nuke1105

just spoke to a mechanic at a local toyota dealer and he said that he would first try a cooler spark plug and a lower temperature thermostat. I was doing some more searching on line and came across the URD 7th injector kit Link----------> http://www.urdusa.com/product_info.p..._id=1260518512

I dont want to spend the 1000 bucks unless its really gonna solve my problem. What do you guys think? I rather spend 1000 then have my engine blow up........I just want to get a second opinion.

LarsDennert

the bkr5 and ik16 plugs are stock. Go with ik20 or bkr6 for one stop colder.

Make sure it's detonation you are hearing and not a sc in need of service.

nuke1105

so your saying to replace the spark plugs and that should solve the detonation noise im hearing? What about the 7th injector kit?

LarsDennert

No. I'm saying figure out what's broken. If it's plugs then go one step colder.

I hear you on the 7th injector. It's costs more than I paid for my SC.

mastacox

Well, if you have audible ping like you are describing, it's probable plugs and a thermostat won't be enough. However, its a relatively cheap thing to try first.

Get some Denso Iridium IK-22 Spark Plugs which are 2-steps cooler than stock and make sure to gap them between .032" to .035", which seems to be the optimum for a supercharged 3.4l.

For the thermostat, get a 170 degree one, that's what I'm running and it works well.

If those two things don't work, you'll have to get a way to retard your timing, which means a piggyback control unit like the one that comes with the URD 7th injector kit. When (if) you get the 7th injector kit, make sure to get the wiring harness adapter, it will make your job a lot easier and 100% reversible.

rimpainter.com

I tried to ditch my audible HG/LR ping in stages but it simply did not work. I went for the cheapest things first such as plugs, thermostat, free fmu, coolant bypass, even heat reflective tape on the fuel line. While many of those items made a small difference, the sum of all parts did not solve the problem. It wasn't until I went with Supra injectors, Walbro 190, and the SMT6 piggyback (with 11 degrees of timing retard in some places on the map!) that I got rid of audible ping. Of course I was running my rig in one of the hottest places in the US (Phoenix), so the environment was extreme, and only 91 octane was available, but still - check out those timing retard numbers! Now that I'm in the PNW I re-mapped the timing maps to about -5 degrees (yes ambient temps make that much of a difference). Moral to the story: Give those little things a shot until you can afford the "big" fuel/timing mods. At least you will alleviate the problem a bit for under $100. Oh, and if it makes you feel any better, the donor rig I purchased had 197K miles on it; 100K of which were supercharged with NO fuel/timing mods. The thing pinged like a mother but it held strong. Just goes to show you how durable the 5VZ is.

nuke1105

So after doing some more research this is exactly my problem. Thank you guys so much for the info. I spoke to Gadget this morning from URD and he explained to me that his kit will solve my problem but the solution is going to set me back 1,000 bucks. At this point I really dont know what to do since I dont have the money for the kit right now. I was thinking of just removing the SC from my truck since I still have the original intake manifold. Theres a toyota mechanic down the street from me that is really considering buy a SC for his tacoma, so what im thinking is giving him my SC in exchange for the labor to remove and replace with the stock stuff and maybe ask him to do a complete fluid change and tune up on my truck. I think that would sound like a good deal right? Im surprised that TRD never addressed this problem with there SC. I called them this morning and spoke to some dummy there that didnt know much. He also said that its impossible for me to have TRD headers because TRD didnt make headers for my year truck (TRD is stamped right on my headers and they were dealer installed). So that shows what kind of techs they have working there. He also said that TRD has no solution to my HG/LR ping problem and that hes has never heard of such a thing with there SC's. So............I dont know what to do. Sell my truck, spend the 1,000 bucks next year or just have it removed. My only concern is that the truck now has 120,000 miles and Im sure there is some internal damage by now since this problem was never fixed. How much more life should i expect from this engine if i were to add the 7th injector kit?

mastacox

Well, depending on how many miles are on the supercharger I would ask for at least $750. Used in OK condition it's probably worth around $1500 and taking it off is pretty easy (probably around 1 hour of shop time if you go slow).

You could always take it off and keep it until you have the money for the URD kit too...

Well, they did release the TRD 7th injector kit which helps with some of the fueling problem, but doesn't address timing or the undersized fuel pump.

Well he's either feeding you a line, or doesn't know what the heck he's taking about. Either way I would avoid him.

There are lots of people with over 150k-200k miles with a supercharger and still going. I personally would expect that your engine will make it to 200k without too much trouble, but it depends on how you drive more than the supercharger. My engine has had the supercharger for over 100k miles now (I'm at 150k, about 60k of that with a URD kit) and just recently had to change the head gasket, but other than that my engine hasn't need any extra work (other than getting the nose drive of the SC rebuilt). The 3.4l engine is very reliable, even with the supercharger on it.

If I were you I would remove the S/C and keep it until you can buy a URD kit. That or take it off or sell it here because there are LOTS of people that would give you $1500 for it without trouble.

nuke1105

1500!!!! Wow!! Thats alot!! I was thinking i would be lucky to get 500! Well you just made my day better. I will just order the kit from URD in a couple of months. As far as the Nose cone.......Does the complete SC need to be rebuilt or just the cone? Have you ever rebuilt your complete charger??

mastacox

I actually got my entire charger rebuilt by Magnuson (the original manufacturer) for a around $350, which included new nose drive and bypass valve, new bearings for the rotors, and shipping. As long as the rotors are in good shape that will be your price, if the rotors have to be replaced (which is unlikely unless one of your bearings fail) it will cost $750.

Here's my 4Runner's mods page

Link: My supercharger rebuild thread
Link: Some of my supercharger tuning experiences
Link: Top-end rebuild thread
Link: Cruising the dunes with supercharged 4Runner

LarsDennert

So why the IK22 over the IK20? Have you tried both and do the IK22s do a better job with HG/LR ping?

Once or twice I've been able to get my motor to ping momentarily. I only installed the SC 200miles ago. Stock plugs and thermo, half a tank of 87 and the other half 91, so um 89 pump gas at the moment I figure.

ECT is always on because I'm geared poorly with 33's. I think I'll tighten the kick down cable a bit too to advance the shifts.

Thanks for any advice.

mastacox

I think the IK20 is only a single step cooler, where as the IK22 is 2-steps cooler. It's best to get the coolest plug you can.

I'm assuming that's because you just installed the supercharger 200 miles ago. Make sure and run premium (91 or higher) from now on.

Running with ECT on all the time is fine, you may take a slight hit in your mileage because of it though. Also, tightening your kickdown cable is an excellent idea to firm up your shifts.

nuke1105

Will adding a fuel octane booster help eliminate the ping in a short term?

LarsDennert

Possibly but the computer may refuse to go into closed loop and complain. Happened to me on a Camaro with 105 octane.

I'm speculating as these are the first mods on the 3.4 I've done. I'm still learning from those who've been down this road.

okie81

Yes. It's an expensive option, but it will work. I did it for 4 months while I saved money for the 7th.

nuke1105

Good to know that. I will be pulling a trailer to the desert in a few weeks so I'm going to make sure I pick some octane booster for the trip. I just spoke to gadget from URD this morning and I will be ordering the 7th injector he sells. But it's good to know that an octane booster will at least help not get the pinging when pulling a load. Thanks for the info.

LarsDennert

I wonder how many people are running a smaller pully? Seems that would cause quite a bit of detonation.

So far I'm trouble free but I guess towing will be the real test. On BKR7 plugs and 92 octane... I'll keep my fingers crossed.

Tragic Drive

With the 3.4 you should be in open loop at around 80% throttle position.
You can use a OBD2 scanner to verify this.

nuke1105

what is closed loop? Im no expert but i hear it alot. When the super charger is in closed loop does that mean that its in boost mode?

Tragic Drive

Open loop is when your ECU isn't using feedback from your fuel management sensors.
Closed loop is when your ECU is using the sensors to try to get your fuel to 14.7 AFR's
Check this link page 11 but you should read the whole thing.
http://www.gadgetonline.com/U-Tune.pdf