I'm trying to find out if my car is responding like it should. I pulled the turbo out to get checked and visual inspection the rebuild shop said turbo should be good.

Does anybody have a datalog of there boost response? Or actually can tell me how much boost they can build at 3000rpm and 4000rpm?

 

I got 12psi at about 4200 and 15psi at ~5200 rpm with this turbo. 3000rpm I could get about 5psi (I think - not sure on this)

-Manolis

 

Manolis, by "this turbo" do you mean the "T04B 60-1 .96A/R" that the thread starter asked about?

I don't have any direct experience with that turbo. But it is not very large, and I would expect that you should be able to get 10 psi by 3500 RPM with no problem. Perhaps 10 psi by 3000 RPM or lower. 12 psi at 4200 RPM seems like a slow spool for such a moderately sized turbo.

-Max

 

Note that most other turbos look "moderately sized" to maxcooper now

 

That occurred to me as I was posting. But I would still expect the T04B to spool something like the RX6, which easily made 10 psi by 3000 RPM. 12 psi by 4200 RPM is what I am hoping for with the new "gonzo" turbo setup.

-Max

 

My haltech shows only 2 to 3 psi by 3000-3500rpm.

I had it at the rebuild shop and they say visually everything is fine. The recommended put it back on the car look for something else other then the turbo but to change my configuration of the oil return line. They did not like the 90degree angle on the line.

 

Are you definite your wastegate is remaining closed until you hit your target boost? Almost definitely sounds like a wastegate problem to me.

 

Ian , How much space is there between the compressor wheel and the front cover of the turbo?I forget where you left off with this and what you have checked. So just to recap, you have checked secondary throttle plates are opening, cold start plates are gone in throttlebody, throttle is opening 100%, no exhaust leaks??
I have built boost faster on one rotor than what you describe...
I once had a HKS manifold on my work bench, I noticed it didn't line up to the exhaust ports very well at all, the port were offset quite bit, and there was 1/4 of the flange face overlaping the port itself, maybe check yours and see how bad its off...
Max

 

I took the BC out. Car boosted to 21psi by 5000-5500rpm. Still low boost from 3000 to 4500.

Went through just about everything on a previous thread. Just want to see similar cars boost response to see what I am missing.

thanks,

 

Hey max how's it going

Gap between turbine wheel and air inlet is about a mill. Turbo rebuild shop thinks there is nothing wrong with the turbo.

Secondary plates are gone. Throttle appears to have full movement. I think I had a very small exhuast leak around the exhuast. The HKS manifold had carbon on the face of it which should not be there if the gasket was facing it.

I ported the HKS manifold a few mills in the direction of overlap.

Plugs are fine. Compression showed about 80 to 90psi holding the shredder valve open around 100 to 110 with the shredder valve closed.

Thanks,


P.S what are you using for oil return lines? The shop told me to redo the lines. Mine is a straight down to a 90° bend and goes straight in the block. No real slope at all..............

 

pic

 

Hmm, the only thing left is a boost leak somewhere I guess, Lower manifold to engine block? What kind of Bov are you using? Make sure its seating fully..If its hanging up, it could be a big boost leak..
I am using a mix of stock lines and other parts I tig'd together to make the lines, basically it an L shape with a radius'd bend...It doesn't slope toward the motor at all, the bottom part of the "l" is level and its worked fine..
Got some pics of that engine bay so we can see what you have and how its setup?.max

 

Nice touch on the swaglok fittings, I though I was the only guy that used those...

That should work ok, its hard to judge what size it is, mine is about 3/4" ID.... I worked on some detroit diesel gensets with t04b's on them last week , that had the oil drain sloped upward toward the block by quite abit, the oil inlet was vertically below the drain, course diesels don't have throttle plates, but they're running 90 psi oil pressure and there was no oil in the turbo ducting on those things...
On your intercooler is there any open mounting bolt holes? Chris ng had some major *** boost leak, one of the mounting bolts went right through into the end tank, so without a bolt it there it was a dime sized hole open that he found on the bottom..Max

 

Thanks, They will outlast the car

I figured it should drain no matter what since its draining out. Pouring anything in it it just drains out!

Not much has changed on the intercooler since its the same one I was using on the stock turbo setup. O well. Maybe I will find out eventually what it is. I'm going to put everything back in the car again this weekend so maybe I can drive it for a few weeks Just so much lag makes me feel like I'm driving an NA Still boost nice though in the top rpm range. Trouble with controlling the boost thought. I pulled the WG out and it appears to be perfectly fine. I doubt it would open by itself since I hit 21psi or something with it shut at 5K.

 

Test Fitting.
Picture of dyno day minus a bunch of other cars.

 

hmm i hope you get it fixed man..which shop did you take it ian? steve's? anyways you sure that bov is workin well..one thing my friend and i noticed durring hard pulls is that your bov sound like it was leeking while on boost? maybe check that out?

 

Don't know who steve is?

The bov should have no effect on the lower boost unless it was stuck totally open no?

Iwill check it out. How bad would it be to totally remove the BOV for a test?