turbo experts 4agte

[reecegze]

That does make some sense .. but the stock t28 makes awesome response and power on stock 4agze electrics. It just runs very rich down low

[nelpd96|]

I would be trying your acctuator, that is the exact problem that I had with mine not two days ago. It looks like everything is great and good to go but the reality is that it was open just a fraction and that was all that it needed. I adjusted the actuator rod and it was good to go, back to doing what it should be. Even with a highflow you should be seeing some boost before 5500rpm. The other thing that you have to think about is the fact that because we have the ZE engine it will be slower coming on boost than the equivilent GE engine with the same turbo and boost etc. This is because the lower compression ratio means that there is less BMEP generated by the engine at a given rpm.

Cheers
Paul

[3s-86]

Hey (Hen may possibly be a nut)
What would you know about ECU's and maps mate?
I'm a mechanic and fit aftermarket computers all the time!
What I'm trying to say is that he has changed the turbo
and now everthing is way out!

Back to the subject
It sounds like you will have to change the actuator now that you
talked about disconnecting boost controller etc.
The internals on the exhaust side after hiflowing sounds a bit on the
larg side that's why you have lag up high in the revs.
What did you ask for when you went to get the hiflow done?
I would suggest get a new adjustable actuator from a turbo
outlet like GCG turbos, you may have to stuff around with making a bracket
to fit it.

[reecegze]

yer thats no probelms hes sending me a 14psi adjustable actuator turbo builder rekons new turbo is force manifold pressure to open the stock waste gate and needs to be pre tension heaps or new one... ill also finish this and run in of the turbo ..I requested faster response or same as gt28r and med/top end power.. dont get me wrong this turbo feels awesom at 5200 @10psi but its to late for my liking. Ill let you guys know how it goes anyway

cheers

[biggo]

Id have to agree with henny, on both the ecu and the turbo being built to t88 specs. I run a stock ecu and have abosutly no problems. I have a t25g on mine and see full boost by 4500rpm, starts spooling around 3200rpm. I can even drive it on the highway no worries.

I think racespec make an adjustable accurator or maybe it was just the mount? Could be worth trying tho.

[reecegze]

See biggo no offence but even 4500 is very late for a t25g.. I ran a t28 s14 "gt28r" and i saw full boost at 3800ish which was fun.. I put visegrip on the actuator to hold the wastegate closed, as the exhaust gases are to much for the 7psi spring tension.. It worked it brought my 10psi full boost done to 48000 rpm. I have to choice to keep this turbo or get the rear housing machined to suit a .49 gtr rear with smaller front comp and smaller turbine.. Which would limit this turbo from 230kw to 200kw.

[--Redwork--]

200kw is still alot....

I would be eliminating everything else befor I changed the turbo again...
Wait till you try the new gate... if that makes it better then look at other things that might be the cause..

[nelpd96|]

There are simple ways that you can assist the engine coming on boost. If you have a look at my MS paint diagram hopefully it will make sense but basically this will do the same thing as the vice grips and allow the turbo to come on boost the same without having to have the vice grip on the engine.


Basically how it works is the the turbo has the fill the container before air gets to the wastgate, if the container isn't big enough put a restrictor in the line between the turbo and the t-piece. Something like a ball valve will allow you to adjust it until you get it where you want it. Just a though because even with a high spring pressure on you wastegate you will still get creep. The best was is still electronic boost control like I have but this is a cheap option. Last point is that I would be selling the turbo and buying another rather than putting more money into the one that you have.

Cheers
Paul

[reecegze]

Its not going to cost me any money to reduce the comp wheel , rear turbine wheel and use a .49 gtr rear housing. Hes sending me the 14psi actuator next week so ill test it out if still shit house i will be getting it reduce to give more low to midrange with max 200kw

[reecegze]

My car is in perfect vaccum.. no leaks just seems a 65mm turbine wheel is lagging it up on the rear of the .64 housing