Monday, December 17, 2007 - 10:19 pm, by: Rob Rojo(Rob_tt)
When changing through gears (auto) usually at high rpm, the car backfires. I have checked coil packs and replaced the plugs but no change. Any ideas???
Monday, December 17, 2007 - 10:43 pm, by: Brian Timms(Turbo_brian)
The Soarers retard the engine timing during gearchange, causing a 'burble' sort of sound, it's to redude the sudden amount of torque and power the gearbox is subjected to in the next gear to try and limit tire chirp and stress on the drive-line.
completely normal, although not noticed as much on stock exhaust, definately noticable on a cannon or other aftermarket exhaust systems.
Tuesday, December 18, 2007 - 08:26 am, by: Lew Radbourn(Marlew)
The only way to reduce the miss fire when gears are changing is to shift kit the box that way you reduce the time to change gears and there are other important factors that the shift kit helps. Mv's 08 83700430 in Adelaide talk to Michael, thay do the best shift kit available for our boxes i have had several auto trans places up here on the coast tell me that thay are impressed with the shifting
Tuesday, December 18, 2007 - 10:02 am, by: Rob Rojo(Rob_tt)
Thanks, It was not noticeable until the exhaust was changed to a sports system. I was looking at getting a shift kit, this will just speed the process up.
Wednesday, December 19, 2007 - 09:08 am, by: Lew Radbourn(Marlew)
Alen as i said above it REDUCES the miss fire with a standard ECU in the car you will always have a miss fire between gears. as stated above the standard ECU retards the timing between gear changes the more power applied the more it retards. the only way to REDUCE it is to get it into the next gear quicker so it cuts the time down between gears. or replace the ECU with one that runs the engine by its self on a hot day you shouldn't be giving your car a hard time any way that is a sure thing you are going to melt some things for starters pistons are under heaps of pressure then having a turbo place even more pressure as well then add some extra heat to the mix and you have a receipy for disaster
Brian Timms DieHard New South Wales TT Soarer Goodness.
Wednesday, December 19, 2007 - 09:48 am, by: Brian Timms(Turbo_brian)
Rob Rojo wrote on Tuesday, December 18, 2007 - 10:25 pm:
I will still get the shift kit just to make sure!
If your shift-kitting the car, also look at an external oil cooler for the gearbox.
Shift kit means more gearbox oil pressure, more pressure means more heat, more heat means premature wear, or you get an oil cooler to control the heat increase As Lew has said, you will never get rid of the retarding gear changes completely unless you remove the cause from the equation.
The cause happens to be the ECU, which retards the motor during gearchange to extend the life of the box, and reduce sudden power pressures, unless you swap out the ECU for a Power FC, Emanage or similar fully aftermarket ECU, you wont completely remove the retarding feature.
Also, as Lew has said, pushing your car on a hot day is asking for trouble, turbocharged cars love COLD temperatures, and reduced heat, and as the Soarers already run fairly warm, pushing them hard on a hot day isn't going to do you any favours.
Wednesday, December 19, 2007 - 09:05 pm, by: Rob Rojo(Rob_tt)
Thanks for all of your help. I have just started another thread about error code 61 ( no.2 speed sensor) so I you have any ideas how to fix please have a look.
Thursday, December 20, 2007 - 11:49 pm, by: Shane Bradley(Endless)
Try turning your auto line pressure cable all the way up if you are still getting some audible backfire on gear changes after fitting a stage 1.5 shiftkit.
I have this kit on my JZA70 supra and it stopped it completely... instead of a burble/backfire i get a squeal and a bit sideways briefly down the street.
Previous
