Well are supercharged 4runner is now running 10 psi. Is this ok? When we bought it, it was running 5-7 psi. We have no fuel modes just a 2.2 pully. Do you guys know what could be causing this and is it ok?

Thanks

 

Sweet jebus man take that pulley off before you destroy your engine!!!

I guarantee you will burn up your engine if you don't take that pulley off stat. As a point of fact, you should really take the entire supercharger off unless you feel like buying the fuel mods.

I'll bet your engine pings like a mother...

 

Allow me to post a single picture in order to slam the point home (sorry Mark):

 

That is a lot of boost for a stock fuel system. The Supercharger was designed to boost the torque curve a bit, not turn the 3.4 into a performance engine.

 

I bet that prior to the 10psi change (the 2.2" pulley should NOT be making that boost), there was no ping. (location)

Back to the question at hand - no clue why your pulley that was making 7psi boost suddenly started making 10 psi boost.

 

It started running 10 psi after we ran some sea foam. What kind of boost should this setup have? If a vac. line is pulged would that cause the boost to rise?

 

I ran 7 to 7.5 psi boost (Gen 1 SC) in C-spgs. Friend ran 7 psi boost (gen 2 sc on a 2002 Taco).

To back up a second. Were you running 5-6 psi boost w/ stock pulley, then swapped in the 2.2" pulley for 7psi boost, then seafoam for 10 psi?

Or did the seafoam / pulley swap happen at the same time?

Or did you seafoam (Boost stayed same) then swapped pulley and boost went to 10psi?

 

None of this is really relevant, since the stock fuel system is not capable of keeping up with a 2.2" pulley. He needs to go back to the stock pulley before he cooks something. He's making an already lean condition even worse by forcing more air into the engine.

I seriously doubt that his engine has no ping. I live at 7500 ft and my engine pings like a mofo without the FTC.

...and the 2.2" pulley is usually good for about 9-10psi ASL.

 

I've seen two 2.2" pulleys (one mine and one a close friend) put out 7.5psi (at best) at 6000 feet. [hence why I think the 10 psi discussion is relevant and perhaps informative when root cause is found]

We should probably have a side discussion (another thread) for data gathering for people at elevation. Over a year ago, I did some data gathering at TTora and CT and found that all reported cases of 2.2" pulley at elevation yielded no ping (but this was 3-5 cases). I only have first hand knowledge of a 2002 Taco and a 1997 runner at 6k ft. taco has no issues. I could get some ping on my runner, but pulling the fuse at gas fillups remedied. Up to this point I assumed it was the older electronics.

Frankly your case of ping (With what i assume is the stock pulley) is very disconcerting - especially since you're at greater elevation than C-Springs.

EDIT - and yes, at the time I wasn't trying to analyze leanout. Assumably that happens regardless of ping)

 

Mine puts out about 6 or 7 psi on the boost gauge (which is accounted for with the loss of air density at altitude). However, the TRD boost gauge is not particularly accurate, and I wouldn't be suprised if his is off.

I have a Gen 2 supercharger with the URD Supercharger Fuel Upgrade Kit and URD 2.2" Supergrip Pulley. When I drove the vehicle from NC last year before I put the URD stuff on it (so stock pulley, no timing mods), it would ping on every uphill incline where I had high boost but semi-stationary rpms. With the 2.2" pulley and URD kit I have had to bump my timing retard up to 7.2 degrees in the low rpm/high boost areas to get rid of all the ping.

The biggest problem with putting a higher boost pulley on a stock fuel system is not that it induces ping, but rather that you get a hotter intake charge and risk dangerously high EGT's. As it is, you are also running at stoichiometric AFR in mid-boost while your ECU is still in closed loop, which is bad news; I wouldn't be suprised to find pitting on your pistons if your engine was disassembled. Just because the atmospheric pressure is lower at 6000 ft doesn't mean it's safe to run a smaller pulley without supporting fuel mods. Have you taken any measurements of your EGT's or AFR's?

 

The stock fuel system can barely hang on with the standard pulley on there. Also, a 2.2 pulley should do around 7... 2.1 around 9 and 2.0 around 10-11... I am running a 2" at 5000 feet or so and seeing about 10.8... although my gauge is probably slightly inaccurate as they all are.

1) Take the pulley off!!!! Youre nuts if you think it wont blow up!

2) What does your vacuum say at idle now

3) How many miles are on it since the 10 psi increase?

4) Our MAF should take into account small changes in atmospheric pressure and account for the fuel changes itself.

 

I've heard of them in 3-psi increments, so:

Stock: 6 psi ASL
2.2": 9 psi ASL
2.1": 12 psi ASL
2.0": 15 psi ASL

 

We bought it about a year ago and it had the 2.2 pully on it. At that time we were running 7 psi. We add seafoam in and put one of the vac. lines back on when we were in NM and now it runs 10 psi.

 

So I am going to put a stock pully on to start. The reason for me posting up about this is because it seemed high and I didn't want to blow something up.

I belive that there are about 30,000 on the 2.2 pully.

 

Sounds like we were comparing apples and oranges. I made the opposite trip and ended up at a similar end state as yourself. That is, I left CO with minimal issues, but started pinging down here in AZ. Then I added the URD kit. (and that's when I got interested in the effects of the SC; so no, no EGTs or AFRs runing the stock fuel setup at elevation).


My86 - can't wait to see your vacuum readings w/2.2" pulley and vac / boost readings with stock pulley.

 

So you guys are saying that I need to change the pully back to stock correct?

What about the issue of going from 7 psi to 10 psi?

 

An increase in shown boost can caused by a few things. One thing could be retarded timing. What does your boost gauge show at idle.... (mmHg)

 

Do you guys know where I can get a stock pully?

 

I have one I'll let go for cheap. PM me an offer if you're interested.

 

I bet you could run a 2.2 pulley at 5000ft no problems, if you dont have bigger tires because of the increased load on the engine. The 2.2 according to my ftc, makes around 5psi, but about 8psi on the boost gauge. There was someone here running a 2.1 for lots of miles with no problems. The elevation makes a huge difference.