I am not hitting full boost until about 4800-5000 rpm with my Greddy kit. I have been reading on other posts that guys are getting this by 3500 - 3800 rpm...

Here is what I have on the car:
-----------------------------------
-Greddt TT kit (all stock, running 5.6 psi on boost controller, no tuning)
-fuel pump
-emanage ignition harness (not doing anything with this yet)
-Nismo cat back
-Stock Cats still installed
-Greddy e-01 boost controller running the following settings
-Low Auto
-Target Boost 5.6psi
-Gain set to 80
-Start boost set to 3psi
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What would be causing this? I would assume it is either the stock Greddy tune in the emanage is really rich and boging the car down, or I have the settings on the boost controler setup wrong...

The car feels like it takes to long to build boost, but once it hits the car really takes off. Seems like something is restricting it from getting spooled up. I start to build boost at about 2700 rpm then it takes until 5000 rpm to build 5psi. Something does not seem right.

Any thoughts? I plan on retuning the car for about 7psi with the help of Sharif @ Forged Internals in a few days, but I want to make sure I don't have a issue other than a poor tune.

Thanks!!!

 

WOW! with the Gain set at 80 you should be over boosting to close to 20psi. There is a problem with your system. The stock cats are slowing your spool but not anywhere close to your problem.

My best guess off the cuff without more info is that the wastegate valve seats did not get installed and are allowing alot of exhaust energy to escape that way and not spool the turbo. Who did the install? Do you know if they were installed?

Second guess is the good old boost leak. You should go through and check you hose clamps/connections.With that large of a leak you would probably hear the air escaping. You should test it afterward with the boost controler off. Because if you do fix it, it should make 5 - 5.6psi on it's own without the controller on.

Gary

 

That gain is a little too much. Try manual settings I never had luck with auto settings.

Use the following for the stock boost you are looking for:
set=0
gain=10
start=3

Then you can see what your base boost is exactly and then adjust the 'set' accordingly, that number is a percentage increase over base boost, so if your base boost is 5 then a set=10 should yield around 5.5 psi.

 

I did the install myself...

I did not install the wastegate seats on the manifolds, because the ports on the manifolds were not large enough to accept them. They clearly were not going to fit inside of the greddy manifold. The only thing that is installed is the gaskets with the metal fire ring. I have done other installs that used a Tial wastegate and did not require the seats either.... I still have them, I just figured that Tial included them as a standard offering, but were not intended to be used in this particular kit. In order to get them to seat in the manifolds I would have to port the heck out of them to make the port large enough to allow it to seat properly...

Now I was testing this in 1st, 2nd, and 3rd gear... I was told that I should be doing this in 5th gear...

 

Well 5th gear is the 1:1 gear for exact dyno results but 4th is usually good enough, when I check my af and tuning I do it on the street and do some runs from 1st to 3rd gear and log the data with e01 and then tune the emanage with that info.

 

So if you kick it in 3nd gear around 2000 rpm when do you see full boost by?

Kind of wondering if I should have used those damn seats on the wastegates... Although it appeared to me that the gate had a pretty good seal without it...

The other thing that I forgot to mension was that I am only using the bottom port on the gate for the boost controller... I hooked it up that way without thinking about it, then it was too late (not enough vaccum line left ). I would not think the opperation of the wastegates would be effected that much by working of the bottom ports (like an internaly gated turbo) and the top ones. I know I need to change this, just have not had the time yet. Could this be a larger part of the problem that I did not take into consideration? Right now the signal is coming from the intake manifold to the boost soliniod and then y's off to each wastegate...

 

The car will never boost right without those seats. The wastegate valve seals against the seat insert. With them out there is a small gap for the exhaust to go around. They are a very tight fit. But they may have sent you the seats for a larger wastegate by mistake.

I knew what it was when you discribed it because numerous guy have done the same thing on here before.

It's no big deal to just use the bottom ports for a low boost setup like yours.
Gary

 

If that is the case, that SUCKS!!!! That was the biggest PITA of the whole install, getting the damn wastegate, turbo, downpipe to line up and all bolt on. Dangit!

 

I was also thinking that maybe this could be a result of having the stock cats still installed... That is quite a restriction on the turbo especialy since it is less than 8 in from the turbo itself. I would think test pipes would impact spool time significantly...

Any thoughts on that?

 

They will impact the spool, but not that signifigantly. Maybe another 300 to 500 rpm's.

 

Well looks like I am going to be pulling the gates off and trying to get the seats installed... I will let everyone know the outcome. I guess I was just trying to talk myself out of having to pull apart that part of the kit. Of all the things to have to take apart!!! DANGIT!!

Guess it is a god reason to do the test pipes also...

 

i had stock cats on my car while running 8.5lbs on a stock motor..did not affect spool in any way that i could notice

 

Gary, good ****ing call. I have seen this so many times from guys with Tial gates. Having a dyno for a few years you start to see people have a lot of the same problems with certain parts. Tial should make it more clear for the n00bs that the valve seat is an important part to have in there.

Imagine how many emails and calls they probably get every week that say "my wastegate is leaking at cruise and idle".

 

Well it also helps if you are not trying to install the seat backwards!!!

"Goaud! Neopleon your such an idiot!"

I did not look close enough at the seat and the gate to see the the raised edge with the bevel for the valve installs against the valve. I was trying to put it in the other way and make that part go in to the manifold...

I hate to admit this, put I used to own my own tuner shop, featured in both Sport Compact Car and Super Street. This is really pretty embarasing!

But, hey without these boards it would have taken me a lot longer to figure it out.... Thanks guys!

 

your humility earns you much respect! glad your problem is resolved