Hi all,

Just looking around on the forum and couldnt really see much on this topic but was wondering if anyone has had their 4.4 v8 petrol rrs remapped/tuning box? mines on an 06 plate.
Would like to know how much it improved both on power and mpg.

Thanks

Below the threshold of actual relevance. Regards etc.,

Wojtek

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WAS: 2006 RRS Supercharged
IS: 2010 RRS TDV8 HSE

There were so few Petrol 4.4V8's sold in the UK/Europe that unfortunately it is the one variant that there is very little info about on the forum. Buyers prefered the better performance of the S/C and they have similar fuel consumption of the NA 4.4 V8. 2020 Pangea Green 1st Edition D240 New Defender 110 is here and loving it
2018 Melting Silver Mini Countryman PHEV - soon to be replaced
2015MY Corris Grey SDv6 HSE Dynamic, the best car I have ever owned, totally reliable only a cou0le of rattles in 3 years, now no longer in my care
Also in my garage is a 1996 TDi300 Defender 90 County HT made into a fake CSW

Oh really? would it be relevant asking about the remaps people have had on their 4.2 SC then? or is it totally irrelevant?

"Relevance" as in "noticeability".
It's way different in a forced induction engine. Especially when you couple it with a boost increase.
Not much you can do in an N/A. Trust me, I have a RRS SC and a Disco3 4.4, done my homework on numerous cars I had, N/A, supercharged, turbocharged, you name it.
If you want to squeeze more HP out of an N/A engine, you start with a head port/polish, calculated and port-matched exhaust manifolds, ram-air intakes, aggressive camshafts, high-compression pistons, lightened crank and flywheel, sport catalysts and only then you finish it off with a remap. Costs thousands (my 4-cylinder, 2-liter BMW racing engine was in excess of 7000 pounds despite being 'prepared' by BMW Motorsport in Munich and it had a 3000 rpm usable powerband somewhere between 4000 and 7000 rpm). Yes, it had over 220 hp compared to Motorsports' 170, 20 hp up stock 150. No, it was not a road going vehicle, only a dedicated track car.
With forced induction (as in an SC) it's way easier to squeeze more HP. Much more space left by the design of the engine and the principles behind it. Adjust the fueling to be a bit leaner, advance the timing, bang, you have 20 hp more in an instant. Couple it with a smaller compressor pulley and the gains turn to 50. My supercharged Mini Cooper S R53 - stock 158 hp, with the 17% smaller compressor pulley it went to 175 hp, a remap and 212 hp were on the table. Total cost - around 250 pounds. My turbocharged Lancer Evo 6 was using only a remap to jump from 290 to 360 hp. Same money, more or less. But it had something to boost the amount of air going into the engine, something that just isn't there in an N/A car.
So the short answer is no. No, you won't see any noticeable (or relevant to everyday driving) profits out of remapping a 4.4 N/A. It is possible, no doubt about it. Maybe 7-10 HP peak gain? Equivalent to drive with your tank full or nearing empty. Not worth it, not at all. Regards etc.,

Wojtek

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WAS: 2006 RRS Supercharged
IS: 2010 RRS TDV8 HSE

Thanks Thewojtek for the advice and info, definitley sounds like you know your stuff! Looks like Ill have to scrap that idea then and move on.
Have you heard any 4.4 with an aftermarket exhaust on?

I don't know if you are aware that there were a handful (IIRC 8 in total) 4.4S/C's built by LR for development but the engine longevity was so short due to the thin cylinder walls that the bore was sleeved down and capacity reduced to 4.2 litres. Virtually all the development cars ended up in the great LR crusher but I know of one that is still locked up in a shed in Scotland....... You could try DMS and see if they do a remap for it, but remember to tell them that it is a 4.4 Petrol otherwise they will think you have the 4.4SDv8............. 2020 Pangea Green 1st Edition D240 New Defender 110 is here and loving it
2018 Melting Silver Mini Countryman PHEV - soon to be replaced
2015MY Corris Grey SDv6 HSE Dynamic, the best car I have ever owned, totally reliable only a cou0le of rattles in 3 years, now no longer in my care
Also in my garage is a 1996 TDi300 Defender 90 County HT made into a fake CSW

Mmarques wrote:

Have you heard any 4.4 with an aftermarket exhaust on?

More or less this:
What I like about the Disco3 is that is whisper silent compared to my SC (which has exactly this mod done). However, what I like about the SC (apart from the 100 HP improvement over the Disco) is that is loud as a thunder when I floor it.  Regards etc.,

Wojtek

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WAS: 2006 RRS Supercharged
IS: 2010 RRS TDV8 HSE

Loud as thunder when you floor it, Mmmmmm I like haha. Just watched the video, so could I just delete/cut out the turtle shaped muffler or would I also have to remove the rear silencers/mufflers?

The usual procedure on a RRS is to remove #7 on the exhaust system.



Removing rear silencers will produce a lot of higher-pitched noise on the motorway. You don't want that. Regards etc.,

Wojtek

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WAS: 2006 RRS Supercharged
IS: 2010 RRS TDV8 HSE

Just been reading on an US landy forum and they seemed to have removed/deleted #8? whats the difference in removing #7 or #8?
Do you know if this will affect the emissions when it comes to MOT time?

Removing a muffler does not affect emmisions tests, so you're safe with that.
The jury is still out in regards of the 7 vs 8. I did 7, as the vast majority of mods I've seen was to remove this part (it's a bit easier as well, I believe). But if you want to go for #8, just cut it ot and you can always have it welded back if you don't like it. Regards etc.,

Wojtek

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WAS: 2006 RRS Supercharged
IS: 2010 RRS TDV8 HSE

So are both 7 & 8 classed as mufflers? Im assuming having both removed would be too loud? How did you do yours, did you just cut it out and have a straight pipe (2 straight pipes) welded in? have you got a video of how yours sounds?

Yes, exactly. Two straight 2.25" pipes instead of the muffler (one is called "resonator". can't remember which one).
- since there is no load on the engine, it's a bit muted. Gets louder when you actually drive it, but I have no proper microphone setup to record it, the GoPro sucks in this area and the iPhone is just a bit too costly to glue it on the back of the speeding car... Regards etc.,

Wojtek

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WAS: 2006 RRS Supercharged
IS: 2010 RRS TDV8 HSE

Very tempted by this. Whats it like when your doing motorway driving, is it a drone or is it not that bad?
Ive seen that video whilst looking for others, didnt know it was you ill see if I can find a video of one with load on/driving away.
Did you just use stainless steel pipes?