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Drag Racing Discuss Drag Racing here be it dirt or tarmac. Sponsored by Sydney Dragway. |
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#1 | ||
Regular Member
Join Date: Jan 2007
Location: Rocky
Posts: 429
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Crewing for a mates Supercharged BA at the Perth Motorplex yesterday. Cars been running high 11s no problem. Not changed anything but for some reason the car wouldn't run any better than a 13.5 yesterday. As min dial in is a 12.99 we were out 1st run. The air was really bad. But 3 seconds, no way. Now heres the rub. The meeting was abandoned as there was a power pole fire and there were no lights at the Plex. Is been rescheduled for the 2nd but nowhere is open. Just wondering if anyone had any ideas what we could do. Have not re flashed the car as the owner (not me) has no idea if the tuner has the latest tune in it or not. I suppose at this point we have nothing to loose by trying.
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#2 | ||
FF.Com.Au Hardcore
Join Date: Jul 2006
Posts: 7,331
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Did the MPH drop too?
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#3 | ||
Regular Member
Join Date: Jan 2007
Location: Rocky
Posts: 429
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yes it just didn't want to rev
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#4 | ||
Regular Member
Join Date: Sep 2009
Posts: 103
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cat convertors blocked
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A.P.S. Service Centre A.P.S. Performance Tuning www.apsperformancetuning.com.au www.apsservicecentre.com.au |
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#6 | ||
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Location: Rocky
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#7 | ||
FF.Com.Au Hardcore
Join Date: Feb 2005
Location: Pit Lane
Posts: 11,867
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what charger and what is it tuned with?
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Pit Lane Performance 20 Rosella St Frankston 03 9783 8122 Authorised Streetfighter, Pcmtec , SCT & HP Tuners Tuning Agent,
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#8 | ||
Regular Member
Join Date: Jan 2007
Location: Rocky
Posts: 429
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Is a vortech S/D 13 lb of boost running on that E85 fuel. its only just been retuned to run on the E85 before the last time out. So we don't know if the flash tune is for E85 or 98 Octane. So until BPT re open we are a bit relucent to do a flash tune
Last edited by Poorboy_racer; 29-12-2014 at 11:46 PM. Reason: added more info |
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#9 | ||
FF.Com.Au Hardcore
Join Date: Feb 2005
Location: Pit Lane
Posts: 11,867
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which flash box do you have, Xcal 3 can tell you what the last loaded tune was. If you were running E85 in the tank but had 98 octane map loaded, the car would be very lean, have you looked at the fuel trims?
Is the belt slipping?
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Pit Lane Performance 20 Rosella St Frankston 03 9783 8122 Authorised Streetfighter, Pcmtec , SCT & HP Tuners Tuning Agent,
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#10 | ||
Regular Member
Join Date: Jan 2007
Location: Rocky
Posts: 429
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Quite sure the charger belts not slipping. The flash tuner is a CAPA ford Flash two.
Fuel trims? |
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#11 | ||
Regular Member
Join Date: Jan 2007
Location: Rocky
Posts: 429
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Watched this : https://www.youtube.com/watch?v=5WnM_NsOtd8
and part 2 . Very interesting explanation of fuel trims. Any thoughts on how the O2 sensor will react for forced induction? We have been informed that the re-scheduled meeting will continue from where the abandoned meeting left off. So we are knocked out anyway. No panic now, we can wait for BPT to reopen before our next meeting on the 9th Jan so we should have time to get it fixed. Appreciate the comments and suggestions anyway and learnt a bit about fuel trims. ![]() |
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#12 | ||
FF.Com.Au Hardcore
Join Date: Feb 2005
Location: Pit Lane
Posts: 11,867
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o2 sensor should not be affected by forced induction at all, the SC 5.0 and turbo 6's have no issues
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Pit Lane Performance 20 Rosella St Frankston 03 9783 8122 Authorised Streetfighter, Pcmtec , SCT & HP Tuners Tuning Agent,
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#13 | ||
Regular Member
Join Date: Jan 2007
Location: Rocky
Posts: 429
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Was thinking that as the O2 sensor monitors the exhaust gasses coming out of the engine after combustion, forced induction should make no difference if they monitored the air going in before combustion then that would be different story. The MAF sensor has been changed.
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#14 | ||
FF.Com.Au Hardcore
Join Date: Feb 2005
Location: Pit Lane
Posts: 11,867
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A BA does not have a MAF sensor
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Pit Lane Performance 20 Rosella St Frankston 03 9783 8122 Authorised Streetfighter, Pcmtec , SCT & HP Tuners Tuning Agent,
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#15 | ||
FF.Com.Au Hardcore
Join Date: Feb 2013
Posts: 917
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Could it have been a bad batch of fuel?
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#17 | ||
Regular Member
Join Date: Jan 2007
Location: Rocky
Posts: 429
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Cars gone back to BPT now. They are saying drastic drop in boost but we don't know why at the moment. They are looking into it.
Map.....Maf......typo, As said earlier its not my car. I didn't get, or do any of the work done on it. I just check the fuel level, tyre pressures, dial ins etc. Therefore I can only relay information given to me by the owner. |
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#18 | ||
Regular Member
Join Date: Jan 2007
Location: Rocky
Posts: 429
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Turns out there was a large crack in the pipe between the supercharger and throttle body. New pipework fitted its all good now. Thanks for the suggestions.
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