Turbo question------lots of options

[NCpaj]

Well, ive just been doing some reading.

i was just wondering the 2 articl;es in 4wdm on turboing a 1hz, i hope to get a 1hz in a year and turbo it. i was just wondering what your opions are.

-turbo and intercool.
-turbo and boost compensate

-im not really worried bout the money side, more the whole power,longevity and fuel economy(assume for both all the usaual has been done like zorst and injectors)

-------------------------
can you turbo and intercool and boost compensate?is it worth it?

[its aford not a nissan]

do both

[GQ TROL]

As above, do everything. Turbo, aneroid, intercooler.

Without aneroid it overfuels down low, and runs out at the top end. Intercooler allows for cooler and denser air charge. All good things.

[HotFourOk]

Yep, if money isn't a huge concern do it all. As said, you will have fuelling issues without a boost compensator.

[Toy80Diesel]

If money isn't a worry, of course do it all.

But from my personal experience, my 1hz has just been turbo'd a week ago and I'm very happy with the result. I had AXT fit the turbo and exhaust. Didn't go for the intercooler or aneroid/boost comp.
The car actually smokes less, so I don't think its overfuelling at idle and this would cause more smoke at takeoff. (Anyone can correct me if I'm wrong here but this is what I've heard & read)
As to whether its lacking fuel up high I dunno. Without the compensator, the car is fueled to a happy medium. I would have gone for the air-glycol barrel cooler before doing the aneroid. Only time I would fit the aneroid is if I was concerned about the pump's condition as it needs to come off for aneroid fitment. I've read somewhere it can be done without but thats a bit of a dodgy shortcut IMO.

Just my 2 cents.
P.S. I'm happy with the 45% kw increase and 50% torque.

[HotFourOk]

If its not overfuelling at idle, it is no doubt not getting enough fuel at high boost levels. This is why an aneroid is used, to proportionally increase the fuel rate with any boost increase.

[udm]

Ive got the feeling that I will be fitting an aneroid soon, I cant seem to get the egt's any higher than 450c, (the pump's fuel adjustment screw has already been turned atleast 1 full turn, maybe it needs a little more), so thinking, probably an aneroid will fix the low fuelling issue.

Ulises

[Tiny]

I have a mate who had one of the first 100s 1hz, got it turboed, runing 18psi, didnt intercool it, but temp at seemed ok most of the time, and went like the clappers, towing a small tinny the hill from the brookin bridge it died in the arse and pumped a load of white smoke out the back.

turns out the thing had 4 of the 6 pistons cracked badly and the other two had signs of cracks forming.

it over fueld badly at idle \ low revs, but was dynoed and tuned and had recently had a check up \ retune and dyno

had 160k on the clock,serviced reguality, $4500 for a basic rebuild, basically run new pistons through it just to get it on the road and sold it(bought a nissan after 15 years of owning toyos)

if you do the job properly it will last for ever, but spend the $$ and get it done right

[KiwiBacon]

An aneroid (boost control device) is only for smoke control. They don't give you any more fuel than the fuel pump can deliver without one.

What do you mean by "not enough fuel" with no aneroid?

Diesels run lean, it's what they do. You only put in more fuel if you want more power (and the engine can handle it).

[KiwiBacon]

I have a mate who had one of the first 100s 1hz, got it turboed, runing 18psi, didnt intercool it, but temp at seemed ok most of the time,

Running 18psi with no intercooler, your intake temps will be over 130 deg C.

[Tiny]

I have a mate who had one of the first 100s 1hz, got it turboed, runing 18psi, didnt intercool it, but temp at seemed ok most of the time,

Running 18psi with no intercooler, your intake temps will be over 130 deg C.

like a said SEEMED ok

I told him plenty of times that he needed an intercooler, he didnt listen

[mule75]

100 series 1hz's have lighter pistons and different slightly different combustion chambers. one of my mates did the late 1hz piston crack thing too. motor was about 50-60k old.

[KiwiBacon]

I have a mate who had one of the first 100s 1hz, got it turboed, runing 18psi, didnt intercool it, but temp at seemed ok most of the time,

Running 18psi with no intercooler, your intake temps will be over 130 deg C.

like a said SEEMED ok

I told him plenty of times that he needed an intercooler, he didnt listen

It's not a problem as far as engine longevity. But you can get more air into your engine and much better efficiency running about 12psi and an intercooler.

Also each degree in your intake adds about a degree to your exhaust temps. That restricts how much fuel you can burn (without hitting dangerous EGT's).

Keep in mind most factory turbo engines run oil cooling jets onto pistons to cool the undersides. Converting a non turbo engine leaves you lacking in such areas.

[mule75]

how could an aneriod give you more fuel?? or does it allow you to wind your pump in to its max without overfuelling down low?? i don't have one i just adjusted my pump screw in and then backed it off untill it stopped blowing smoke under boost. will i gain any performance or is it just to stop it from smoking???

[mule75]

I have a mate who had one of the first 100s 1hz, got it turboed, runing 18psi, didnt intercool it, but temp at seemed ok most of the time,

Running 18psi with no intercooler, your intake temps will be over 130 deg C.

like a said SEEMED ok

I told him plenty of times that he needed an intercooler, he didnt listen

Keep in mind most factory turbo engines run oil cooling jets onto pistons to cool the undersides. Converting a non turbo engine leaves you lacking in such areas.

ihz's have piston coolers

[KiwiBacon]

how could an aneriod give you more fuel?? or does it allow you to wind your pump in to its max without overfuelling down low?? i don't have one i just adjusted my pump screw in and then backed it off untill it stopped blowing smoke under boost. will i gain any performance or is it just to stop it from smoking???

Aneroids are only for smoke control.

They also give you a little more turbo lag, the extra fuel which creates the smoke helps to spin the turbo up quicker.

[HotFourOk]

how could an aneriod give you more fuel?? or does it allow you to wind your pump in to its max without overfuelling down low?? i don't have one i just adjusted my pump screw in and then backed it off untill it stopped blowing smoke under boost. will i gain any performance or is it just to stop it from smoking???

Aneroids are only for smoke control.

They also give you a little more turbo lag, the extra fuel which creates the smoke helps to spin the turbo up quicker.

So what you're saying is that my car will go better if I removed the aneroid? But it will produce more black smoke...

[GQ TROL]

So what you're saying is that my car will go better if I removed the aneroid? But it will produce more black smoke...

Not quite that simple. The fuel delivery on a turboed engine without an aneroid can only be tuned to give an average performance across its range. This means its getting more fuel than it needs down low (black smoke off idle), and not enough fuel up top (leans out, runs out of legs). Because if you tuned it so it had enough fuel up top, it will over-fuel considerably down low with even more black smoke.

So an aneroid allows a balanced fuel delivery across the entire range. It limits the fuel down low (and yes as a result will be a bit of lag) but provides a better balance of fuel up top.

The aneroid is boost dependant only, so as boost increases so too does the fuel....up to the max fuel setting.

[tweak'e]

aneroid/boost compensator basicly helps stop it overfueling a low/off boost. its dosn't actually allow more fuel. think of it as a fuel limiter. it simply limits the fuel untill the boost is high enough. you can tune the aneroid as well to suit diffent applactions.

for a atmo motor with turbo added you might want to keep boost down and keep fuel at STOCK level. it will get a little bit more power and better fuel economy without risking the motor, exspecially if its not built to handle the extra power/heat.

KiwiBacon.. just remember we have a no engine smoke law in NZ now. cops can put you off the road for a smoking to much.

[KiwiBacon]

Not quite that simple. The fuel delivery on a turboed engine without an aneroid can only be tuned to give an average performance across its range. This means its getting more fuel than it needs down low (black smoke off idle), and not enough fuel up top (leans out, runs out of legs).

I disagree with that statement about "not enough fuel up top".

A mechanical fuel pump gives your engine a maximum amount of fuel per cylinder stroke.
If you're running a wastegated turbo (as almost all are in 4wd's) then your boost has a set limit which will probably be reached by about 2000 rpm.

As your engine passes 2000 rpm, it already sees the most boost it will get and the aneroid is already fully open.
As you get higher in the revs your engines volumetric efficiency drops (engine consumes less air per revolution) which can be seen on an EGT gauge as the temperature rising with rpm. It is not "leaning out" (no such issue on a diesel), it's getting richer.

This means your engine can burn less fuel per stroke at higher rpm than it can in the middle of it's torque range. Any attempt to give it more fuel with higher rpm will melt pistons.

Aneroids have nothing to do with rpm and cannot increase fuel with revs. They are only a boost device.

Tweake, my truck doesn't smoke and I'm keeping it that way. But I've found my factory aneroid settings were hideously conservative and gave drivability issues offroad.
Tweaking the lower fuel limit on it helped a lot.