extractors for 1hz

Submitted: Sunday, Mar 18, 2012 at 15:13

ThreadID: 92609 Views:7874 Replies:7 FollowUps:3

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Tazzee

Hi i need to replace the exhaust system on my 1HZ 1995 hzj75 troopie, i would like to do the turbo conversion but in a cash shortage at the moment so was looking at a set of extractors and a bigger exhaust system would this help me with any power or fuel improvements or would i be better or staying with a standard system ?
until i can afford a turbo conversion.

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Reply By: Member - Jason B (NSW) - Sunday, Mar 18, 2012 at 16:22

Reply By: Member - Doug T (NT) - Sunday, Mar 18, 2012 at 16:35

Reply By: Member - Jack - Sunday, Mar 18, 2012 at 17:19

Reply By: pop2jocem - Sunday, Mar 18, 2012 at 21:00

Sunday, Mar 18, 2012 at 21:00

Tazzee,

Not sure if you are just looking for a bit more hill climbing ability or for towing but from the research I did before transplanting a 1HD-FT into my old HZJ75 it would appear that most people that turbo the 1HZ run into problems when they wind the fuel screw up too far and then hang a caravan on the tow bar. The exhaust temperatures climb to dangerous levels and prolonged usage basically cooks the poor old motor. I have just completed my transplant and am about to find out if the cost was worth it. Power wise very good, reliability yet to find out.
A mate of mine had a Troopy many years ago and wanted to tow a good sized van around the block and had mods done which from memory consisted of a cam grind, extractors and a slight tickle of the max fuel screw. Not sure if anything else was done, toooo long ago...lol.The performance gained was certainly noticable but of course nothing like a full turbo conversion. Also too long ago to remember the cost details but was a lot cheaper than the turbo option. Did the lap around Oz with no dramas.

Cheers
Pop

AnswerID: 480741

Follow Up By: Tazzee - Sunday, Mar 18, 2012 at 22:36

Sunday, Mar 18, 2012 at 22:36

Long term i am looking at an off rd caravan but at the moment i have a camp trailer on the highway its a bit of a slug so it would be worse with a van in tow,but i don't mind going slow.

But i need to replace the exhaust soon so i was trying to decide whether to replace it with standard or bigger diameter and extractors. Reading other posts about the turbos is starting to be a bit of a worry in long term reliability as we plan on travelling a lot more in the years to come and i dont want to get stuck with a dead motor just to get there a bit quicker. It would be nice to buy newer Troopie but i am old school don't like all the electronics that are on them today.
Cheers.

FollowupID: 756192

Follow Up By: Member - Jason B (NSW) - Monday, Mar 19, 2012 at 09:44

Monday, Mar 19, 2012 at 09:44

I am wading through all of the info about Turbo conversions for the 1HZ also, their are some real horror stories out there. But from what I have read most guys that have run into problems have been after large power gains.

From what I have researched as long as the boost levels are modest (9 PSI max in my mind -- a lot of kits run 11 psi +), you fit a free flowing exhaust, get the valve clearances done, and have the fueling set up on a dyno, their shouldn't be to many reliability problems if you don't flog the crap out of it.

The main issue seems to be Exhaust Gas Temps, and the majority of guys run an EGT guage and drive off it, backing off or changing down a gear when the temps start to climb.

DTS seems to be by far the most popular kit (and it looks to be good quality), however when I spoke to Macquarie 4x4, for the 1hz they recomended the Safari kit, as it was easier on the engine because it runs less boost. I confirmed this with MTQ who make the DTS kit, their kit runs more boost than the Safari kit. Macquarie indicated that they have very few issues with engines modified with the Safari kit.

They indicated people get adicted to the power increase of the standard kit and then chase a bit more because it's easy and cheap to do once the Turbo is fitted, but that is when reliablity starts to suffer due to over fueling etc.

The standard kit adds about 100nm to the 1hz, that will do me and I will live with this gain and not chase ultimate power. All I am looking for is one gear better and maybe sitting on 70kms in third towing the CT on up a long hill as opposed to 45 in second at the moment.

Lcool did a group buy recently where they got the Safari kits for about $2,200 because they bought so many at once. I will be looking at jumping in on the next one of these.

Regards

Jas