Ace system / 2 inch lift

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J

Jaykay1987

Active Member
Posts
109
Location
Liverpool
Hi guys, just bought an 03 td5 auto.

Still has ace system & running bags on the back. Ive just put my new 265/75/16 on and ordered my terrafirma 2 inch lift kit to convert to springs. I only plan on some green laning nothing extreme.

My question is, do i have to remove the Ace system? If i do have to remove it, why? what would happen if i dont? what are the con's & pro's.

Cheers.
 
Hi. My advice is to keep the ACE cos it will help much on a lifted vehicle but you should recalibrate the accelerometers with dedicated tester cos the vehicle's gravity center is higher than they were calibrated from factory.... though this should be your last concern as long as you dont have proper tuning for those huge tyres, especially on automatic vehicle where the VSS is important part of the engine management too, beside the ABS and related systems... it's complicated, here's just a small part of it https://www.landyzone.co.uk/land-rover/255-65-or-255-70-pros-and-cons.292220/#post-3620824 ... anyway i strongly recommend an EGT gauge if you want to keep that vehicle "healthy"
 
Thanks for the reply.

im not tech savvy at all.

I dont know anyone near me who can recalibrate the ace system, so would i be better removing it?

Nor do i know anyone to tune my tyres. I understand stopping distance an speedo outage, but other than that would it raise any failure to parts?

also why would i need an egt gauge?
 
I had 2" lift with ace and air bags. Removed it about half year ago. I am sure that my ace was not recalibrated and when i removed the lift could not recognize any difference. Surely Sierrafery is right and if you have tool, recalibrate it.
But just an example in my case. When i removed lift kit my car has lowered with about 5cm. I installed new standard front springs and shocks and it become higher again so it is about 3cm lower compared to lifted. No change on ace setting. So i do not think that for 5cm change the ace is so sensitive.
But why do you convert the back to coils? I had lifters under the bags which worked great.
 
The ACE will work even without reclibraion but once done it will work 100% as it should no need to remove it. If you read carefully what's after the red part in my linked post you should understand why you need EGT gauge... cos with those tyres there is a chance to exceed the safe 750*C limit uphill then you know to be more gentle with the throttle or your engine will suffer bad...
Jaykay1987 said:
Nor do i know anyone to tune my tyres.
Click to expand...
it's about tuning the powertrain and cooling system not the tyres

speedo outage means modified VSS which is part of the powertrain management so as long as it's out of the factory limits the mangement will be mixed up resulting in higher EGTs
 
When i removed lift kit my car has lowered with
But why do you convert the back to coils? I had lifters under the bags which worked great.[/QUOTE]

Just ive had them go on me in the past, dont get me wrong the drive alot better with bags, but id rather put coils on
 
sierrafery said:
The ACE will work even without reclibraion but once done it will work 100% as it should no need to remove it. If you read carefully what's after the red part in my linked post you should understand why you need EGT gauge... cos with those tyres there is a chance to exceed the safe 750*C limit uphill then you know to be more gentle with the throttle or your engine will suffer bad...
it's about tuning the powertrain and cooling system not the tyres

speedo outage means modified VSS which is part of the powertrain management so as long as it's out of the factory limits the mangement will be mixed up resulting in higher EGTs
Click to expand...

ahhh thanks, that makes sense...as it does hold in gear alot longer than usual...so what would i need to do to correct it? some sort of tune/remap of sort?
 
Jaykay1987 said:
ahhh thanks, that makes sense...as it does hold in gear alot longer than usual...so what would i need to do to correct it? some sort of tune/remap of sort?
Click to expand...
Yes, a remap which is addapted to the VSS input with those tyres fitted as to keep the other elements of the fuel map within decent limits cos the VSS is lower at the same rpm... the ECU expects a certain speed to be achieved based on the driver demand(TPS input) and rpm as it was mapped for std dimension tyres, as it doesnt get that speed it will increase the IQ(injected quantity) accordingly which means overfuelling/high EGT... in a nutshell the vehicle will behave like when it's very loaded or towing without being so and if you load it the EGT can go on the red zone and that's bad for the engine's longevity... i gave some examples with what difference can be with only 5% difference so the bigger the difference is the higher the EGT will go with less engine power... IMO fitting bigger tyres without proper tuning for them gives you ONLY a bit of more ground clearance while it mixes up everything which is VSS dependant.
 
sierrafery said:
Yes, a remap which is addapted to the VSS input with those tyres fitted as to keep the other elements of the fuel map within decent limits cos the VSS is lower at the same rpm... the ECU expects a certain speed to be achieved based on the driver demand(TPS input) and rpm as it was mapped for std dimension tyres, as it doesnt get that speed it will increase the IQ(injected quantity) accordingly which means overfuelling/high EGT... in a nutshell the vehicle will behave like when it's very loaded or towing without being so and if you load it the EGT can go on the red zone and that's bad for the engine's longevity... i gave some examples with what difference can be with only 5% difference so the bigger the difference is the higher the EGT will go with less engine power... IMO fitting bigger tyres without proper tuning for them gives you ONLY a bit of more ground clearance while it mixes up everything which is VSS dependant.
Click to expand...

Yea that all makes perfect sense! thanks sierrafery...A little update on those tires...

Im in liverpool and yesterday we had a little drive to blackpool with the missus, 3 kids & mother in law...i know, what a drive!

Anyway, we had a bit of luggage in the boot, pram, bags n such...I was only travelling on the M6 north and if i kept it at 70 it was fine, but the odd time i had to slow to below 60 on the slightest of gradiant on the m6, it would kick down and the revs get higher and my speed never changed! no pull what so ever.

I have a set of 18 & 16 inch rims, out of the two...what are the biggest/best size tyre i can go before it all starts effing everything up?

Also quick note, it never over heated at all temp sat perfectly in the middle but to note when ever i came to stop at a junction, my temp dropped alot.
 
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