enzan

Yer I've heard the standard BOV's are really good and I seriously doubt that they are the cause. But I shall test them and the plumbing for them anyway just so we know for sure. First i'll bump the timing up a tad as you suggested and see what happens. I've still only got a mines modified ecu at this stage so tuning is limited, wolf 3d coming soon. Thanks for the advice everyone, I'll let you know what I find.

Alright, well they are a fair bit bigger than the standards so I'm not ruling compressor surge out yet. I'll crimp the vacuum lines to the BOV's rendering them inactive tomoz and see what happens. But I don't understand how different turbo's is going to throw the BOV's out of wack??

Ok, I'll start with the basics i.e tune and see how it goes. I went through all the other threads on this topic and everyone is seems quick to point the finger at the BOV's.

Hmm

Around 1bar I think (factory gauge). But I don't think it's got anything to do with the BOV's, It's barely seeing any boost at all at very light throttle.

Hey everyone, I just finished fitting the GT2860-5's to my R32 gtr and must say they've made a huge difference, the car feels more responsive and comes on boost earlier too. On full throttle it's fine but on really light acceleration and at cruise I now get bad waste gate flutter and surging. I never had this problem with the original turbo's and haven't changed anything other than the turbo's and a bit of metal off the exhaust manifolds. Any ideas?? Help please!!!

Hey everyone, Just thought I'd add a bit more to all the confusion surrounding the Garrett GT2860R-5's and the GT2860R-7's. I recently ordered two GT2860R-5's for my R32 GTR after spending countless hours of research on the two same, yet different turbo configurations. Although the differences between the two are known by most people now, when mine arrived it was back on to the web to find out exactly what I had received as it seemed that all my research had just gone out the window!!. At first I thought I had received the -7's because the compressor housing had .42 A/R stamped on the inside. But after refusing to believe that the people I had ordered them off sent the wrong ones down (especially after I went over and over it all with them and even made them repeat the part number back to me several times to be sure I was getting the right ones) I broke out the measuring stick! As it turns out I had a 44mm turbine exducer (as per the -5's) and a 47.5mm compressor inducer (as per the -5's) but a .42 A/R rated compressor housing as per the -7's......???? Now.. my understanding is this, and correct me please if I'm am wrong..... GT2860R-5 compressor housing .6 A/R with 47.5mm inducer turbine housing .64 A/R with 44mm exducer GT2860R-7 compressor housing .42 A/R with 44.5mm inducer tubine housing .64 A/R with 44mm exducer?? I think... My GT2860R-5 compressor housing .42 A/R (??) with 47.5mm inducer turbine housing .64 A/R with 44mm exducer So as you can imagine this has confused the hell out of me and according to Garrett "sometimes the housings are stamped incorrectly" and they assure me these are -5's and not some dodgy hybrid Garrett mistake. I'm not convinced though, so if anyone has struck this before or has any ideas about what this turbo might be like if the A/R rating is correct i.e if it will it run too hot etc.. I'd be really grateful. It's going to take me all weekend to get them on the car and I really don't want to pull them off again!! Cheers.

2kg (no lower) is ok at idle when the engine is at operating temp, but even then as you increase the revs the oil presure should increase too. If yours doesn't move at all then at a guess I'd say that you have a problem with the sender unit. It's located next to the oil filter and is fairly easy to access. Unplug the wiring at the back of the sender, give the terminals a clean with contact cleaner (solvent) and give it a try. If that fails then I'd be checking the oil presure with a workshop type gauge and if that checks out ok, then another sender unit or an aftermarket sender and gauge.

Hey, Just wanted to fill you in on a small problem that I encountered the other day. Cruising along the highway on my way to work I glanced down at my standard GTR oil presure gauge and freaked when I saw that it was just 2kg at 3500rpm. I was stuck at work and left wondering all day about all the possibilities of what could be causing the low oil pressure. I spoke to someone at Advan and was told that the standard GTR sender units give a lot of trouble and can't really be trusted and also that the N1 oil pumps have a habit of breaking the gear. So as soon as work finished I was under the bonnet attemptng to check my oil presure. I disconnected the sender unit wiring plug and noticed a bit of corrosion around the connector terminals. I cleaned off the corrosion, reconnected the sender and started the car, straight away the oil presure shot up to around 3kg at idle!! And at 3500rpm sits around the 6 - 7kg mark. They are fitted with a rubber boot over the sender plug but in my case was not fitted properly, causing the corosion.