I recently had the trd s/c installed on my '08 auto. The power gain has been pretty decent for a pretty much stock application that's all under warranty, but it seems like when I try to run against someone, or just show the s/c off I get disappointed.

It looses power once i get above 5,200 rpms. It's almost like I'm hitting the breaks or something. Once it shifts to the next gear the power is back, but then the process repeats itself. It seems like I had better power at the top end when I was running all stock.

I also run a modded injen CAI with the setup. I don't know if this is part of the problem or not. I'm thinking it could be my blow-off valve, my ecu, or maybe my exhaust backpressure is to high. I a noob, so I really have no idea.

Any help is greatly appreciated.

 

Did the ECU get reflashed properly? It sounds like maybe timing is being pulled and/or there's not enough fuel.

 

i assume toyota reflashed the ecu. I saw the guy finishing up on it, but you never know. It does feel like there's not enough fuel. What should i do? take it back to toyota?

I was thinkin about going ahead and getting a boost, oil pressure, and a/f guage. maybe they would help me figure out what's goin on?

 

Take it back before doing anything to it.

 

was it like that before the SC? is it because ur an auto?

 

imo take it back ..but first, take off the modded CAI that might be the problem .. put back on the s/c airbox then take it back

 

Swap the stock intake back on and see if the problem still occurs. The BOV could possibly be faulty and not hold pressure over approx 4psi.

 

toyota installed the s/c with the cai already on the car. they are the ones who modded (cut) it for me. they said it wouldn't be a problem and that it should run fine with no warranty issues so i figured i would keep it.

it's going to be a real b***h to uninstall the cai and put the trd box on since i'd have to move the fuse box and all of that stuff.

maybe i should just take it in as is, or would that raise a red flag and make them second guess themselves about the cai? maybe they will put the trd air box in for me if the cai is the problem?

 

What about the BOV? Did they install that too?

 

Putting my money on the bypass valve...always heard they were crappy ones, so it might not let u keep building boost, hence the "HP wall"

 

yeah toyota installs a 102 bosch bpv. i've read different info on different post here, but the general consensus is that the 102 should be replaced with a 110. It supposed to have better internals and allow more boost before it recircs.

TRD says that changing the bpv voids your warranty, but the parts look exactly the same and there are no "tamper proof" devices on the bpv so Im going to go for it. I'd rather get it and that not be the problem then remove the cai and go to the trd air box and that not be the problem.

first i will take it to toyota and see if they can figure it out. It sucks to spend almost 4K and not run right so they need to make this right. of course you don't want to tell them how hard you are on the warrantied car so it's tough to explain power loss at 5500 rpm.

 

Ooh, a BPV, not a BOV. I was thinking you had an aftermarket BOV installed.

 

are you just going by how the car feels? if you are, then your mind might be playing tricks with you. being auto s/c myself, i felt the same way when stock. you get a nice little umph when you punch it, but once it gets to the higher RPMs you stop feeling it and feels like your going nowhere, esp. in a side by side comparison with another car . so if you are just going by how it feels, keep that in mind. i dyno'd 170whp with stock s/c setup and header-back exhaust. so it's not exactly a powerhouse, even when riding all the way to redline.

another scenario could be that the stock bpv just sucks.

 

yeah, i know what you mean. i don't expect to be breaking records with it but it would be nice if it didn't shut down at high rpm. it slows as if i were stepping on the break or letting off of the gas.

before i had the s/c i noticed that it seemed to drag close to redline, but not like this. the range of where it slows it wider and more pronounced.

from what everyone is saying i'm thinking

a) go to the dealership and complain
b) replace the bosch 102 bpv with the 110
c) replace the cai with the trd breather

any other suggestions or comments are more than welcomed

 

Don't do B.

 

i dunno, sounds a lot like my situation. unless the car is actually cutting off fuel and you start to decellerate (spelling?) i dont know if complaining would do any good.

but if you are going to take this to the dealer, definitely change everything back to stock. don't give the dealership a reason not to help you. might be a pain to put it all back to stock, but save yourself the bigger headache if anything serious actually does happen and you need to call in the warranty on it.

and for the bpv, i recommend forge 007.

 

yeah, everything is the way that they installed it right now. i just hate going to them. they don't really seem to know much about the s/c or anything for that matter.

carbonxe, you don't think i should change the bpv?

 

i think he means dont change it and then go to dealer?

 

If you change it, you can kiss the warranty good bye, because they will pin the problem on that. Check over your paperwork and make sure it has something about the CAI on it, otherwise they will pin the problem on that and tell you to GTFO.

It all depends on the situation, I say just don't touch anything, you have the warranty, use it. I'd just be concerned about the dealer trying to screw you over about the CAI and say that they don't guarantee work on aftermarket parts.

 

yeah, i should have just uninstalled the cai before i got the s/c done. i asked them about it and they said it wouldn't be a problem so i left it on, but they could change their minds.

as far as the bpv goes i wouldn't take it in with an aftermarket one on there. that would be warranty suicide. that's why i like the bosch 110. it looks stock