Six new NGK triple electrode plugs, made in Japan (so the boxes say), now fitted. And just like that, the idle and reviness are back. I've uploaded Doug's ignition advance, which looks a lot like a TR6 PI advance, and the engine seems to like it.
Today's road test (dodging the cops as always because it isn't registered yet) shows that although the wideband says it's running an AFR around 14, it's definitely running rich judging by the pups of black smoke. I'll take Craig's advice and recalibrate the O2 sensor. Easy for him to say, he has a hoist!
Tonight I'll read up on how to log data, so I can gather data to see how to set the MAP to throttle position sensor crossover for the throttle bodies.
By the way, has anyone found a good table of injector dwell / dead time / latency? I'm using 0280 156 080 injectors.
That's right, my car, abused as it was, seems to have spent most of its life in dry climates. You've reminded me of the hassle of posting those uprights to you, having them sent back because of snow, and then me hand-delivering them while on holiday. After all that trouble they should have been perfect.
As for the diff, Craig and I can recommend the Subaru conversion. No more diff-shaped time bombs!
Have also been fortunate in collecting a few sets of NOS 150 and 175CD's as well as buying a few cheap Used (as in so totally shagged you wouldn't believe it) sets.
And the used sets some apparently just removed from running cars can be in appalling condition with completely mismatched springs and jets, I find it strange that people will spend a small fortune on nice bits, but totally neglect what was/is actually a high precision made assembly.
I also suspect that SU's gained greatly in popularity because some people knew how to tune them, but scratched their heads when it came to Strombergs, I'd bet a lot that a well set up pair of Strombergs would maintain their tune way longer than SU's, there's just so much less to go wrong and wear!
Very good information presented.
Yes, I have PI ITB's.
I will LOG the TPS sites with more emphasis on part throttle and decrease the resolution up to WOT.
The car is running so much better & runs fine in 4th with OD switching in & out at 30 speed limits. I would have been using 3rd before with OD.
I have adjusted the speed & load integer from 32 to 127 and will burn the adjustments in when arrive back at work in the morning. I have limited max change to +/- 10%, but will increase the + to 15%, as saw a few sites at +10% required.
Under snap acceleration, the AFR drops to > 15 before going to 12 ish; Need to revisit acceleration enrichment table i.e. "Accelerate pump".
Thanks everybody for you help. Especially Obe, for his emerald knowledge and recommending the AEM Lambda that will soon pay for its self..
Thank You all for putting the Triumph smile back on my face.
Few people realise how knackered, as in utterly knackered, their carbs are.
I've a couple of sets of NOS 175 Strombergs, the difference between them and a 50 year old set is astonishing.
I rather suspect the fascination with replacing Strombergs with 'better performing' SU's was simply the SU's were just newer and less worn.