James have you sat down and worked out where all your new "FD" gear changes will be on various tracks? I sort of did in an amaterurish way, with help from a thread I started on PH, came to the conclusion that unless I could actually change all the ratio's (as per Kenny) the FD alone would give more pain that gain.....need 55-60 in first and around 20mph jumps to 130 - woods for the trees and all that......
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You want about an average of about 22% jump per gear really (although generally will have a little more lower down and then less in the higher gears), then you can have a 60mph first and 132mph fifth, but the cost of doing so is massive, far beyond James's current budget.
That would be the worst possible choice of box he could make, as it would guarentee he never scores a point in tintops.
Yes I agree but the only thing I am unsure of is the fifth gear now that I am set on the FD for the car, Changing fifth will give me 129MPH and my top speed this year has been 130 or a little more than this at Spa where I was well into fifth. I think for the slight compromise of the standard fifth it will give me more flexibility. If I fit the modified fifth into last years car then I would bounce of the limiter very slightly but with the diff, engine and suspension tweaks I would like to hope my cornering speeds would be a little higher along with faster at the end of a straight this year. If this is the case then I would be bouncing off the limiter further down the straight.
Yes mate but only the ones I have got data from, in theory it should be the best option that I have available to me. As everyone says 1st is the downside and also 5th is a slight compromise as I will need to be in 5th for some corners. I know what you mean Pete
Unfortunately so
Just found a better 5th though! Only slightly better than the std but will drop top speed to 141mph
Clio 172
Explanation for this please.
Tintops rules sequential boxes, so he wouldnt be allowed to race his car anymore in that series.
Oh I know, getting there quicker counts for more.
Clio 172
LOL ok.
39/32 JC5-131 and a few others
Are you swapping the FD and fifth on your gripper? It's the 4.29 at the moment isn't it?
Did you find there was a "okay" setup for Clio friendly track's like Brands and Oulton and a comprise for the likes of Silverstone where its more a power circuit where clio's don't compete for wins so much? If so what was the FD ratio?
Indeed, whoever is pulling hardest out of the bends has a distinct advantage.
Yeah that was my thoughts, not sure I will ask Martin!
I plan to use what I have, I was told it was a 14/60 4.29, 10% reduction I believe?
I just looked and and its a jc5 130 non speedo drive so I'm presuming its a 182 box with slightly longer ratios than the 172 cup, is that right? 172 cup is the best of all ratios in the 1*2 range?
Increase not decrease on the FD mate
All 5 gears in the 130 and the 089 are identical
All 5 gears in the 130 and the 089 are identical
What code are the 172 cup boxes? I was under the impression they were just ph2 boxes but with a speedo drive, I wasnt aware the actual gear ratios themselves were different?
The actual main shafts with the 4 cogs on (which cant be removed as they are part of it) are the same between all 172 boxes as far as I am aware.
132 is WIDER ratios than standard 172 (ie 089, 130) ones, as 3rd is the same but 1st is lower geared, wouldnt be an upgrade at all IMHO, in fact quite the opposite.
089 is what I was told the cup's have
089 is what I was told the cup's have
Thats a phase 1 box, with the taller FD, so seems a poor choice by renault for a "sporty" model?
I compared my 172 cup to my 182 using my phone as GPS speedo and they had the same top speed in each gear. One gear was slightly different but I decided I'd just made a mistake with that one.
That 132 figure was purely off the top of my head as I'm unsure if that is cup, just remembered hearing that. When I said "closer ratio's " I meant different final drives, the wrong choice of words from me really as it doesn't close up the ratios like Kennys box would by actually changing driven/driver numbers of the gears, it just reduces the top speed while bringing maximum gear speeds down via the change in FD = faster acceleration?? Right Chip, Ash?
All I'm worried about this year is the two wheels lock together lol, later on I will evaluate the need to change ratios as I drive mine more.
Can you give a % difference with my 4.29 final drive against the 130 box please chip. Your good with numbers n s**t!
Edit: PM me if you want to save Ash's thread.
Can you give a % difference with my 4.29 final drive against the 130 box please chip. Your good with numbers n s**t!
Edit: PM me if you want to save Ash's thread.
| Teeth in | Teeth out | Gear Ratio | Change ratio | Overall Gearing | MPH @ 7500 | MPH @ 8000 |
| 11 | 34 | 0.324 | 0.075 | 38.5 | 41.1 | |
| 22 | 41 | 0.537 | 1.659 | 0.125 | 63.9 | 68.1 |
| 28 | 37 | 0.757 | 1.410 | 0.177 | 90.1 | 96.1 |
| 34 | 35 | 0.971 | 1.284 | 0.227 | 115.6 | 123.3 |
| 37 | 33 | 1.121 | 1.154 | 0.262 | 133.4 | 142.3 |
| 39 | 31 | 1.258 | 1.295 | 0.294 | 149.7 | 159.7 |
| Crown | Pinion | Diff ratio | ||||
| 60 | 14 | 4.286 |
So to confirm I have the 37/33 5th gear fitted in my 130 but I could fit the jc5 106 5th to lower top speed( what car is this from)
The 37/33 is what is in the 106 for 5th, so I dont understand the question you are asking?
Sounds like you are saying if you swap from 37/33 to another 37/33 will it lower your top speed?
182cup & 172 racecar
It all seems to be getting a little over teccy in here atm.
James, are you racing at Spa, if not, why are you bothering about hitting the limiter in 5th and compromising all the other circuits?
Can't see the point myself, but if you come whizzing past, then I may have to look into it further, but until then I'll keep it simple.
James, are you racing at Spa, if not, why are you bothering about hitting the limiter in 5th and compromising all the other circuits?
Can't see the point myself, but if you come whizzing past, then I may have to look into it further, but until then I'll keep it simple.
LMAO, basically...what 5th gear is in a 130 box standard and what is the jc5 106 fitted to?
I'm sure Mark told me he fitted the shorter 5th and in that case you have the 37/33. That is the shortest you can go, the other option is to swap the FD which gripper can provide in the new ratio's they are doing.
Yeah it's all just trying to calculate weather or not to fit the shorter fifth or not. The three top speeds could be 129, 141 or 146.
Not 100% racing at Spa no, I didn't really see it as a compromise on the other circuits by having the longer 5th as it's still lower than the standard FD but still gives me the flexibility.
I know exactly what you mean Tony but while I'm doing it just want to make sure I do it right
Lol!The 106 is a megane box IIRC, but dont worry about trying to track one down, just buy the 5th gear from agency brand new they arent dear (65 quid IIRC).
