Hi everyone
Need some advice I've got a 2003 bugeye wrx sti got a problem with turbo lag in 3rd and 4th between 4000rpm and 4500rpm the car just seem slow but as soon as I'm past 4500rpm it picks up again.
I've fitted a full decat exhaust system and have checked that for air leaks. Changed the cam sensor as that was the only fault the came up on the diagnostic and checked my plugs are all good.
Any suggestions would be a great help

 

Hi fella.
Has the car been mapped to suit a full decat? Perhaps this is the issue? If so the ecu will struggle to keep up.
Phil

 

No it hasn't Phil was waiting till I've done the intercooler and fuel pump.I see you thought process thanks mate

 

Sounds like plugs or coil packs to me.
Re the plugs, when you say "checked they're all good" - in what sense?
Did you check the gaps as well as condition?

 

I just checked the condition wasn't sure and got too confused with what gaps I should have!!

 

Needs mapping for exhaust asap.

 

Why ASAP can it do damage??

 

Yes. Your system is flowing more gas out than the ECU thinks it is and all the ECU measuring parameters & settings could be out as a result. Could see overboosting and all sorts in theory.

The ECU will fuel correct itself to an extent to compensate for a filter change etc, but full exhaust change is quite a big change so I would always do a remap asap after this.

It's my guess that this is why you are no longer seeing smooth power delivery.

 

I can see your thoughts thanks mate got a sti intercooler at home ready to go in so a remap at the same time I think ie next week any recommendations on who to get??

 

There are lots on here I would reccommend through very good feedback, but personally I have only used Duncan from RaceDynamix with good results. He is in the South coast very near you I believe (Also mobile & will travel to you).

Alternatively there are: Jolly Green Monster (AKA Simon) who is also mobile and can travel to you, Scoobyclinic, Zen performance, Bob Rawle, Engine Tuner, Andrew Carr, API, FB Tuning, DSA In Aylesbury.

Probably loads I've missed out!!!!

 

Did you fit a new up pipe?.

 

Thanks mate I'll give a couple a call

 

Yeah I did mate

 

That could be your biggest issue then. Will need a remap for that as turbo is breathing much better than the system thinks it is.

 

Thanks mate just calling a couple of mappers now

 

Definitely should be mapped.

 

Which up pipe did you fit?.

 

 

Hopefully that's your problem then. Get your bits on and then a map. happy days
Phil