CR box and diff ratios
Discussion
Don1 said:
I have - I went from normal to C/R, and diff was 3.4 to 3.7.
The difference.... from what I remembered, it just 'went' a lot quicker. I worked well with the engine as it loves to rev. Downside - motorway cruising is less efficient...
This was a few years ago, so thinking back the previous setup was good for normal driving, this is good for fast driving.
Str8-Six did the work.
Normal driving - in a TVR? Hah! I'm trying to avoid that; keep the miles down, and the experience special. So far I've managed to drop from 17k/year to 10k.The difference.... from what I remembered, it just 'went' a lot quicker. I worked well with the engine as it loves to rev. Downside - motorway cruising is less efficient...
This was a few years ago, so thinking back the previous setup was good for normal driving, this is good for fast driving.Str8-Six did the work.
Don1 said:
I have - I went from normal to C/R, and diff was 3.4 to 3.7.
The difference.... from what I remembered, it just 'went' a lot quicker. I worked well with the engine as it loves to rev. Downside - motorway cruising is less efficient... This was a few years ago, so thinking back the previous setup was good for normal driving, this is good for fast driving.
Str8-Six did the work.
Don, was this with the Sag or Tam?The difference.... from what I remembered, it just 'went' a lot quicker. I worked well with the engine as it loves to rev. Downside - motorway cruising is less efficient...
This was a few years ago, so thinking back the previous setup was good for normal driving, this is good for fast driving.Str8-Six did the work.
TVRMs said:
Lotus E300S said:
TVRMs said:
Was that from someone who has tried all the variations?
Well known Tvr specialist, also said can damage engine if you are very rev happy.
So it's gearbox AND diff combination that dictates the 'quickest', yeah? Given like for like rubber, power, torque....
TVRMs said:
B
Easy tiger, assumption based on a shortage of information will lead to misinformation.
Standard 3.6 and 4.0 are over geared with a 3.46 diff so could have higher top speed with 3.9.
The combinations and their ability to work well or less well very much depends on engine power and torque characteristics, so our well known dealer, unless he qualified his statement, is talking out of his backside.
Ah, can't use the 'available' gearing of the 3.46? T40ORA said:
Lotus E300S said:
Have been informed that the standard box 3.9 diff is the quickest, what are owners thoughts?
So quicker acceleration than the 3.4, but lower top speed?Standard 3.6 and 4.0 are over geared with a 3.46 diff so could have higher top speed with 3.9.
The combinations and their ability to work well or less well very much depends on engine power and torque characteristics, so our well known dealer, unless he qualified his statement, is talking out of his backside.
So hence the concept of a standard box, or CR, whilst running 404bhp and about 350'ish ftlb torque with a 3.7?
TVRMs said:
The close ratio box keeps the engine on the boil. If you gents don't understand the benefits don't bother. You asked me what I would do., I advised what I would do and what I have done in the past.
I know I'm a mechanical numpty, but, as I understand it, it's all about optimising the gearing (combination of 'box and final drive) to ensure that gear changes allow the engine to stay comfortably in its power band?Or, not wanting to experience the ire of Uncle John
, stay in the torque band (one of those will be wrong so I've covered both bases Gassing Station | Tamora, T350 & Sagaris | Top of Page | What's New | My Stuff