Engine Noise @ 4000/rpm

Anyone else experience unbelievable harshness at 4,000 rpm (1.8 K series engine - 5 door Station Wagon).

On a long trip last week it was unbearable. But drop to 3,500/rpm or go up past 4,500/rpm and it eases off.

Any ideas how I can stop this booming NVH please?

And NO - I don't plan to just avoid running at 4,000 RPM

Hi, once again I'm sorry to say these vehicles are not meant to be driven at such speeds. The booming etc. is purely because the engine and transmission are at their limit, on the motorway 70/75 will cause no problems, 65/70 even better, for faster 4 wheel drive Suburu will cope much better.

Jerry - Thanks for your reply - I appreciate you taking the time to do so.

I disagree with your comments though. I worked at Land Rover when the Freelander was being developed and was the buyer for the exhaust, catalyst and exhaust Manifolds.

The car was always designed to cope with on-road and off road driving and went through extensive testing to ensure refinement was satisfactory at motorway speeds.

The harshness actually comes in at around 4,000 rpm. This means accelerating through the gears causes the same noise even at low speeds but high revs the situation still exists. The K series engine was developed as a fairly high revving engine - it application in the Freelander hardly changed its basic characteristics. On older Rover cars - you can still experience the same harshness @ 4,000rpm.

I have noticed that current Model Year Freelanders sound very refined. Therefore, there must have been some improvement work done on NVH.

I actually believe it is the exhaust manifold and exhaust back box to blame - and have my reasons based on my knowledge from buying them for the company those years past.

So........Maybe my question should be rephrased - Anyone know of a good Exhaust manifild for the 1.8k series - whuch fits the Freelander package - and a decent rear back box?

Or - perhaps, will the current Exh. manifold and Exhaust fit on older (1999) Freelanders?

Ta.

Right - well as i just posted elsewhere - we have just had to change the IRD unit (Often called - Front diff or transfer box) - the viscous coupling and support bearings, front O/S drive-shaft and a support bracket that mounts on to the engine and an engine vibration damper.

Guess what - the Engine boom has gone....

Well - all I can think is that the engine was having to work so hard to overcome all the resistance from the drive train that is was constantly labouring and made the noise....not just in protest.....but also because of the strain. Must have been like constantly towing a big trailer for the old motor and causing resonance to build up in the peak power/torque band.

So, - if you have such a "booming" noise.....be afraid- be very afraid....

It could just be a big bill on the horizon.

Or maybe not.........good luck if you have noise anyway..

Try not reving up to 4000rpm in each gear as in one of your previous posts. The Freelander may have been developed with refinement in mind, but it still isn't a "car" and should be driven with this in mind. As I said before if you want something to rev the guts out of buy a sports car.

Drive my Hippo like a car, sits at 90mph no problem and she laps it up. I reckon she could do 120+mph if the wife ever let me

Jerry said:

Try not reving up to 4000rpm in each gear as in one of your previous posts. The Freelander may have been developed with refinement in mind, but it still isn't a "car" and should be driven with this in mind. As I said before if you want something to rev the guts out of buy a sports car.

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I have a sports car too - and know the difference.
In your comments - You exaggerate and oversimplify - you add no more than you have before.
You obviously do not use your engine in the same way others do. Your comments seem to indicate that you believe anyone who does not adhere to your delivered wisdom is out of kilter with the real world which, you in turn believe you represent. Furthermore, that you understand, better that most others, the design envelope of a vehicle which I guess you had little development contribution on.

Chanting "Four legs good....two legs bad...." springs to mind.

4000 rpm is just at the point where the engine delivers a good level of torque - a good cruising point. On the motorway this is good for about 70MPH (80MPH indicated). The problem some of us have experienced is nothing to do with speed its about deterioration in refinement and root cause.

I am simply pointing out that the problem has improved since I had the work done on the drive-train. This could be the root cause - and I hoped some useful information to others.

You are simply bleating....

well that told you jerry you bleater

Firstly I don't bleat, just state facts. Have you in all your so called wisdom ever stopped to think why the drive train was in that condition in the first place? Driving as you suggest springs to mind. Having now reached the age of 60 and been driving land rovers of all types, including years in the army in desert and tropical conditions, I think experience counts for my comments. I also was not talking about speed, just the thrashing of the engine at max revs in each gear, change gear a little earlier you will still get to 70, what does a couple of seconds difference mean? not so many big bills possibly.
Any way here's hoping you repaired drive train holds up, and don't be so tetchy about being offered advice.

Yella disco man, do you think foul language is a good thing for kids to be coming out with? IF NOT.....DO SOMETHING ABOUT IT!!!

why have you posted that comment on this thread jerry, are you a complete ****wit? first of all you ask for me to be banned then you bleat on about driving a freelander too fast(AGB'S words, not mine) and now you are having a pop at me about kids swearing. personally i think you are a self riteous old ****er with **** all better to do but moan about the youth of today.

if you don't like it then **** OFF

you were a great loss to the diplomatic service.
sarajevo and kabul were never the same when you left.

why thank you ormus, i take your ironic compliments to heed

Freelander model: 5 door GS Station Wagon.
Engine type: 2.5 litre V6 petrol.
Gearbox: Automatic with steptronic.
Engine speed: 4000 RPM in top gear.
Road speed: 95 mph.

Only noise I get is the wind noise which isn't too bad considering the engine is pulling a house brick through the air.

This is exactly what I've been trying to get through to some of the numbskulls on this forum. There is somewhat of a difference between a 1.8 litre and 2.5 V6 yours as you state is not bad as it's dragging a housebrick through the air, but think what the poor guy with the 1.8 is doing to his motor in attempting to do the same with the same shape housebrick.

Most important thing of all is stopping that housebrick when you've wound it up to flat out.

I posted my comments to you on this thread as it doesn't matter where you look on this site your ludicrous infantile burbling is everywhere. I see your use of the English language is still degenerating, but you seem to get a high when some of users offer support.
I have a good friend who works with the mental health unit locally, and his recommendation is you seek professional help and counselling ASAP.

Jerry said:

I have a good friend who works with the mental health unit

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is he your carer by any chance

Much better, you didn't even swear.

thank you gerald, thats the first time you have ever said anything nice to me

Well that's 3 replies you've made with no cussin, now all you have to work on is spelling my name correctly, and we can all be on the same side.