Extractors

Dave,
Extractors do work but you must also fit a free flow muffler.

You will get improvement but the biggest problem is the 105 weighs in pretty heavy

I fitted some HM extractors to our HZJ105 and it did make a differance to allowing the engine to breath better.I never had a problem with slipping belts but as soon as I had the extractors on and gave the old girl a rev, the alt belts squelled under revs.Climbing steep hills was still a pain but engine recovered quicker over the top.
I then added a 2 1/2 mandrel exhaust and to be honest, noticed no differance.
Thne I got a DTS I/C turbo, whoooo.Now it GOES.
BTW, my HM extractors are on ebay ATM for $150(cost $500) so that would be a cheap way to find out.Item no.250342307460

David, I fitted extractors to my 2.8D 4Runner in September. Noticed the difference straight away. Better acceleration and more mid range power I think. Then, after a trip and breaking my exhaust, I fitted a 2 1/4" sports muffler and had a new system installed. Now it's a totally different car. More power right thru the range, quicker acceleration, revs higher. cost was $140 for extractors off ebay, $200 to fit, $25 for muffler (left over from a project car), $200 for rest of exhaust system. So for $565 I thing it was money well spent. A turbo would have cost a lot more to buy and fit so i say for me the extractors were probaably better bang for my buck. I drove a 2.8TD Hilux & it doesn't go much better than mine does now.

Check the claims of "mandrel bent " exhaust over a "normal" larger exhaust. You might find you are spending extra $$$ for nothing. There's a lot of jargon around that sucks people in. If you minimise and smooth out the your bends you will probably get as good results. General engineering physics apply.

I know you don't want to fit a turbo but if you want results worth mentioning then reconsider. We fitted one to our 1HZ and the difference is staggering especially if you fit a 2.5" system behind it.
If it is cost stopping you then do nothing till you save up a bit more $$$. Extractors are just fiddling around the edges if you want a 1HZ to perform. Pity you are in WA or you could have compared your 105 to our 80 series. Good luck with your decision.

Hi David,

I fitted extractors to my 80 with the 1HZ but retained the original exhaust & muffler.

There was a detectable increase in noise in the cabin but the only performance increase I could detect was that it became less breathless over 3,000RPM.

As I rarely push it to 3,000 it proved to be of no benefit to me.

Peter

Hi David,
I have Genie extractors and a Beaudesert Exhaust 2.5 inch mandrel stainless steel exhaust, lucky enough to pick up the lot second hand at the right price. The performance increase was noticable to me, and apparently you need to have an increase of about 10% before you notice any change. The big issue with the 105's is the pinched up pipe where it goes over the rear axle on the standard system. The trick is to open up this piece by replacing it. Hope this helps.

Dave, I fitted them to my 2000 HZJ105R acouple of years ago, 2.5 inch pipe, mandrel bends with full flow muffler. Noticed a difference straight away with acceleration and pick up, it breaths alot better and revs out to about 3200 rpm quite easily. havn't notice much differnece in the fuel economy, still getting around 1000 ks out of the 2 tanks.

Bernie

David,

I fitted extractors and a thru-flo muffler to my 2000 model 1 hz troopie. 80,000 kays, I had the work done by a reputable compamy not the hot rod types. The fitters asked what I wanted from them....was it power increase or fuel comsumption reduction I of course said i want both with a smile, but power was the main issue. Job done and I must say that it was like picking up an extra gear ...For example If I could drive up a hill in fourth gear at say 60 kays well with the new extractors I could go over the same hill at 70 in fifth gear!! I was more than happy and my fuel went from 15lt per 100 km to 12 lt per 100km. Now my truck is well loaded all the time at about 2900kg. MONEY WELL SPENT... Oh the cost in 2005 was $700. I'm not a big fan of turbos on non turbo engines just look at a workshop manual and compare the engine specs of both engine types, you will see they are not the same. Then ask yourself why, car makers dont change specs for nothing its too costly. Example. look at the compression Ratio of the 1hz turbo its 18:1 non turbo is 22:1


regards jeff

Many thanks for the replies. You all verify what I already knew or thought.

The comment that the 105 Series is a heavy beast I believe is part of the issue. My mate has a 2000 Troopy 1HZ and it pulls and drives harder than our 105, I think this is to do with weight and gearing, plus we run 285/75 tyres, which doesn't help power.

A dyno test on ours shows full power is developed.

Turbos certainly smarten motors up, my experience with after market turbos on tractors back in the 1970s certainly proved that for me, plus a turbo Rodeo and Hilux TD have also demonstrated this for me, but despite good reports with turbos on 1HZs, there are many problems also, just read any forum threads and those issues of turbo charging a motor not specifically built for it appear more than regularly. We bought the 105 1HZ to do a job with reliability being the foremost issue because we get a long way from home in very remote places, and a vehicle without sensors and computers is very comfortable for us old fella's, plus the beam axle up front, we are happy.

This is a 10 year project for us, that is we hope to be touring a lot in the next 10 years so longevity is also important for us. Turbos certainly reduce engine life in almost all cases from experience, we are looking for 400,000kms from this car by the time it is 18-20 years old.

But my thoughts of fitting a more free flowing exhaust set up to help things along a bit and get the hot gases away quicker and easier is what we think will be an advantage for as we tow a heavy camper in 4th gear a lot on the highway and the RPM is up around 3000 for extended periods, so a free flow setup should be an advantage in our case, without risking reliability.

Many thanks again for the replies.

Cheers
David