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Free Flowing Exhausts for LandCruiser 100 Series Petrol (1FZ-FE)

Submitted: Tuesday, Feb 19, 2002 at 00:00

Peter Gordon

Hi, after talking to some "experts" I was wondering if anyone can clear up my question. Is a free flowing exhaust a worth while investment for the 1FZ-FE engine, ie does the benefits offset the cost in the short term or not and can it improve fuel economy? Any comments welcome. Thanks in advance.
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AnswerID: 2176   Submitted: Sunday, Feb 24, 2002 at 00:00

Nigel replied:

Hi, I can't help you specifically with advice on the 1FZ-FE but I found a 2.5 inch free flow exhaust to be worthwhile on my RB30 Nissan Petrol Engine. The biggest improvement came between 3500-4500 revs (ie when overtaking in 4th gear). I can stay in 5th gear down to 60 km/h now on flat or downhill roads so the economy is available if you drive economically. Conversely the extra power available at higher revs will use more fuel. It all comes down to your driving style, but in summary you should definately get more economy and/or power.
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AnswerID: 2177   Submitted: Sunday, Feb 24, 2002 at 00:00

Nigel replied:

I forgot to mention that I also have extractors fitted. The extractors came first which boosted power/economy and then the free flow system further boosted the power/economy.
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FollowupID: 773   Submitted: Sunday, Feb 24, 2002 at 00:00

Peter Gordon posted:

Thanks Nigel, I guess what I'm trying to find out is if I fit a free flowing exhaust (which I'm told will cost $1,000+) will I recoup that cost in fuel savings (fuel) over the next 2 years (about 80,000km)? Any opinions or feelings?
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AnswerID: 2182   Submitted: Sunday, Feb 24, 2002 at 00:00

Nigel replied:

I find that I can save up to a litre per 100kms with the extractors/free flow if I drive conservatively, although I do tend to use the extra power when needed which doesn't help the economy. My 2.5 inch system and extractors fitted was under the $1000 mark from memory.
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