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Fuel consumption by Yannsky
Started on: 07-13-2015 10:10 PM
Replies: 7 (118 views)
Last post by: olejoedad on 07-14-2015 11:09 AM
Yannsky
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Report this Post07-13-2015 10:10 PM Click Here to See the Profile for YannskyClick Here to Email YannskySend a Private Message to YannskyEdit/Delete MessageReply w/QuoteDirect Link to This Post
Hi

I have 3.1 block and 2.8 head with fierostore performance exhaust manifold. My engine drink 10 L per 100 KM (sorry don't know gallon per mile) I don't push it over 115 km per hour. I heard that a fiero should use like 8 L per 100 km. No check engine code no bad idle. Hyperchip and 180 c thermostat.

Where should I look first to reduce the fuel consumption and get a regular 8 L per 100 km

Thks

Yannsky
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cmechmann
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Report this Post07-13-2015 10:48 PM Click Here to See the Profile for cmechmannClick Here to Email cmechmannSend a Private Message to cmechmannEdit/Delete MessageReply w/QuoteDirect Link to This Post
These would be things to check when the engine otherwise runs good.
Properly working fuel pressure regulator and engine coolant temperature sensor. On the fuel pressure regulator, there is a habit of cracked nylon vacuum lines causing lightly higher than normal cruise fuel pressure. On the coolant temp sensor. You need to watch it with a scanner while it is warming up and when it gets to normal temperature. It may not be out of range enough to cause a code but if it is off by 15 degrees and you are already running a cooler thermostat, the ECM may see that as a cold engine, fattening up the mixture.
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hiwil88formula
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Report this Post07-13-2015 11:39 PM Click Here to See the Profile for hiwil88formulaClick Here to Email hiwil88formulaSend a Private Message to hiwil88formulaEdit/Delete MessageReply w/QuoteDirect Link to This Post
Replace that hyperchip with a stock one. Hyperchip wastes fuel.
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cam-a-lot
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Report this Post07-13-2015 11:45 PM Click Here to See the Profile for cam-a-lotSend a Private Message to cam-a-lotEdit/Delete MessageReply w/QuoteDirect Link to This Post
Is your car auto or standard? With the auto, getting 10L/100 KM is pretty normal. Despite what people say, these are heavy cars, so you won't get great fuel economy, especially with an automatic.
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f85gtron
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Report this Post07-14-2015 12:21 AM Click Here to See the Profile for f85gtronSend a Private Message to f85gtronEdit/Delete MessageReply w/QuoteDirect Link to This Post
If it's a manual, it depends on whether you have the 4speed or 5speed. The 5speed delivers better fuel economy. Also, which four speed. The my17 Muncie had basically racing gears and runs high rpms at hwy speeds. The other "economy" 4speed manual had taller final gears and was better for fuel economy.
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Yannsky
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Report this Post07-14-2015 06:25 AM Click Here to See the Profile for YannskyClick Here to Email YannskySend a Private Message to YannskyEdit/Delete MessageReply w/QuoteDirect Link to This Post
Sorry it's a Getrag 5 speeds

Yannsky
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dobey
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Report this Post07-14-2015 09:48 AM Click Here to See the Profile for dobeySend a Private Message to dobeyEdit/Delete MessageReply w/QuoteDirect Link to This Post
9l/100km is closer to what you'll get with mostly highway driving. You might be able to squeeze 8l/100km out of it if you drive 100% highway miles at around 100km/h.

Also those numbers are for a stock fiero. With a 3.1, hyperchip, and 180 degree thermostat, you can expect to use more fuel, not less. So 10l/100km seems just about right.
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olejoedad
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Report this Post07-14-2015 11:09 AM Click Here to See the Profile for olejoedadClick Here to Email olejoedadSend a Private Message to olejoedadEdit/Delete MessageReply w/QuoteDirect Link to This Post
Dump the chip and replace it with stock, return to a 195° thermostat.
Your mileage will improve and performance will be the same.
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