trd supercharger w/ a larger 2.65 pulley or 2.8 pulley

[s20004runner]

First, I have been doing a lot of searching / reading but I couldn't find any clear answer.

Do you think if I went to a larger pulley 2.65 (5.25psi) or 2.8 (3psi) (stock is 2.37) which reduces boost, would I still need fuel mod upgrades (URD 7th)?

My logic is that I only want a small hp/torque gain for dd/travel comfort w/ minimal wheelin'. I don't want to drop another $800-900 for the URD 7th kit when the supercharger may cost $2-3k. I love my t4r and i want to keep it forever, but I still have to be realistic that it's 15yrs old (200k miles) and it's worth no more than $6-7k.

 

[awpsome]

IMO, it wouldnt be worth to supercharge in the first place in your situation. You either can pay to play or at that point with a larger pulley, if one even exists, your cost to power ratio increase would be minimal and not worth it. Save your money

If your projected cost is $2-3k for the SC and you want to run it at lower boost because you rather not spend another $900 for the URD 7th. Save the $2-3k and realize with that low amount of boost its not going to be worth the price for a barely noticeable power increase.

I hope you dont read this response the wrong way, it may seem a little harsh and not the answer your looking for, but i mean it respectfully and am giving you my input on it.

Here's the thing with SC, although dealers were selling trucks off the lot with it installed with no fuel mods, they still run fine. Not optimal or healthy in the long run but they did install them. From this you can consider SC'ing now and then later upgrading to the 7th injector. You dont HAVE to do both one time. The reason why majority do is that when they plan to SC, they plan to get the most out of their money. Pairing the SC with a 7th will better the power to cost ratio. Also helps retain engine health in the long run from running proper AFRs.

On a side note, i am pretty sure you will be able to find an SC for a lot less than $2-3k unless you are planning to buy brand new (granted you can find a brand new one still).

From what i've seen and because ive SC'd myself, i was able to do the entire SC upgrade with a 7th injector for under $2k.

 

[UnderFire]

It'd be a waste of time and money to run that low of boost on a supercharged set-up, keep in mind that you are using the engine's power to wind up the supercharger, so you'll basically gain nothing.

I personally think your best bet if you're looking for a little more oomph is to put a little lower gears in the diff, I'm not talking anything major, but if you are currently a 4.10, you could find both diffs out of a runner with factory 4.30's and drop them in for a fraction of the cost of a supercharger set-up.

 

[angus]

First, I have been doing a lot of searching / reading but I couldn't find any clear answer.

Do you think if I went to a larger pulley 2.65 (5.25psi) or 2.8 (3psi) (stock is 2.37) which reduces boost, would I still need fuel mod upgrades (URD 7th)?

My logic is that I only want a small hp/torque gain for dd/travel comfort w/ minimal wheelin'. I don't want to drop another $800-900 for the URD 7th kit when the supercharger may cost $2-3k. I love my t4r and i want to keep it forever, but I still have to be realistic that it's 15yrs old (200k miles) and it's worth no more than $6-7k.

Actually I am on your side on this one.

With less boost you could run more timing (like stock) and you'd have less overall chance of pinging, less heat and maybe less worry.

It think that it would certainly work "better" but it still wouldn't work great. You have to remember there are parasitic losses of the supercharger itself that need to be overcome.

I think if you could get 5psi and maybe use a RRFPR then you might get satisfactory results.

BTW - where did you get the info on what boost level you will get with those larger pulleys?

If TRD claims you get 75hp from the blower, I think a lot of people might be happy with 50-60 and more reliability.

 

[s20004runner]

thanks for the input guys.

I got the psi #s from this website. I don't know how accurate it they are, but these pulleys are slightly larger than stock version so I assume it will reduce the boost. (TRD High Performance Supercharger Pulleys)

Yea, same here. I had to first go see if anyone made such pulleys and when I found this website I was curious to anyone has ever done it.

Besides the money factor is that when I saw that the URD 7th included a new fuel pump, that's something I didn't want to do. I also thought about putting in larger fuel injectors then found plenty of advices to just get the URD 7th kit.

Anyhow, if I do go s/c route, it won't be for another 6 months or so.

 

[SCRunner12]

Check out this thread, it's from a few years back, but the guy ended up making a 2.65 pulley and was happy with the results. http://www.toyota-4runner.org/3rd-gen-t4rs/75906-looking-trd-sc-pulley-larger-than-2-37-stock.html and http://www.toyota-4runner.org/class...-2-65-supercharger-anti-ping-pulley-sale.html

Unfortunately Nacho has passed away, so please keep that in mind if you were thinking of trying to contact him.

 

[angus]

I just looked at the pulleys here:

TRD High Performance Supercharger Pulleys

They look good and the price is right - I will definitely keep them in mind if I want to go up or down on boost, I am going for a dyno tune later this week when my 7th injector is set up - if I don't like how close it is to knocking then I will go for a bigger pulley.

I don't mind losing say 10hp in the name of reliability.

 

[Smokie]

Personally, I'd try opening up the exhaust path for that little bit of gain.

Set of headers, high flow cat, and a good muffler.
After reviewing the numbers, it's unreal how much the stock exhaust restricts things.

 

[angus]

Personally, I'd try opening up the exhaust path for that little bit of gain.

Set of headers, high flow cat, and a good muffler.
After reviewing the numbers, it's unreal how much the stock exhaust restricts things.

You got any links to the proof of this on the 3.4?

I do know that a high flow intake and exhaust can drop the boost level on some engines.

 

[Smokie]

You got any links to the proof of this on the 3.4?

I do know that a high flow intake and exhaust can drop the boost level on some engines.

Underdog Racing Development

Correct me if I'm wrong, but it looks like that is a decent gain just from a bolt on part.

 

[angus]

Underdog Racing Development

Correct me if I'm wrong, but it looks like that is a decent gain just from a bolt on part.

I can't tell if that is 240 to 256 or 248 to 256.

Either way, if that graph is correct - there is no way I am paying $700 to gain either 8 or 16hp.

For $90 you could change the pulley and gain more than that - (if you have the URD 7th injector then you can tune it for free or even cheap if you pay to have it tuned)

Even if you are paying to have it all installed and dyno tuned - the cost to hp ratio for headers vs. a pulley is no contest.

BUT -

This thread is about LOWERING the boost to gain reliability - or those owners here who cannot get rid of their pinging.

 

[s20004runner]

Check out this thread, it's from a few years back, but the guy ended up making a 2.65 pulley and was happy with the results. http://www.toyota-4runner.org/3rd-gen-t4rs/75906-looking-trd-sc-pulley-larger-than-2-37-stock.html and http://www.toyota-4runner.org/class...-2-65-supercharger-anti-ping-pulley-sale.html

Unfortunately Nacho has passed away, so please keep that in mind if you were thinking of trying to contact him.

Thanks, What happened to Nacho?

 

[SCRunner12]

Thanks, What happened to Nacho?

Not sure of the details, but he passed away a few years ago. His wife let the forum know when she was trying to figure out what to do with his 4runner.

 

[Robb235]

Perhaps instead of lowering boost, maybe go with a water/methanol injection kit. You can get a good one for a few hundred bucks versus the $900 for the 7th injector.

 

[angus]

Perhaps instead of lowering boost, maybe go with a water/methanol injection kit. You can get a good one for a few hundred bucks versus the $900 for the 7th injector.

Yes, and I have meth injection on a few cars of mine - the thing is I want the runner to be hassle free and that includes not having to pour meth into it.

Not having to worry if it is running out or clogged.

I have it in some hi powered boosted cars of mine and it's fine because I don't drive them much.

 

[angus]

I'm one step closer to the bigger pulley -

I installed my URD 7th injector kit today and it's now faster but still ping happy!

 

[sjwelna]

I have to ask the obvious but you are running premium gas right? :nerd:

-Steve

 

[angus]

I have to ask the obvious but you are running premium gas right? :nerd:

-Steve

Yes, I don't use regular in any vehicle.

Hopefully my settings (preloaded map) are just wrong for me.

 

[sjwelna]

Can you datalog and get some wideband AFR data to look at and log knock sensor counts? Sounds like you are just running lean, even with the 7th injector. I'd try to not beat on it until you get some more fuel in there...lean knock under high load/full boost is a recipe to break something. Not sure how sturdy the stock pistons/etc are on these cars but subaru's (sti's) are notorious for breaking ring lands on the stock pistons if you start knocking with higher than stock power levels. What tuning software are you using? I don't know what's available for 4runners so I'm curious.

-Steve

 

[angus]

Can you datalog and get some wideband AFR data to look at and log knock sensor counts? Sounds like you are just running lean, even with the 7th injector. I'd try to not beat on it until you get some more fuel in there...lean knock under high load/full boost is a recipe to break something. Not sure how sturdy the stock pistons/etc are on these cars but subaru's (sti's) are notorious for breaking ring lands on the stock pistons if you start knocking with higher than stock power levels. What tuning software are you using? I don't know what's available for 4runners so I'm curious.

-Steve

Thanks for the advice, I know these things.

It's actually pig rich so I think there is too much timing.