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Boost pressures


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Anyone running fairly high boost levels on your Subaru, say above 25psi? I'm  interested see what internals youre running and at what boost levels. Just to see how well the block takes it.

 

churs

 

 

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We have done a few up to 33psi. 28psi is only one still going at the moment. Making 350wkw. Not much done to engine in the scheme of things. Forged Pistons, rods, head studs, cams and a light polish. 

The 33psi one was my old car. Snapped a forged rod. Never put on the dyno so don't know power. Was a few years ago. Would light up all 4 wheels in 4th Round ruapuna corners though, but triangle tyres prob didn't help. 

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1 hour ago, Kiwi_Fozze said:

24psi, vf30, factory longblock, bloody good tune

 

Thats impressive on standard block, glad to see it can take it. 

 

 

 

13 minutes ago, gotasuby said:

We have done a few up to 33psi. 28psi is only one still going at the moment. Making 350wkw. Not much done to engine in the scheme of things. Forged Pistons, rods, head studs, cams and a light polish. 

The 33psi one was my old car. Snapped a forged rod. Never put on the dyno so don't know power. Was a few years ago. Would light up all 4 wheels in 4th Round ruapuna corners though, but triangle tyres prob didn't help. 

Great info and good to read, head studs in that engine  is that 14 mm stud conversion or just arp 2000 factory size?  Your old car what rods were they and how long did it last at 33 psi?  just road driven or raced? Churs

 

Im looking at going to 30-32psi on my build, I imported some case halfs with cnc insert to make it a cdb block and oil gallery mods but not stud conversion,  going high tensile 625 arp instead. Going to over engineer it with 1000hp capable Carrillo rods I'm paranoid I'll stick a rod through the block and don't want to fork out for one again. 

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On 19 July 2017 at 0:35 PM, gotasuby said:

Eagle rods in both. Arp head bolts in both. Standard ones. Did 30000km in the 2.5 with 33psi road only. The 28psi one has done a season of rally and a year of drags plus daily street duty. 

30k, that's awesome, and that's encouraging. the 28psi is going strong still so I suspect it's fully forged too. Txs.

 

5 hours ago, boon said:

25psi from a Holset, unopened V7 STI longblock.

 

Shortly going to maybe give that a little nudge as the new turbo likes high pressure ratios.

 

Cool, I'm surprised a standard block can handle that boost fine.

 

I've just calculated the efficiency of my turbo and at the current setup I'm bang in the most efficient zone at 25 psi, my new set up is going to mean I have to go two sizes bigger in the garret range,  if I want to keep the efficiency where it is. I think I'm going to sell mine and contact Steve Murch to get local service and match the turbo to the engines air flow rate.  

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