letmeshowyou Posted September 9, 2015 Share Posted September 9, 2015 Was that a bumpy road? Why does it look so skittish on those videos? Quote Link to comment Share on other sites More sharing options...
Luxluc Posted September 9, 2015 Share Posted September 9, 2015 That is awesome Lee : wow. Quote Link to comment Share on other sites More sharing options...
Lee P Posted September 9, 2015 Author Share Posted September 9, 2015 Was that a bumpy road? Why does it look so skittish on those videos? It's a bumpy county lane just at the bottom of our driveway Quote Link to comment Share on other sites More sharing options...
letmeshowyou Posted September 9, 2015 Share Posted September 9, 2015 Ah ok, makes sense now. Great project, curious how an 8sp box with so much torque will be on WOT! Quote Link to comment Share on other sites More sharing options...
Phlukey Posted September 9, 2015 Share Posted September 9, 2015 Very cool, nice work SRD Quote Link to comment Share on other sites More sharing options...
Lee P Posted September 9, 2015 Author Share Posted September 9, 2015 Looks awesome What diff are you using? And any idea what the theoretical top speed is with the gearing? This could potentially be a bit of a game changer - much quicker through the gears than a 6 speed or tiptronic, and better motorway fuel economy. We chose to put a 6 speed diff in this as its closer to the ISF ratio The ISF ratio is 2.94 Auto diff is 3.769 6 speed is 3.266 The ISF owners talk about changing to a 3.266 as they feel that the higher gears are just for cruising so that ratio should suit pretty well. Will give great acceleration but as you say cruising on the motor way will be good fuel economy as rpm will be low. I have a chart of the speed per gear on the ISF, will post it in a sec Quote Link to comment Share on other sites More sharing options...
Josh42 Posted September 9, 2015 Share Posted September 9, 2015 What's the cost of this conversion Lee? Great work, good to see you pushing new possibilities Quote Link to comment Share on other sites More sharing options...
Lee P Posted September 9, 2015 Author Share Posted September 9, 2015 What's the cost of this conversion Lee? Great work, good to see you pushing new possibilities Not worked it out yet as some parts are prototype but once it's finalised will post full details Quote Link to comment Share on other sites More sharing options...
Lee P Posted September 9, 2015 Author Share Posted September 9, 2015 This is the ISF speed chart Quote Link to comment Share on other sites More sharing options...
Glanza_Mike Posted September 9, 2015 Share Posted September 9, 2015 awesome, 80mph at 2krpm is fantastic Quote Link to comment Share on other sites More sharing options...
j_jza80 Posted September 9, 2015 Share Posted September 9, 2015 Due to the supra diff ratio, it will be a bit higher than that Mike. Quote Link to comment Share on other sites More sharing options...
Wez Posted September 9, 2015 Share Posted September 9, 2015 Nice work :thumb: Over 100mph in reverse Quote Link to comment Share on other sites More sharing options...
johnny g Posted September 10, 2015 Share Posted September 10, 2015 Looks awesome What diff are you using? And any idea what the theoretical top speed is with the gearing? This could potentially be a bit of a game changer - much quicker through the gears than a 6 speed or tiptronic, and better motorway fuel economy. It is win win for everyone I think. From what I've read, the AA80E box can change gears pretty quickly. 0.1s on upshift and 0.3 downshift, that was on the Lexus ECU. I suspect the Syvecs can speed that up. Pretty epic really. Quote Link to comment Share on other sites More sharing options...
Big Supes Posted September 10, 2015 Share Posted September 10, 2015 Will it have an auto mode as well? I could see myself getting a little bit irritated having to constantly change gears (being 8 speed). Quote Link to comment Share on other sites More sharing options...
mellonman Posted September 10, 2015 Share Posted September 10, 2015 why does is over rev when changing is the lower gears ? I take it thats because you still have your foot on the throttle and as the gear changes Ie clutch engaged the revs rise as would in a manual car if changing gears with out moving the throttle ? Quote Link to comment Share on other sites More sharing options...
imi Posted September 10, 2015 Share Posted September 10, 2015 Impressive Quote Link to comment Share on other sites More sharing options...
Ric Posted September 10, 2015 Share Posted September 10, 2015 why does is over rev when changing is the lower gears ? I take it thats because you still have your foot on the throttle and as the gear changes Ie clutch engaged the revs rise as would in a manual car if changing gears with out moving the throttle ? I assume thats down to it not been mapped fully yet? Quote Link to comment Share on other sites More sharing options...
j_jza80 Posted September 10, 2015 Share Posted September 10, 2015 Will it have an auto mode as well? I could see myself getting a little bit irritated having to constantly change gears (being 8 speed). being an auto gearbox, you'd hope so Yes, it does. Quote Link to comment Share on other sites More sharing options...
johnny g Posted September 10, 2015 Share Posted September 10, 2015 Just worked out the gearing - and made the following assumptions. Final Drive: TT JSpec 6spd Facelift Tyre Width: 275 Aspect Ratio: 35 Rim Size: 18 Speeds at 7000rpm are: 1st: 36.5 2nd: 61.6 3rd: 90.0 4th: 114.5 5th: 136.2 6th: 167.7 7th: 203.5 8th: 244.8 80mph would be: 3rd: 6500rpm 4th: 5000rpm 5th: 4250rpm 6th: 3400rpm 7th: 2850rpm 8th: 2350rpm Not too bad at all. Moving to a Auto Diff: 1st: 30.7 2nd: 51.9 3rd: 75.8 4th: 96.5 5th: 114.8 6th: 141.3 7th: 171.4 8th: 206.2 80mph: would be: 4th: 5700rpm 5th: 4900rpm 6th: 4000rpm 7th: 3300rpm 8th: 2700rpm I think the Auto Diff would suit it best. Quote Link to comment Share on other sites More sharing options...
Lee P Posted September 10, 2015 Author Share Posted September 10, 2015 (edited) Will it have an auto mode as well? I could see myself getting a little bit irritated having to constantly change gears (being 8 speed). Yes of course full auto mode Manual mode and a sport mode. why does is over rev when changing is the lower gears ? I take it thats because you still have your foot on the throttle and as the gear changes Ie clutch engaged the revs rise as would in a manual car if changing gears with out moving the throttle ? As said this is just purely a base calibration just to get the car driving but think it's more the Rev counter. Edited September 10, 2015 by Lee P (see edit history) Quote Link to comment Share on other sites More sharing options...
Lee P Posted September 10, 2015 Author Share Posted September 10, 2015 Just worked out the gearing - and made the following assumptions. Final Drive: TT JSpec 6spd Facelift Tyre Width: 275 Aspect Ratio: 35 Rim Size: 18 Speeds at 7000rpm are: 1st: 36.5 2nd: 61.6 3rd: 90.0 4th: 114.5 5th: 136.2 6th: 167.7 7th: 203.5 8th: 244.8 80mph would be: 3rd: 6500rpm 4th: 5000rpm 5th: 4250rpm 6th: 3400rpm 7th: 2850rpm 8th: 2350rpm Not too bad at all. Moving to a Auto Diff: 1st: 30.7 2nd: 51.9 3rd: 75.8 4th: 96.5 5th: 114.8 6th: 141.3 7th: 171.4 8th: 206.2 80mph: would be: 4th: 5700rpm 5th: 4900rpm 6th: 4000rpm 7th: 3300rpm 8th: 2700rpm I think the Auto Diff would suit it best. We drove it with the auto diff and first gear especially felt very short Feels much better on the 6 speed diff Will see how it is when mapped and may try an auto diff as well Quote Link to comment Share on other sites More sharing options...
MATT RR Posted September 10, 2015 Share Posted September 10, 2015 This is great work Lee, looking forward to seeing the final results and costs Quote Link to comment Share on other sites More sharing options...
imi Posted September 10, 2015 Share Posted September 10, 2015 gearshift looks very quick and smooth - I presume its still possible to put the gearbox in full auto mode? Quote Link to comment Share on other sites More sharing options...
Littler Posted September 10, 2015 Share Posted September 10, 2015 Which auto diff has you used in your workings Johnny? A UK 3.538 or jspec 3.769? Quote Link to comment Share on other sites More sharing options...
j_jza80 Posted September 10, 2015 Share Posted September 10, 2015 I have to agree with Lee, as an all round package the 6 speed diff is preferable. and the taller gearing shouldn't make that much of a difference in the real world due to the number of ratios on offer Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.