Esprit Turbo project car - part3 - the further continuation

[drdoom 445]

Outstanding! Devil's in the details, so far as tuning is concerned.

[Lotusfab 3,312]

Still can’t believe what effect changing the choke size has had. My S1 has always drove extremely well and set the bar. I would say now the Turbo drives even better than the S1. Its a relief after so long to have perfected the acceleration. Your always scratching around in a no mans land with these changes.

[LOTUSMAN33 1,522]

Well done Fabian, many would have just accepted the stumble but as usual you persevere to get things just right. A turbo driving well is such a rewarding car to own as well. 👍🏻
 

Dave  

[drdoom 445]

2 hours ago, Lotusfab said:

Still can’t believe what effect changing the choke size has had. My S1 has always drove extremely well and set the bar. I would say now the Turbo drives even better than the S1. Its a relief after so long to have perfected the acceleration. Your always scratching around in a no mans land with these changes.

It's worth considering that your focused efforts in sorting the other carb settings are largely the means by which you've arrived at this most pleasant outcome. Be assured the slight reduction in choke size did nothing more than enrich the transition point which, though it may well have been helpful, is subordinate to the accurate balancing of float heights and throttles in terms of running behaviour. 

Cheers!

[Lotusfab 3,312]

Thanks Dave. Steve, Interesting point. The only changes made were float height and choke. When I tune these cars I always found on my S1 there is a position on the idle mixture screw that gives a big boost in power output. Its not very wide probably in the 1/4 turn range. On my turbo I have never been able to reproduce this effect to the same extent. I noticed this time when I tuned it I was able to locate the position and the effect was similar to the S1. Was this due to a change in float height?
I don’t really know. All I can say is its now running perfectly. I would know for sure If I switched the chokes back and the stumble returned. Because of the work involved and the fact my car is now sorted I will not do this at this time. Maybe someone who has a stumble they can’t get rid of might try using 35 mm chokes and report the effect? Thanks for all the helpful advice and discussion it has really helped to sort my car! 

[LOTUSMAN33 1,522]

@Paul Colemanwas saying he had a stumble on his S1.

[Lotusfab 3,312]

Oh yes I’ll tell him.