i have just got done reading the compressor map for the h-3 wheel

now after ploting specific RPM points...
i found out that at 18 psi , w/ my motor (132cid) h22a4

that the compressor will be going into surge until about 5500 rpms..
now i know for a fact that the turbo will reach 18psi WAYYYY before 5500 rpms

specs on the turbo are as follows:
t3/t4B h-3 comp. trim w/ .63a/r and stage 3 exhaust..

here's is the h-3 compressor map..
if someone can give me a second opinion...maybe i did something wrong

please help before i spend $800 on a new turbo




Modified by graphic at 5:35 PM 6/23/2004

 

bump

 

I'd skip that one. It is not sized correctly for your car. Your gonna end up with a weird looking transition in your fuel curve from vacuum to boost because of the huge surge of air. (talking from experience with the h-3 )

 

besides a wierd looking fuel curve...is there anything else..
like driveability issues because of the wierd looking fuel curve?

i am particularly worried about surging...
i spoke to a turbonetics rep and he said i need MAD boost...in order for it to surge down low

doesn't 18psi qualify as MAD boost??

plot it and it surges until 5,500 rpm

 

You typically want smooth ignition and fuel curves so yes, it'll for sure effect the driveability of the car.

 

meaning like i will be sluggish down low and than a huge surge over power???