nelsonian101 Donating Members 961 Member For: 16y 8m 12d Gender: Male Location: Sydney Posted 12/07/10 08:50 AM Share Posted 12/07/10 08:50 AM I recently had my car dyno tuned for the first time with the CAPA SCT flasbox.3 tunes. Valet, Economy and 98.When running the 98 tune, under heavy acceleration the car is intermittently losing power for a fraction of a second/backfiring on and off a few times per second if this makes sense.The tyres aren't spinning/regaining grip and the diff is fine and well serviced.Car is a FGXR6T. Only engine mods are XR8 intake snorkel and K&N filter, 5" 100cpi cat and the FG alloy intercooler piping mod. Injectors are stock.It made 276rwkw on the conservative 98 tune and I will be calling the tuner tomorrow.Any ideas why it is losing power? Link to comment Share on other sites More sharing options...
PHANTMXR6 It's not a MKI! Member 1,742 Member For: 16y 8m 18d Gender: Male Location: Earth Posted 12/07/10 08:53 AM Share Posted 12/07/10 08:53 AM Is it backfiring or just feeling like it is dropping powere on and off again?Could be a bad batch of fuel. Link to comment Share on other sites More sharing options...
nelsonian101 Donating Members 961 Member For: 16y 8m 12d Gender: Male Location: Sydney Posted 12/07/10 09:09 AM Author Share Posted 12/07/10 09:09 AM For example, under hard acceleration in 3rd, the power is cutting in and out and loud burbles are heard out of the exhaust.This is the first time I have accelerated the car hard since the tune late last week (as it has been raining/peak hour traffic etc), so this is the first time I have really tested it, hence I don't think it is the fuel.The car has been run on 98 since new. Link to comment Share on other sites More sharing options...
icer Banned 2,335 Member For: 15y 7m 20d Gender: Male Location: Aspendale, Vic. Posted 12/07/10 09:22 AM Share Posted 12/07/10 09:22 AM fuel surging? Link to comment Share on other sites More sharing options...
bossmang FREAKY Donating Members 12,439 Member For: 15y 2m 12d Gender: Male Location: Melbourne Posted 12/07/10 09:26 AM Share Posted 12/07/10 09:26 AM id pay the tuner a friendly visit and let them know maybe? Link to comment Share on other sites More sharing options...
jimmy1234 Donating Members 364 Member For: 17y 1m 2d Gender: Male Posted 13/07/10 06:37 AM Share Posted 13/07/10 06:37 AM My car used to do something similar, more so on the shift from 2nd to 3rd it would drop power and backfire.... Soon after it spat a rod, I soon after changed tuners... Link to comment Share on other sites More sharing options...
Rosie Member 361 Member For: 17y 11m 2d Posted 13/07/10 07:08 AM Share Posted 13/07/10 07:08 AM When did you last change your Plugs?The 'only' time I ever got backfiring was under hard acceleration and this turned out to be hammered Plugs! Link to comment Share on other sites More sharing options...
nelsonian101 Donating Members 961 Member For: 16y 8m 12d Gender: Male Location: Sydney Posted 13/07/10 10:52 AM Author Share Posted 13/07/10 10:52 AM The plugs were changed about 10,000kms ago. Visiting the tuner later this week. Would the 100cpi 5" cat have anything to do with it? Link to comment Share on other sites More sharing options...
nelsonian101 Donating Members 961 Member For: 16y 8m 12d Gender: Male Location: Sydney Posted 23/07/10 09:03 AM Author Share Posted 23/07/10 09:03 AM Had the plugs replaced with some cheaper Ford ones and problem gone. Link to comment Share on other sites More sharing options...
Gee Member 131 Member For: 15y 10m 22d Gender: Male Location: Melbourne Posted 23/07/10 09:40 AM Share Posted 23/07/10 09:40 AM Maybe the knock sensors are not back off enough Link to comment Share on other sites More sharing options...
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