enigma
26-11-2004, 09:28 AM
I have had a change of heart with gearbox selection for VX. Basically I now want 2 Auto boxes.
WHY? I hear you shout! Well manuals require clutches and these tend to be very expensive, also zentac fried one in short time, Zedy1 says his brand new one is slipping on only slightly increased power. Also fabricating a mechanism to ensure both boxes change using 1 clutch and 1 gear lever will be tricky (not impossible though!). As for selecting 1st with one engine/gearbox and R for the other would be a total nightmare.
So I have done some research and the answer is 2 INVECSII AUTOS. :D But hat about all that nasty wiring? Well it can all be ditched! Basically the ECU controls when and where to shift based on all sorts of inputs including lever demand in tip mode. Well in a racecar with a competent person at the helm you dont need some fancy box of electronics to decide if you really meant to change gear when you said you wanted to, you just want it to do it! Also full AUTO mode is not required so all that fuzzl logic learn your driving style crap can be junked. All it does is switch power to 3 or 4 solenoids which determine which gear to select in the box. From my understanding once you know the pinouts of the solenoids its a simple matter of feeding them with a voltage in a particular sequence to go up and down the gears.
For a Toyota 4 speed the state of the solenoids is as follows (only 2 solenoids here)
1st gear, Solenoid 1 on, Solenoid 2 off
2nd gear, Solenoid 1 on, Solenoid 2 on
3rd gear, Solenoid 1 off, Solenoid 2 on
4th gear, Solenoid 1 off, Solenoid 2 off
Simple! £5 worth of electronics from Maplin will do this! :-b
All I need now is 2 AUTO boxes! Well I have sourced one :lipsrseal but it is a 4WD unit so once I have my hands on it I will investigat the possibility of making it 2WD. Shouldn't be too hard its just a case of mating a driveshaft the the point where the transfer box take off is. If all else fails a couple of transfer boxes will be needed and the rearward locked off. Obviously 2WD ones would be more suited, but I am concerned about power handling! I know of at least 2 4WD gearboxes that have held 450BHP! Thats 900BHP potential, or 10second 1/4 miles first time out........
So whaddya think? Mad or just barking?
WHY? I hear you shout! Well manuals require clutches and these tend to be very expensive, also zentac fried one in short time, Zedy1 says his brand new one is slipping on only slightly increased power. Also fabricating a mechanism to ensure both boxes change using 1 clutch and 1 gear lever will be tricky (not impossible though!). As for selecting 1st with one engine/gearbox and R for the other would be a total nightmare.
So I have done some research and the answer is 2 INVECSII AUTOS. :D But hat about all that nasty wiring? Well it can all be ditched! Basically the ECU controls when and where to shift based on all sorts of inputs including lever demand in tip mode. Well in a racecar with a competent person at the helm you dont need some fancy box of electronics to decide if you really meant to change gear when you said you wanted to, you just want it to do it! Also full AUTO mode is not required so all that fuzzl logic learn your driving style crap can be junked. All it does is switch power to 3 or 4 solenoids which determine which gear to select in the box. From my understanding once you know the pinouts of the solenoids its a simple matter of feeding them with a voltage in a particular sequence to go up and down the gears.
For a Toyota 4 speed the state of the solenoids is as follows (only 2 solenoids here)
1st gear, Solenoid 1 on, Solenoid 2 off
2nd gear, Solenoid 1 on, Solenoid 2 on
3rd gear, Solenoid 1 off, Solenoid 2 on
4th gear, Solenoid 1 off, Solenoid 2 off
Simple! £5 worth of electronics from Maplin will do this! :-b
All I need now is 2 AUTO boxes! Well I have sourced one :lipsrseal but it is a 4WD unit so once I have my hands on it I will investigat the possibility of making it 2WD. Shouldn't be too hard its just a case of mating a driveshaft the the point where the transfer box take off is. If all else fails a couple of transfer boxes will be needed and the rearward locked off. Obviously 2WD ones would be more suited, but I am concerned about power handling! I know of at least 2 4WD gearboxes that have held 450BHP! Thats 900BHP potential, or 10second 1/4 miles first time out........
So whaddya think? Mad or just barking?