Jump to content
SAU Community

Recommended Posts

That is not always the case. The leak could be slight enough that the turbo can make more boost to keep the same boost level. Only difference would be more lag (which I have) and the turbo would be running a lot harder.

I had the blow off valve blocked off for the 279kw dyno above and that still dropped boost. Only difference since then is 20rwkw. Oh well I will just block off the blow off valve and go for a drive tonight.

Sorry I should have said may cause boost to drop off :P

I have a GTR BOV, PM me if you are interested in buying it!

ditch the pile of shit stock bov and run no bov. there over rated and being such a soft spring they will be opening as its ramping up on boost.

My tuner Trent said that the R34 ecu has more smarts built into it and is very hard to get perfect driveability without a bov. He much preferred me to run a bov that returned to the intake.

I thought the stock bov had proved itself to be quite good for 300rwkw??

I am going for the standard engine bay appearance (cause of stupid vic rules) and driveability is very important to me.

ditch the pile of shit stock bov and run no bov. there over rated and being such a soft spring they will be opening as its ramping up on boost.

we usually make over 290-300 on std bov no issues, so they generally are very good. Drive ability and return to idle on the R34 is far superior with it too. The r34 graphs posted above @ 290rwkw are all with std BOV and piping. I advised jeff to bring in a block in plate next time after he had checked all his cooler pipe joiners just in case his was faulty bt they generally are not an issue.

we usually make over 290-300 on std bov no issues, so they generally are very good. Drive ability and return to idle on the R34 is far superior with it too. The r34 graphs posted above @ 290rwkw are all with std BOV and piping. I advised jeff to bring in a block in plate next time after he had checked all his cooler pipe joiners just in case his was faulty bt they generally are not an issue.

Thanks Trent, does a 'block in plate' do the same thing as that rubber cap you put over the bov last time? I was going to put that on tonight and go for a spin.

I was quite happy with the 279rwkw last time with more response, I would like to get there first and then look at improvements later on. The bov is one thing that has changed since then and is also very easy to work on. Taking off front bar and checking/replacing joiners is obviously a lot more work.

What do people think of this bov? Will this perform the same as a standard one ie leaking at idle etc?

http://cgi.ebay.com.au/TURBOSMART-KOMPACT-...=item2c57d74ad6

I love turbosmart products, they have always served me well in the past.

from what i can tell "ABE's" 290kw run has more power and torque pretty much everywhere than the 3071r.. i like that turbo :P

it is also running 3psi less and making basically the same power, be very interesting to see the ceramic bearing version overlayed on the gt3071

actually Id love to see all of your turbos overlayed with similar boost levels, makes it much much easier to compar

If you guys are worried about your BOV do what I did and make a small gasket with a 1cm hole in the middle, it stops the BOV opening as soon and as much, result is it only opens when you completely close the throttle, won't open on half throttle, also when it does it doesnt make a ridiculous PSSSHHHHH noise, it is much quieter and will get a tiny bit of flutter on low throttle changes.

Edited by Rolls
it is also running 3psi less and making basically the same power, be very interesting to see the ceramic bearing version overlayed on the gt3071

actually Id love to see all of your turbos overlayed with similar boost levels, makes it much much easier to compar

If you guys are worried about your BOV do what I did and make a small gasket with a 1cm hole in the middle, it stops the BOV opening as soon and as much, result is it only opens when you completely close the throttle, won't open on half throttle, also when it does it doesnt make a ridiculous PSSSHHHHH noise, it is much quieter and will get a tiny bit of flutter on low throttle changes.

i wouldnt recomend that, my car had that from when it came from japan and i had alot of problems tuning it with that stupid plate in there, once we found the problem and chucked it in the bin i made 20rwkw more! and afrs were a flatline :P

i wouldnt recomend that, my car had that from when it came from japan and i had alot of problems tuning it with that stupid plate in there, once we found the problem and chucked it in the bin i made 20rwkw more! and afrs were a flatline :P

Did you reinstall the bov afterwards? I cant see how a bov restrictor plate could reduce power? Affect driveability sure.

Did you reinstall the bov afterwards? I cant see how a bov restrictor plate could reduce power? Affect driveability sure.

yeah all it is going to do is cause the afm signal to be screwing when you back off the throttle making a pop or two, however with my suggestion it still lets air out the bov, just slower and doesn't open as easily so you avoid the pops and the annoying effects of running a bov.

EDIT: when there is NO pressure on either side of the BOV, does the spring hold it open or closed by default?

Closed, the BOV will start cracking open around 5 psi without the vac hose hooked up. When hooked up properly the boost line from the plenum will help hold the BOV shut.

Thats why I hate bovs its one more thing to eliminate a problem from if its gone but that sucks how with the r34s its harder to get tuned for.

All MAF cars are harder to tune with no BOV, R34s aren't particularly worse than any other nissan motor, the reversion plays funny buggers with the MAF signal causing it to dump fuel, you need to stuff around with tps fuel trim maps etc.

All MAF cars are harder to tune with no BOV, R34s aren't particularly worse than any other nissan motor, the reversion plays funny buggers with the MAF signal causing it to dump fuel, you need to stuff around with tps fuel trim maps etc.

Yeah before my tune it stalled all the time but yeah after tune never stalled on me so if there the same as r33 it can be done.

Thats why I hate bovs its one more thing to eliminate a problem from if its gone but that sucks how with the r34s its harder to get tuned for.

BOV's aren't a problem they prevent them.

+1 ^

You know what often causes problems? Motors. Let's rip that out just to prevent having any problems with it.

Well if you got the chance to eliminate one problem from the list why not do it? They dont cause probelms if the car is tuned to run without it. Anyway up to the individual if you want to run it then thats up to them but personally I dont see a point to them.

Ok I blocked my bov off and it is still laggy and not making the power it should. It used to come on hard at 4,000rpm, now it only starts at 4,500rpm. It feels the same as with the bov plumbed in.

Bugger thats the bov off the list.

Looks like Trents boost leak idea is the next thing to check. I still have my boost leak tester from my previous car so will give that a go as soon as I can find the pump. Any other ideas?

Harey mate why are the diff ratios different on the new sheet??

Have to ask Trent, he did some process to tune it. Dont know much more about it.

I just know the car feels a lot laggier and less power. Dont even really need a dyno but the dyno backs it up how it feels.

Harey mate why are the diff ratios different on the new sheet??

we were comparing different cars so the folder thats opened last will be shown.

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

    • The average previous owner for these cars were basically S-chassis owners in the US. Teenagers or teenager-adjacent. I often tell people that neglect is easier to fix than something that was actively "repaired" by previous owners.
    • Update 3: Hi all It's been a while. Quite a lot of things happened in the meantime, among other things the car is (almost) back together and ready to be started again. Things that I fixed or changed: Full turbo removal, fitting back the OEM turbo oil hardlines. Had to do quite a bit of research and parts shopping to get every last piece that I need and make it work with the GT2860 turbos, but it does work and is not hard to do. Proves that the previous owner(s) just did not want to. While I was there I set the preload for the wastegates to 0,9bar to hopefully make it easier for the tuner to hit the 370hp I need for the legal inspections that will follow later on. Boost can always go up if necessary. Fitted a AN10 line from the catch can to the intake hose to make the catchcan and hopefully the cam covers a slight vacuum to have less restrictive oil returns from the head and not have mud build up as harshly in the lines and catch can. Removed the entire front interior just shy of the dashboard itself to clean up some of the absolutely horrendous wiring, (hopefully) fix the bumpy tacho and put in LED bulbs while I was there. Also put in bulbs where there was none before, like the airbag one. I also used that chance to remove the LED rpm gauge on the steering column, which was also wired in absolute horror show fashion. Moved the 4in1 Prosport gauge from sitting in front of the OEM oil pressure gauge to the center console vents, I used a 3D printed vent piece to hold that gauge there. The HKB steering wheel boss was likely on incorrectly as I sometimes noticed the indicator reset being uneven for left vs. right. In the meantime also installed an airbag delete resistor, as one should. Installed Cube Speed premium short shifter. Feels pretty nice, hope it'll work great too when I actually get to drive. Also put on a fancy Dragon Ball shift knob, cause why not. My buddy was kind enough to weld the rust hole in the back, it was basically rusted through in the lowermost corner of the passenger side trunk area where the wheel arch, trunk panel and rear quarter all meet. Obviously there is still a lot of crustiness in various areas but as long as it's not rusted out I'll just treat and isolate the corrosion and pretend it's not there. Also had to put down a new ground wire for the rear subframe as the original one was BARELY there. Probably a bit controversial depending on who you ask about this... but I ended up just covering the crack in the side of the engine block, the one above the oil feed, with JB Weld. I used a generous amount and roughed up the whole area with a Dremel before, so I hope this will hold the coolant where it should be for the foreseeable future. Did a cam cover gasket job as the half moons were a bit leaky, and there too one could see the people who worked on this car before me were absolute tools. The same half moons were probably used like 3 times without even cleaning the old RTV off. Dremeled out the inside of the flange where the turbine housing mates onto the exhaust manifolds so the diameter matches, as the OEM exhaust manifolds are even narrower than the turbine housings as we all know. Even if this doesn't do much, I had them out anyways, so can't harm. Ideally one would port-match both the turbo and the manifold to the gasket size but I really didn't feel up to disassembling the turbine housings. Wrapped turbo outlet dumps in heat wrap band. Will do the frontpipe again as well as now the oil leak which promted me to tear apart half the engine in the first place is hopefully fixed. Fitted an ATI super damper to get rid of the worn old harmonic balancer. Surely one of the easiest and most worth to do mods. But torquing that ARP bolt to spec was a bitch without being able to lock the flywheel. Did some minor adjustments in the ECU tables to change some things I didn't like, like the launch control that was ALWAYS active. Treated rusty spots and surface corrosion on places I could get to and on many spots under the car, not pretty or ideal but good enough for now. Removed the N1 rear spats and the carbon surrounding for the tailpipe to put them back on with new adhesive as the old one was lifting in many spots, not pretty. Took out the passenger rear lamp housing... what do you know. Amateur work screwed me again here as they were glued in hard and removing it took a lot of force, so I broke one of the housing bolts off. And when removing the adhesive from the chassis the paint came right off too. Thankfully all the damaged area won't be visible later, but whoever did the very limited bodywork on this car needs to have their limbs chopped off piece by piece.   Quite a list if I do say so myself, but a lot of time was spent just discovering new shit that is wrong with the car and finding a solution or parts to fix it. My last problem that I now have the headache of dealing with is that the exhaust studs on the turbo outlets are M10x1.25 threaded, but the previous owner already put on regular M10 nuts so the threads are... weird. I only found this out the hard way. So now I will just try if I can in any way fit the front pipe regardless, if not I'll have to redo the studs with the turbos installed. Lesson learned for the future: Redo ALL studs you put your hands on, especially if they are old and the previous owners were inept maniacs. Thanks for reading if you did, will update when the engine runs again. Hope nothing breaks or leaks and I can do a test drive.
    • No those pads are DBA too  but they have colors too. I look at the and imo the green "street" are the best.
    • I’m not sure what happened I told them about sonic tunes free OTS tune and the next the I know .. I was booted..   To funny 
×
×
  • Create New...