Supercharger issues (HELP!)

Hi there:
So I ended up installing the Magnuson Supercharger. I also went with the URD 7th stage injector kit and the smaller URD pulley. Well, California gas doesn't help, so the truck was detonating, so I had to install an Alcohol injection kit. That didn't help. Truck is producing up to 12 PSI boost. The shop recommended going back to the stock pulley, which we did (Disconnected the 7th stage injector kit as well). Now, the truck is producing 8 to 10 PSI boost (which the Engine still doesn't like). The shop has recommended I get a bigger pulley (a 2.65 instead of the stock 2.37). Magnuson swears everything should be fine getting 6 to 8 PSI with stock pulley, and that the truck got messed up going straight for the URD pulley (throwing the tunning off). They kind of recommended disconnecting the battery and letting the truck re-tune itself. Thoughts? Ideas? Suggestions? I'll take anything!

P.S: I have TRD headers, Dual exhaust after the muffler and colder running Spark plugs (came with the 7th stage injector kit).

 

I am looking and th Magnuson Supercharger and am curious if you have made any progress on getting this fixed?

 

Not yet. What do you reckon? Want to get one too?

 

I have not a clue what the problem might be. Seems like stock pulley and 7th injector together might be what to try next.

I really want to to get the supercharger for myself for Christmas. It is calling my name and has been since I bought this 2004 tacoma a few months ago.

 

Any idea of what codes it threw

 

that seems like high boost numbers for a stock pulley, i always thought 5-7 psi was normal stock, 7+ is with aftermarket pulleys, i had a trd s/c and have been running 6lb boost its whole life..

 

I was thinking the same thing...a little Christmas gift for myself I'm
Going with the 7th injector kit as well and just picked up some TRD headers off of EBay. Going with Magnaflow from the headers back.

 

8-10 psi with the stock pulley? That sounds way high. And definitely likely to ping without the 7th injector. How are you measuring the boost?

 

You need to tune your 7th and meth. It's
Really that simple. What octane gas are you able to get and did you install the 2-step cooler spark plugs?

I would also recommend mixing your own methanol and playing with the ratio as needed. The methanol alone should suffice in suppressing detonation but it may require a very high ratio of methanol.

Get wideband afr in order to tune.

 

Not familiar with supercharges in a Tacoma, but 12 PSI is a fair amount of boost. What are you using for engine management?

 

12 psi is a lot more boost than what the trd sc was originally designed to put out, I wonder if that's the issue?

I was having terrible knock with my s/c until I upgraded my spark plugs, but you already said you're running cooler ones...

 

You must have a faulty boost gauge because I do not believe those numbers. I have 2.2 and 7th injector and get 7psi in California

 

Yeah sounds iffy. Boost gauge is off, or this explains it as over-spinning the TRD blower to make that kind of boost is at it's extreme limit and is basically spitting out super heated air. If not that, its a sign you have an exhaust blockage/backpressure and could also explain the ping. If you have the OEM cats, check them out, when they block up the S/C guys get crazy ping and sluggish performance.

x2, get the right nozzle, duty cycle and mix, it can squash most any ping.

My 2.2 barely gets me 9psi, you at 7psi are you at a higher elevation or did you remove the cats?

I need to retune my water/meth, it pumps waaay too much, but for now I've been running E85 from time to time (AEM FIC, 620cc injectors), that stuff is just amazing, it refuses to ping. I zero'd out all the timing I was pulling and I'm tempted to go Greddy EMU so that I can actually add timing in boost and get the most out of the fuel.

The OEM ECU is very adaptable via the primary o2 wideband, you could probably get away with an E40'ish mix, but that would be putting a band-aid over the problem, something is causing a lot of ping and needs to get sorted. I've heard of Underdog Performance working on customer setups that ping a lot more than others and they can't figure out why- exhaust is good, valve timing good etc, all he could say is maybe some come from the assembly line just a little more prone to ping than the next one-- IMO my 5vz is one of those, tuning out the ping via just fuel and timing makes it loose a lot of power, so water/meth and E85 has been awesome-- but the fact is I CAN tune it out with 91 octane if need be, but your setup sounds like something needs to get addressed.

 

I have one cat and two mufflers. It barely hits 7. Also verified by checking with the urd controller. I had a 2.1 and I only hit 8 maybe 9 ever once and a while. Im at sea level

 

Sounds like you freed up some backpressure on your exhaust so the numbers are a bit lower, but thats a good thing, less resistance to a fixed flow source, more air actually getting into your motor than getting cramped up in the manifold.

In my older age I'm actually happy with my OEM exhaust/not having to hear my engine, but my bud built trac bar requires I change my muffler, will be interesting to see if peak boost goes down if the new muffler manages to lower back pressure. I'd like to get a look at my cats too, as my 5vz has always been on the pingy side.

 

I have a cat and two mufflers so I would assume it's clogged if anything lol

 

Sounds like the OP still has both cats, so about just as restrictive as stock, in fact going duel muffler and introducing a Y pipe to do so might not really gain one additional flow over the OEM setup...

But if the OP's boost readings are accurate, and the ping that un-curable, I'd bet there is a bad blockage/melted cat- seems to have happened to a few S/C 5vz.

 

I only went dual (small) muffler to reduce sound

I would def check the cats

 

Same goal here. I'm do NOT want to mod my exhaust (can't believe I'm saying this having been a sport compact guy in my younger years, total 180) but have to in order to get rid of my axle wrap with a product I've already bought. Been researching how to mod it tastefully/not increase DB that that is a very rare goal for people, so pretty dry on the interwebs-- will just have to 'bro science' it as best as possible. I have a MIG, an IS300 resonator and some other spare parts and figure I can fab something up that doesn't increase backpressure, doesn't overly open it up either and keeps DB down while making the space for the bar.

Funny experiment, welded up another spare IS300 resonator to a friend's 3-slow 3.0 Toy truck and it a) wasn't much louder than the muffler it replaced, sounded really really good and b) noticeable power gain. Win win mod. So on the 2001 3.4, the IS300 resonator bolts on (not perfect, but good enough to jimmy the OEM muffler to the side and do a little run down the street) so did it thinking it would be a similar result-- wow, drone for days, would get a headache real quick. So have to make some kind of combo setup resonator and muffler if going aftermarket on the muffler.

I digress, sorry OP. But get your cats looked at, check that off of the list.