TOMSUN'S JB STARION - Updated 25.5.2014

[TOMSUN]

^^ I'll some pics shortly.

And thanks for convincing me to upgrade to an LS1 ignition set up. :D

[TOMSUN]

Ceramic coating from High Octane. Exhaust manifold, turbo rear housing, heat shields and dump pipe.

[TOMSUN]

Have been playing around with Garrett's "BoostAdviser" app.

Target power (crank) 380hp. Approx 300rwhp?
Capacity 2L
Pump fuel
12.5:1 AFR
BSFC 0.46
2 valves
VE 0.85
Mid power 4500
Max power 6500
Intercooler Air/air
Pressure drop 1 psi
0.7 eff.
Zip code 90120

Spits out
Required boost 27.75 psi
Recommend turbos
GTX2860R, GTX2863R (mine), GTX2867R

Should be interesting theory vs reality.

[fugazi]

If you lose about 59kW from crank too wheels the gerbox and diff will probabley melt in a minute or 2 ...

But... with the stated pressure on a standard motor making 125 N/A hp you will end up in the 350-360hp region...
(With a twincam 150hp N/A and that pressure it would give some 430...)
But 8 valve is cooler!!! :D

Any "better cam" inside that one?
EDIT:
Found the cam is a Camtec Stage 2.
Is that the 278° cam?

[TOMSUN]

The old cam was a camtech stage 2. New cam (installed but not run yet) is a camtech stage 4, duration 292. See page 7 for full cam specs.

As for drive train losses, people say you can lose quite a bit 10 or 20%.
Nothing is going to melt but heat is generated through the losses. Hence diff oil coolers for high hp cars and finned transmission cases etc.

[thrash]

did you mean 90210 for the zip code? ;)

the barometric pressure in and around sydney is between about 14.7 to 14.8, so you could use that for an ever-so-slightly better accuracy.

[fugazi]

With a 292° cam you won't need as much pressure for that hp... :beer
23-24psi will probabley make 350...

[popup]

And what was the result of the Stage 4 cam, I'm looking to get a new camshaft so trying to decide which one!

[TOMSUN]

Dyno update (from 2017)...

[popup]

Very nice, just had to re-read your list of modifications to see how you got there!

[TOMSUN]

Actually this is a better dyno that was done back in 2014 with the same set up just with more timing. Note it only travelled 1,065km in 3 years. Most of which would have been driven to the drag strip and back.

[quest]

This car is a fine template for what 'could' be done to a 2.0 sohc flatty staz. Heck of a job, Sir!

Camshaft swap wasn't single item back-to-back, but any thoughts on characteristics vs ?
Does the motor rev out & pull to 7000 rpm ?

[TOMSUN]

Yeah, the stage 4 (billet) did help it to rev over the stage 2 (regrind). Others recommend a Ralliart? copy as a better grind for revs… I don’t know really.