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LQ9 in a 5300lb vehicle. Which upgrades?

 
Old 01-09-2019, 04:42 PM
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Default LQ9 in a 5300lb vehicle. Which upgrades?

Hi all, I've got an LQ9 in a Landrover Discovery. It's running a manual gearbox. It weighs just shy of 5300lb. I use it off-road and I tow heavy trailers. It's unlikely to see a drag strip.. more than once or twice, anyway..
I don't like that the engine seems to run out of enthusiasm at about 5000rpm and it also doesn't seem to have the shove I'd expect of a 6 litre V8.

What upgrades would people recommend, from mild to wild?
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Old 01-09-2019, 04:44 PM
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longtube headers, TBSS intake and tell me about tire size and gears for a cam
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Old 01-09-2019, 04:45 PM
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also a proper tune. stock tunes almost always have too little timing and fuel
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Old 01-09-2019, 04:45 PM
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Anything you can do to free up the intake and exhaust, plus a drop-in truck cam from either Cam Motion, TSP, or Brian Tooley. You don't want anything that will lose much low end power.
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Old 01-09-2019, 04:53 PM
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It's running 285/75/16 tyres with 3.54:1 diffs the gears are
Transfer
High 1.22:1
Low 3.32:1

1st 3.23:1
2nd 2.13:1
3rd 1.39:1
4th 1:1

Long tube headers aren't really an option as space is tight between the chassis rails. I've got Hooker block hugger headers that *just* fit...
5th 0.73:1
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Old 01-09-2019, 07:20 PM
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Originally Posted by Sidewaysste View Post
It's running 285/75/16 tyres with 3.54:1 diffs the gears are
Transfer
High 1.22:1
Low 3.32:1

1st 3.23:1
2nd 2.13:1
3rd 1.39:1
4th 1:1

Long tube headers aren't really an option as space is tight between the chassis rails. I've got Hooker block hugger headers that *just* fit...
5th 0.73:1
What does the rest of the exhaust consist of? Id go for an intake, the above mentioned stage1 truck cams, and throw some 3.90ish gears in it, if you can get them for those axles. Very cool ride sir!
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Old 01-10-2019, 12:07 AM
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What octane of fuel do you use?
A bit of potential in the tune if you use 91 octane or higher, otherwise you will be very limited in the ignition timing adjustments that can be made with a heavy vehicle.
I had a 3230 lb car go 12.20 in the 1/4 mile with a fully stock lq4 (minus airbox), down to the stock exhaust manifolds. It wasn't even a thorough tune, it was a quick generic email tune way before I learned to tune. All that was changed was timing and torque management, fueling/power enrichment was left rich (stock). Just an idea in case high octane is available and not an issue to use all the time.

Otherwise a cam swap would be a huge gain even with stock exhaust, obviously you'd be leaving some power on the table but it sounds like a non-issue based on your limited space for exhaust.
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Old 01-10-2019, 06:32 AM
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Originally Posted by Sidewaysste View Post
It's running 285/75/16 tyres with 3.54:1 diffs the gears are
Transfer
High 1.22:1
Low 3.32:1

1st 3.23:1
2nd 2.13:1
3rd 1.39:1
4th 1:1

Long tube headers aren't really an option as space is tight between the chassis rails. I've got Hooker block hugger headers that *just* fit...
5th 0.73:1
I would do something in the 4.56 (or higher numerically) gear range if thats the size tire your wanting to stay with
that first gear is pretty tall for a heavy 4x4 manual transmission

Im also wondering what octane you run
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Old 01-10-2019, 07:15 AM
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I've got another transfer box that has a 1.41:1 High range gearset that I will be fitting when I have the time.

In the UK our base fuel is 95RON and the Super is 97 or 99. I seem to remember that it's not directly comparable - I think our 95 is equivalent to your 91 and our 97 to your 93.

I've been running this engine on 95 although I ran my old RV8 twinturbo on 99
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Old 01-10-2019, 07:17 AM
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I've found this nifty gear ratio calculator

https://www.ashcroft-transmissions.c...atio_calc.html
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Old 01-10-2019, 12:01 PM
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wow I didnt even pay attention to the High range being under driven
looks like that makes your 3.54 gears similar to 4.10's
and if you change to the 1.41 that will make them seem like 4.88's

not exact but close, with that being said I figure that thing should be fairly powerful.

Last edited by Ls7colorado; 01-10-2019 at 12:34 PM.
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Old 01-10-2019, 12:33 PM
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It's not slow for a 2.4 tonne vehicle, that's for sure and it's miles better than with the old RV8... It's just I'm used to an e39 M5 and a 300bhp MX-5
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Old 01-10-2019, 12:38 PM
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You would need some major improvements to keep up with either one of those, is there room for a turbo?
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Old 01-10-2019, 12:41 PM
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Originally Posted by Che70velle View Post


What does the rest of the exhaust consist of? Id go for an intake, the above mentioned stage1 truck cams, and throw some 3.90ish gears in it, if you can get them for those axles. Very cool ride sir!
The rest of the exhaust is the remains of the system from when it was a twin turbo RV8 which is 2" with no real bends to speak of and a glasspack straight through silencer each side. There is no balance pipe between the two banks, they are completely seperate. It's too small bore and too loud but will have to do until I can get to an exhaust builder. Suggestions are welcome.

Also, thanks!
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Old 01-10-2019, 12:48 PM
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Opening the exhaust system to 2-1/2" will see gains in power you can feel.
Putting an H- or X-pipe in there will smooth the sound and gain a bit more power.
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Old 01-10-2019, 02:31 PM
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Originally Posted by Sidewaysste View Post
I've got another transfer box that has a 1.41:1 High range gearset that I will be fitting when I have the time.

In the UK our base fuel is 95RON and the Super is 97 or 99. I seem to remember that it's not directly comparable - I think our 95 is equivalent to your 91 and our 97 to your 93.

I've been running this engine on 95 although I ran my old RV8 twinturbo on 99
91 or 93 equivalents are very decent, I'm assuming you haven't had a tune done on that ecu yet, you will be able to get some decent gains as factory is quite mild in spots.
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Old 01-11-2019, 05:17 PM
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Cam, tune, intake, exhaust. My 5.3 moves my truck along, tows a 22' tritoon just fine. You might verify its a lq9, i've seen a few end up being lq4, that would matter on the tune.
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Old 01-11-2019, 05:29 PM
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Shouldn't be running out of breathe at 5k. You may have another issue/issues. My lq4 in my 2500hd has no problem revving to 6k rpm even stock.
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Old 01-11-2019, 05:39 PM
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Get it to breathe

Tune it on 91 or 93 octane and those things will make a large difference.


After that, you'll throw tons of money trying to make it move out much faster if you stay NA so a screw type blower would be a good recommendation. Like a whipple or a LSA blower.
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Old 01-11-2019, 06:38 PM
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Guys, keep in mind he's running a dual 2" system. Yes, 2"! It's being choked. Or constipated.
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