Question for Turbine..

[DJ-LanEvo3]

I've heard that port bit of outter part to exhaust in the turbine makes air flow smoother.. is it true? but some say
it's quite risky because it might have some chances that the shell of turbine will get cracked.

 

[dolly]

if you port your exhaust turbine, it'll definitely flow alot better... up top that is. Low end will be somewhat sacrificed. Don't forget to check/retune you afr

 

[DJ-LanEvo3]

Tq dolly.. how am I supposed to check it AFR??

Because I'm quite dull at those ECU parts..

Oh... to confirm the information.. let me repeat it again..


Just grind the whole which connects to Exhaust side

without open the whole entire turbine shell but just

grind that part bit.. it should be ok?

Will it increase the possibility of turbine get cracked?

TQ in advance..

 

[dolly]

ermm i might have misunderstood you, but you will have to remove the turbine housing and port that, dont do it with everything else attached.

as for possibility of cracking a turbine, i cannot answer that, your housing could have been fatigued previously so i dont know. but this mod is done quite extensively, even offered from tuner shops selling turbos... of course dont la enlarge until the walls are paper thin hehe. dont forget to port your o2 housing whilst ur at it!

check afr using wideband o2 sensors. best you go on a dyno which supports an afr read out.

 

[Cheong Mou Kei 4G9XT]

so after porting da exhaust housing da flow increase which mean da housing cm2 increase...so more turbo lag but better response when boost kicks in...correct o not..?

 

[xtremeleo]

I've heard that port bit of outter part to exhaust in the turbine makes air flow smoother.. is it true? but some say
it's quite risky because it might have some chances that the shell of turbine will get cracked.

yes, u can do dis for better airflow but dont grind too much. just make the surface smoother, dont thin the wall too much. there s no point increasing the capacity by sacrificing reliability. porting the wastegate channel is also a good way to prevent boost creep, better do it while the turbine is out

 

[xtremeleo]

so after porting da exhaust housing da flow increase which mean da housing cm2 increase...so more turbo lag but better response when boost kicks in...correct o not..?

dont think lagg is an issue here, reliability, yes. increasing the exhaust air flow is the cure for turbo lagg, dats y fitting in a tuned lenght banana gives out better response. less restriction in the channel causes higher air flow rate