backfire on boost
02-11-2006, 10:41 AM
#1
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backfire on boost
got a prob with my s2 rst when it comes on boost it stop's suddenly like i just hit a brick wall,backfires then pick's up again? could it be a fueling prob? its bn chiped/standard intercooler peaks bout 16psi and holds bout 10. if thats any help, cheers 
02-11-2006, 10:54 AM
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Hi mate has it only done this recently or for a while?
Could be something on the ignition side breaking down,
As its getting really cold now it may of overboosted but that maybe
unlikley, feels like its backfiring but useally a little more violent
Could be something on the ignition side breaking down,
As its getting really cold now it may of overboosted but that maybe
unlikley, feels like its backfiring but useally a little more violent
02-11-2006, 01:09 PM
#5
Even if it has been chipped, its possible that the boost-cut hasn't been removed altogether. Some raise it to 18psi and it could be hitting that due to a boost spike, probably the result of a weak/poorly adjusted actuator.
That's where my money would be.
That's where my money would be.
02-11-2006, 01:10 PM
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Originally Posted by Christian and Beccy
Even if it has been chipped, its possible that the boost-cut hasn't been removed altogether. Some raise it to 18psi and it could be hitting that due to a boost spike, probably the result of a weak/poorly adjusted actuator.
That's where my money would be.
That's where my money would be.
02-11-2006, 01:13 PM
#7
Originally Posted by SafeChav
Originally Posted by Christian and Beccy
Even if it has been chipped, its possible that the boost-cut hasn't been removed altogether. Some raise it to 18psi and it could be hitting that due to a boost spike, probably the result of a weak/poorly adjusted actuator.
That's where my money would be.
That's where my money would be.
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02-11-2006, 01:16 PM
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Originally Posted by Christian and Beccy
Originally Posted by SafeChav
Originally Posted by Christian and Beccy
Even if it has been chipped, its possible that the boost-cut hasn't been removed altogether. Some raise it to 18psi and it could be hitting that due to a boost spike, probably the result of a weak/poorly adjusted actuator.
That's where my money would be.
That's where my money would be.
09-11-2006, 12:57 PM
#9
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its only started doing this since i fitted the new actuator, i ajusted the timeing by moveing the dizzy yesterday it seams better now it only seams to do it in 3rd gear when i get to bout 80mph.
you've probably set the boost too high if you've put a new actuator on
11-11-2006, 12:12 PM
#13
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Originally Posted by ShandzS1
U lads mite know.....my s1 is pinking when it comes on boost on hard throttle, any ideas???
Keep at it, and u'll have no engine left...
11-11-2006, 06:04 PM
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You shouldn't really re-bore and use standard pistons, especially the amount you would of honed to remove the wear etc.
You've got to remeber the next size pistons up are 0.5mm oversize.......that soon gets used up in honing
You've got to remeber the next size pistons up are 0.5mm oversize.......that soon gets used up in honing
11-11-2006, 06:31 PM
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Well its off the road at the end of the month, so the engine will be out and down 2 the local engineers to get measured up n see wot i need, there was a guy on here selling re-bored s2 block and new 0.5 pistons for £400, but realy want to keep original block..... as its totaly standard and only done 72k
12-11-2006, 02:01 PM
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Mileage doesnt necessarily reflect anything as you are proving.....its only done 72k...........a very hard 72k by the sounds of it!
A well looked after and maintained engine should be seeing a lot more than that
A well looked after and maintained engine should be seeing a lot more than that
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