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Turboed 1HZ, experiences and comments??(Comparison with 4M4
Moderators: toaddog, Elmo, DUDELUX
Turboed 1HZ, experiences and comments??(Comparison with 4M4
Hello all,
I’ve just turboed my 99 HZJ105 Auto with a DENCO kit and replaced the stock exhaust system.
I must say I’m quite disappointed with the results. The kit does not seem to provide any boost at all till about 1,600 RPM. From that point on wards the turbo kicks in and I get a full 10 PSI boost at about 3,500 RPM. The kit has made a significant difference in Highway driving but there is no benefit at all in low RPM’s.
I also have a ‘06 intercooled turbo(factory) Montero. Here the turbo provides boost from idle and the Montero can run circles around the turboed 1HZ.
Does anyone have any experiences / comparisons they would like to share?
I’ve just turboed my 99 HZJ105 Auto with a DENCO kit and replaced the stock exhaust system.
I must say I’m quite disappointed with the results. The kit does not seem to provide any boost at all till about 1,600 RPM. From that point on wards the turbo kicks in and I get a full 10 PSI boost at about 3,500 RPM. The kit has made a significant difference in Highway driving but there is no benefit at all in low RPM’s.
I also have a ‘06 intercooled turbo(factory) Montero. Here the turbo provides boost from idle and the Montero can run circles around the turboed 1HZ.
Does anyone have any experiences / comparisons they would like to share?
Of course the Mitsu will get boost right from idle. Those engines depend a lot on the turbo. Don't expect it to last as long as your 1HZ. That engine is stressed out all the time.
Your 1HZ getting boost at 1600 is OK. If you want it to boost sooner, you could try tweaking the wastegate (if it got one) or adding a boost controller, but then you'll be stressing it sooner and it will not last as long as with the "normal" settings. Also, have you increased your fuel ?
If you're after power at low RPM you should consider more reduction (R&P and/or transfer gears)
Your 1HZ getting boost at 1600 is OK. If you want it to boost sooner, you could try tweaking the wastegate (if it got one) or adding a boost controller, but then you'll be stressing it sooner and it will not last as long as with the "normal" settings. Also, have you increased your fuel ?
If you're after power at low RPM you should consider more reduction (R&P and/or transfer gears)
GQ TD42, OME 5" suspension, 3" bodylift, shimmed V6 Pathfinder LSD front, ARB rear, Safari snorkel, custom front and rear bumpers, Nissan 4.625 R&P, 37" MTRs.
Panama, Central America
Panama, Central America
Hello All,
Thanks for the replys. Wish you all a very happy and peaceful new year!
Yes the fuel has been adjusted. The fuel screw has been turned by 3/4 of a turn so that EGT is at about 450 C at full throttle. There is now a very slight smoke on full throttle take off.
Did another test run today with one of my mates 99 4m40 2.8L intercooled turbo stock.
On a straight line I can't even get close to him till about 90-100 KM/H. From that point onward the 1HZ catches up without any problems.
How would a boost controller help in getting boost at low RPM?
Thanks for the replys. Wish you all a very happy and peaceful new year!
Yes the fuel has been adjusted. The fuel screw has been turned by 3/4 of a turn so that EGT is at about 450 C at full throttle. There is now a very slight smoke on full throttle take off.
Did another test run today with one of my mates 99 4m40 2.8L intercooled turbo stock.
On a straight line I can't even get close to him till about 90-100 KM/H. From that point onward the 1HZ catches up without any problems.
How would a boost controller help in getting boost at low RPM?
A boost controller is basically a device that creates a "leak" on the wastegate and "fools" it into "thinking" that it has not reached the set psi where it should open up and stop boosting, thus increasing the boost levels.malinda_um wrote:Hello All,
Thanks for the replys. Wish you all a very happy and peaceful new year!
Yes the fuel has been adjusted. The fuel screw has been turned by 3/4 of a turn so that EGT is at about 450 C at full throttle. There is now a very slight smoke on full throttle take off.
Did another test run today with one of my mates 99 4m40 2.8L intercooled turbo stock.
On a straight line I can't even get close to him till about 90-100 KM/H. From that point onward the 1HZ catches up without any problems.
How would a boost controller help in getting boost at low RPM?
http://en.wikipedia.org/wiki/Boost_controller
Can't your wastegate be adjusted ? I'm no turbo expert, but I think if you need more boost sooner, you'll have to change your turbo's hot side ...
GQ TD42, OME 5" suspension, 3" bodylift, shimmed V6 Pathfinder LSD front, ARB rear, Safari snorkel, custom front and rear bumpers, Nissan 4.625 R&P, 37" MTRs.
Panama, Central America
Panama, Central America
hey mate i had a denco kit on my 1hz with a dts top mount ic and a compensator on the pump with a elec inline pump and wow what a difference. made 13lbs of boost at 2000 with 152rwhp and 1050 lbs of torque so i would have 2 say take it 2 somone who knows how 2 tune it properly.
Luke Doyle - just a basic 200 Gxl : )
thats always the case when the engine is not under any load and free revingmalinda_um wrote:Also I noticed the following:
If I keep the engine in Neutral press the accelerator the turbo does not seem to make much boost. At 4000 RPM only 5 PSI
By on Drive with the vehicle moving at 4000 RPM I get 9.5 - 10 PSI Boost.
Isn't this VERY odd???
alsohulsty wrote:thats always the case when the engine is not under any load and free revingmalinda_um wrote:Also I noticed the following:
If I keep the engine in Neutral press the accelerator the turbo does not seem to make much boost. At 4000 RPM only 5 PSI
By on Drive with the vehicle moving at 4000 RPM I get 9.5 - 10 PSI Boost.
Isn't this VERY odd???
dont free rev your engine to 4000rpm, it makes the toyota gods cry
tuff 75 wrote:hey mate i had a denco kit on my 1hz with a dts top mount ic and a compensator on the pump with a elec inline pump and wow what a difference. made 13lbs of boost at 2000 with 152rwhp and 1050 lbs of torque so i would have 2 say take it 2 somone who knows how 2 tune it properly.
SPOT ON...
send it to a proper tuning mob with a dyuno who specialise in diesels.
it will be a TOTALLY different animal. might cost from $150 to $700
hands and mums dont count!!!
No, it wont boost if it has no loadmalinda_um wrote:Also I noticed the following:
If I keep the engine in Neutral press the accelerator the turbo does not seem to make much boost. At 4000 RPM only 5 PSI
By on Drive with the vehicle moving at 4000 RPM I get 9.5 - 10 PSI Boost.
Isn't this VERY odd???
hands and mums dont count!!!
Thank you for the replys guys!
unfortunately I don't have access to a Dyno (I live in Sri Lanka).
4wdsystems suggest that my 1HZ is under fulled. They recommend increasing fuel further 1/4 turn. If all else fails to play with the wastegate.
Could someone tell me if there is any harm in running a lean mixture? Other than the obvious performance deficit?
unfortunately I don't have access to a Dyno (I live in Sri Lanka).
4wdsystems suggest that my 1HZ is under fulled. They recommend increasing fuel further 1/4 turn. If all else fails to play with the wastegate.
Could someone tell me if there is any harm in running a lean mixture? Other than the obvious performance deficit?
a lean mixture in a diesel can do no harm to the engine whatso-ever. Its completely opposite to a petrol engine, where a lean mixture will cause much higher combustion temperatures and can lead to catastrophic engine failure.malinda_um wrote:Thank you for the replys guys!
unfortunately I don't have access to a Dyno (I live in Sri Lanka).
4wdsystems suggest that my 1HZ is under fulled. They recommend increasing fuel further 1/4 turn. If all else fails to play with the wastegate.
Could someone tell me if there is any harm in running a lean mixture? Other than the obvious performance deficit?
The problem in a diesel is running too much fuel. But aslkong as you keep an eye on your exhaust gas temperatures you will be fine.
earier boost will require more fuel or a turbo change. boost tees or controllers just make more boost which need higher revs. maybe your r is a dud...... there are heaps out there that just arent as good as others and some which are heaps better. mitsu common rail diesels are the shit.... best feeling turbo diesels i have driven, they kee up with the petrols.
turbos are nice but i'd rather be blown
I don't think I can add anymore fuel. With the current setting the car leaves quite a large trail of black smoke on take off. Also if I go full throttle, EGT goes to 500+ at about 100 Kmp/h. So fuel cannot be the problem. The only way I could add more fuel is with a boost compensator and an intercooler. The problem is that the turbo is not doing anything much at all below 2200-2500 RPM. Since most of my weekday driving is in the city, the turbo really is not doing anything at all. I just running an over fueled 1HZ.
Will see what Denco and 4wdsystems have to say about it.
I agree with you about the mitsus. My 3.2L 4M41 boosts from idle and is very very quick. The thing that pisses me off is that even a 99' 2.8L 4m40 (indirect injection) seems to have so much more power at low revs.
Will keep you guys updated...
As always... any comments or suggestions are most welcome.
Will see what Denco and 4wdsystems have to say about it.
I agree with you about the mitsus. My 3.2L 4M41 boosts from idle and is very very quick. The thing that pisses me off is that even a 99' 2.8L 4m40 (indirect injection) seems to have so much more power at low revs.
Will keep you guys updated...
As always... any comments or suggestions are most welcome.
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