Jump to content
SAU Community

Recommended Posts

cant the time VCT enables/disables be altered without an aftermarket computer (other than afc4) if so how? cheers

never heard of the AFC4 (apexi item?).

you can enable it and disable it, by unplugging the solenoid. that's how you determine the most optimal rpm point for it to engage, by doing two dyno runs one with and one without.

i'm pretty sure you will need an aftermarket something to control when the vct/vvt/nvcs (whatever you want to call it) is activated/deactivated, whether it be a full replacement ecu or a little piggyback controller.

stock; the vct turns on just above idle rpm and turns off around ~5000rpm'ish. don't quote me exactly on that though.

the power fc guys require the fc datalogit (laptop program) to be able to access the function.

i know that doesn't exactly answer your questions, but hopefully it'll provide a little grounds for discussion.

never heard of the AFC4 (apexi item?).

you can enable it and disable it, by unplugging the solenoid. that's how you determine the most optimal rpm point for it to engage, by doing two dyno runs one with and one without.

i'm pretty sure you will need an aftermarket something to control when the vct/vvt/nvcs (whatever you want to call it) is activated/deactivated, whether it be a full replacement ecu or a little piggyback controller.

stock; the vct turns on just above idle rpm and turns off around ~5000rpm'ish. don't quote me exactly on that though.

the power fc guys require the fc datalogit (laptop program) to be able to access the function.

i know that doesn't exactly answer your questions, but hopefully it'll provide a little grounds for discussion.

Cheers, Yeah meant the AFC Neo, Apexi Air Flow Convertor 'neo', it calls itself number 4 (upgraded from a SAFC2 because i thaught it had VCT altering functions)

Yeah i understand what your saying about how to decide when to activate the VCT, i just now need to figure out how to make it automatically engage at that point.

Ill properly talk to my tuner about it when i get the car ready, just waiting on damn extractors, and loom

Edited by SKiT_R31

is 6200 the rev limiter for the 25de ??? coz thats when mine bounces back.. i thought it was 7500 ??

the engine needs wayy more torque is crap at speeds goin from 5th to 4th just to speed up and usuing 3rd to hold power... anything under 3000rpm is terrible

mine sees 7000 regularly at QR, it tends to taper off around 6800ish anyway

4500-6500 is usually about the thick of it for me, very thick and chunky through there.

i agree, could do with abit of torque, but at the end of the day it's a 2500cc motor. you'll need cubes for torque.

the rb is a fairly revvy motor, and i personally think that's what makes it fun.

with regards to 'under 3000rpm is terrible'

- the high gearing and ratios have something to do with it, especially when you are just cruising around

- i have no dramas getting a decent progressive punch 1st and 2nd on the motorkhana and skidpan.

ah k well maybey because mine is in a R31 the tacho reading might be wrong.. yeah true with the gearing but similar stuff at 100kays... 5th to 3rd.. again..

im doin RB30DE very soon...

wat i was going to ask is...

what series head do i have its a 93 RB25DE the afm has 4 wires if that helps is that S1 or S2 ? yes it has VCT...

i want to buy camshafts of Nengun i belive its cheaper than just jap... which ones are good for midrange power ? keeping in mind it will be for RB30DE..

My limiter with a stock 25DE ecu, was at exactly 6800rpm, now have a Mines ECU with no limiter... - goign to get somthing like a jaycar and set it at ~ 7000-7200rpm (or whever power drops off, dont want to take it much further than that though, it is a 30 block after all)

are you goign to fully balence it, maybe get a new harmonic balencer? dont forget 30e's have bad harmonic issues in mid 7k rev range

being 93 i would have said S1, but 4 AFM wires!?

Edited by SKiT_R31

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

    • Have a look at that (shitty) pic I posted. You can see AN -4 braided line coming to a -4 to 1/8 BSPT adapter, into a 1/8 BSPT T piece. The Haltech pressure sender is screwed into the long arm of the sender and factory sender (pre your pic) into the T side. You can also see the cable tie holding the whole contraption in place. Is it better than mounting the sender direct to your engine fitting......yes because it removes that vibration as the engine revs out 50 times every lap and that factory sender is pretty big. Is it necessary for you......well I've got no idea, I just don't like something important failing twice so over-engineer it to the moon!
    • Yup. You can get creative and make a sort of "bracket" with cable ties. Put 2 around the sender with a third passing underneath them strapped down against the sender. Then that third one is able to be passed through some hole at right angles to the orientation of the sender. Or some variation on the theme. Yes.... ummm, with caveats? I mean, the sender is BSP and you would likely have AN stuff on the hose, so yes, there would be the adapter you mention. But the block end will either be 1/8 NPT if that thread is still OK in there, or you can drill and tap it out to 1/4 BSP or NPT and use appropriate adapter there. As it stands, your mention of 1/8 BSPT male seems... wrong for the 1/8 NPT female it has to go into. The hose will be better, because even with the bush, the mass of the sender will be "hanging" off a hard threaded connection and will add some stress/strain to that. It might fail in the future. The hose eliminates almost all such risk - but adds in several more threaded connections to leak from! It really should be tapered, but it looks very long in that photo with no taper visible. If you have it in hand you should be able to see if it tapered or not. There technically is no possibility of a mechanical seal with a parallel male in a parallel female, so it is hard to believe that it is parallel male, but weirder things have happened. Maybe it's meant to seat on some surface when screwed in on the original installation? Anyway, at that thread size, parallel in parallel, with tape and goop, will seal just fine.
    • How do you propose I cable tie this: To something securely? Is it really just a case of finding a couple of holes and ziptying it there so it never goes flying or starts dangling around, more or less? Then run a 1/8 BSP Female to [hose adapter of choice?/AN?] and then the opposing fitting at the bush-into-oil-block end? being the hose-into-realistically likely a 1/8 BSPT male) Is this going to provide any real benefit over using a stainless/steel 1/4 to 1/8 BSPT reducing bush? I am making the assumption the OEM sender is BSPT not BSPP/BSP
    • I fashioned a ramp out of a couple of pieces of 140x35 lumber, to get the bumper up slightly, and then one of these is what I use
    • I wouldn't worry about dissimilar metal corrosion, should you just buy/make a steel replacement. There will be thread tape and sealant compound between the metals. The few little spots where they touch each other will be deep inside the joint, unable to get wet. And the alloy block is much much larger than a small steel fitting, so there is plenty of "sacrificial" capacity there. Any bush you put in there will be dissimilar anyway. Either steel or brass. Maybe stainless. All of them are different to the other parts in the chain. But what I said above still applies.
×
×
  • Create New...