Hehe, yeah they go bang, crash...grind!

oh and I heard the ceramic wheels don't like much more than 12psi.. reliably..

T25's from Z32's have steel wheels, the manual is slightly larger wheel than the auto... just a thought..

Do you realy think an inlet manifold would have an overriding impact on Hp production???

The manifold would have little effect on where this engine makes power.
The torque line on any dyno graph is a representation of engine volumetric efficiency(VE). On a turbo engine, boost is usually the thing that has the biggest impact on the torque curve.

Hp is a function of torque and rpm.

The first rapid climb in the curve is where the boost is rising to 160kpa(already said this on an earlier post). once the wastegate is open the curve more closely follows the cam, headwork and manifold choices. The rise right at the top end is because of a little boost creep.
I built this inlet manifold for a road car with a mild cam. The length was to help a little either side of where the mild cam worked best, just to help flatten the curve. I just used it on this engine so i didnt have to make another one.
It would be different to what it is, if it was built for this engine.

Sorry bit tired writing last comment.

Just wondering if the long inlet runners has some
influence on the torque curve almost mimicking the
power curve on the graph?

Inconel is perfect.

Hi Joey, Yes, standard comp with only a light skim of the H89 head. I didnt measure anything related to comp but id guess just a touch higher than standard because of the head skim.

Engine life, is an interesting question.
With moderate boost, the peak cylinder presure isnt much higher than a non boosted engine. But the pressure is maintained for more of the power stroke. Because of this, loads on rods and bearings dont go up much. Its more a matter of thermal management, things like pistons and cooling systems can be quickly overcome because the extra time the force/heat is applied per power stroke.

Ring wear would go up a bit because its forced againsed the bore longer on each power stroke. compared to NA.


Keeping the standard pistons from overheating is probably the biggest concern.
Thats where E85 is is a huge help. Good intercooling plays a big part too.


The engine managagment system can also play a big part in saving an engine. Things like Compensation tables set up to retard ignition as intake temps rise or Electonic boost control backing off boost if EGT`s get a bit high.

Where mine is at now i`d expect 100,000 Kms on a road car with sensible rev limits and general good treatment. Or a season of racing.

But get something wrong with the tune and it might last 5 minutes if its allowed to detonate.

G`day Leigh!! Heading out for a practice and sprint at Winton this weekend. IPRA round is looking good at the start of Oct, also at Winton.
No Star Sharks yet but V soon.

What kind of compression ratio do u run, low comp?
You said you were using standard pistons with the dish, just interested.
Do you think the pressure the turbo may be putting on the stock pistons/rods etc will decrease the engines life?
Very good work hope you increase the HP, cant kill these dattos.

nice work simo, are you planning on hitting any ipra rounds with it? is it wearing the starsharks yet?

D, Im not sure what you are asking, maybe try to re-word the question.

Ti turbine wheels, if available, would be way over the top for such a project.
Im trying to maximise my Hp/$. So at the moment i think i can get another 50 or 60 Hp by spending only another $300 on the steel(inconel) wheel.

Simon, would the very long runners reflect on the
torque curve almost mimicking the power regardless
of the camshaft used?

Also you know how much more Ti wheels would be
if available from Japan?