Jump to content
SAU Community

Recommended Posts

More boost will make a restricted system worse, if the rear housing or manifold is restricting the system more boost will dramatically increase manifold/back pressure coursing detonation

Get an EBC, they are better all round and will hold the wastegate shut longer by not allowing it to creep open which will make it ramp onto boost quicker and you can try different boost levels to better see what's going on

My thoughts too. If nothing else the tuner can TRY and hold a steady boost level to redline - if they try and hold 20psi and they run into flow issues or holding boost issues they SHOULD be able to build a bit of a picture of which area of the setup is starting to hold things back.

My feeling at this stage that you may be getting near the limit of this kind of combo and are probably already making decent power - though the bleed valve could be exasperating this. As I asked in PM, what discussions have you had with your tuner about it? They will have more of a perspective than any of us on how the setup is behaving... we're just taking pot shots from what you have shared.

My tuner said that at 23psi it wasn't making any more power so they backed it off to 22psi on a safe but still optimal tune, recommended Type A Poncams for more power and an EBC to hold boost steady up top. EBC I will get, cams not, they didn't mention anything about exhaust manifold being restrictive or housing. Yavuz did say that with a bigger housing I could get more power but that's only after I asked, so not really recommended me one unless I really wanted to go that way. He said these Precisions will easily boost to 30psi with e85 and the right setup.

Edited by rondofj

OK - the fact he recommended an EBC is a huge hint, if it's not holding the boost he wants and it's making respectable power for the boost it is running at peak power then that is a pretty big indicator I reckon. Holding more boost at higher rpm = holding more torque at higher rpm = more power :)

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Similar Content

  • Latest Posts

    • Not sure the US can import anything other than the C34 Stagea's, but if you can and you need to to tow, DO NOT under any circumstances get an M35 Stagea. If it is just as a family car and your country/state allows it, absolutely and definitely get an M35 (3.5L if possible as it is effectively a 350Z) over a C34.
    • Punch your VIN (nm35-xxxxxx) into Amayama.com You can see everything there quite easily.
    • Thanks for that, I'll check it all out. I can always do the brakes last anyway if its a problem.  The 16's are super cool, if they do fit I'll cruise around with them for a bit.  
    • Well, that's kinda the point. The calipers might interfere with the inside of the barrels 16" rims are only about 14" inside the barrels, which is ~350mm, and 334mm rotors only leave about 8mm outboard for the caliper before you get to 350, And.... that;s not gunna be enough. If the rims have a larger ID than that, you might sneak it in. I'd be putting a measuring stick inside the wheel and eyeballing the extra required for the caliper outboard of the rotor before committing to bolting it all on.
    • OK, so again it has been a bit of a break but it was around researching what had been done since I didn't have access to Neil's records and not everything is obvious without pulling stuff apart. Happily the guy who assembled the engine had kept reasonable records, so we now know the final spec is: Bottom end: Standard block and crank Ross 86.5mm forgies, 9:1 compression Spool forged rods Standard main bolts Oil pump Spool billet gears in standard housing Aeroflow extended and baffled sump Head Freshly rebuilt standard head with new 80lb valve springs Mild porting/port match Head oil feed restrictor VCT disabled Tighe 805C reground cams (255 duration, 8.93 lift)  Adjustable cam gears on inlet/exhaust Standard head bolts, gasket not confirmed but assumed MLS External 555cc Nismo injectors Z32 AFM Bosch 023 Intank fuel pump Garret 2871 (factory housings and manifold) Hypertune FFP plenum with standard throttle   Time to book in a trip to Unigroup
×
×
  • Create New...