Power loss

[JackJ1312]

Hi guys, I am having an issue since fitting my decats where in all gears it drives perfect, feels great until i get to 6th gear where its fine up until 3k rpm where it just seems to stop and not want to go any further making it hard to gain any sort of speed, if i drop it back to 5th it just screams all the way to the red line but back into 6th its just holds back?

 

i have also got a Takeda intake fitted which was fine its only since the decats that the issue has been known, thanks for any help guys

 

(i originally put it down to needing a map, which i have booked in for at Abbey but am now worried that if i go along for a map with this issue present it will hinder any potential gains)

[Ekona]

Redline in 5th?

 

 

*grabs popcorn*

[JackJ1312]

On a private road of course 🏎

[JackJ1312]

Okkay maybe not redline but I have no doubt it would keep going until it got there

[Mikevv]

Red line in 3rd is license losing/prison time so god knows what 5th gets you, or how long it would take

Sorry, obvious troll is obvious

[davey_83]

The issue doesn't seem mechanical in nature despite the outcome, id try an ecu reset - worth a shot.

[GMballistic]

Is it an import?

I did hear they were limited to 112mph (indicated 120mph) so just wondering if that's what was happening.

 

Link: http://www.350z-uk.com/topic/67478-limited-top-speed/

[davey_83]

Hi guys, I am having an issue since fitting my decats

[JackJ1312]

I will give the ecu reset a go, is this the pedal dance I hear about? Also no it's a uk model so it's not limited thanks for the suggestion though

[GMballistic]

I will give the ecu reset a go, is this the pedal dance I hear about? Also no it's a uk model so it's not limited thanks for the suggestion though

Yep, pedal dance AKA ECU reset.

Guide here: http://www.350z-uk.c...e-valve-resets/

 

Good luck.

[davey_83]

Or just disconnect the battery for 20mins and reconnect

[Tricky-Ricky]

Can i ask what sort of speed and RPM your doing when you shift to 6th and loose power? PM me if you don't want to post here,

the fact that it only occurs in 6th is very odd, and you also say its only since fitting decats?

[Tricky-Ricky]

Or just disconnect the battery for 20mins and reconnect

 

1 minuets will do just the same.

[Sam Mcgoo]

Can't see it actually being gear related. Maybe just the fact its working harder in 6th so highlights the issue more.

 

If it became apparent after the de-cats there's a good chance its related. Could be a few things.

 

Have you checked for leaks on the exhaust / decats/ manifold ? An exhaust leak that close to the engine can certainly have an effect on performnce and seeing as its been disturbed recently is a possibility.

 

As you say, it could also need a remap. Some Zeds seem more effected by decats than others. You say you already had an induction kit fitted so it could be that the increased flow of Induction + decats is now causing it to run lean/rich. You may not notice it in the lower gears but in top gear, working harder you maybe getting some DET so the ecu is pulling the timing causing the power loss.

 

Either way, I wouldn't be ragging it until you know its running right or you may cause serious issues. Mark @ abbey will see you right anyway if you haven't sussed it before the remap.

If your getting a remap anyway, probably worth sticking a plenum spacer on there while you're at it to get the most out of it.

[JackJ1312]

Thanks for the reply Sam, I'm booked in for the 8th at Abbey so I will certainly be taking it easy until then, I would put a spacer on but is a HR motor, the flow characteristics are what I first thought so hopefully it's right, I will update the post after the remap to see if I have the issue sorted!