The 3.4L TRD Supercharger Thread

[4RunnerNoobinNC]

[MENTION=139000]phattyduck[/MENTION] did you splice the factory harness or did you use a patch harness?

 

[phattyduck]

[MENTION=139000]phattyduck[/MENTION] did you splice the factory harness or did you use a patch harness?

I spliced the factory harness. I did use a Deutsch connector (well, a few) to allow the harness to be removed like factory. I also made a 'bypass' plug for the 7th injector controller harness that allows the engine to run 100% stock in case something goes wrong with the 7th controller out in the woods.

-Charlie

 

[4RunnerNoobinNC]

I spliced the factory harness. I did use a Deutsch connector (well, a few) to allow the harness to be removed like factory. I also made a 'bypass' plug for the 7th injector controller harness that allows the engine to run 100% stock in case something goes wrong with the 7th controller out in the woods.

-Charlie

Do you have any pics of how you did it?

 

[phattyduck]

Do you have any pics of how you did it?

Looks like I didn't take any... But the 'bypass' plug just reconnects the two wires that are spliced so the 7th controller can retard timing (cam and crank signals). The rest of the wires are taps (power, ground, AFR/O2) or outputs (injector).

-Charlie

 

[mizak82]

Does anyone have a working link or a diagram of the template to cut the timing belt cover to clear for the supercharger?

 

[ajh75]

Supercharger Injectors

Hello, new here and not sure if I should make a new thread or post here, but I’m currently in the process of installing a SC on my 01 4Runner and want to make sure I do some preventative maintenance to keep my engine running well. I’m looking for injectors for my engine that are 300ish cc’s and are OEM, preferably part number 23250-46050 from the 2JZ non-vvti. Does anyone know a reputable source to buy some from, or have any that I can purchase? If not these injectors, does anyone know where I can find 300-310cc injectors for my 5VZFE that are plug and play? Thanks!

 

[phattyduck]

Hello, new here and not sure if I should make a new thread or post here, but I’m currently in the process of installing a SC on my 01 4Runner and want to make sure I do some preventative maintenance to keep my engine running well. I’m looking for injectors for my engine that are 300ish cc’s and are OEM, preferably part number 23250-46050 from the 2JZ non-vvti. Does anyone know a reputable source to buy some from, or have any that I can purchase? If not these injectors, does anyone know where I can find 300-310cc injectors for my 5VZFE that are plug and play? Thanks!

Just a moment...

Though, make sure this is really what you want to do. If you have a good tuning solution, its fine - but may not be the best option if you are using the stock ECU. Motorwest is a good source for stock flow but newer injectors (used on newer Toyotas) too.

-Charlie

 

[ajh75]

Thank you! I’ve seen these and I’ve also seen some others that are aftermarket, just wasn’t sure if they were reliable or not. I’m looking to do a mild SC build getting only about 6-7 PSI more with as close to stock I can. I know that the 7th injector from URD is a popular rout, but it’s just way too out of my price range, and I’ve seen people run stock ECU with slightly higher flow plugs and a larger fuel pump.

 

[phattyduck]

Thank you! I’ve seen these and I’ve also seen some others that are aftermarket, just wasn’t sure if they were reliable or not. I’m looking to do a mild SC build getting only about 6-7 PSI more with as close to stock I can. I know that the 7th injector from URD is a popular rout, but it’s just way too out of my price range, and I’ve seen people run stock ECU with slightly higher flow plugs and a larger fuel pump.

6-7 PSI on the gen1/2 supercharger shouldn't need a ton of fuel work, probably a RRFPR would get you there, with just a lot of power left on the table. 6-7 PSI on the new TVS1320-based supercharger NEEDs a quality tuning solution. I stepped back down to 5.5-6 PSI for safety, though it is fun up at 7 PSI...

Expect slightly wonky fuel trims with the vacuum referenced stock FPR (ECU will have to add fuel in high vacuum due to lower fuel pressure), which helps the supercharger at stock boost levels be better fueled under boost.

-Charlie

 

[ajh75]

Ah, ok. I’m getting a used gen 2 SC (black one with TRD on top). What is an RRFPR? I’m going for a mild build that has reliability in mind, nothing crazy like a smaller pulley or giant injectors or 7th injector. Also planning on installing a wideband and a boost gauge to monitor everything, but I’m running denso IK22 5310’s, new PCV valve, new radiator (one on my rig is original from 2001), new fan clutch, brand new coolant, new ATF, new TB to SC gasket, new plenum to SC gasket, and brand new SC oil. The used kit I’m buying has the original TRD stainless headers as well as a free meth injection kit from old owner than I’m planning on installing at a later time. As far as injectors and fuel pump goes, is upgrading them slightly a good idea or is it just overkill for the build I’m going for? I’ve heard that running 295-310cc injectors and upgrading fuel pump to 190 or 255LPH will make the engine run slightly too rich until ECU can adjust, and I’m just worried that stock pump and injectors will run me too lean and cause lean codes or pinging. Thoughts?

 

[phattyduck]

Ah, ok. I’m getting a used gen 2 SC (black one with TRD on top). What is an RRFPR? I’m going for a mild build that has reliability in mind, nothing crazy like a smaller pulley or giant injectors or 7th injector. Also planning on installing a wideband and a boost gauge to monitor everything, but I’m running denso IK22 5310’s, new PCV valve, new radiator (one on my rig is original from 2001), new fan clutch, brand new coolant, new ATF, new TB to SC gasket, new plenum to SC gasket, and brand new SC oil. The used kit I’m buying has the original TRD stainless headers as well as a free meth injection kit from old owner than I’m planning on installing at a later time. As far as injectors and fuel pump goes, is upgrading them slightly a good idea or is it just overkill for the build I’m going for? I’ve heard that running 295-310cc injectors and upgrading fuel pump to 190 or 255LPH will make the engine run slightly too rich until ECU can adjust, and I’m just worried that stock pump and injectors will run me too lean and cause lean codes or pinging. Thoughts?

RRFPR = Rising Rate Fuel Pressure Regulator. Basically, an 'extra' regulator that boosts fuel pressure at a >1:1 ratio above atmospheric pressure.

I wouldn't call the 7th injector overkill. The modern setup from URD also pulls timing in a few key locations to avoid ping (especially boosting below 3k rpm where the stock ECU ignores the knock sensor). It also allows the ECU to be driving stock injectors so the ECU doesn't have much to compensate for under light loads. Depending on year (O2 sensor vs. AFR), it also can run the engine a bit richer even during closed-loop operation via O2 or AFR sensor skewing - so the ECU doesn't compensate away extra fuel under low boost situations.

You WILL need an upgraded fuel pump. The stock pump is just barely adequate for the stock engine, though it is very reliable on a stock engine. With boost, it will run out of flow, even with the PSI/power you will be running.

Larger injectors with no other fueling mods doesn't seem like it will help. The stock ECU will learn that it needs to pull say, 20% fuel everywhere... Then it will just pull 20% fuel out everywhere. It would give you headroom of if you then had a piggyback to add fuel back (piggyback controlling injectors) in certain locations... but again, the ECU will fight it if it is in closed loop.

Just take this in stages. Get all the base work done - maintenance, etc. and supercharger with stock pulley installed... then go from there.

-Charlie

 

[ajh75]

Makes sense. A lot of the terms you mentioned I’m not super familiar with, so I apologize for the foolishness. If I’m understanding correctly, for now I should do maintenance and use stock pump and injectors and add the SC with stock pulley, and from there do further upgrades. Thank you for the replies and information.

 

[ajh75]

RRFPR = Rising Rate Fuel Pressure Regulator. Basically, an 'extra' regulator that boosts fuel pressure at a >1:1 ratio above atmospheric pressure.

I wouldn't call the 7th injector overkill. The modern setup from URD also pulls timing in a few key locations to avoid ping (especially boosting below 3k rpm where the stock ECU ignores the knock sensor). It also allows the ECU to be driving stock injectors so the ECU doesn't have much to compensate for under light loads. Depending on year (O2 sensor vs. AFR), it also can run the engine a bit richer even during closed-loop operation via O2 or AFR sensor skewing - so the ECU doesn't compensate away extra fuel under low boost situations.

You WILL need an upgraded fuel pump. The stock pump is just barely adequate for the stock engine, though it is very reliable on a stock engine. With boost, it will run out of flow, even with the PSI/power you will be running.

Larger injectors with no other fueling mods doesn't seem like it will help. The stock ECU will learn that it needs to pull say, 20% fuel everywhere... Then it will just pull 20% fuel out everywhere. It would give you headroom of if you then had a piggyback to add fuel back (piggyback controlling injectors) in certain locations... but again, the ECU will fight it if it is in closed loop.

Just take this in stages. Get all the base work done - maintenance, etc. and supercharger with stock pulley installed... then go from there.

-Charlie

Just seeing more info about the things you recommended as well. Now understanding more of it than before. I think what you were saying is that the stock injectors should be fine for now, but that I need to definitely upgrade the fuel pump (bigger straw = more potential liquid), and that if I upgrade injectors without a tune the ECU just self reprograms timing, and stock injectors would be the better route for now. The MAF, A/F, and O2 sensors will read the extra air being pumped from the supercharger, and will tell the ECU to supply more fuel, but if the pump isn’t upgraded it will just run lean and won’t be able to supply the required fuel. I believe this is what you told me and I just didn’t understand at the time. Please correct me if I’m wrong. I can definitely do the 7th injector at a later time but I just don’t have the budget for it right now. Is upgrading the fuel pump and running IK22 5310’s, 93 octane, and all of the other maintenance stuff I listed before a “good enough” solution to keep reliability while also increasing power? I know I have a ton of power left on the table with the 7th injector and smaller pulley, but for now wanting to keep it mild and safe until I can afford all of that. Sorry for the long post/question. Thanks Charlie!

 

[phattyduck]

Just seeing more info about the things you recommended as well. Now understanding more of it than before. I think what you were saying is that the stock injectors should be fine for now, but that I need to definitely upgrade the fuel pump (bigger straw = more potential liquid), and that if I upgrade injectors without a tune the ECU just self reprograms timing, and stock injectors would be the better route for now. The MAF, A/F, and O2 sensors will read the extra air being pumped from the supercharger, and will tell the ECU to supply more fuel, but if the pump isn’t upgraded it will just run lean and won’t be able to supply the required fuel. I believe this is what you told me and I just didn’t understand at the time. Please correct me if I’m wrong. I can definitely do the 7th injector at a later time but I just don’t have the budget for it right now. Is upgrading the fuel pump and running IK22 5310’s, 93 octane, and all of the other maintenance stuff I listed before a “good enough” solution to keep reliability while also increasing power? I know I have a ton of power left on the table with the 7th injector and smaller pulley, but for now wanting to keep it mild and safe until I can afford all of that. Sorry for the long post/question. Thanks Charlie!

Yes, that all sounds right. The ECU reads the increased airflow via the MAF, so fueling will be 'correct' (ish). If you don't have a tuning solution, don't go above the stock pulley.

The higher flow pump is needed since it needs to supply more fuel AND more pressure due to the supercharger - the pressure goes up since it is pushing against the boost (boost referencing the stock FPR), and at the same time the engine needs more fuel due to higher airflow.

-Charlie