Hi guys,bit of a strange request im not after answers but a few pointers as to what the problem can be.I have an MY98 Sti Type R mods include Hybrid fmic,full 3" decat,K&N induction kit,Apexi power FC mapped by Andy F and since yesterday a walbro 255 fuel pump,the car is progressivly losing power on Dyno runs ranging from 309/270 to 285/260 then today 276/241.Now the latter figure is factory standard so id have thought that with all those mods it should be well into the 300s.The diagnosis today was that it was misfiring and badly needed tuning my only thoughts are that yesterday i fitted a walbro 255 fuel pump and i was thinking that maybe it was pushing more fuel that it was mapped for thus flooding the engine on WOT is this possible? its running the OE FPR
It is being remapped on 1st July

 

did they not record the AFR on the RR?

Could be rich and flooding it but wouldn't expect it to be THAT much richer.

Simon

 

No Simon,PS dont record the AFR on theyre printouts nor boost whatever it is its not running anywhere near its potential.You will have your work cut out in July

 

I am sure it won't be a problem to sort.. sounds like it is running to rich.. soon see on the wideband.

has there been any other mods since remap other than the Walbro?

Thanks
Simon

 

No Simon,no further mods just the fuel pump.It need the ignition advanced and the boost cranked up

 

naturally

 

I seem to remember a thread a while back about Walboro's overpowering the standard FPR, but I'm pretty sure it was only on 01's and newer.