Modifying a TD5 for more performance

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Originally Posted by Naks

AFAIK, that should not happen. Have you bypassed the turbo vacuum advance thingie?

Not sure what the proper name is, but there's a small pipe (approx 6mm diameter) that goes from the inlet manifold into a (stupid) device, and from there another similar pipe goes onto the turbo.

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Electronic Wastegate Controller

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Originally Posted by Naks

If you bypass that device, the boost goes to 1.2 and stays there. In the original setup, the boost fluctuates wildly between 0 and 1.2.

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you would only have wildly fluctuating boost if the controller is suspect. it is less than 2 minute job to replace and costs only about $55, so i would replace it rather than bypass it. in adition if you bypass it, you may end up with the inevitable wastegate creep where the turbo wont be able to make as much boost early. with the electronic controller in place working properly, the boost will come on earlier and will be more controlled.

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Originally Posted by Naks

bang for buck the best performance mod to a Td5 is to remove the middle silence box and if present the cat. ;)

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warning for the unwary. in qld, if qld transport check your vehicle and it was orginally fitted with a cat and you remove it, big fines and off the road you go until you get it refitted. don't know about other states though.

Quote:

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Originally Posted by Naks

AFAIK, that should not happen. Have you bypassed the turbo vacuum advance thingie?

Not sure what the proper name is, but there's a small pipe (approx 6mm diameter) that goes from the inlet manifold into a (stupid) device, and from there another similar pipe goes onto the turbo.

If you bypass that device, the boost goes to 1.2 and stays there. In the original setup, the boost fluctuates wildly between 0 and 1.2.

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Yes, it shouldnt happen.
The pressure pipe was blown off the (stupid) device. (waste gate controller)
Not able to test drive it today.
It was hot and I was thirsty.
Will do it tomorrow.

Pulls like a train and the power uphill stays.

Where in Brisbane can you get the ecu flashed and about how much does it cost?

Just a word of caution. The wastegate on a TD5 is just adequate. Once you start pulling some real horsepower it is likely the boost will go past the approx 19psi fuel cut point under high revs hard acceleration. Have a Def TD5 with exhaust opened up, chipped, BIG intercooler 600x300x76, diesel/gas and boost set to 17.0psi. AFRs are ideal under load and EGTs are good. But, it tips over the fuel cut point quite often when driving hard. In an effort to compensate we adjusted the waste gate actuater to 13psi and put in a Turbosmart boost controller to get the boost back up again. Theory behind this was to ensure the wastegate was opening as far as possible. It made no difference. As soon as the engine starts making near max exhaust gas the boost rises beyond the control pressure and fuel cut occurs. Next step is an external wastegate or a different turbo setup completely.

Can anyone tell me what turbo options are readily available for TD5.

Dave

Td5 alive sell a boost box that allows more boost through the motor and stops the fuel cut. I'm not sure for defender but it limits it to 24PSI for the Disco. With the bigger intercooler this apparently leaves everything safe for the engine.

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Originally Posted by farmport

Can anyone tell me what turbo options are readily available for TD5.

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Dave, there's a UK outfit that sells a VNT turbo for the TD5 - I cannot remember which one, sure Google will reveal it.

IIRC, it's simple enough for a DIY job

TD5 Boost boxes are not made by TD5 Alive...
They are a B-A-S unit, rebadged and distributed by Gary.

I have a few of the units here at the moment.

Farmport - What size exhaust are you running? I'll put money on it its 3" ;)

Just to cross reference another possible performance thread for TD5s

http://www.aulro.com/afvb/technical-...af-bypass.html