GTE swap rebuild thread into SC300
#156
Lead Lap
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#159
Lead Lap
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Not yet. The fuel pump is actually the only thing left to do. It idle's great with the stock SC pump. I'm going to put the Denso TT in this weekend. I'm just not sure yet if I want to do the 12V mod or keep the ECU hooked in the loop. Everyone has a different opinion on this. I like having the off/kill still functional with the stock ECU. Takes me forever to figure out how I want to do stuff when there are options.
#160
Lead Lap
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Not yet. The fuel pump is actually the only thing left to do. It idle's great with the stock SC pump. I'm going to put the Denso TT in this weekend. I'm just not sure yet if I want to do the 12V mod or keep the ECU hooked in the loop. Everyone has a different opinion on this. I like having the off/kill still functional with the stock ECU. Takes me forever to figure out how I want to do stuff when there are options.
![](http://i19.photobucket.com/albums/b188/dejacky/FuelPumpwiring.jpg)
Last edited by ICONYQ; 07-31-09 at 09:39 AM.
#161
Lead Lap
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Zmegoby-Thanks man. Your inputs are always great.
Is that diagram with the 12V mod, or still with all the FuelECU connections still functional (and using a direct line from the batt to ensure good voltage)? I did this whole swap and wiring crap still freaks me out.
Also, does heat shrink tubing stand up to gasoline immersion?
Is that diagram with the 12V mod, or still with all the FuelECU connections still functional (and using a direct line from the batt to ensure good voltage)? I did this whole swap and wiring crap still freaks me out.
Also, does heat shrink tubing stand up to gasoline immersion?
#162
Lead Lap
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Zmegoby-Thanks man. Your inputs are always great.
Is that diagram with the 12V mod, or still with all the FuelECU connections still functional (and using a direct line from the batt to ensure good voltage)? I did this whole swap and wiring crap still freaks me out.
Also, does heat shrink tubing stand up to gasoline immersion?
Is that diagram with the 12V mod, or still with all the FuelECU connections still functional (and using a direct line from the batt to ensure good voltage)? I did this whole swap and wiring crap still freaks me out.
Also, does heat shrink tubing stand up to gasoline immersion?
This will bypass the FuelECU. However what it will do is take the signal that tells the fuel ECU to turn on (12v) and tell your relay to turn on and pump.
I get what you are saying about playing with the wiring...xcply in the fuel. Still is not a fun thought even after I did it but I think that concern made me make sure that everything was solid back there.
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BTW 8guage is overkill. You can use 10 or 12 IMO.
#163
Lead Lap
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Interesting thread over at supraforums. Shows part numbers for fuel pump and it looks like the JDM Turbo and N/A Supra have the same pump. I can only assume the N/A Supra and SC300 have the same pump. Does that mean I can use my current pump until without concern (conservative driving) until I get the wiring all nailed down. Seems silly since I have a TT Denso just in waiting, but I want to make sure it's done right. This is my daily driver and I need to get to work and back. Part no's below. Makes a little sense seeing as how the Aristo injectors are only 440cc.
23221-46070 - JDM N/A / Turbo, USDM N/A
23221-46100 - Euro N/A
23221-46110 - USDM Turbo, Euro Turbo
23221-46070 - JDM N/A / Turbo, USDM N/A
23221-46100 - Euro N/A
23221-46110 - USDM Turbo, Euro Turbo
#164
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Slappy,
For the record, I'm also doing a swap - 1998 sc300 with a JDM Aristo 2jzgte. It's a non VVTI 2jzgte.
The swap package comes with the Walboro 255 fuel pump and I will install that fuel pump with the 12V mod. I was told to do that by the seller, since the upgraded fuel pump must use higher voltage.
Thus, if you install the Denso fuel pump, you may have to supply more voltage to the pump.
Here is the concept and principles I've gathered, thus far, about the 12V mod:
http://www.mkiv.com/techarticles/12v_mod/12v_mod.htm
Lastly, the 12V mod still allows for all the functionality the fuel pump ecu inherently has, besides the voltage toggling. I believe, with the 12V mod, you are NOT bypassing the fuel pump ecu, rather the 9v to 12v toggling functionality for the device. Notice the fact you must reconnect the plug back into the fuel pump ecu after the wire splice and join.
Please, if I've misspoken or have given any wrong info, someone please chime in.
thx
For the record, I'm also doing a swap - 1998 sc300 with a JDM Aristo 2jzgte. It's a non VVTI 2jzgte.
The swap package comes with the Walboro 255 fuel pump and I will install that fuel pump with the 12V mod. I was told to do that by the seller, since the upgraded fuel pump must use higher voltage.
Thus, if you install the Denso fuel pump, you may have to supply more voltage to the pump.
Here is the concept and principles I've gathered, thus far, about the 12V mod:
http://www.mkiv.com/techarticles/12v_mod/12v_mod.htm
Lastly, the 12V mod still allows for all the functionality the fuel pump ecu inherently has, besides the voltage toggling. I believe, with the 12V mod, you are NOT bypassing the fuel pump ecu, rather the 9v to 12v toggling functionality for the device. Notice the fact you must reconnect the plug back into the fuel pump ecu after the wire splice and join.
Please, if I've misspoken or have given any wrong info, someone please chime in.
thx
Last edited by howat; 08-01-09 at 02:02 PM.