Extractors for 80

I had a set of "Hurricane" extractors and 2 1/2" mandrel bent system fitted to my 80 series 1HZ motor. It made a very definite improvement all over, I estimate about a 15% improvement. And there was no loss of bottom end power, the power gain was very linear.

The only downside was an increase in engine vibration at idle. I believe this was due to the decreased backpressure of the free flowing exhaust. If i turned on the airconditioner, it supplied enough load to stop the increased vibration. No real drama, just an observation.

Initially I had a reasonator and a "sports" muffler, but I found it too loud for my liking. I then changed the muffler back to a (new) standard one and this was much better soundwise. No louder than standard, but a nicer deep note to it. I was told I would lose most of the power gain by fitting the standard muffler, but this was simply not true. There was no loss in power with the standard muffler.

As for fuel economy, i didn't find any change with the new system, but I did drive a bit quicker of the mark, the 1HZ was no longer a big slug. However, I averaged 12l/100km before and after the change, nothing like the 20/100 you report. My driving is mostly the daily freeway grind, but would only change to 13.5l/100kms if driven in stop start city driving. Also, when towing a 1.6T offroad van, I average 17.5l/100kms. i suspect something very wrong with your injectors/pump to get that sort of economy.

The best thing about the system was the price, $650 for extractors (5 year warranty) AND mandrel bent exhaust including flexible vibration coupling thingy. Could not find cheaper than ~$1000 anywhere originally, so jumped at the price when quoted. Was expecting some shortcuts, but very good job by Ian Diffen in Canning Vale (about 18 months ago now).

Cheers

Mark

Search the archives, you will see the majority of people think they are a waste of cash...

YMMV

Jack66,

Yours must be a petrol like mine. 20L/100kms is pretty much standard. You'll find in general - going by other 80 owners on this forum- the economy ranges from absolute lowest 17L up to 22L per 100km.
I have a roofrack and an extra tonne of gear so I take it pretty easy on the highway.
Generally I suck up to 22L/100km at 110km/h down to 19L/100km at 90-95km/h.

If you have the same (1FZ-FE) you would have to expect this being a 4.5L so don't worry, you're pretty much level with the rest of the 80s.

I went to put extractors on but my mechanic said that it was more a waste of money. You better off replacing the entire exhaust system if extractors are put on and that is $$$, maybe nearly 1000 and take's years to justify the savings on the fuel bill.
I put a Lukey turbo muffler on and a snorkel. ARB boasts the snorkel cut's fuel costs but I've yet to see a significant difference. Muffler sounds good though.

Regards
ChrisNice southerly coastal fishing trip someday.
Chris

Jack
20 is wofull, get the motor tuned (or those injecters looked at) before looking at changing anything. Extractors are good, but for the return on $$ spent, a turbo is better value all round.
Andrewwheredayathinkwer mike?

20 ltrs/100 km from a diesel is very crook (unless you're driving flat to the floor all the time). Exhaust has nothing to do with that - most likely injectors.

If your in Melb shoot me an email & I'll refer you to a quality shop (did a good job of adjusting mine atleast).

I can see two things (possibly combined) - off-tune motor & heavy foot.

If you are running an auto under load (towing or just loaded all the time) you can expect to use more than a manual - up to 20%more

A bigger exhaust sys will assist, specially of you decide to add a turbo llater.

prado_95 @ yahoo.com