I'd say that's where the difference is then.

By the way, I replaced my 3.5" Aerochamber with a new 3.5" Magnaflow and now it makes the same boost as an open pipe, but very, very quiet. Thumb's up, Magnaflow.

Mike

 

Mike,

Here's the next piece to the puzzel. I dropped the cat back and I took the car for a spin. It seems that I'm getting 3.8 psi in first and 5.5 psi in second according to my datalog. Where I was getting right around 4 psi before. So it did go up, but not anywhere near what I was hoping for.

Its kind of weird that I get two different psi levels depending on which gear I'm in. It seems that if the boost comes up slowly it stays lower.

Any other suggestions as to where my extra boost may be going? I'm using that 9-13 psi spring from turbonetics, I know that's not an exact science to the stuff, but it should be close, not half of that.

 

You have the boost reference setup correctly on the wastegate (i.e. correct port)?

 

I've seen anywhere from 11 to 20 psi with my 10 psi spring.

 

I'm pretty sure I've got the wastegate hooked up properly. There's a boost port and a vacuume port. And I only have the boost port hooked up and it goes right to the intake pipe just before the TB.

Well, I guess I'll chalk up the differences in the psi from my current engine to my origional engine to just the cam change then. I guess the extra 18* of exhaust duration doesn't give it enough umph to really spin up that turbo.

 

I see you have a racegate, if you dont have a boost controler, than the line to the intake should go to the port on the side:

http://www.turboneticsinc.com/downlo..._Wastegate.pdf

 

Right, that's what I said I did in my last post. I appreciate the link though. I was wondering where i could find something like that.

 

I wasnt sure if you you had the vacuum port and the boost port correct since you didnt menion side or top in the post Glad to hear you do.

 

Exhaust duration has nothing to do with exhaust quantity or velocity in the turbine.

Mike

 

I guess I'm out of thoughts, could I have an intake leak somewhere? But even then I would think the turbo would spool up even more to compensate for a small leak.

The only other thing I can think of is that I'm dropping a few psi across my TB. I guess I can hook the boost port up to my intake manifold and see if that helps at all. Probably not a good thing to do for an extended period, but should be ok for one or two runs.

 

just something to check Brian.. maybe tap the intake side pre intercooler and check what your boost level is there or even at the compressor scroll outlet. perhaps there is something blocking airflow in the intercooler? stranger things have happened especially while it been sitting for a while not on the car. this will also give you an idea of efficient your intercooler and intake plumbing is...

Chris

 

That is the correct way to run the boost gauge. Where is it hooked now?

 

Check out the pics on the first page. It is hooked to the intake piping jsut before the IAT sensor which is just before the TB. If you hook it up to the manifold itself don't you have problems with the turbo spinning up when you let off the throttle, vacuume closing the wastegate to spin the turbo.

 

I have never heard of that and most guys run it off the inake... interesting though.

 

its just like running it off the scroll on the turbo, except its after the psi drop from the intercooler.