Engine/Transmission (1998.5 - 2002) Stock turbo vs. boost

[sparks57]

I read in the magazine that the HY-35/9 is not good past 22psi because the boost becomes too hot... is that true?



I plan on purchasing Marco's ecm VERY soon, and I know that the boost limit is raised... should I keep the HY-9 down to 22psi?



Or will the wastegate blow and keep it there anyways?



Please tell me a little more! I've never owned an electronic truck or a turbo with a wastegate before... so please give me the basics on how it all works together!



EDIT: One more question: what is the max CFM of a ported HY-35/9? I currently have the stock airbox with a drop in K&N... will I gain anything by going to a mega cannon or would it be waisted money?

 

[lmills]

The wastegate is regulated by boost pressure pushing against a diaphram. The only thing the MAD ECM will do is not defuel if it sinces an overboost, which will most likely happen with upgrades. The key to getting more boost is to install a boost elbow on most manual transmission trucks. Your auto will need a turnbuckle to achieve the higher levels. Also the HY can easily push more than the 22 psi. The probelm is the turbo is no longer very effiient after that. That is why the air starts to get hotter. Mine has seen many trips to 38-40 psi, is that advisable, probably not.

 

[boydo]

Maybe consider a HX35 will make realiable boost to 35 PSI, Any higher will over speed turbo shortening it's life.

 

[sparks57]

Yes, I plan on going with the PDR35/14 soon... thanks for the advice!

 

[sparks57]

Haven't gotten an answer to my last question yet...



Does anyone know the max CFM of an hy-35? How much after it's been ported?