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Where's The Power Gone?

Country Cruzin

By Country Cruzin,
in Engines & Forced Induction

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Country Cruzin Collaborator

Country Cruzin

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My car has lost about 85hp at the wheels, thought the motor was getting sad, but got the leak down test an compression test done both came back fine. tune still seemed good just missing power (from 385 back to bout 300)

wondering if anyone had any ideas wot it could be? thank in advance :thanks:

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Country Cruzin Collaborator

Country Cruzin

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Might get them to pull the exhaust off an see if it makes any difference, could be possible.. tho is there much to collapse in a 3inch metal cat..they are nearly straight thru. Wot could get stuck in the intake? hopefully the air filters get rid of anything big enough to clog an intake pipe. Dont think it would be fuel cos its a noticable difference on the road an it just dont go as good as it used to, an was the same dyno. but will get them get them to check out the exhaust. the turbo's are bout 2-3 years old garret think they're -5's running 20 psi is it very common for turbos to shit emselves or something cause them to run inefficiently?? Havent eva noticed any wierd noises when boosting. just dont seem to get the effect they used to give. something seems to be choking the engine somewhere.

XKLABA Grand Master

XKLABA

Posted
Posted

Might get them to pull the exhaust off an see if it makes any difference, could be possible.. tho is there much to collapse in a 3inch metal cat..they are nearly straight thru. Wot could get stuck in the intake? hopefully the air filters get rid of anything big enough to clog an intake pipe. Dont think it would be fuel cos its a noticable difference on the road an it just dont go as good as it used to, an was the same dyno. but will get them get them to check out the exhaust. the turbo's are bout 2-3 years old garret think they're -5's running 20 psi is it very common for turbos to shit emselves or something cause them to run inefficiently?? Havent eva noticed any wierd noises when boosting. just dont seem to get the effect they used to give. something seems to be choking the engine somewhere.

lol I pulled my intake apart on my 32 for shits and giggles and found my missing 13mm spanner in the BOV return pipe??? !!!!

85kws is a big lose, maybe a hole in the intake pipeing or small hose come off, any black smoke under full boost?

djr81 Grand Master

djr81

Posted
Posted

Depending on your set up - oiled up AFM's will have that effect. If you are running a recirculation system for blow by gases and it is leaking oil out the bovs (common on GTR's) or you have re-oiled a foam air filter there is a fair chance the AFM's are messed up.

This causes them to read high - the consequence being single digit AFR's, less ignition advance and no horsepowers.

If you had it on the dyno what are the AFR's?

Country Cruzin Collaborator

Country Cruzin

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have got a vipec ecu so no longer use the z32 afm's (i should pull them off an sell them..if they're worth anything 2nd hand.)

Car was dyno'd this afternoon, an mechanic thinks its a clogged exhaust. so they gunna take the cat out in the morning an re dyno it to see if thats the prob

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