D2 TD5 surging full acceleration issue

**AK83** · 1st June 2018, 06:35 AM

Originally Posted by John_D2

..... I haven’t seen my MAP over mid 400’s and definitely not as high as 600 (nanocom readings) .....

MAP, or MAF?
Don't confuse the two.
MAP on the inlet manifold : MAF is the airflow meter.

As instructed on here, I did WGM bypass on brother's TD5 when it started to surge. no surge. replaced WGM(about $60). done!

We thought about adjusting the rod too, but only if the WGM bypass didn't help.
So he still gets his 1.4(whatever)BAR max boost according to the nanocom.

Do you have an EGT(exhaust temp gauge)?
With lower boost, and using a modded/chipped ECU, there could be the possibility that your exhaust could be running hotter/too hot too.

**twr7cx** · 1st June 2018, 10:25 AM

Originally Posted by John_D2

This all started after I’d removed the turbo & gave it to a friend to drill out a broken stud. Until then I had no issues.

It's likely that with the broken stud there was some leakage of exhaust gas which can result in the turbo not spinning as much. When my exhaust manifold broke studs and was leaking I experienced a decrease in performance, fixing the issue perked the motor back up as now the full exhaust gas flow was going to spin the turbocharger.

Originally Posted by John_D2

So now I’m at 1.18bar with the wastegate module at 40% (last screen on nanocom). I don’t know if 40% is good or not. Going to try another tweek to see if I can get closer to mid1.25/1.3bar.

Seems to be running fine. No issues with full acceleration now.

Glad to hear that it resolved your issue. If you desire to increase the boost pressure back up then there are options as I mentioned earlier, some ECU tune tweaking could likely be enough.

**AK83** · 1st June 2018, 03:25 PM

Originally Posted by twr7cx

.... If you desire to increase the boost pressure back up then there are options as I mentioned earlier, some ECU tune tweaking could likely be enough.

I think John had TRS 'chip' his ECU a while back already.

**John_D4** · 1st June 2018, 04:05 PM

Originally Posted by AK83

I think John had TRS 'chip' his ECU a while back already.

Yes and I don’t think Phil will adjust my tune for free if at all

**John_D4** · 1st June 2018, 04:06 PM

I’ll play with the WGV bypass these days off also

**twr7cx** · 1st June 2018, 08:47 PM

Originally Posted by AK83

I think John had TRS 'chip' his ECU a while back already.

That's great, but what I'm talking about is someone who will apply the modifications in the tune to the MAF and MAP as appropriate to resolve the issue being experienced with the higher boost. There's some discussion in the Technical Forum if you want more details of what I mean or I've linked it previously in this thread.

**John_D4** · 1st June 2018, 09:54 PM

Originally Posted by twr7cx

That's great, but what I'm talking about is someone who will apply the modifications in the tune to the MAF and MAP as appropriate to resolve the issue being experienced with the higher boost. There's some discussion in the Technical Forum if you want more details of what I mean or I've linked it previously in this thread.

I did have a look at that link but I had some trouble digesting. I’ll take a more thorough look at it. From what I recall it involved changing the sensor to a larger 1?

**twr7cx** · 3rd June 2018, 02:56 PM

Originally Posted by John_D2

I did have a look at that link but I had some trouble digesting. I’ll take a more thorough look at it. From what I recall it involved changing the sensor to a larger 1?

In regards to the MAP sensor, that is one option to move to an uprated sensor such as a the Mercedes Benz or VAG units which are both direct fits. But there is also some adjustment in the parameters of the standard MAP sensor which may suffice.

Then there's also options with the MAF sensor.

**John_D4** · 3rd June 2018, 10:30 PM

The waste gate is definitely doing funny things. It was set the other day to around 1.2, then last couple of days it’s only reaching 1.08 or so and not holding a steady reading.

I’ll look at trying the bypass tomorrow. Correct me if I’m wrong, but from what I’m reading that will tell me if it’s the WG solenoid. If that’s ok, can I open the waste gate and visually check and clean it without breaking it? Or is it a take to a turbo shop deal?

Also, if my airflow is no greater than 400’s or so is there any benefit in changing the MAP sensor for a larger one?

**lyhoon94** · 3rd June 2018, 10:53 PM

Originally Posted by John_D2

The waste gate is definitely doing funny things. It was set the other day to around 1.2, then last couple of days it’s only reaching 1.08 or so and not holding a steady reading.

I’ll look at trying the bypass tomorrow. Correct me if I’m wrong, but from what I’m reading that will tell me if it’s the WG solenoid. If that’s ok, can I open the waste gate and visually check and clean it without breaking it? Or is it a take to a turbo shop deal?

Also, if my airflow is no greater than 400’s or so is there any benefit in changing the MAP sensor for a larger one?

Hi John_D2,

I don't think an internal wastegate actuator can be opened or if it can, I dont think theres much point to it as I believe the internals aren't serviceable.

I was looking at a few replacement options and have the three below

Oem:TD5 Turbo Waste Gate Actuator

Forge:Adjustable Actuator for Defender or Discovery TD5 | FMACTD5 | Forge Motorsport

Turbosmart:Turbosmart IWG75 Landrover TD5 17psi – T.I. Performance

Hope I didn't misread your post and that this actually helps.

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