Defender 1997 3.5 V8 Power Increase - Defender Source
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  #1  
Old May 15th, 2016, 06:30 AM
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Zaid Siwady
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Defender 1997 3.5 V8 Power Increase

Hello there,

I just bought a 1997 Defender 110 with a 3.5L V8 engine.

The car has a lot of torque but the maximum highway speed it's giving me is 105Km/h.

Any tips on how to give it more power to reach around 140Km/h without an engine swap?

The engine has been recently rebuilt and all the mechanical aspects of the car has been properly restored.

I read somewhere that replacing the camshaft with one from a 3.9L V8 engine could do the trick, any idea if this is enough to get what I want? (of course budget is an issue as I am currently broke :shock: )

I am also looking for ideas on how to somewhat reduce fuel consumption is it is giving me around 3km/L which i think is really bad.
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  #2  
Old May 15th, 2016, 06:38 AM
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Lots of variables besides engine- what Tcase ratio, axle ratio (stock??), what size tires, has intake/carb been converted to Edlebrock, etc??
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Old May 15th, 2016, 06:40 AM
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Quote:
Originally Posted by rovertrader View Post
Lots of variables besides engine- what Tcase ratio, axle ratio (stock??), what size tires, has intake/carb been converted to Edlebrock, etc??
As far as I know, everything in the car is stock. No modifications have been done to the car.

Also keep in mind I am not very mechanically inclined so bare with me
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Old May 15th, 2016, 07:24 AM
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No worries, just realize several factors will affect top speed. Is there a tach? Engine speed at say 100kph, and tire size will help diagnose potential issues/limitations.
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Old May 15th, 2016, 08:01 AM
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Of course we're all assuming the guy that rebuilt it actually knew what he was doing and dialed it in correctly.
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  #6  
Old May 15th, 2016, 08:31 AM
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There are a couple of books on performance upgrades- but my advice is to consider an engine swap- to an LS1 or LS3. The Rover 3.5 is not a powerful, efficient nor reliable engine. Upgrade it.
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Old May 15th, 2016, 09:29 AM
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If it only does 105, there is something seriously wrong. Top speed should be 140 to 150.

The fuel consumption is very high as well, double normal. You need someone to look at it and see what is wrong. This will not be repaired over the internet.
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Old May 15th, 2016, 11:17 AM
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Zaid Siwady
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Quote:
Originally Posted by rovertrader View Post
Lots of variables besides engine- what Tcase ratio, axle ratio (stock??), what size tires, has intake/carb been converted to Edlebrock, etc??
Quote:
Originally Posted by rovertrader View Post
No worries, just realize several factors will affect top speed. Is there a tach? Engine speed at say 100kph, and tire size will help diagnose potential issues/limitations.
Tyres are 235s and I just noticed that when I keep my foot all the way down on the paddle trying to reach a higher speed it reaches 107kmh and the whole car starts juddering.

I just need pointers on what to look for when I take it to the mechanic to make sure he only works on relevant things without charging me extra ... keeping in mind that I am really a newbie when it come to any mechanical topics.

Thanks

------ Follow up post added May 15th, 2016 07:19 PM ------

Quote:
Originally Posted by Rocky View Post
Of course we're all assuming the guy that rebuilt it actually knew what he was doing and dialed it in correctly.

The garage is known to be the Land Rover expert here but as you said ... we never know.

------ Follow up post added May 15th, 2016 07:20 PM ------

Quote:
Originally Posted by Paul K View Post
There are a couple of books on performance upgrades- but my advice is to consider an engine swap- to an LS1 or LS3. The Rover 3.5 is not a powerful, efficient nor reliable engine. Upgrade it.

Engine swap is not an option for me as I want to eventually ship it to the states and it is required to be all stock. plus I can't afford it right now.

Looking for the best way to enhance performance with the current engine if possible.

------ Follow up post added May 15th, 2016 07:23 PM ------

Quote:
Originally Posted by Red90 View Post
If it only does 105, there is something seriously wrong. Top speed should be 140 to 150.

The fuel consumption is very high as well, double normal. You need someone to look at it and see what is wrong. This will not be repaired over the internet.
I am taking it to my mechanic after tomorrow and travelling for a few days, I just need some pointers so he would think that I now what I'm talking about and ensure he doesn's come up with random s#$t and make me pay more than I should
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