Toymods Car Club Inc: Tech & Conversions => MA70 -> JZA70 Conversion

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Lambolica
Forums Junkie

Location:
Northwestern Sydney
Registered:
August 2002

MA70 -> JZA70 Conversion	Tue, 26 April 2005 01:27

This will be a trial run to get information on what people want to know to do this conversion as we are documenting and photographing the conversion to hopefully create a FAQ Article for future reference. This all started after the 7M-GTE in my brothers MA70 GT Limited Blew the headgasket and after some quotes about rebuilding the 7M and running the numbers on a 1JZ-GTE conversion, in OURCase the 1JZ conversion came up trumps. The aim of this conversion is to get the car on the road as soon as possible and running reliably, there would/could/should be other things that we could have done during the conversion however once again in our case we deamed them un-necesary at this point in time. Recipient car:- MA70 GT Limited, Auto, Aero top, Digital Dash. Doner Car:- JZA-70 Manual (R154)1/2 cut (appears to be a base spec model - No ABS, Analog Dash, fewer power options) Purchaced from CVAP (forum sponser) Andrew did a really good job of getting the engine up to Sydney for the long weekend. The engine payment was confirmed Monday morning, the engine was delivered to Melbourne Depot Tuesday, arrived in Sydney Wed morning by 9am, in the garage by Thursday. Andrew also threw in the JZ tailshaft (just in case) plus the exhaust system that origonally came with the car. Pleasure to deal with and Highly recommend him for anything you may need that he deals in. My brother Matt (Maphril) is relativly new to the modifying car scene and is generally of the opinion if it is broken send it back to Toyota to get it fixed which is all well and good but isn't in the spirit of modifying, but he is very cluey and currently works as a electronics Technician which was an advantage. My experience in engine swaps is pretty basic (18R-C - 18R-G - 18R-GEU (several times now)) and I looked at this conversion as mearly a step up with more wires hanging off the engine, more accesories hanging off the engine and more gear on the cross member. ie more bolts to strip the heads on In general terms we are not Mechanics by trade and Haven't tackled anything like this previously. The Conversion:- Friday Night:- Prep work. We spent friday night getting the cars into position in the garage up on ramps, stands, jacks and pulled the piping off the top of the engine bay of the JZ cut and photographed the vacuum piping and general layout of PS, A/C, intercooler piping for future reference. Pulled the glove box out to get to the computer and pulled the engine loom through the firewall. Saturday:- Pulling out the 1J! Saturday I went about pulling off all power steering, A/C fuel, and wiring that connected the engine to the car, leaving the plugs connected to the sensors for ease of re-connection, in fact we even left the power steering fluid bottle as part of the engine package. we decided that we would leave all pipes comning out of the engine connected to the engine rather than swapping it in the engine bays later. it was also found that the intercooler on the JZ is much larger than the MA and the JZ only had a hydraulic fan where as the MA had the engine fan + an electric thermo fan + 2 small thermo fans. It appears the 2 small thermos were for the Oil cooler that the MA had which the JZ didn't have. In the spirit of getting the MA bay looking like the JZ bay all the fans were removed from the MA (however we will try to relocate the Big thermo later. Whilst I was messing up a perfectly good engine bay Matt was pulling the Interior of the Cut appart to get the pedals and clutch cyl. accel cables and pulling out the gear shifter. (auto - man conversion as well) and pulled the interior out of his car to prepare to install it in. Engine was removed from the cut at about 10pm Saturday night. Sunday:- Pulling the BHG 7M. + wiring Sunday was the same for me as Sat pulling off all engine connections and removing the radiator, intercooler etc. 7M was removed from the engine bay at 6pm. Matt spent the day cutting the Plugs off the 7M loom and cut and shutting them to the 1J loom for all the plugs that feed information to the interior in terms of A/C controls and Dash information with the help of diagrams lifted from the internet. He finished the main loom about the same time I had the engine ready to be pulled out. The rest of the night was spent comparing empty engine bays and swapping basic stuff over (clutch lines, Accel cables etc) beer and lack off sleep prevented any further productive work. Monday ANZAC day P/H:- Cross member Mayhem Matt spent most of the day putting his interior back together, now improved with 3 pedals and clutch cylinder! without incident. I spent the morning pulling out the crossmember (brakes and all) from the cut after some measurements confirming that the crossmembers were in fact different enough to require them to be changed. (bugger) the brakes from Matts car are to be swapped onto the JZ member as well as some of the PS stuff which was overhauled recently. Time constraints left the project with the JZ crossmember on the floor in front of the MA waiting to drop the MA member. Looking in the empty bays all of the A/C lines are identical between the MA and the JZA. the PS lines are similar even thought the filler bottles are on opposite sides of the bay (return lines run under the engine itself) there is a difference in the cooling lines between the two bays further investigation will show if the exrta cooling setup is for the hydraulic fan and the PS cooling lines are the same or if there is a diiference there and require swapping before the intercooler is replaced. was also found that the bonnet release support bracket had to be swapped to fit the 1J intercooler as the MA was smaller and slightly thinner. To be done: the MA crossmember is to be dropped next weekend and swapping of PS rack bushes etc will occur on the floor before being lifted into position where the brakes will be hooked up again and PS lines bolted back in. engine lowered in and reconnected. Drive shaft connected. Exhaust connected. wiring loom run back through fire wall. there are some differences between the wiring for the fuse box in the engine bay but this seems to be to do with the alternater being on the other side of the 1J comapred to the 7M. Matt will be chasing wires and will extend the loom in that area to reconnect the Alt neatly as there are more wires in the MA due to the extra options (fog lighs, Fans, ABS) that the front cut didn't have so we are trying to retain the MA loom in that area and add to it the 1J specific wiring. then hopefully (after oil change, fluid change and bleed and some new hoses to replace older looking ones) it will be turn key and brooooom!!! To be updated as work is done but please feel free to ask anything that might be useful for people who want to do this in the future as I want to cover as many issues as possible before this is offically written up and submitted for a Tech Article. Photos, wiring conversion 7M loom -> 1J loom diagrams to follow. Cheers Simon [Report message to a moderator]

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