Jump to content
SAU Community

Recommended Posts

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.

Link to comment
https://www.sau.com.au/forums/topic/52933-only-for-the-cluey-ones/
Share on other sites

Hey SydneyKid,

Yeah the car has AFM's in place (for the cops), but they don't do anything now, since the plug'n'play LTX12 is running in a 'Throttle vs TPS' configuration.

Also, after going through calibration procedure (eg. reset) the car seems to hold more consistent boost for a little while.

Was the Microtech tuned for the higher boost levels?

I'm no expert, and I'll readily latch onto the latest flavour-of-the-month condition, but it sounds like compressor surge at the higher boost. Mine was doing it while tuning the Wolf yesterday, simply dial timing and / or fuel into it to cure it.

Yeah sure was. Mark from MRC Dyno in Castle Hill (good guy- if you need a tuner) tuned the car on standard boost and then at a higher (just under 16psi) level. He had a smooth power curve on the DynoDynamics read out when I got there, then, after we made some adjustments to the boost and re-tuned (and went through the calibration procedure on dyno), the power curve was fuzzy at the top where the boost fluctuates.

I'm pretty sure it's not compressor surge for two reasons, first, even with the EVC set to 'on' and adjusted down to near standard levels it still happens.

Secondly, not having changed the turbos in any way, their low speed airflow characteristics wouldn't have changed, and boost only gets above stock maximum once over 3500rpm.

If it helps, the only other mods that effect power are an ARC airbox with K&N filter, a set of front pipes, a hi-flow cat, and a full 3.5" exhaust. Anyone still interested in this?...

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.

So power surges means that boost is increasing / dropping. Whereabout are you taking your boost pressure sample from, and reading boost how, a gauge?

Boost pressure sample for EVC is tee'd into the fuel pressure vacuum line (only way to get a vacuum reading for EVC, since this connects to a section of the plenum that is behind the throttle bodies). Boost reading from EVC. Boost doesn't change much, but it is noticeable.

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

    • Seat of the pants assessment of the new intake: The car is way less "doughy" when hitting the loud pedal, especially off idle when stopped or in traffic, I did use a cheapo lazer thermal thingo to measure the temp around where the pod filter got its air, it was between 55 - 60°C, in saying this the car was shut off and not moving, so the OEM intake pipe was not supplying any fresh air to where the pod was when the car was at least moving A weird bonus was induction noise on the throttle in the cabin increased a bit,  I was worried that I was actually going to lose some of that induction noise I love so much, outside though, when I got the daughter to do a WOT drive by pass for me, the induction noise has increased alot when on the throttle, not quite ITB doort, but well up there I'm extremely happy with the results and have been exploring the country roads in the region  As for house mods: 1.New front fence is up and is awesome, it really upgraded how the joint looks from the street, and the added security is nice 2. Electricians have replace some interior lights, and with more lighting in the garage, a few new motion detecting lights out the front above the garage, front room, and at the front door, which I have already found heaps helpful coming and going, also now has fancy pants CCTV all round the house The only hold point for power though is the solar and batteries due to supply issues, although this will happen over the next few weeks 3. I have done a heap of landscaping out the front and I'm almost ready to do a new small retaining wall with some nice blocks to replace the brick and cemented in rocks around the raised garden beds cemented in river stone "was the fashion at the time" the house was built. I currently have a pallet of retaining wall blocks and 2 bulka bags of 20mm blue metal to replace the wood chip that is in the raised garden beds around the house 4. I now have 3 big raised garden beds for out the back to grow some vegetables, about 70cm high, 200cm long and 100cm wide 5. My 2 compost bins are already pretty full with brown, green and kitchen waste from the landscaping I'vedone so far, but they will probably take a few months to break down, so anything else that gets chopped, trimmed, and kitchen waste will just start filling the base of the raised garden beds to about 30cm before I start throwing 40cm of good compost, and stuff, for the vegetables to grow in, I'll need a few ton of compost and soil, but the local supplier can sent me bulka bags of the stuff Basically the logs, wood chips and a few strategically placed rocks for drainage, will give the beds some good organic materials down low to break down over time, and they will hold moisture during the warmer months to save the water in my big arse water tank if we don't get alot of rain So, all in all, the car and house mods are going well, and I'm really enjoying being retired, I sleep in too 0700 and slowly plod around inside until I feel like actually doing anything, and only work in the yard for as long as want, which has actually been alot over the last few weeks,  although when you look at it, it seems that not a huge amount of work has been done,  until I look at the before I started the work pics Happy days and good times indeed 
    • hahaha yeah. Plan is to get side skirts and probably just rear pods. But going to do them one-by-one. I've got a set that I really like from RHDJapen, but that one isn't shipped to AU. So need to find someone who can get it for me
    • Here's an idea, answer the questions I asked you as they are trying to work out WHY the LSD will be binding up in a straight line.
    • You haven't driven many modern cars then have you? Most of them have sfa steering feel with their stupid electric bullshit steering systems.
×
×
  • Create New...