detonatiing like crazy...
03-02-2008, 12:38 PM
#1
Member
Thread Starter
Join Date: Sep 2007
Location: Holland
Posts: 89
ok guys, i have a major problem with my car (Project-thread) and need some help or idea's. please read the following carefully before posting...!
to make a long story short, tuning my car didn't go as hoped...
i'll try to describe the problems the best i can, hoping you will do some serious thinking with me, seeing that myself and the guys who were tuning my car, don't have any clue on what the hell is going on!
it all starts about 1 year ago when i had some hesitation, and went to my rotary specialist to figure out the problem. it turned out to be a malfunctioning MAF. but in the process of finding the problem we had some hoses changed or unplugged to raise boost. then it hit 0,6bar with no problems or strange noises, we changed it all back to factory boost level. i can remember this: it felt a LOT quicker!
when i started to work on the car last september, the engine was still stock, i had just removed the power steering and A/C, and put on the racingbeat sparkplugs. then i took it for a spin and heard a strange noise coming from the engine and went to check it all out. it sounded like a ticking noise when i hit full boost (stock 0,5bar)
started searching, not knowing what it could be and then i found my fucked up turbo and thought that was it...
last friday i went to a company, who races FC's here in Holland, to get the car tuned.
we started out removing the factory fuel-cut and adjusting fuel @ stock boost (a lower 0,35-0,4bar due to my ported wastegate), no problems there.
all went well and we could be turning up the boost a little.
then all of a sudden, at just 0,5bar, again the same sound! they told me it was detonating like crazy... sounded like someone banging on the floor with a hammer!
we tried many things to figure out where it was coming from, but no luck.
mixture is fine, timing was at zero.
when we advanced the timing a lot, detonation no longer occurred, and we hit 0,9bar.
but then the timing was probably so advanced, that it did not really produce any more power.
they have tried building an engine with non-turbo rotors once and got about the same results.
detonating like crazy on just 0,4-0,5bar
so we compared it to a turboII engine they had, measuring the distance from the plughole to the rotors, they were pretty much the same (a bit hard to measure with the engine in the car) but not that much that it would indicate there would be the wrong rotors in my engine.
that was also almost impossible, due to the fact that i have hit 0,6bar before without any problems.
did a compression test: 6bar on both rotors and all the chambers, which is even a bit on the low side perhaps.
checked the plugs, coils, leads. they all work properly. even put on a stock pair of plugwires instead of the racing beat wires, but with those, the problem was probably even worse!
we decided to stop progress at this point and try to figure out what the problem is before we start spitting out apex seals...! at stock boost there is no problem at all, so i can run it safely for the moment.
so this strange problem was there a long time ago, and all my mods did not affect it and did not make it worse. so it would be safe to say those mods dont have anything to do with it and can be ruled out...
if anyone has any thoughts on this. dont hesitate to let me know!](Project-thread)[/url] and need some help or idea's. please read the following carefully before posting...!
to make a long story short, tuning my car didn't go as hoped...
i'll try to describe the problems the best i can, hoping you will do some serious thinking with me, seeing that myself and the guys who were tuning my car, don't have any clue on what the hell is going on!
it all starts about 1 year ago when i had some hesitation, and went to my rotary specialist to figure out the problem. it turned out to be a malfunctioning MAF. but in the process of finding the problem we had some hoses changed or unplugged to raise boost. then it hit 0,6bar with no problems or strange noises, we changed it all back to factory boost level. i can remember this: it felt a LOT quicker!
when i started to work on the car last september, the engine was still stock, i had just removed the power steering and A/C, and put on the racingbeat sparkplugs. then i took it for a spin and heard a strange noise coming from the engine and went to check it all out. it sounded like a ticking noise when i hit full boost (stock 0,5bar)
started searching, not knowing what it could be and then i found my fucked up turbo and thought that was it...
last friday i went to a company, who races FC's here in Holland, to get the car tuned.
we started out removing the factory fuel-cut and adjusting fuel @ stock boost (a lower 0,35-0,4bar due to my ported wastegate), no problems there.
all went well and we could be turning up the boost a little.
then all of a sudden, at just 0,5bar, again the same sound! they told me it was detonating like crazy... sounded like someone banging on the floor with a hammer!
we tried many things to figure out where it was coming from, but no luck.
mixture is fine, timing was at zero.
when we advanced the timing a lot, detonation no longer occurred, and we hit 0,9bar.
but then the timing was probably so advanced, that it did not really produce any more power.
they have tried building an engine with non-turbo rotors once and got about the same results.
detonating like crazy on just 0,4-0,5bar
so we compared it to a turboII engine they had, measuring the distance from the plughole to the rotors, they were pretty much the same (a bit hard to measure with the engine in the car) but not that much that it would indicate there would be the wrong rotors in my engine.
that was also almost impossible, due to the fact that i have hit 0,6bar before without any problems.
did a compression test: 6bar on both rotors and all the chambers, which is even a bit on the low side perhaps.
checked the plugs, coils, leads. they all work properly. even put on a stock pair of plugwires instead of the racing beat wires, but with those, the problem was probably even worse!
we decided to stop progress at this point and try to figure out what the problem is before we start spitting out apex seals...! at stock boost there is no problem at all, so i can run it safely for the moment.
so this strange problem was there a long time ago, and all my mods did not affect it and did not make it worse. so it would be safe to say those mods dont have anything to do with it and can be ruled out...
if anyone has any thoughts on this. dont hesitate to let me know!
to make a long story short, tuning my car didn't go as hoped...
i'll try to describe the problems the best i can, hoping you will do some serious thinking with me, seeing that myself and the guys who were tuning my car, don't have any clue on what the hell is going on!
it all starts about 1 year ago when i had some hesitation, and went to my rotary specialist to figure out the problem. it turned out to be a malfunctioning MAF. but in the process of finding the problem we had some hoses changed or unplugged to raise boost. then it hit 0,6bar with no problems or strange noises, we changed it all back to factory boost level. i can remember this: it felt a LOT quicker!
when i started to work on the car last september, the engine was still stock, i had just removed the power steering and A/C, and put on the racingbeat sparkplugs. then i took it for a spin and heard a strange noise coming from the engine and went to check it all out. it sounded like a ticking noise when i hit full boost (stock 0,5bar)
started searching, not knowing what it could be and then i found my fucked up turbo and thought that was it...
last friday i went to a company, who races FC's here in Holland, to get the car tuned.
we started out removing the factory fuel-cut and adjusting fuel @ stock boost (a lower 0,35-0,4bar due to my ported wastegate), no problems there.
all went well and we could be turning up the boost a little.
then all of a sudden, at just 0,5bar, again the same sound! they told me it was detonating like crazy... sounded like someone banging on the floor with a hammer!
we tried many things to figure out where it was coming from, but no luck.
mixture is fine, timing was at zero.
when we advanced the timing a lot, detonation no longer occurred, and we hit 0,9bar.
but then the timing was probably so advanced, that it did not really produce any more power.
they have tried building an engine with non-turbo rotors once and got about the same results.
detonating like crazy on just 0,4-0,5bar
so we compared it to a turboII engine they had, measuring the distance from the plughole to the rotors, they were pretty much the same (a bit hard to measure with the engine in the car) but not that much that it would indicate there would be the wrong rotors in my engine.
that was also almost impossible, due to the fact that i have hit 0,6bar before without any problems.
did a compression test: 6bar on both rotors and all the chambers, which is even a bit on the low side perhaps.
checked the plugs, coils, leads. they all work properly. even put on a stock pair of plugwires instead of the racing beat wires, but with those, the problem was probably even worse!
we decided to stop progress at this point and try to figure out what the problem is before we start spitting out apex seals...! at stock boost there is no problem at all, so i can run it safely for the moment.
so this strange problem was there a long time ago, and all my mods did not affect it and did not make it worse. so it would be safe to say those mods dont have anything to do with it and can be ruled out...
if anyone has any thoughts on this. dont hesitate to let me know!](Project-thread)[/url] and need some help or idea's. please read the following carefully before posting...!
to make a long story short, tuning my car didn't go as hoped...
i'll try to describe the problems the best i can, hoping you will do some serious thinking with me, seeing that myself and the guys who were tuning my car, don't have any clue on what the hell is going on!
it all starts about 1 year ago when i had some hesitation, and went to my rotary specialist to figure out the problem. it turned out to be a malfunctioning MAF. but in the process of finding the problem we had some hoses changed or unplugged to raise boost. then it hit 0,6bar with no problems or strange noises, we changed it all back to factory boost level. i can remember this: it felt a LOT quicker!
when i started to work on the car last september, the engine was still stock, i had just removed the power steering and A/C, and put on the racingbeat sparkplugs. then i took it for a spin and heard a strange noise coming from the engine and went to check it all out. it sounded like a ticking noise when i hit full boost (stock 0,5bar)
started searching, not knowing what it could be and then i found my fucked up turbo and thought that was it...
last friday i went to a company, who races FC's here in Holland, to get the car tuned.
we started out removing the factory fuel-cut and adjusting fuel @ stock boost (a lower 0,35-0,4bar due to my ported wastegate), no problems there.
all went well and we could be turning up the boost a little.
then all of a sudden, at just 0,5bar, again the same sound! they told me it was detonating like crazy... sounded like someone banging on the floor with a hammer!
we tried many things to figure out where it was coming from, but no luck.
mixture is fine, timing was at zero.
when we advanced the timing a lot, detonation no longer occurred, and we hit 0,9bar.
but then the timing was probably so advanced, that it did not really produce any more power.
they have tried building an engine with non-turbo rotors once and got about the same results.
detonating like crazy on just 0,4-0,5bar
so we compared it to a turboII engine they had, measuring the distance from the plughole to the rotors, they were pretty much the same (a bit hard to measure with the engine in the car) but not that much that it would indicate there would be the wrong rotors in my engine.
that was also almost impossible, due to the fact that i have hit 0,6bar before without any problems.
did a compression test: 6bar on both rotors and all the chambers, which is even a bit on the low side perhaps.
checked the plugs, coils, leads. they all work properly. even put on a stock pair of plugwires instead of the racing beat wires, but with those, the problem was probably even worse!
we decided to stop progress at this point and try to figure out what the problem is before we start spitting out apex seals...! at stock boost there is no problem at all, so i can run it safely for the moment.
so this strange problem was there a long time ago, and all my mods did not affect it and did not make it worse. so it would be safe to say those mods dont have anything to do with it and can be ruled out...
if anyone has any thoughts on this. dont hesitate to let me know!
03-07-2008, 05:50 PM
#3
Senior Member
Join Date: Dec 2002
Location: Wayne, NJ
Posts: 4,837
first thing I would do is pull out the CAS and re-stab it making sure the marks are lined up properly.
then like j9 said I would start going over everything, im thinking fuel problem in my own mind as it sounds like you eliminated plenty of ignition parts.
kevin.,
then like j9 said I would start going over everything, im thinking fuel problem in my own mind as it sounds like you eliminated plenty of ignition parts.
kevin.,
05-17-2008, 04:40 AM
#4
Member
Thread Starter
Join Date: Sep 2007
Location: Holland
Posts: 89
all problems are solved! turned out to be something fairly easy....
i upped the fuel pressure to 4.5bar at full throttle and replaced the plugs with NGK B9EGV. now there is no more detonation!
in a few weeks i will be updating with new pics, specs and dynosheets!
i upped the fuel pressure to 4.5bar at full throttle and replaced the plugs with NGK B9EGV. now there is no more detonation!
in a few weeks i will be updating with new pics, specs and dynosheets!
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