hp006 Posted May 11, 2007 Share Posted May 11, 2007 The engine has been swapped from a N/A to a tt. I have been advised that the gearbox will not work properly as i do not have ABS. It wont know what gear to be in. The gearbox uses a sensor from the abs to decide what gear the car should be in, what are peoples suggestions??????? Do i need to fit abs or can can it be tricked with just the ecu???? They also said that the car may drive but then the rear wheels will lock up what are peoples suggestions????? What have other people done to solve this??? Also 27 wires need joing under the passenger side of the dash to help trick the gearbox, is this true and if so how easy is it. I have not tried driving the car as i dont want to cause damage to the car or kill myself with the rear wheels locking but the engine does run fine. Thanks for any help. Link to comment Share on other sites More sharing options...
dini_the_owl Posted May 11, 2007 Share Posted May 11, 2007 Not sure with auto buddy but with manual its quite an easy task,i cant see why the wheels would be locking up though unless there is a problem with the box or diff? Link to comment Share on other sites More sharing options...
hp006 Posted May 11, 2007 Author Share Posted May 11, 2007 I have not tried it is something that i have been told by Turbofit and he seems like avery helpful guy, im just not sure how much needs doing as other people i have spoken to have just done the swap and had no problems whatsoever. The gearbox needs a sensor to make it choose the right gear apparently otherwise it will jump all over the place. Really not sure what to make of all of it.... Link to comment Share on other sites More sharing options...
dini_the_owl Posted May 11, 2007 Share Posted May 11, 2007 yeah they are, not heard of that before though but i would do some research before driving the thing.. p.s was your n/a an auto or man Link to comment Share on other sites More sharing options...
absz Posted May 11, 2007 Share Posted May 11, 2007 i'm sure that the speed sensor talks to the ecu direct ? in which case it will not effect your gearbox gear change. might be wrong thou:rolleyes: Link to comment Share on other sites More sharing options...
JustGav Posted May 11, 2007 Share Posted May 11, 2007 I'm a little confused here... the ABS system doesn't have a direct link to the gearbox. I personally have fitted a VVTi engine which had ABS and I didn't have the ABS hub rings, so I don't have ABS (Get the warning light), and also my traction control doesn't work (ie once you start moving it slows the car due to not getting a movement signal), however once the traction control is disabled it runs just fine. Link to comment Share on other sites More sharing options...
hp006 Posted May 11, 2007 Author Share Posted May 11, 2007 The guy at turbofit said that i need abs as the gearbox has a sensor which enables the car to decide what gear should be used??? And also i need to join 27 wires together to stop the gearbox from locking??? Link to comment Share on other sites More sharing options...
dini_the_owl Posted May 11, 2007 Share Posted May 11, 2007 Sounds like it could be possible,heres some info on auto sensors A Transmission Control Unit is a device that controls modern electronic automatic transmissions. A Transmission Control Unit generally uses sensors from the vehicle as well as data provided by the Engine Control Unit to calculate how and when to change gears in the vehicle for optimum performance, fuel economy and shift quality. Electronic automatic transmissions have been shifting from purely hydromechanical controls to electronic controls since the late 1980’s. Since then, development has been iterative and today designs exist from several stages of electronic automatic transmission control development. Transmission Solenoids are a key component to these control units. The evolution of the modern automatic transmission and the integration of electronic controls have allowed great progress in recent years. The modern automatic transmission is now able to achieve better fuel economy, reduced engine emissions, greater shift system reliability, improved shift feel, improved shift speed and improved vehicle handling. The immense range of programmability offered by a Transmission Control Unit allows the modern automatic transmission to be used with appropriate transmission characteristics for each application. Input Parameters The typical modern Transmission Control Unit uses signals from engine sensors, automatic transmission sensors and from other electronic controllers to determine when and how to shift. Vehicle Speed Sensor (VSS) This may also be known as an output speed sensor (OSS). This sensor sends a varying frequency signal to the Transmission Control Unit to determine the current shaft speed of the output shaft or differential in a typical vehicle. The Transmission Control Unit uses tire size, gear ratios and final drive ratio to calculate the current vehicle speed. Turbine Speed Sensor (TSS) This may also be known as an input speed sensor (ISS). This sensor sends a varying frequency signal to the Transmission Control Unit to determine the current shaft speed of the input shaft or torque converter. The Transmission Control Unit uses this shaft speed to determine slippage across the torque converter and potentially to determine the rate of slippage across the bands and clutches. Transmission Fluid Temperature (TFT) This may also be known as Transmission Oil Temperature (TOT). This sensor determines the fluid temperature inside the transmission. This allows the Transmission Control Unit to modify the line pressure and solenoid pressures according to the changing viscosity of the fluid based on temperature. This can provide for more appropriate shifing in extreme temperatures and allow for temperature failsafe systems to take control. Output Parameters The typical modern Transmission Control Unit sends out signals to shift solenoids, pressure control solenoids, torque converter lockup solenoids and to other electronic controllers. Shift Solenoid Modern electronic automatic transmission have electrical solenoids which are activated to change gears. These solenoids range from very simplistic control in older automatic transmission designs to extremely complicated in very new automatic transmission designs. The way in which the solenoid is activated and when it is activated is chosen by the manufacturer of the transmission and can vary greatly from vehicle to vehicle. Pressure Control Solenoid Modern electronic automatic transmissions are still fundamentally hydraulic. This requires precise pressure control. Older automatic transmission designs may only use a single line pressure control solenoid which modifies pressure across the entire transmission. Newer automatic transmission designs often use many pressure control solenoids and sometimes allow the shift solenoids themselves to provide precise pressure control during shifts by ramping the solenoid on and off. The shift pressure affects the shift harness and shift speed. Torque Converter Clutch Solenoid (TCC) Most electronic automatic transmissions utilize a TCC solenoid to lock the torque converter electronically. Once locked, the torque converter no longer applies torque multiplication and will spin at the same speed as the engine (assuming the converter is fully locked). This provides a major increase in fuel economy and modern designs attempt to provide partial lockup in lower gears to improve fuel economy further. Link to comment Share on other sites More sharing options...
absz Posted May 11, 2007 Share Posted May 11, 2007 maybe they were talking about traction control !!! as without this your gear changes will be harsh. Link to comment Share on other sites More sharing options...
Ian C Posted May 11, 2007 Share Posted May 11, 2007 The autobox ECU needs a vehicle speed sensor input, yes, but that vehicle speed sensor is on... your gearbox. It also knows what revs you are at and what your throttle position is and also was a moment ago etc etc but one thing it doesn't do is use the ABS sensors. -Ian Link to comment Share on other sites More sharing options...
Jezz Posted May 12, 2007 Share Posted May 12, 2007 The guy at turbofit said that i need abs as the gearbox has a sensor which enables the car to decide what gear should be used??? And also i need to join 27 wires together to stop the gearbox from locking??? Not dissing turbofit in any way here, but take that advice with a pinch of salt. I saw first hand the mess that cars loom was in, and i'm guessing thats what lead to the problems with the box locking in 3rd gear. Yes, Greg had problems with an NA - TT conversion, but the 3 people that have done the SAME conversion themselves havent encountered this problem. Jim-supra is a good guy to ask questions, he fitted his TT auto conversion on his drive and was done and driving perfect in 2 days. Link to comment Share on other sites More sharing options...
hp006 Posted May 13, 2007 Author Share Posted May 13, 2007 Just to update everyone. I was towing the car and Greg from Turbofit was right, the car was locking up in the gears. It would not go back down. So it is being booked in for them to hopefully finish the job in June. Link to comment Share on other sites More sharing options...
Soonto_HAS_soop Posted May 13, 2007 Share Posted May 13, 2007 How long did you tow the car for, as that will fcuk the auto gearbox. Link to comment Share on other sites More sharing options...
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