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Loss Of Power Louder Exhaust

Trex

By Trex,
in Four Door Family & Wagoneers

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Trex Grand Master

Trex

Posted
Posted (edited)

Hey guys,

i havent boosted my car hard for a few weeks, and noticed when i do boot it, the car loses power and surges a small amount, i have more power on slight throttle than 1/4 1/2 and wot. the exhaust has gotten noticeably louder from the tip, and has backfiring on de-accelerating. You can hear the differences from the turbine at different throttle positions, so i am guessing it is still boosting fine. I have an inkling it could be that the cat has let go and caused a restriction? obviously i would check it myself, but one of the bolts for the cat are tight and is almost impossible to get to without a hoist and the right tools.

edit: The exhaust sound is clean, and it doesn't want to rev quickly in neutral like it should

I've searched online and called some friends but no real answer.

Edited by Stagea97
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stock stagea Collaborator

stock stagea

Posted
Posted

I would go to an exhaust shop and get them to check it out(measure the temp in front and behind the cat), if that isn't the problem you might also find that you have lost a couple of blades on the exhaust side of the turbo, same thing happened to my skyline. Good luck and keep us posted.

Trex Grand Master

Trex

Posted
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Posted

Thanks for the help stock stag and pickles :)

Sleek came over because I was too sick to work on the car. We tested tps, checked plugs etc etc. I called Jez and another friend and dales friend...

Everyone pointed to the afm being the culprit, I've never heard of the afm doing this so I was skeptical. But sure enough dale took it for a run while it was cold and it ran fine on the cold map, then when things started to get hot it started to play up a lil. Hit it with some contact cleaner and I'll have to go for a drive this weekend.

Also with the afm problem, we had a problem with the auto not wanting to manually engage 1st or 2nd or snow mode or reverse chime etc. we freaked out until we remembered the basics 'check the f**king fuses before you do anything else' sure enough new fuze and everything is now good.

Should I buy a brand new one for $80-$120 comes with 12 months warranty. Or just another second hand for $20.

I won't worry about re soldering. Because I had an afm that f**ked out and re soldered and didn't make a difference.

Cliffs: I'm on the train killing time.

Also got some new tyres. Calling the nsw tein distributor for the rear 345mm springs

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post-108100-0-36254600-1393450626_thumb.jpg

Lakes101 Experienced

Lakes101

Posted
Posted

I seem to have the same issue with my m35 surges when in auto mode only but when I'm in sequential mode it doesn't happen at all. Also seems to stall like it loosing air have had to unplug a fpr to keep it from stalling which is making it run rich. What could the issue be here guys?

Lakes101 Experienced

Lakes101

Posted
Posted

I plan to Scott just saving for one and dyno time. But yeah fitted the stock one back into for the 3hour drive back upto Sydney. It runs perfect didn't skip a beat, idled low around 500 but no issues at all. :-/

Lakes101 Experienced

Lakes101

Posted
Posted

Neither would I mate.

After reading the nismo ecu thread started by Craig I was super pumped to get my hands on one but I'm disappointed on the outcome after installing it really. Fuel economy when through the roof was getting 12l/ 100km with standard and 32l/ 100kms with the nismo the engine was surging and kept on stalling on me. It did shift better and have better low to mid torque and spooled up earlier but at the cost of reliability. Pritty bumbed about it. Not sure why it would run lick that though. :-(

Lakes101 Experienced

Lakes101

Posted
Posted

Yeah I know:/ yep same power plant vq25det ARX nm35 stagea had a high flow if think and some other minor mods as mine so don't think that should be the issue as the nismo ecu as all set to the same spec for the vq25det. Strange hey. What do you mean by box btw? How's your car running now bud all good I hope?

Lakes101 Experienced

Lakes101

Posted
Posted

As in transmission? Yeah seems to be fine bro never had a problem with it and runs fine with the stock ecu in oh well shit happens hey! :-/

Good to here mate a quick spray is a much cheaper option to try first but they do seem to let go eventually. :-(

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