/\ great - look forward to seeing how you go

 

The greddy has a 360 degree thrust in its factory state. It is a good bearing but there isn't enough bearing-collar surface area when you put in a larger compressor wheel. You are very lucky it has lasted that long being around so much cast iron and also being so close to the engine having no additional cooling. It makes a drastic improvement in reliability.

 

I installed an additional spring to the greddy wastegate actuator on a turbocharger ordered recently.

Without the spring the rod would start to move at 7 psi. When I put the additional spring on with the rod on its factory setting, I got 12 psi out of the base setting. If you adjusted the rod length to be shorter, I got the rod to move at 16 psi! So now we have a very easy solution to turn the boost up and the rod travel is normal!

 

I've played with doing that in the past - it changes the response of the actuator in some weird ways.
Its easier to just put an appropriately-sized actuator on there.

 

I am trying a similar setup to that now - although I have the spring (much heavier than your one) going onto the WG arm .
Seems to work well . I get 10psi consistently to about 6000 after which the boost drops away to 7.5 by 7500 .
Have not tried playing with arm adjustment with it like this .

 

looks like a nice and easy solution. stinks i recently replaced my wastegate with a hks unit which seems to be doing great

 

Easier said then done. The aftermarket garrett actuators are physically larger and clearance issues will arise. More spring tension is more spring tension. It is going to open later b/c of the more tension. Better response and bottom end torque comes with more tension on the actuator.

The top end will also change because I am using a 11 blade TD06H wheel that has a casted clip. Less back pressure will make the wastegate act differently as well.

Bryan@BNR
205 640 1193

 

We just move them to a position that places them in front of the compressor housing. Fits fine.

 

any progress on this turbo or any dyno sheets? I want to see how successful people are with it before making the jump.

 

still working on getting my boost resolved..but quite a bit of room to play with...loving every minute of my upgrade..last dyno day i mananged to squeeze 290 whp 220 ft tq...def. worth the money

 

I don't think anyone has dynoed over 300 yet with this after more than a yr . There were reports of someone making 332whp after tweaking the WG shut but no dyno was ever posted .

We know it SHOULD do well over that but it has not yet been done . Gregs has been the most persistent of the users so far and has spent a lot of time on getting boost control sorted . I'm 90% sure that this can be overcome but there is still a nagging feeling that perhaps the compressor is too big for the housing/turbine combo . Possibly the 48lb 50 trim T04e (as mentioned in the 1st post)is a better upgrade to the Greddy for us to recommend to people ?

 

I've had a few of these on the dyno and none of them have produced more than 30 - 50 g/sec flow over the regular GReddy turbo.
The turbine is spinning at similar speeds, so I don't think its the compressor being too big, especially on a rotary.
I've gone up 2 wheel sizes on the GT3071 (76mm and 82mm) with no appreciable slow-down of the turbine. (Those are all 56 trim wheels, BTW.)

 

what about the possibility that the compressor housing is too small or the 90 degree bend out of the cast al. outlet pipe is too restrictive ?

 

IIRC, the outlet of the GReddy turbo is 2", which is the same as the Garrett, which easily flows well over 400 g/sec.
I make the same right-angle turn.
The inlet on the GReddy is smaller, I think, but not by much.
I'll have to look at one later.

 

Pretty sure that casting is way less than 2" at the bend but tapers out somewhat towards the exit .
Anyway : there must be a point at which the compressor wheel is too big for the overall package and i'm just raising the possibility that this upgrade may well be at that point given the difficulty people seem to be having in getting expected results ....

 

I think that the compressor wheel/housing combo simply doesn't flow all that well.
At least not at the "advertised" level.

You can go up to an 80mm wheel and it will still spin plenty fast on that turbine. The housing wont fit it, though.

 

/\ tend to agree which is why i suggested that perhaps the 48lb wheel may be a better overall fit ?

 

"48lb wheel" is not very descriptive.
The 71mm Garrett impeller will do 49 lbs - but at a Pr of 2.5 or so.
If you are looking for 50 lbs of air or so at a Pr of 2, you need at least a 76mm wheel, 56 trim.

 

This one - as mentioned in the 1st post by BNR as an alternative to the 60-1

 

That is pretty much the same sort of map the Garrett 71mm compressor makes.

 

similar - the 50 trim is making an extra 6lbs at 2pr though .

 

i came very close, the car drives awesome..feels much different from a standard greddy, very curious if i can get over 300 whp

 

How do you figure that?

They are both in the 76% - 78% range and 28 lbs at a Pr of 2.
They both run out of "puff (at 65%) at 40 pounds or so.
The small variations at the outsides of the islands are exceeded by the statistical variation.
In any event, the 71mm Garrett wheel is the small one.

The wheel you should be using for comparison is the 82mm compressor.

 

38lbs @65% and PR2 for the Garret
44lbs @65% and PR2 for the 50trim T04e

are we looking at the same charts ? LOL

 

It's not so much that 300 hasn't been broken yet - more the fact that 300 should be easy for your turbo . 350whp should be the difficult (but achievable ) target .