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Discussion Starter #1
Hi, everybody.
In a recent trip through a highway I noticed that at 120 km per hour (75 miles/hour) the tachometer indicated 4,000 rpm, which I consider, from my driver's experience, a little high. Is this relationship OK for a normal engine with 67,000 kilometres since new?
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2004 Alfa Romeo 156 1.8TS
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The relationship is fixed to the gear ratio, so it sounds about right for a TwinSpark - though I'd say it's a bit high for 1.8/2.0's. I don't know the gear ratios for the 1.6, but I'd assume it's similar.
 

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Discussion Starter #3
The relationship is fixed to the gear ratio, so it sounds about right for a TwinSpark - though I'd say it's a bit high for 1.8/2.0's. I don't know the gear ratios for the 1.6, but I'd assume it's similar.
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That's about right for a 1.6, 80mph was about 4k rpm
 

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Depending on tyre size, (and pressure etc), the 2.0TS 156 should provide 20.9mph per 1000rpm so your 4000mph should see it travelling at 83.6mph. You could have a lazy speedometer. Give it the beans to around 6800rpm and you should see around 34mph in first, 57 in second and something like 88 in 3rd (from memory). Perhaps looking at GPS calculated speed may be easier.

147s run a shorter final drive ratio than 156s.
 

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Discussion Starter #7
Depending on tyre size, (and pressure etc), the 2.0TS 156 should provide 20.9mph per 1000rpm so your 4000mph should see it travelling at 83.6mph. You could have a lazy speedometer. Give it the beans to around 6800rpm and you should see around 34mph in first, 57 in second and something like 88 in 3rd (from memory). Perhaps looking at GPS calculated speed may be easier.

147s run a shorter final drive ratio than 156s.
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More than you wanted to know about gear ratios.
 
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