I know of two V8 owners who have ran both VAP and Viezu tunes. Both will wholeheartedly recommend VAP (they ran Viezu first based on videos like the one above).

They both lurk on these forums from time-to-time so they can chime in themselves when they get a chance to read this. One of them is currently replacing his blown engine (which died from overheating, not a lack of oil). He was mostly running the Viezu tune prior to this. VAPs data logger is also a life saver for both optimal running and preventive maintenance. I diagnosed my own failing low pressure fuel pump from data alongside Chris at VAP.

Replying to the OP, from the data I've seen (and I've seen a fair bit), it would make more sense to add a second smaller radiator in loop with the OEM one alongside an upgraded pump (Bosch 010 or Pierburg CWA100-3).

 

Has anyone done and documented this?

 

ss23 can you tell us more about the VAP data logger?
I have the lower pulley and Stage II tune from them but maybe I missed the data logger? Some kind of OBDII dongle?
It would be a useful tool as I have never sent any data logs to VAP for recommendations.

All these numbers mean nothing until he takes to a track with 3rd party verified timing and speed devices. A Dyno can be made to read anything you want.
The track is where all the BS is left behind.
Can anyone post 1/4 miles times and speeds that cars with this tune have posted? I mean post copy of time slips not some random numbers you heard somewhere?
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Terrance39:

https://www.jaguarforums.com/forum/f...hanger-221559/

 

I've compared logs from the VAP datalogger between myself and another owner who have the exact same mods (including the Pierburg pump) except for the extra heat exchanger. His temps were about 20C below mine compared to ambient (we both have dual pulleys and live in extremely hot climates). His setup is the same as Terrance's linked above.

It's a dongle that you connect to your laptop and is tied to your VIN. It measures many variables including temps, boost, ratios, timing, etc. Chris then modifies your tune based on the logs to have it running as best as possible. Essentially it helps Chris to almost write a custom tune for you instead of the base VAP tune.

Also helps to diagnose issues - one other owner and myself both diagnosed issues with the logger.

Btw, the TCU tune is also another good mod if you want to go further.

 

Thanks for the good info! I do talk to Chris now and again so I will follow up with him.
Was the data logging an additional charge?
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Yep, you need to order an additional OBD reader from VAP:

https://www.velocityap.com/product/j...oftware-cable/

 

OK another use for my clone Mangoose cable!
I will research this further as my data logging so far has given me confusing results so I don't trust what I have done at all.
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