My "guess" would be high speed understeer.
(big wing and nothing done on the front to help the balance makes an already understeer prone car worse)
Hope his recovery goes well.
Gave mine a big rev one afternoon out playing and it went a bit flat and developed a miss on boost.
Pulled it down to find a broken outer Ferrea spring, if the motor hadn't had duals it would now be junk.
http://ij.supramania.com/spring.jpg
When I got my PWR way back it wasn't right!
The fitment was lousy and there were missing and misaligned mounts.
I took pics did some drawings and posted it and a stock Mk3 radiator back to PWR and had them correct it all so further production units would be right.
When you pull full lock on the steering the load can drag the Idle down this opens a port to the TB and increases the idle speed so the car doesn't stall.
Sorry I couldn't be of more help Ed.
The 7M head has a bunch of very specific parameters needed for the initial setup, once they're correct it's all just fine tuning/adjustment via shims.
I don't have that luxury being shimless so mine needs to be "right".
Find ir really odd that you...
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