Car won't hold boost... Help!

[stokeless]

i running the 1st gen EVC and i can not get more than 12psi (holding). i'm also running the TC59 turbo. i checked for all leaks, vaccum lines and even bought a new internal WG. it'll hit 15-16 psi and drop to 12psi. what is causing the boost not to hold. i even tried switching the evc over to a manual boost controller and having the same problem.

any input would be great.

 

[Bishop92t]

If you run with the boost controller off what does the boost do?

 

[stokeless]

it will hold boost at about 7-8 psi

 

[Bishop92t]

Try using the boost controller to run say, 12psi and see what it does.

 

[stokeless]

i can run up to 12 psi no problem. it will hold boost fine. if i try to turn up the boost, it'll get pass 12 psi for a sec and drop right back to 12... i'm have all new vaccum lines and wg... i am going to loosen and re-tighten ic pipes and maybe try the manual bc again.

any other ideas???

 

[suprahero]

Garrett gt35r......................:biglaugh:

Sorry Stokeless, but I couldn't resist. I don't even know how the gt35r compares to your turbo. It's the one I"ve got and I love it though.
Good luck, Jay

 

[stokeless]

Garrett gt35r......................:biglaugh:

Sorry Stokeless, but I couldn't resist. I don't even know how the gt35r compares to your turbo. It's the one I"ve got and I love it though.
Good luck, Jay

np just help me with my boost issue:icon_bigg my turbo is pretty small. 59mm inducer with a 83mm exducer. plus it's a bolt-on. love the spool though. 10psi by 2900 rpm but i can't get anymore boost :3d_frown:

 

[suprahero]

We have turbo experts on here but I'm not one. I remember when I had my ct26 and was dynoing a long time ago. It would spool to 15psi, but it wouldn't hold it. It would always drop back to 12psi. I didn't know why then and I still dont'. Sorry that I can't help.

Send Doward a pm. He is our turbo expert.
http://www.supramania.com/forums/member.php?u=2865

 

[Supracentral]

That's an awfully small turbo. You might have maxed it out.

The sweet spot for a T04e/CT hybrid is right around 15 psi.

I'm not familiar with your particular turbo however. Doward should be able to help.

I know Turbo Concepts didn't make their own turbos. Anyone know what Garrett unit this thing is based off of?

 

[stokeless]

That's an awfully small turbo. You might have maxed it out.

The sweet spot for a T04e/CT hybrid is right around 15 psi.

I'm not familiar with your particular turbo however. Doward should be able to help.

I know Turbo Concepts didn't make their own turbos. Anyone know what Garrett unit this thing is based off of?

I went to their shop and spoke to the owner and he measured my old turbo; the hks sport bolt-on/to4e hybrid and it was a bit smaller then this turbo. 55 ind and 70 exd. so this turbo is actually larger than the hks unit. the hks unit dynoed 380wrhp at 18psi. this turbo is about par to the 60-1 upgrade ct. i was told but with better spool. sweet spot for this turbo should be 17-18 psi

 

[Supracentral]

Then it sounds like you've got a leaky wastegate or weak wastegate spring.

 

[stokeless]

also bought new wg... i'm going to try using a manual bc again and loose and retigthen all clamps

 

[suprahero]

any updates or good news?

 

[stokeless]

not yet... it started to rain yesterday. i hope to do some testing today.