The 3.4L TRD Supercharger Thread

[dunktap]

Trouble is I already removed both old rear needle bearings, so there wasn't a good way to make sure the new ones were pressed into the correct depth.

Probably gonna send off my pile o' parts to Embree for reassembly.

Yeah I did the same thing and attempted to press some new ones in and failed. I ordered some new bearings and gave them along with the sc to the shop and they took care of it. 17k miles no issues.

Sent from my Nexus 6P using Tapatalk

 

[denvermaxd]

Arrgh... discontinued IAC check valve

I just picked up a used TRD Supercharger, very excited to get it installed and making sure I have everything (my truck is 2000 4Runner SR5, 5-speed manual, 3.4).

Discovered I don't have the IAC check valve.

Started hunting down parts, found this is Toyota Part No.: 00602-17620-065.

Turns out it's discontinued! Can't get one anywhere I've looked.

Any ideas on substitution? I ordered 90917-10065 because it's a one-way check valve, but it's impossible to tell if it's the right size. In my Audi there are check valves all over the damn place, and they're almost all the same, but not sure about 4Runners/Toyota.

 

[hawaiianeyz]

Throttle body cable bracket and dipstick relocation bracket

Hey guys, I just bought a 2nd gen SC. It came off a Tacoma so the throttle body cable bracket that's currently on it doesn't work for my 1999 4Runner (I need the bracket with the two vertical prongs that are offset). It also didn't come with the dipstick relocation bracket... I know it's a shot in the dark, but do any of you have an extra TB cable bracket and a dipstick relocation bracket laying around? I've read that a few of you have fabricated brackets, how did you guys fab these brackets? Any help would be much appreciated!!

 

[bugman-74]

so there wasn't a good way to make sure the new ones were pressed into the correct depth.

For what its worth, I measured mine (2nd/4th gen black): They were .070" below flush.

 

[bugman-74]

Discovered I don't have the IAC check valve. Can't get one anywhere I've looked.

This is the solution

For visibility and awareness, here it is again: PTR29-60031

Still available and costs about $8. I run this one on my TRD SC'd 5-speed.

They dont mark the flow direction on this check valve, but its easy to figure out (blow into it). Orient such that air can flow from FROM the throttle body TO the engine.

 

[denvermaxd]

Compression test results prior to SC install... not good?

Just finished doing compression check on my truck. My new (used) TRD Supercharger is sitting on the living room floor.

Truck: 2000 T4R SR5 5-speed manual, 3.4L, 188,616 miles. Runs strong, doesn't burn oil.

Compression:

#6 165 psi
#4 151 psi
#2 150 psi
#5 172 psi
#3 160 psi
#1 172 psi

#4 & #2 are down close to the "minimum" called out in my Haynes manual.

Is this an engine I can install a Supercharger on? ray:

 

[bugman-74]

Your numbers seem low... Ideally they should be 174 psi or higher. Minimum is 145 psi. Should be less than 15 psi delta between cylinders.

Describe your test process. Were you holding the throttle wide open during cranking? Was the battery low on juice? Did a drop of oil down the spark plug hole significantly increase your #'s?

 

[denvermaxd]

Throttle was wide open. Engine warm. Battery charger plugged in. Haven't done the oil drop test.

 

[Gravity_Knight]

Throttle was wide open. Engine warm. Battery charger plugged in. Haven't done the oil drop test.

High elevation will produce a little lower numbers.. but the difference between cylinders is what's most important anyway.

Leak down testers are superior to a regular compression tester. They are not real expensive (50-70ish) on Amazon and such. Just a thought, but it will tell you more about what is or isn't going on.

 

[denvermaxd]

High elevation will produce a little lower numbers.. but the difference between cylinders is what's most important anyway.

This got me curious, so I researched it a bit, and it seems like the impact of altitude is pretty dramatic. Here's a formula I found in several places online:

Compression Test Altitude Compensation Factors
Altitude Factor
500 0.987
1500 0.960
2500 0.933
3500 0.907
4500 0.880
5500 0.853
6500 0.826
7500 0.800
8500 0.773

That means for me, at 5,300 ft, adjusted numbers:

#6 193 psi
#4 177 psi
#2 175 psi
#5 201 psi
#3 187 psi
#1 201 psi

Still concerned about the variability in #4 & #2 compared to the other cylinders, but the readings are not nearly as low once you compensate for altitude. Surprised how much altitude moved those compression numbers up.

I've scheduled a leak-down test for Monday at a reputable local independent Toyota mechanic. He seemed surprised I would want a leak-down test when there is not observable performance issue. He said, ostensibly, if there was a serious leak issue there would be some evidence in how the truck is running. I'm confused by this, as well. The plugs all look great, virtually indistinguishable from one another. Truck drives great. Engine sounds good (no valve chatter or rough idle or anything). Here are the plugs:

Those are arranged as the are installed in the vehicle, right being front of the engine. So, clockwise from top left 6,4,2,1,3,5.

 

[Manic]

Anyone know where I can find out more information about the TRD vacuum regulator? One of the used 1st gen SC's I bought came with it.

Any ideas how to test if it's still viable? If it's bad, worth rebuilding?

Where should I tap into for my mechanical fuel pressure gauge?

Sorry [MENTION=99443]dunktap[/MENTION] for breaking up your convo.

 

[Jahmiroquai]

Can't help with testing, but since my sc is off, here's how its mounted & plumbed

 

[Co4Fun]

SC Miles

Curious who has gone the longest SC'd.

I'm new to this SC business but my rig came with one...second generation (black) TRD. I'm learning. I like the extra power for sure as long as it's not at the expense of any serious engine longevity. My rig has about 130k on it but SC was put on at 93k (I verified with the dealer). So it hasn't had it the entire life of the engine. I saw one locally that was SC'd with 230k on it.

 

[Rockdawg84]

my supercharger was dealer installed in 98 and I rebuilt it and the motor at 169K. If that helps :biggrin2:

 

[shootmymime]

Curious who has gone the longest SC'd.

I'm new to this SC business but my rig came with one...second generation (black) TRD. I'm learning. I like the extra power for sure as long as it's not at the expense of any serious engine longevity. My rig has about 130k on it but SC was put on at 93k (I verified with the dealer). So it hasn't had it the entire life of the engine. I saw one locally that was SC'd with 230k on it.

I bought my SC used, said to have like 50K miles on it. my truck had 200,000 miles on it when i installed the super charger. i now have 228,000. i have a 2.2 pulley and 7th injector and run the snot out of it at times pulling a trailer and cross country. it runs great.

 

[Manic]

Can't help with testing, but since my sc is off, here's how its mounted & plumbed

What injectors are those?

Thanks for the pic, can you please take one of the lines coming in and out of the side? I'm guessing the bottom is the return, just want to double check. What hose clamps are you using?

 

[Jahmiroquai]

Full disclaimer: i bought the truck with the sc installed so I am assuming the proper OD/ID hose was used, etc. The hose clamps appear to be just pinch style hose clamps of the proper size.

The hose coming out of the bottom connects near the driver's side fender. Assuming this is fuel line:



The hose which runs port to starboard from the valve (photo is engine bay facing aft) i have labeled as connecting to the air box (black plastic box between air cleaner and throttle body - not 100% on technical name).

As for the injectors - i recently replaced all 6 with a set of OEM i got off eBay

 

[I'mStock]

Curious who has gone the longest SC'd.

Mine was dealer installed in 1997 with 8 miles on the truck, I'm at 240K now.

 

[Bluecobra]

Mine was dealer installed in 1997 with 8 miles on the truck, I'm at 240K now.

Mine was installed in late 1997 on my 1998 model when it was brand new at the dealer. Only 158k on it now.

 

[gamefreakgc]

Still concerned about the variability in #4 & #2 compared to the other cylinders, but the readings are not nearly as low once you compensate for altitude. Surprised how much altitude moved those compression numbers up.

I've scheduled a leak-down test for Monday at a reputable local independent Toyota mechanic. He seemed surprised I would want a leak-down test when there is not observable performance issue. He said, ostensibly, if there was a serious leak issue there would be some evidence in how the truck is running. I'm confused by this, as well. The plugs all look great, virtually indistinguishable from one another. Truck drives great. Engine sounds good (no valve chatter or rough idle or anything). Here are the plugs:


Those are arranged as the are installed in the vehicle, right being front of the engine. So, clockwise from top left 6,4,2,1,3,5.

Your mechanic is right, you are overthinking it. Your engine is fine as long as it has no power loss or a rough idle (usually shows up if you have cylinders with low compression). The supercharger will be just fine. The charger only puts out about 6-7 PSI which is tame, especially for these bullet-proof engines. I'm going on 208k with my supercharger and have a similar variance in compression numbers.

A leak down test is for finding a known issue or testing for a head gasket failure. I guarantee it's going to come back as just fine.