 | Home > V8 > Differential Pegging 700BHP |
 
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| John P Member Since: 26 Dec 2013 Location: West Sussex Posts: 319   
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I've just placed my order with Megasquirt. Give Nigel a ring to discuss. I have gone for lockers front and back with pegged front and back, with 300M halfshafts. 3.5 reverse cut pinion front and standard rear. HD flanges. Will get the transfer box done with 300M shafts etc. as done by Ashcroft.
https://www.megasquirt-v8.co.uk/diff_pegged.php |
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24th Apr 2024 5:01pm |
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| Porny Site Sponsor Member Since: 31 Aug 2009 Location: Sutton Coldfield - West Midlands Posts: 809 
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I'll be shocked if you get 700bhp from the 5.0 AJ133...
Did a lot of work on those back in the day (actually they all have some of the software I developed on the test beds for JLR in them) - and even in the cancelled GT3 spec with a very different supercharger, we were still at 650bhp and a big chunk of torque. A lot of companies try to overspeed the supercharger with smaller pulleys - but this only gives a small gain, and you quickly get to the point of diminishing returns as the supercharger heats up the compressed air quicker than charge coolers can get rid of the heat. Also surprised you managed to get the engine running stand alone, as not a lot of ECU's will support it. However, going back to the question... pegged, 100% yes. As above I've have a chat to Nige at Megasquirt/Xcess 4x4, or Tom ay Winchester Gears. As a minimum I'd go pegged ATB diffs, Ashcroft shafts/CV's,propshafts from Gywn Lewis and a Winchester Gears Stage 2 ATB LT230. At least through an Auto box everything else has a chance of hanging on.... Don't forget brakes and steering in the mix... 500bhp plus in a Defender is fun! but you need to control it. IRB The home of the first modified Keswick Green 90 - and the first 2.4 Puma through both the 200bhp and 550Nm barriers. www.IRBdevelopments.com www.facebook.com/irbdevelopments www.integrated316.com www.facebook.com/integrated316 |
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24th Apr 2024 5:23pm |
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| jst Member Since: 14 Jan 2008 Location: Taunton Posts: 8043 
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i would peg them yes.
for your suggested usage i wouldnt truss the axles. Cheers James 110 2012 XS Utility 130 2011 M57 bespoke Camper 90 2010 Hardtop 90 M57 1988 Hardtop |
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25th Apr 2024 12:13pm |
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| LJMARSDEN Member Since: 08 Jun 2021 Location: Nottingham Posts: 339 
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be sure to post as much as you can regarding AJ V8 please
 4.0 V8 Defender 90
My Instagram |
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25th Apr 2024 12:19pm |
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| BaronDefenders Member Since: 28 Jun 2019 Location: London/Cotswolds Posts: 896 
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As above, I’d go ahead and have them pegged.
I now go for pegged diffs whenever I’m sourcing replacements (from Winchester Gears), regardless of power output. Charlie 1949 Series 1 80 (SOLD) 2002 Td5 90 (SOLD) 2008 Freelander 2 (SOLD) 1958 Series 2 88 Pastel Green (2019 LR Legends Best Restored) 1983 V8 110 Limestone (Previously owned by Tom Sheppard MBE) 2004 Td5 90 Santorini Black (Td5INSIDE Powered & Rebuilt by CSK) 2012 Puma 110 Zermatt Silver (Overlanding Build) Instagram: @BaronDefenders |
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26th Apr 2024 6:34am |
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| MadTom Member Since: 10 Sep 2013 Location: Olomouc Posts: 623  
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Some years ago I have changed standard diff gear for HD from KAM with 1:3,8 ratio. They had twice uch of metal, so just the gears itself were much stronger.
With this much power, look for any possible upgrade. It is not good idea to have huge power, and be scared to use it, because of week gears somewhere. "Drobek" = The Small One - Discovery 2, "Blufínek" = The Blue Thing - Defender 130, and for me at least Ford Mondeo  |
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26th Apr 2024 8:28am |
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| sako243 Member Since: 08 Jul 2014 Location: Wales Posts: 1219  
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Out of curiosity why is that? Surely it's just a V8 petrol at the end of the day. Admittedly there's all the variable cam stuff so I guess if you're chasing performance or emissions that matters. Just my engineering curiosity as I'm currently building my own ECU for the vulnerable old Rover V8 which I know is lightyears away but coming from a background of systems operating at GHz frequencies and separately mega watt power systems nothing particularly phases me. Ed 82 Hotspur Sandringham 6x6 95 Defender 110 300Tdi |
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26th Apr 2024 9:05pm |
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| Grouse Member Since: 16 Apr 2012 Location: on the hill Posts: 521 |
How are you getting 700 horses out of the RR 5.0 Supercharged ? We’ve got one here in an SVR and that’s around 550 horses - so you’re managing to squeeze an extra 150 out of her - I’m really curious how this can be achieved and by whom ?
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26th Apr 2024 9:22pm |
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| Porny Site Sponsor Member Since: 31 Aug 2009 Location: Sutton Coldfield - West Midlands Posts: 809
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AJ133 has piezeo electric GDI injectors - which aren't the easiest thing to control. There aren't many aftermarket ECU that can do it 'properly'. Making an engine run, is very different to making it run correctly. And then you have variabe cam timing etc etc. And then in this case the OP wants to run the LR gearbox - really all this needs to be on the factory ECU with all the none required functions turned off. IRB The home of the first modified Keswick Green 90 - and the first 2.4 Puma through both the 200bhp and 550Nm barriers. www.IRBdevelopments.com www.facebook.com/irbdevelopments www.integrated316.com www.facebook.com/integrated316 |
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30th Apr 2024 9:56pm |
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| sako243 Member Since: 08 Jul 2014 Location: Wales Posts: 1219
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Thanks for that Porny.
It's always fascinated me since designing the electronics side of thing is straightforward. What I'm not familiar with is the actual tuning of the engine. If I ever get the time (or someone interested in part funding it) I'd enjoy building an ECU to run a modern petrol or diesel such as the TDV8. Whilst I can set up the thing to drive the injectors, read sensors etc., at whatever rate is required the algorithm that controls when to fire and how much (for example), i.e. the tuning aspect in my mind, is the big unknown to do well. Ed 82 Hotspur Sandringham 6x6 95 Defender 110 300Tdi |
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1st May 2024 7:04am |
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| Porny Site Sponsor Member Since: 31 Aug 2009 Location: Sutton Coldfield - West Midlands Posts: 809
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If you are wondering what a big power Defender is like...
https://www.facebook.com/share/p/QkJzdzLXodPuxazm/ 680bhp/880nm (650ftlb). 0-60mph in 3.87 seconds. ATB diffs in front/rear and transfer box. Diffs are both pegged.  Click image to enlarge Click image to enlarge |
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1st May 2024 7:29am |
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| diesel_jim Member Since: 13 Oct 2008 Location: hiding Posts: 6093 
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^^^^ Awesome!!
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1st May 2024 7:18pm |
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| L110CDL Member Since: 31 Oct 2015 Location: Devon Posts: 10765 
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WOW that second video, awesome acceleration
1996 Golf Blue 300Tdi 110 Pick up.
Keeper. Clayton. |
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3rd May 2024 9:10pm |
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| SVRDefender90 Member Since: 24 Apr 2024 Location: Wiltshire Posts: 2 
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Evening all, thank you for all the advice. I've had a chat with Nige from Megasquirt who was incredibly helpful and enthusiastic about the build and we've settled on a package that will be suitable (we hope) which will include pegged casings and trussed axle housings. To answer your question on power levels and setup: The supercharger has been upgraded to a Harrop TVS2300 (a 2.3L blower instead of the stock 1.9L) coupled with smaller pulleys and a larger charge cooler to make the 700bhp. The Defender is being run from an L494 Range Rover SVR system. The entire SVR body loom and powertrain including transfer box and modules have been transplanted to the defender minus the components I didnt need (TV modules, depolyable side steps etc), meaning the gearbox, air suspension, traction control, engine, HVAC, adaptive cruise etc is as it would be in a Range Rover. |
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3rd May 2024 10:39pm |
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