Boost problems

[Shaun_McL]

Hey Guys,

Anyone out there encountered (and solved) the following problem;-

I have a late R32 GT-R equipped with a HKS EVC 2 boost controller. I've owned it for a while now and after fitting a microtech LTX12 and tuning it makes 260rwkW on around 17psi, so it's obviously pretty healthy mechanically.

Problem is though, the power surges in 3rd or higher under moderate to heavy acceleration, annoyingly, making the car feel far slower than 460hp, when boost is controlled by the EVC (not, though, when the EVC is in 'off' [green or 'monitor'] mode, and boost at standard wastgate actuated levels). It would probably do it in 1st and 2nd gear too, but you tend to not stay in them for long when you're up it for rent.

I assume that this is caused by the solenoid in the EVC not pulsing the boost signal properly to the wastgate actuators. I do have the manual [$20 for a piss-poor copy; thanks BDS's- not] and have followed every setup/trouble shooting step;-

*Wastgate type is set correctly

*Unit has been calibrated as per instructions, twice (could it be any more tedious)

*Everything seems connected properly, as far as I can tell

*The filters to the solenoid unit are dead clean

*The unit is in the same place, but replacing, the factory solenoid (so heat shouldn't be a problem)

*Even tried setting the unit up with learning function cancelled, in 'manual' mode

I went back to BD4's and Paul had a fiddle, mentioning some stuff about base settings, offset, overboost and all that (didn't want to road test though). Anyway, I made the recomended changes and initially it seemed to work, but I, obviously, couldn't really give it any stick around Gladesville in 3rd gear. When I got out onto the freeways, I still had the same problem. None of the "Experts" seem to know or care how to fix it ("Hey, how 'bout we supply and install and SooperBoost Y2K for ya"), like most of you, I've already spent a packet on the car and would just like to solve something with out shelling out cubic dollars for once. Any help will be gratefully received.

Cheers,

Shaun.

[RBVS]

how do you know its boost control that is making the power surge, Is the boost fluctuating up to 17psi?

if so at what revs, whats happening. need to know more than power is surging.

I would firstly test all the mencanical aspects of the boost control system first.

this being the actulators and waste gates. just run a hose from the plenum to the actulators with out anything T'd into it. this will give the lowest boost posible but there will be nothing to cause a surge with fluctuating boost levels.

if the power is on-off when run like that then its not the hks evc.