a1320honda

I was just searching around and couldnt come up with an answer on if one gate flows more than the other. I currently have a setup that has a boost creep issue with a Tial 44mm wastegate on a topmount with a Precision 62mm turbo. So i was just curious if i went with a Precision 46mm if it would help. So far i cant find flow numbers or proof if any that one gate is better than the other in terms of flow. Im not looking for speculation on the topic. Im looking for someone to say they had creep with one or the other and changed to the opposite and it helped. Looking for real world experience. Any help would be greatly appreciated.

deuce_Fc

I'm running a top mount with a much smaller turbo @17psi no creep. U might be boosting way more than me though.

twkdCD595

Actually it is the reverse you need to worry about... running more pressure or higher boost you do not need as much wastegate size/ flow as if you wanted to run much lower pressures.

ETA: OP how much boost are you trying to run that your seeing creep? What about wastegate placement? If the wastegate placement can be improved, it might be cheaper and more effective to modify your manifold a bit than start buying new wastegates until you find one large enough.

a1320honda

I have another thread describing the setup...but basically its a top-mount with a Precision 6266. It used to have a 2 bolt 38mm flange but i reworked the setup with what i thought was a better wastegate setup. I pulled the gate off completely and by 9200 in 3rd gear it had crept to 11lbs.

Ive already ordered a precision 66mm gate.

scottdh20

if you don't mind me asking what velocity stack is that?

deuce_Fc

This shine some light for me that is, less boost more creep. I never thought that was the case. But thanks for the info, what's funny is that my old 44mm Godspeed wastegate held 14 psi all day, but as sure as I increased it, 21 psi off the whole, took that crap off. Now my MVR tial holds like a champ.

My only suggestion is a crimp in the vac hose maybe?

wantboost

iTrader: (2)

The precision wastegates are junk

I've seen the duty tests and they are always the first to fail, very early in the test

Turbosmart and TiAL never failed in the same test

Plus the precision wastegate is basically a rebranded china piece.

rich7777

Now, now, Wantboost. That's a bit unfair. You can't put them in the CX racing (your favorite) or Godspeed category.

a1320honda

As i posted in my other thread...I know several guys running PTE gates for long periods of time with not a single failure yet. I personally ran a 66mm PTE gate on my 42R down at 9lbs with 0 issues. Only reason i posted this was to see if going to a PTE 46 over a Tial 44 would help. I couldnt get any answers so i ordered another PTE 66mm to use. If it fails, ill gladly post in here so you can say "i told you so". Other than that, from personal experience on 5 or 6 cars ive tuned with PTE gates, they worked flawlessly. I just didnt know if the bigger mm on the same flange actually flowed more.

TheShodan

iTrader: (14)

No, you're right.. but close enough... I'll let a1320honda see the other thread regarding the tests that wantboost was referring to.

wantboost

iTrader: (2)

And the rule is this

High boost, smaller wastegate
Low boost, bigger wastegate

Of course this depends on other factors like engine size, rpm range, ve, manifold design, turbine side, etc

Little motor



Small turbo, low boost, huge wastegate (44-46mm+)
Small turbo, high boost, small wastegate (35-40mm)

Big turbo low boost, big wastegate (44mm min or run multiple units)
Big turbo high boost, small wastegate (single 40-46mm)

Of course this is a generalization.... real world apps vary greatly

A good tool to use is Borg Warners matchbot... allows you to see turbine flow based on engine size,rpm, boost level, housing size, wheel size, etc and gives you a rough wastegate size as well and will indicate of the wastegate size is at its choke point