Huge loss of power.
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Huge loss of power.
Hi Guys,
As some of you know I am running a HKS T04Z and I was pushing 430 whp.
Recently after a track day the car feels like it has lost about 150 whp.
The turbo still boosts the same (1.1 bar) and we tested for leaks and there is nothing. I did notice boost is coming in about 1000 to 1500 rpm later than it use to. We also ran a compressor up the I/C tubing at 1.5 bar and the air is reaching the motor just fine. I run an AFR of 10.2 on boost.
Could the turbo be on its way out, or do you think the plugs could be poked ??(Not sure if plugs can have such a big effect) I have never had any problems with the car so I dont know where to start.
Any suggestions would be appreciated.
Thanks,
BR
As some of you know I am running a HKS T04Z and I was pushing 430 whp.
Recently after a track day the car feels like it has lost about 150 whp.
The turbo still boosts the same (1.1 bar) and we tested for leaks and there is nothing. I did notice boost is coming in about 1000 to 1500 rpm later than it use to. We also ran a compressor up the I/C tubing at 1.5 bar and the air is reaching the motor just fine. I run an AFR of 10.2 on boost.
Could the turbo be on its way out, or do you think the plugs could be poked ??(Not sure if plugs can have such a big effect) I have never had any problems with the car so I dont know where to start.
Any suggestions would be appreciated.
Thanks,
BR
#3
Chasing numbers
iTrader: (5)
10.2 afr's is a bit rich. Is it running clean? I mean is it smooth going thru the power band? Hate to even say it but my last motor ran fine but just a loss of power and it ended up being a chip seal = low compresion!
Hi Guys,
As some of you know I am running a HKS T04Z and I was pushing 430 whp.
Recently after a track day the car feels like it has lost about 150 whp.
The turbo still boosts the same (1.1 bar) and we tested for leaks and there is nothing. I did notice boost is coming in about 1000 to 1500 rpm later than it use to. We also ran a compressor up the I/C tubing at 1.5 bar and the air is reaching the motor just fine. I run an AFR of 10.2 on boost.
Could the turbo be on its way out, or do you think the plugs could be poked ??(Not sure if plugs can have such a big effect) I have never had any problems with the car so I dont know where to start.
Any suggestions would be appreciated.
Thanks,
BR
As some of you know I am running a HKS T04Z and I was pushing 430 whp.
Recently after a track day the car feels like it has lost about 150 whp.
The turbo still boosts the same (1.1 bar) and we tested for leaks and there is nothing. I did notice boost is coming in about 1000 to 1500 rpm later than it use to. We also ran a compressor up the I/C tubing at 1.5 bar and the air is reaching the motor just fine. I run an AFR of 10.2 on boost.
Could the turbo be on its way out, or do you think the plugs could be poked ??(Not sure if plugs can have such a big effect) I have never had any problems with the car so I dont know where to start.
Any suggestions would be appreciated.
Thanks,
BR
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I think the compression test is the way to go then by the sound of things.
Sk8World, tell me more about the chip seal that went. Also what an easy way to test the compression without special mazda compression tester and what are the correct readings?
Thanks guys
Sk8World, tell me more about the chip seal that went. Also what an easy way to test the compression without special mazda compression tester and what are the correct readings?
Thanks guys
#5
does it sound like a tractor on idle eg is it idling fine?
Do you have a boost gauge ? if you do then check on idle if the needle "ticking" in the vacuum area, if it is then it sounds like you have chipped a seal
Do you have a boost gauge ? if you do then check on idle if the needle "ticking" in the vacuum area, if it is then it sounds like you have chipped a seal
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#10
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I use only race gas and I run HKS 10.5 PLugs all round.
Could very well be the bolts, I noticed a loose bolt on the motor right next to the turbo.
Thanks for the feedback guys
Could very well be the bolts, I noticed a loose bolt on the motor right next to the turbo.
Thanks for the feedback guys
#13
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Huge loss of power.
hey before you go racing again lean that thing out to 11-11.5 air to fuel ratio you cant keep the engine cool by running it rich that job is for the oil,coolant and spark plugs. cheers
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SA = South Africa.
#18
Rotary Motoring
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Problems I have had causing a big loss in power before without affecting normal idle or driving power, vacuum, etc.
Boost leak (sounds like you checked)
Excessive gap on spark plugs (center electrode worn or ground strap if that type)
Spark plugs loose
Warped apex seals (hot start problems on this one though)
Change in state of tune (like correction maps making you even more rich when you
are on edge of what you can ignite because weather, voltage etc changed).
Boost leak (sounds like you checked)
Excessive gap on spark plugs (center electrode worn or ground strap if that type)
Spark plugs loose
Warped apex seals (hot start problems on this one though)
Change in state of tune (like correction maps making you even more rich when you
are on edge of what you can ignite because weather, voltage etc changed).
#19
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BLUE TII ,
What you say about the mapping has always been a suspicion of mine, the battery died on the car and after that I this all started happening. I run an Apexi Power FC but I doubt the ECU would have lost or reset the mappings.
What you say about the mapping has always been a suspicion of mine, the battery died on the car and after that I this all started happening. I run an Apexi Power FC but I doubt the ECU would have lost or reset the mappings.
#20
Rotary Motoring
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If you tuned the car initially with low voltage the ecu SHOULD have been widening the injector pulse to compensate with its voltage/fuel correction map.
If you then raise the voltage back up the ecu SHOULD likewise correct and drop pulse width so you are not more rich than initial tune.
The Power fc MAY not have correctly compensated in either case though leaving you with richer than tuned A/F ratio.
??something easy to check??
If you then raise the voltage back up the ecu SHOULD likewise correct and drop pulse width so you are not more rich than initial tune.
The Power fc MAY not have correctly compensated in either case though leaving you with richer than tuned A/F ratio.
??something easy to check??
#22
Chasing numbers
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chip seal
Never did a comp test as I was ready for a ported motor and new it was coming out. I was very suprised when I saw how small the chip was in the top of the seal. it looked like something went into the motor and got caught between the seal and housing causing a pencil tip sized chip-scratch in both surfaces.
I was at the track runing high boost and my clutch let go on top of 3rd ger. Over reving -boosting. Car did run bad right away but it was because I blew off a couple of vac hoses.. So it did not just happen for no reason.. Best of luck...
#24
BDC Motorsports
I say try a compression test. Something may've happened unbeknownced to you.
B
#25
BoostedRotary check the turbo for excessive play. Make sure the compressor wheel is not making contact with the compressor housing.