i have a 98 sti, has a downpipe fitted and blitz nurspec system and a panel filter thats it as far as i no, now boost hits 1.3bar then drops to 1.1 all fine drives well. how ever sometime boosts closer to 1.5 just for a second then drops and sometime goes even further and the warning lights on my boost gauge flashes why would it do this its not all the time either every now and again makes no difference if hot or cold any help would be great thanks

 

Hi mate you are need remap(or just tweak map),because you are have fitted decated downpipe etc.,and now your new downpipe overboosting the turbo.
Drive off the boost until remap or tweak

 

the downpipe has been fitted for the past 2 years

 

i live in st helens who can map it for me? also is there anyway of telling if it has been mapped? and the issue is caused by something else?

 

standard ecu isn't mappable on a 98, so will need to replace the ecu.

problem your describing sounds like the ecu is struggling to control the boost, thats where the map comes in.

 

Boost leak possible or check all your vacum pipe as a small split will cause over boost is it ticking over a little lumpy?Check actuator/wastgate.
I ahve its same problem before with Fiat Punto GT and this cause fitting a 3'' exhaust system straight through caused a world of overboost problems.
Maybe if you have fitted a new downpipe the wategate could be catching.

 

Damn,double post

 

so what ecu am i looking at for it? is a pannel filter the best or should i replace and im in the process of getting a frontmount, do i fit them then remap to my mods

 

would fitting a boost controller help as well?

 

fit the front mount before its gets mapped, to fit you have to fit an induction kit anyway cos the pipe work interfiers with the standard airbox setup.

tbh i'd get it to a specialist and get them to have a look an advise, you want to sort the issue, or at keast get it confirmed properly, that thats the issue befor eyou caryr on modding making things worse

 

anyone in the northwest no of a good honest place to take it? thanks for your help

 

how far north west mate?

 

in st helens inbetween manchester and liverpool.

 

o r, you said above, dumbass me lol

not relay sure whos that far out and any good tbh, sure someone can advise though

 

ive had a few inprezas before all wrx tho, omg the difference between that and a sti is amazing lol, i bought this off ebay last week got it really cheap has a few minor cosmetic issues but a folder full of reciepts and the way it drove i couldnt say no, would like to meet up with ppl who no more about the sti tho have a really good check over it!

 

i personaly use scoobyclinic for my work, there oever chesterfield way, i wouldn;t go anywhere else, but its a bit of a trek fro you to get there. Wouldn;t be the furthest people travel to get there though lol

 

i have alot of recipts from graham goode? or something like that they good? previous chap seems to have spent over 3k on the car there for various bits and bobs lol

 

never used em myself so not sure

 

gramham goode is very good as what he does mate

used him a few times with the old cosworths