Outer Limits 4x4 Board

Did one couple of weeks ago on a mate’s povo pack 80 that he put a GXL cluster into, (what a pain in the bum that turned out to be)
Solder wire into alternator off one of the three phases at the diode pack buy a speedo corrector kit from jaycar KC5435 $55 +freight assemble the kit and calibrate to ...

one weekend ill hook up my in/hg gauge and make a video showing boost at idle.

U only have to listen to the thing running to know its already spooled at idle..

That would be impressive, would like to see that.
Even 1.4 meters of water head in a small clear hose would be proof
enough and easy to ...

???? 2 Psi at idle ????
What A/R exhaust housing are you using?
Where are you measuring boost pressure and what with?
What do you refer to as "idle"?
I dont understand how this is possible........that is awesome if you are getting 2 Psi out of a GT2876 at idle on a 1HZ!!!

All the info on my ...

2psi at idle

full boost 20psi at 2500

When i was playing with boost levels i maxed out a 30psi gauge at 2800

When i mapped this turbo setup, the turbo/engine configuration would become inefficient at just over 50psi...

???? 2 Psi at idle ????
What A/R exhaust housing are you using?
Where ...

mickbeny wrote:Hi all...The 1hz is the wrong engine to be modifying to be squeezing big HP out of even if money is no object.Start with any of the factory turbo engines as a good foundation.

Am I missing somthing guys, BigBoy said a factory 4.2 turbo diesel. So that sortof rules out 1HZ's in Aus does'nt it ?

I have a factory turbo 80 auto 1HDFT with gas,garret and water to air no pump mods other than tweeking the aneroid, boost at about 24 psi doing just under 200HP at the wheels with mild EGT's, oil stays fairly clean change at 5K dark by then but not black like most 1HZ's that I have seen
So in my ...

YES! These engines have a bad habit of lunching BEB due to poor quality bearings being used in the factory. Aftermarket ACL bearings are a good alternative to OEM parts.

ACL Duraglide 780 are definately the way to go part No 6B8396-STD
Yeah the Toyota bearings have a range of sizes for standard ...

Good reading mate :) Yep will get a new roller turbo. Do you put this spacer under the diaphragm, and how thick does it have to be :? Am avare of the little spring loaded pin, must be careful not to drop it.

Will check the fuelfilter also, are there another filter/ a screen in the pump somewhere ...

Hidatid wrote:I was told this is a good turbo for the 1hz any thoughts?

In my opinion you will be changing gears before you make any useable boost.

You will probably find that the turbo is well out of its efficiency range, pumping hot air, which is less dense, therefore the pressure is dropping. Assuming you are measuring boost at the inlet manifold, not on the outlet side of your boost control before the waste-gate actuator.

Sorry in ...

Hi I used a jaycar temp switch kit (need to build not to hard ) http://www.jaycar.com.au/productView.asp?ID=KC5376&CATID=&keywords=temp&SPECIAL=&form=KEYWORD&ProdCodeOnly=&Keyword1=&Keyword2=&pageNumber=&priceMin=&priceMax=&SUBCATID= with digital readout I have the liquid to air barrel removed at ...

I will disagree on these facts your turbo man has said. Does he have dyno figures/ proof they are too small, or is he just going off what the horsepower rating is.


A 300hp, 200kw 1hdt is possible. If its at the tyres it had better be in 2wd only. It will be smokey down low. It took alot for us to ...

I'm using a precision turbo: http://www.precisionturbo.net/small-frame-turbochargers.php

The 3231 with .63 A/R journal bearing oil lube - no water cooling. It has lotsa power, starts boosting at 1600rpm and has power up past 3000, I am running an air/air intercooler and 15 pounds boost. Will be ...

Have upgrading plans for my 4.2 turbo diesel and wonder if the stock turbo is any good, thinking of around the 300hp mark :? Am going to get an 3" exhaust all the way, FMIC, custom intake, if the stock turbo is out of the question, am going for maybe a GT2871R.86AR or a GT30.

Have the GT2871 on my ...

New to this forum I have a set of denco inlet pipes as I bought a PWR cooler only to find, that if you go by the PWR flow specs on the biggest that will fit under the bonnet (same size that denco use) you will find that your engine will choke up after 3000RPM EGT,s will sky rocket boost at manifold ...

I have an air/air intercooler now running 15 psi and 36 inch tires, I'm going to try the PWR barrel type to see how it works. I also plan on porting and polishing the head while I'm at it. I'll report back when it's done.
Can you post the differential across the liquid / air cooler @ 4000 or ...

I'm not sure i understand the way manufacturers have rated their product.

Not sure how the cooling effect of the longer cooler would increase it's HP rating's unless they gave us a specific set of test conditions to go with the ratings.

Also, isn't 1 cubic foot of air at 0psi (gauge) the same ...

I just wonder how the comp guys are pushing 20 PSI with the 1HZ turbo with denco barrel type intercoolers if they are all choked up - they are reving over 4000 rpm I am sure.
Is that 20psi at the turbo compressor outlet or the intake manifold after the cooler?
If at turbo then the differential ...

dow50r wrote:

MR Duck wrote:Please feel free to correct me on any of my calculations / theory’s I am by no means any sort of expert!!

One atmosphere is equal to 14.7 psi or so....not two...so the crm is halved to 240...

Sorry should have said 14.7 gauge pressure

Hi dogbreath,
If we work on 14.7 psi then this is equal to 2 atmospheres there fore effectively doubling the air flow through the engine assuming 100% efficiency so a…. 4Litre 4stroke equates to 2Litres per revolution x 4000 as you have already pointed out, at 2 atmospheres x efficiency (say .85 as ...

In my experiance yes,...... if you check out the PWR web site (they supply denco with liquid to air coolers) and calculate the air flow required at 14 psi for a 4.2 Litre 4 stroke engine at 4000 rpm you should find that the rated CFM of that cooler equates to the above engine at about 3000 rpm
tried ...

New to this forum I have a set of denco inlet pipes as I bought a PWR cooler only to find, that if you go by the PWR flow specs on the biggest that will fit under the bonnet (same size that denco use) you will find that your engine will choke up after 3000RPM EGT,s will sky rocket boost at manifold ...