Thread: Turbo Rev range TD5

my td5 would run to 4500rpm easily, and with the wick wound up a bit I was getting 20psi boost , no special mods , just open exhaust.

as someone else said changeups at 4200rpm should be the go.

it should pull fairly strongly to 140kmh before falling off.

Fitted the new MAF and car is running best it ever has, loads better. This said, boost only reading up to max 14psi, and was hoping for better, is there anything else I can check ?

It now revs smoothly up to and past 3,000 rpm, changes gear at around 3,200 and back into power band, still no way I can get up to 4,000. Sure it will get closer if I put it in sports mode on the box, but don't think I need to, just wish I could get the boost up higher, as it was running to 15 when I by-passed the modulator and disconnected the MAF. Getting there.....

Ok, so since last post, been trying to work out why the turbo is not boosting past 14 psi, especially with the re-map. So I have realised I most likely did indeed damage the turbo when my dodgy cheapo sensor was ingested into the turbo.


So I increased the boost on the wastegate, and yes the psi increased, up to 17 or 18, but now every time I out my foot down the boost would increase and then fade off, which I guess means the turbo is indeed out of balance and effectively knackered.


Only way I know to be sure will be to replace the turbo unless there is anything else I can check or test to find this out ?


If the turbo is knackered, what is the general opinion on buying a second hand one / re-conditioned / or new ? Feedback greatly appreciated as always.

Back to the original question, have a look at the power & torque curves here

Td5, A Short History - Defender Td5

Both fall off a cliff after 4200 rpm or so.

The most economical is around 2000 rpm.

Regards
Max P

Originally Posted by surfingooner

Ok, so since last post, been trying to work out why the turbo is not boosting past 14 psi, especially with the re-map. So I have realised I most likely did indeed damage the turbo when my dodgy cheapo sensor was ingested into the turbo.


So I increased the boost on the wastegate, and yes the psi increased, up to 17 or 18, but now every time I out my foot down the boost would increase and then fade off, which I guess means the turbo is indeed out of balance and effectively knackered.


Only way I know to be sure will be to replace the turbo unless there is anything else I can check or test to find this out ?


If the turbo is knackered, what is the general opinion on buying a second hand one / re-conditioned / or new ? Feedback greatly appreciated as always.

Time for a VNT upgrade .

Originally Posted by loanrangie

Time for a VNT upgrade .

How much difference do the VNT's make ? And I take it I would have to upgrade the intercooler ?

Also if I hook up a Nanocom, how much can I learn from it ?

Originally Posted by surfingooner

How much difference do the VNT's make ? And I take it I would have to upgrade the intercooler ?

Also if I hook up a Nanocom, how much can I learn from it ?

A vnt has a better spread of power , dont have to upgrade the ic but it will increase the benefits.
Nanocom will tell you if any sensors are bad or if motor is operating correctly.

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Chances of a turbo surviving sensor bits is slim. How much of that is now munching away at pistons.

Id only go 2nd hand if finances were very stretched.

Considered a CHRA? just the turbo core, swap over the housings and away you go. Saves a bit and new moving parts.

Either that or a VNT as Nick recommended. Allisport (and a few others no doubt) do bolt on kits

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