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Post by draganlada on Jul 27, 2005 21:13:56 GMT 11
Richie try J C Diesels at Narelan (specialised in 4x4) ,
Westend diesels at Wetherill Park (specialised in pumps and injectors)
Both places are dyno tuning diesels
Dragan
PS.Where about in Sydney are you living, Richie ?
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richie
Isuzu Junior
Posts: 112
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Post by richie on Jul 28, 2005 18:01:43 GMT 11
i live in smithfield, how about yourself?
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Post by draganlada on Jul 28, 2005 20:18:13 GMT 11
I.m at Canley Vale ,my neighbour !
Richie will you like to meet somewhere ?
This saturday me and my frontera mate ( most probabily ) are going to Stockton beach and will meet Yarno,another club member.
Dragan
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richie
Isuzu Junior
Posts: 112
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Post by richie on Aug 3, 2005 16:33:05 GMT 11
yeah mate I wouldnt mind meeting up sometime, I need some 4WD buddies, as most of my friends are still into their sportcars n "you know what"......
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Post by draganlada on Aug 10, 2005 0:08:24 GMT 11
Last weekend I instaled boost gauge ( $ 50 at autObarn ) and as Jimmy pointed out at idling speed of engine nidle oscilates up / down around zero ( can anyone give me reason WHY  ). Max boost is just above 10 psi ( mods on 4jb1 are blocked off EGR pipe and oil catch can ) and I keep hearing about max boost of rodeos 4jb1 should be 8 to 8.5 psi |
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Post by geeves on Aug 10, 2005 12:07:46 GMT 11
Mine shows 13 +psi To a degree more boost = more power. Think of the mods you have done that affect this ie after market filter,snorkle, big exhaust.
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Post by Jimmu on Aug 10, 2005 13:35:48 GMT 11
I figured the vibration was simply not enough pressure either way on the guage to give a reading. I would hazzard a guess it is measuring small pulses caused by the combustion cycle.
When I give her a little more revs, like to up to 750-1000 rpm it stabalizes at 0.
If your beast blows some black smoke under load (Unburnt diesel) then I think some extra boost would give you a bit more power. As mine does not blow much at all I don't believe it would. Not at least until there is more diesel to burn with the extra air. In testing to date there is no noticeable power increase between 10.5 and 14 psi at least.
I actually dropped the boost back to stock before we hit LCMP a couple of weeks back.
Jimmy.
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Post by Graham on Aug 10, 2005 23:37:51 GMT 11
I thought someone said that there was a line going to the fuel pump to increase fuel delivery with increased boost - so unless your fuel pump is maxing out or there is a blockage, I would expect simply increasing boost to still increase power.
Just throwing ideas around for discussion.
Graham.
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Post by Jimmu on Aug 11, 2005 13:36:51 GMT 11
If that is the case then yes I would imagine it would. But to date there has been no noticeable difference in power at different boost levels.
So the power gain would be less than even changing to a uni filter which was noticeable.
It would be nice to know the truth of this though.
Jimmy.
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Post by francesco on Aug 11, 2005 17:38:34 GMT 11
When I did the boost increase on my 2.8 there was a definate and very noticable power increase with mine. The dyno figures are somewhere in the forum.
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Post by Jimmu on Aug 11, 2005 19:33:51 GMT 11
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Post by mulover on Aug 13, 2005 17:38:10 GMT 11
An easy way to adjust the boost pressure on a 2.8 4bjit is to put a tee joint into the line from the outlet side of the turbo to the waste gate, with a restricter on the inlet side ( something with about a 1mm hole in it) and then have this connected to a tap to turn the flow up or down, no flow = factory boost (about 11psi on my truck) with the highest ive had being 22psi, but i have got mine tuned so that it only goes upto 16psi, and i screwed that wee screw on the back of the fuel pump up a little, this give a nice gain in power. I would be very interested in hearing about the dyno tuning you guys have done.
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Post by Benzev on Aug 19, 2005 21:07:28 GMT 11
If you want economy, smooth running and extra power from your diesel don't touch your turbo! You'll only end up wearing it out faster and blowing your oilseals in the process! Increase the springtension in your injectors which will improve performance and economy at th same time and your engine will run noticeably smoother all through the rev range! Simple cheap and efficient solution!!! If you still want more power get bigger injectors but this will affect your economy of course!!!
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Post by maletimaru on Aug 20, 2005 19:20:21 GMT 11
Can someone please post a pic of this 'screw' on the fuel pump please!!!!
Thanks guys so i know where it is and in what direction to turn it!
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Post by Jimmu on Aug 21, 2005 19:37:00 GMT 11
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Post by mulover on Aug 27, 2005 21:45:25 GMT 11
The "screw in question is on the firewall side of the fuel pump sort of on the back underneath everything, easyest way i have found is to remove the tire. It will be under a alloy cap unless someone has been in there already. It has a lock nut on it and a slot in the top of it for a screw driver. DO NOT FIDDLE WITH IT ANY MORE THAN A QUARTER TURN AT A TIME AND KEEP TRACK OF HOW MUCH YOU TURN IT!!!!!! too much and you'll stuff everything up!! From memory in =more fuel, out = less, but i could be wrong. As for the boost, using a gtec meter i recorded 95 hp at factory (11psi) boost, and 105 hp at 16 psi boost. but thats just me.
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Post by maletimaru on Aug 29, 2005 21:03:02 GMT 11
I have fitted a boost gauge and only have around 8 - 10 psi maximum!!! so i will definately be giving the fuel pump screw a tweak!
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). Max boost is just above 10 psi ( mods on 4jb1 are blocked off EGR pipe and oil catch can ) and I keep hearing about max boost of rodeos 4jb1 should be 8 to 8.5 psi
