Jump to content
SAU Community

Recommended Posts

i had more of a look at the manifold and noticed it has some extra welding in some places so not sure if it has been modified in any way.

looking at the graph the boost drop is around 1.2psi or so.. i mean is that a bad drop in boost compared to what others have seen out there?

and when you say it could be a badly setup boost controller is this caused by long vacuum lines?

  • Replies 52
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

Posted Images

1psi isnt bad at all.

Our race car engine drops about 4psi after 4800.

Its all easily fixed by having a good electronic boost controller that is configured to help maintain the desired boost pressure which can be a little fiddly to setup properly at times. So long as the mechanical side is spec'd and operating correctly then there is no reason it shouldnt be maintaining target pressure.

  • 1 month later...

hey guys,

i got the motor back together and the car is now at JEM getting a E85 tune.

what ive done is;

replaced crank and bearings (ACL's)

balanced balancer, crank, flywheel, pressure plate

Ross harmonic balancer

checked head stud tensions

new timing pulley

new intake gasket

new turbo manifold gasket

New HKS intake camshaft

Used VCT intake cam gear

decat pipe

external to atmosphere

E boost2 controller

NPC custom single plate clutch

shortened intercooler pipes

relocated blow off valve

new tensionors timing belt

Id1000cc injectors

2x bosch 044 fuel pumps

4 litre surge tank

Dash 8 fuel supply line

let see what this little GT35R with the 0.82 hotside can pump out on E85..

It's most likely due to 250rpm increments it's looks more wavey than normal 500rpm increment

nah mine plots every 50rpm and that sine type wave is an issue with boost controller or boost control plumbing to gate. Blitz boost controolers do that if it is just clipping the overboost setting.

nah mine plots every 50rpm and that sine type wave is an issue with boost controller or boost control plumbing to gate. Blitz boost controolers do that if it is just clipping the overboost setting.

generally spikes in solenoid duty cycle cause it..

  • 2 weeks later...

after weeks sitting in there shop now they tell me the head needs to come off to be line honed..

surely they could see on the old cam shaft was damaged when they first took it out over a week ago.......

anyways im not happy at the moment

whoever built this motor has put a bearing at the front on the inlet camshaft, which the clearances where not 100% correct & the VCT gear was loose on the camshaft dowe also.

so we put a HKS drop in camshaft on the intake side and new VCT gear, we had the NEW camshaft machined to suit the front bearing modification that was done.

as they were installing new camshaft they noticed that the camshaft was tight around cap number 3 and said it needs to be line honed which means head offf :(

i went down there today straight from work and im hoping a nice polish on the cam cap etc should loosing it up enough to get the correct clearances.

dont wanna sound like a noob but what clearances are recommended just so i can double check there work?

  • 2 months later...

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

    • Which solenoid? Why was it changed? Again, why was this done? ...well, these wear..but ultimately, why was it changed? Did you reset the idle voltage level after fitment? I'm just a tad confused ~ the flash code doesn't allude to these items being faulty, so in my mind the only reason to change these things, would be some drive-ability issue....and if that's the case, what was the problem? Those questions aside, check if the dropping resistor is OK ...should be 11~14 ohms (TCU doesn't throw a flash code for this) ~ also, these TCU designs have full time power (to keep fault code RAM alive), and I think that'll throw a logic code (as opposed to the 10 hardware codes), if that power is missing (or the ram has gone bad in the TCU, which you can check..but that's another story here perhaps).
    • Question for people who "know stuff" I am looking at doing the new intake like the one in the picture (the pictured is designed for the OEM TB and intake plenum), this design has the filter behind the front bar, but, the filter sits where the OEM duct heads into the front bar, and the standard aperture when the OEM ducting is removed allows the filter to pulled back out of the front bar into the engine bay for servicing, a simple blanking plate is used to seal the aperture behind the filter This will require a 45° silicone hose from the TB, like the alloy pipe that is currently there, to another 45° silicone hose to get a straight run to the aperture in the front bar Question: how will it effect the tune if I move the MAF about 100-150mm forward, the red is around where my MAF is currently, and the green would be where it would end up Like this This is the hole the filter goes through  Ends up like this LOL..Cheers    
    • Despite the level up question, actually I do know what that is....it is a pressure sender wire.  So check out around the oil filter for an oil pressure sender, or maybe fuel pressure near the filter or on the engine. Possibly but less likely coolant pressure sensor because they tend to be combined temp/pressure senders if you have one. Could also be brake pressure (in a brake line somewhere pre ABS) but maybe I'm the only one that has that on a skyline.
    • Pull codes via the self-diagnosis procedure. As far as I can tell this is just a sign of transmission issues but not a code unto itself.
    • Hi All, putting the engine back together and everything is perfect except have this plug left over.. any ideas what it is for and where it goes? Is on cold side under the intake plenum *note not a stock plug, as everything has been modified Cheers
×
×
  • Create New...