and Beccy · 09-03-2010, 09:13 PM

Second bump is probably the 'pendulum' effect of breaking and regaining traction.

Rob_DOHC · 09-03-2010, 09:41 PM

good point, i thought it could have broken traction opened the waste gate and then closed it again causing a second boost spike when the gate opened for a second time, but yours seems more plausible ie dyno roller catching up with the spinning wheel etcetc.

Rob,

Karlos G · 09-03-2010, 10:09 PM

The monkey operator probably didnt strap it down properly! lol

Rob_DOHC · 09-03-2010, 10:33 PM

You mean like

THIS

fucking norbert.

Karlos G · 10-03-2010, 08:05 AM

lmao yes!!

fiend · 10-03-2010, 03:42 PM

No idea if this helps confirm anything, but I've got a video of one of the runs aswell..

http://www.youtube.com/watch?v=O-a0YyUGoxM

Aslong as its the clutch slipping or it just breaking traction I'm not too worried.

Rob_DOHC · 10-03-2010, 04:31 PM

I can't hear any violent wheel spin or clutch slip......

09-03-2010, 07:37 AM	#2
Chris69 Advanced PassionFord User Garage is empty, add now Trader Score: (0) Join Date: Dec 2004 Posts: 1,952 Rep Power: 9	have you got any more details like a the air/fuel graph or boost pressure graph?? just looks like a bit of torque spike to me as the torque drops off at that point then kinda stabilises to produce the power curve. it is a bit of funny flatspot cus it almost peaks again afterwards lol. __________________

09-03-2010, 07:48 AM	#3
Christian and Beccy #1 in Spelling Club Garage is empty, add now Trader Score: (14) Join Date: May 2003 Location: Norfolk Posts: 23,373 Rep Power: 35	It probably broke traction. Thats what I'd guess. Or the clutch slipped. __________________ Renaultsport Megane F1 230 I've earnt £450 for doing almost nothing!! Click here to see how!!

09-03-2010, 08:12 AM	#4
Karlos G Balls Deep! Garage is empty, add now Trader Score: (4) Join Date: Jan 2007 Location: Suffolk Posts: 7,197 Rep Power: 13	Yeah if your on a standard clutch it could of slipped when you made peek boost/torque. __________________ Zetec Turbo build in progress... For Party DJ's in Suffolk & Essex and AV installs I recommend www.frenzyentertainmentservices.co.uk

09-03-2010, 02:19 PM	#5
fiend Too many posts.. I need a life!! Garage is empty, add now Trader Score: (1) Join Date: Dec 2007 Location: Suffolk Posts: 967 Rep Power: 5	I haven't got any Air/Fuel or Boost pressure graph, thats all they gave me. I've got an organic clutch fitted, so shouldn't of slipped? Could it be caused by boost dropping off? __________________

09-03-2010, 03:10 PM	#6
Christian and Beccy #1 in Spelling Club Garage is empty, add now Trader Score: (14) Join Date: May 2003 Location: Norfolk Posts: 23,373 Rep Power: 35	Proper dyno run needed!! __________________ Renaultsport Megane F1 230 I've earnt £450 for doing almost nothing!! Click here to see how!!

09-03-2010, 03:32 PM	#7
phil_focus PassionFord Post Troll Garage is empty, add now Trader Score: (0) Join Date: Aug 2005 Location: Under the car :cry: Posts: 2,847 Rep Power: 9	could it be the chip not mapped 100% for your engine. a proper live map would eliminate this. __________________ If your not going sideways then your not pushing hard enough!!! ^^^That includes FWD 8) ^^^

09-03-2010, 08:25 PM	#9
Rob_DOHC PassionFord Post Whore!! Garage is empty, add now Trader Score: (4) Join Date: Aug 2009 Location: London Posts: 3,621 Rep Power: 6	Wheel broke traction or clutch slip just as Karlos and Christian said above mate. The second 'bump' is probably a boost spike before the wategate opens etc. __________________ Have a look at my Resto page i need all the help i can get RS Turbo bits for sale click HERE

09-03-2010, 09:13 PM	#10
Christian and Beccy #1 in Spelling Club Garage is empty, add now Trader Score: (14) Join Date: May 2003 Location: Norfolk Posts: 23,373 Rep Power: 35	Second bump is probably the 'pendulum' effect of breaking and regaining traction. __________________ Renaultsport Megane F1 230 I've earnt £450 for doing almost nothing!! Click here to see how!!

09-03-2010, 09:41 PM	#11
Rob_DOHC PassionFord Post Whore!! Garage is empty, add now Trader Score: (4) Join Date: Aug 2009 Location: London Posts: 3,621 Rep Power: 6	good point, i thought it could have broken traction opened the waste gate and then closed it again causing a second boost spike when the gate opened for a second time, but yours seems more plausible ie dyno roller catching up with the spinning wheel etcetc. Rob, __________________ Have a look at my Resto page i need all the help i can get RS Turbo bits for sale click HERE

09-03-2010, 10:09 PM	#12
Karlos G Balls Deep! Garage is empty, add now Trader Score: (4) Join Date: Jan 2007 Location: Suffolk Posts: 7,197 Rep Power: 13	The monkey operator probably didnt strap it down properly! lol __________________ Zetec Turbo build in progress... For Party DJ's in Suffolk & Essex and AV installs I recommend www.frenzyentertainmentservices.co.uk

10-03-2010, 08:05 AM	#14
Karlos G Balls Deep! Garage is empty, add now Trader Score: (4) Join Date: Jan 2007 Location: Suffolk Posts: 7,197 Rep Power: 13	lmao yes!! __________________ Zetec Turbo build in progress... For Party DJ's in Suffolk & Essex and AV installs I recommend www.frenzyentertainmentservices.co.uk

10-03-2010, 04:31 PM	#16
Rob_DOHC PassionFord Post Whore!! Garage is empty, add now Trader Score: (4) Join Date: Aug 2009 Location: London Posts: 3,621 Rep Power: 6	I can't hear any violent wheel spin or clutch slip...... __________________ Have a look at my Resto page i need all the help i can get RS Turbo bits for sale click HERE

10-03-2010, 04:31 PM
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