68/70 HTP F3 BB Turbo

[anders]

Hi
I am about to swap out my 64/66 for a HPT 68/70 for my 4.1 stroker, looking for atleast 700rwhp, is it a goog shoice?
Making 590 rwhp today.

 

[Mr.Spool]

Hi
I am about to swap out my 64/66 for a HPT 68/70 for my 4.1 stroker, looking for atleast 700rwhp, is it a goog shoice?
Making 590 rwhp today.

Ok ill ask why cant you do 700whp on a 64?

 

[Mr.Spool]

Where is your backpressure now?

 

[anders]

är på

Ok ill ask why cant you do 700whp on a 64?

Dont now it will only spool to 25 psi.

 

[anders]

Where is your backpressure now?

Havent check the backpressure no sensor

 

[dynoman]

What are you using for a wastegate ...internal or external ?

 

[turbocamino1]

är på

Dont now it will only spool to 25 psi.

Exhaust leaks can spring up at any time..ask me how i know : / 26 is about where mine stopped with a JB6766

 

[anders]

What are you using for a wastegate ...internal or external ?

External

 

[Mr.Spool]

Havent check the backpressure no sensor

Need to look at it to see where the system is at.
If backpressure is low
Then your not driving the turbo hard enough.
We use co2 on the external gates to achieve this not manifold pressure.

 

[GNVYUS 1]

590whp on a dynojet could be
590/.85 = 694hp crank
(11% dynojet and 4% converter)

You got the dyno graph, what was timing and total boost, 25psi and maybe 18 degrees?

Only 25psi seems off, can you post a picture of your wastegate setup?

Like Spool stated you might need to bail on the 64mm.

 

[Peacock]

My old car made 682whp with the HPT 6466 at 29psi. Ran out of wastegate spring. Turbo showed no sign of slowing down

 

[Ttype6]

är på

Dont now it will only spool to 25 psi.

The first thing that comes to mind is that exhaust pressure is forcing the wastegate puck open. You should be able to find a spring at the local hardware store to increase the pressure forcing your puck closed. Drill a hole in your actuator bracket to attach one end of the spring to then remove the clip on the swing arm and install the other end of the spring in its place.

 

[dynoman]

The first thing that comes to mind is that exhaust pressure is forcing the wastegate puck open.

He's on an external gate , but we don't know if he's using manifold pressure ( I think he is ) or CO2 .

 

[GNVYUS 1]

Also OP, what springs are in the WG?

That's because they are only good for about 20psi over base on manifold and some gates come really low like 7psi.

 

[Mr.Spool]

Im going to do an internet guess and say get need needs some co2 and dome pressure

 

[Ttype6]

He's on an external gate , but we don't know if he's using manifold pressure ( I think he is ) or CO2 .

I read external, but my brain turned it into internal.

 

[TType85]

Im going to do an internet guess and say get need needs some co2 and dome pressure

100% Running co2 has been much more consistent than boost to hold the gate shut.

 

[Mr.Spool]

100% Running co2 has been much more consistent than boost to hold the gate shut.

Ya know what would happen if all these guys went external and co2?
We would never be a wastegate thread like the thousands upon thousands we have seen over the years