They're E28 M5 throttles complete with plenum chamber. I'm not expecting dramatic gains in power or sound with these as my car has a turbo, but hopefully better response - and they do look cool too
Downside is they may be a bit large, which will mean fuel dropout at low revs/idle and accordingly heavy fuel consumption - and probably less than regular pressure signal to the MegaSquirt which might cause problems
no pics yet (tomorrow hopefully) but so far the bodies are dummy mounted to the M30 head using an aluminium adaptor plate made up by Andy335touring before deciding to use a large twin TB instead.
these fit fine, but making the plenum fit has been a total nightmare. I already have the small diameter Golf mk2 brake servo fitted, but have needed all manner of mods just to get the plenum dummy-fitted. large cut out on rear corner (to be welded once i'm sure it's large enough), top heater pipe cut back and rotated 180 degrees, servo moved towards fusebox by elongating mount holes (as per Brian Moore's M50 swap) and rotated 180 degrees to get vacuum fitting clear of plenum. E34 oil filter housing removed (upside down E28 version required), dipstick tube bent. The plenum is so large it was pushing against the brake reservoir let alone the servo, so that's off too - maybe find a narrower one at the scrappy, maybe a remote one.
current state of play is TBs and plenum temporarily bolted in place and clear of everything, charge piping between intercooler and plenum in place. To do list is, er, long. get plenum cutout welded up, finish ports in adapter plate (the TB ports are a different chape to the ones in the M30 head), throttle cable bracket, seal up all manner of tappings and holes, sort out pressure signal for MegaSquirt/boost gauge/wastegate/dump valve, lots of other things I can't remember...
I guess this lot won't make that much difference on the turbo, but I reckon it might one day end up on a hot N/A M30 build. one day
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