Offroad-Express

tweake

the other option is to find a qt32t, tho may need gearbox and all. can't remember the differences in bellhousing.
its a stronger engine but you will need to change the injection pump as most are ecu controlled.

tweake

the down side of connecting it to the wastegate line is that it can over fuel for a little bit if its tuned fairy hard. but biggest thing is if there is a leak downstream of the turbo. for eg if you split a joiner (or an IC) you will be getting a lot less boost at the engine but the injection pump w...

tweake

i tend to follow the patrol zd30 due to the navara also using the zd30, but in lower powered version that doesn't have a lot of the issues the patrol/terrano version does.

tweake

might pay to check the operation of the solenoid or what fuel goes where. if solenoid is open in normal use (engine hot) then theres probably a restriction on the return to the tank. this may be a setup for cold areas only. having hot fuel go straight back into the pump inlet is not good in a warm-h...

tweake

As above there is no accurate diagnosis as to why it happens but there are some very obvious things that don't help the situation. The zd30 is a high strung engine from the get go...forced to meet stricter emissions controls but still make power that the market desires/demands it was a new design a...

tweake

Some terrano's have a 3 litre engine that has a reputation as a grenade. What is it that goes bang and why? no one really knows for sure. nissan have never said there was any fault let alone the cause. theres several things. one is piston or rings issue. there is a number of piston/ring changes ove...

tweake

So tweake you are correct as it block the return flow, however I don't see how this can cause damage, my background is electronics not mechanics so please bear with me, thanks it sounds similar to what mitsi (i think) uses. injection pumps pump a large amount of fuel through the injection pump and ...

tweake

Is there any long term problem (to the engine) to drive it with the Timing Avance Solenoid always ON? quite possibly. i'm not sure on the way those ones work. i suspect its a block the return flow setup. constant use means the IP won't get proper cooling. how did you set the pump injection timing? ...

tweake

as above, probably old oil or the wrong oil in it.
its not uncommon for people and mechanics to use incorrect spec oil.

tweake

boost just increases effective runner length, all the gains in volumetric efficiency are to be had under 5000 rpm by what i can see. like everything rather than just bat theory an research around i'll just get it done an feel out how it goes by the seat of the pants. if it works for nissan on the l...

tweake

I can see a problem with tuned length runners and that is they will only be tuned for one engine speed. As the frequency of the pulses increases the runners would need to be shorter to get the same effects. by mem from some very old books, intake tuning gives about effects about a 500 rpm band widt...

tweake

Which brings me back to supplementing with an electric?, and can I spin this (plunger?) in a lathe or is it too much like real work? I'm not meaning to be a smart-ass, just trying to get my head around this. machining the plunger? very tight tolerances and rather importantly the surface finish. rea...

tweake

MihiT wrote:
tweake wrote:no point increasing crack pressure, that might cause other issues.

I must ask, issues like what?

like a worn pump failing completely due to the extra work the pump has to do.

tweake

a big turbo I have ,plus a balanced engine, the high big volume intake all add up to a reasonable system, exactly, if you get everything matched it works well. of interest is one of the things old mav (and others) talks about is the small things that add drive ability rather than outright power. th...

tweake

tweake pressure waves like sound waves will diminish with collisions with solids and other waves , losing potential energy that could assist in charging the cylinder. like a tunnel rammed petrol motor you are utilising these pressure waves to increase v.e an essentially get boost for free. on mr tu...

tweake

no point increasing crack pressure, that might cause other issues. tuning NA diesels is tricky. you need egt gauge for it. my understanding is they get hot really quick. also you have to figure what your leeway is. eg dirty air filter reducing air flow may be enough to cause piston/head failure. if ...

tweake

yeah read old mavs threads and definitely had a search for tuned length manifolds, for something that has been done apparently struggling to find evidence. problem with the short runners is the pressure wave could be oscillating away from the opening valve , causing your intake charge to have to ov...

tweake

can't argue the heads badly designed if no one has run a tuned manifold to suit?! as i said before tuned manifolds have been made. theres tons of them around. just about everything has been done to those engines. i just don't see the point of repeating other peoples failures. if you have something ...

tweake

you guys banging different cam profiles at these thigns yet? always miffed me that people don't seem to touch cams or cylinder heads when tweaking diesels in nz, it's always just about max fual and more boost i can't recall off hand what the situation is with the td42 cams. i suspect the stock cam ...

tweake

from what i gather, the issue is head design. for some reason the long runners don't work well so they tend to focus more on just outright flow. the short runners match the head and tend to flow better.
build a new head design and i'm sure tuned intake would work better.

tweake

short runners are perfect if you plan on making power at 10000rpm but the td42 is fairly rev limited so will benefit a longer runner to achieve higher v.e , and with boost a runner can be shorter to achieve the same v.e. disregarding the numbers check an om606 manifold or a banks power manifold no ...

tweake

grytvikken wrote:. could you explain your reason for asking about the return line? Im wondering if the pump is done. cheers for opinion

see if its actually going through the pump or simply not injecting.

tweake

any fuel coming out the return fuel pipe when you crank?

i can't remember if those had the mesh filter in the fuel inlet.
but vege oil/ bio diesel can gum up pumps. have some pics of a VE which was stuffed due to it.

tweake

i think its time for the next evolution. a quick google search will reveal a miriad of 24valve diesel in europe making up to 550hp. is that even feasible on a td42? they are not far off that. however they are breaking cranks rather regully which is imposing a limit. the 2 valve per cyl head does ma...

tweake

found the fault the code is 52 52 Knock sensor (KS) -circuit Wiring, KS, ECM,,,, now is this easy to fix? and thanks all with my questions! i don't have a book on them to check with. check the obvious, if wires been hit, corrosion on pins. otherwise change sensor. also on those age vehicles is ecu'...

tweake

Thanks mate.i did take it for a scan but nothing showed up.so must be a electrical fault in a senser im hoping anyways! if it was a sensor fault it would store a code. it could easily be that the code reader doesn't work with such old systems. hence i would go pull the codes the old fashion way. sh...

tweake

i don't know the petrols sorry.

all i can suggest is jump onto the surf forums and find the method to get the codes manually. that way you can do it yourself in case it was a code reader issue.
possible someone has written down if there is any other non-ecu item that can trip the engine light.

tweake

check water in the fuel sensor. assuming diesel.

otherwise you need to let us know what engine you have and also exactly which light came on and what was happening at the time it came on.

tweake

slidenyo wrote:well thats some learning haha im off to find my ve manual and reread the bastard

theres also a bosh manual on the ve pump addons, eg boost comp, altitude comp, idle ups, cold start, pilot injection etc.
i've got a copy some where......

tweake

also any compensated pump can be tuned within reason to suit any turbo through manipulation of the fuel pin seat pressure and smoke screw. thats the easy part. (tho knowing what plunger works with what cam and how to set the regulator etc takes some know how) the hard part with VE pumps is matching...

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