Rb25/30 Build

[tazzy]

Hey guys,

Ready to order pistons for an rb25/30 build i'm doing. Purchasing JE customs for the combo. Question is what compression do we want.... Want to run a gt35/40 sized turbo at around 18 - 20 psi to make around the 450hp mark at the wheels. Any one with a similar combo making similar power thats been running good for a period of time?

Looking to upgrade the camshafts also. What make of cam are you guys running in your cars?

Planning to use acl race series main and big end bearings, anyone heard anything bad about them or have a make that you would recommend?

Kind regards,

Tas

[JonnoHR31]

depends, mainly on fuel used. for 98 or mixxed use go for something around 9:1. for e85 only 10:1+

standard cams are fine and arguably the best for your power goals

[tazzy]

Anyone else?

[PSI Parts]

I decided to go 9.5:1 (Custom CP's) instead of the standard 8.5:1 as I plan on using high octane fuel at all times and possibly E85 down the road. Even if I have to back off the timing a little it will still help having a little extra compression.

As far as the cams go, I have gone with Tomei Poncams and matched them with Tomei Valve Springs. Depends how much the car is used for everyday stuff where you want to eliminate noise and smooth drivability to some point.

I used ACL bearings all round and wouldn't even look at anything else.

[tazzy]

I decided to go 9.5:1 (Custom CP's) instead of the standard 8.5:1 as I plan on using high octane fuel at all times and possibly E85 down the road. Even if I have to back off the timing a little it will still help having a little extra compression.

As far as the cams go, I have gone with Tomei Poncams and matched them with Tomei Valve Springs. Depends how much the car is used for everyday stuff where you want to eliminate noise and smooth drivability to some point.

I used ACL bearings all round and wouldn't even look at anything else.

i see, we are thinking on using the 8.5:1 and the car will probably only ever run on 98.... i have performance springs (brand name) and am yet to decide on cams the car will be driven almost daily.. and i am gonna go with the ACL bearings also which tomei pon cams do you have ?

[PSI Parts]

We went with the 256 Duration and 8.5mm lift