Supercharger smaller pulley

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1973Guppie

1973Guppie

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Considering trying to add a smaller pulley boys 2.8 pulley to my supercharged 96 fzj80. I have sold my air to air intercooling setup as I decided I do not want to cut the hood and mess with altering everything so much. I am guessing that it would be easy enough to remove the 2.8 pulley and switch back to the 3.25 trd pulley if necessary.

I am curious if there is anyone out there that is running a smaller pulley without any intercooler mods to lower the intake temps and if you are having any problems with heat? Right now my truck runs very cool. It has an al rad, lantank fan clutch, etc and rarely gets over 194F. I have had it as high as 90 degree ambient outside temps.

I may go with methanol injection eventually as I like the idea of having something that is hidden that does not alter the truck too much and can be removed easily if necessary.

Thanks for the info.

Noah
 
It may seem like a whole lot, but DJsixbillion's liquid cooler setup doesn't mess up any of the factory parts of the body, motor, or S/C - it only replaces the ~8" cast charge pipe where it bridges over the valve cover, and a little Dremel work for hoses out to the radiator that bolts in front of the main radiator.
I bought one of his setups because it was simpler than reinventing the work, and the components he has are super - it exceeded expectation, and I'm fussy.
I was impressed as heck with his install thread - and if his stuff works half as well as the components build quality, it's able to take a real small pulley.
$$$, but he stands by it.
His charge cooler is a custom build piece, not a cheap frozen boost with the caps re-TIG'ed BTW.
 
well I guess I should be the guinea pig then?? :)

I guess worst case I remove it if I end up running hot and sell it. I have decided I really don't want to mess with an intercooler.

I am also curious how a smaller pulley will effect my smog #'s? sucks but here in CA you have to think about this stuff.

I really like the idea of methanol injection. Snow performance has some setups that are plug and play and simple to install and remove it necessary.
 
1973Guppie said:
well I guess I should be the guinea pig then?? :)

I guess worst case I remove it if I end up running hot and sell it. I have decided I really don't want to mess with an intercooler.

I am also curious how a smaller pulley will effect my smog #'s? sucks but here in CA you have to think about this stuff.

I really like the idea of methanol injection. Snow performance has some setups that are plug and play and simple to install and remove it necessary.
Click to expand...
I might buy a 3.0 and 2.8 along with a pulley removal tool. During colder ambient temp times of the year, take advantage of the 2.8...monitor temps accordingly. Then, switch to 3.0 or back to the original as needed. From my understanding, its about 12-15 hp and ft/lbs per .2" of pulley reduction. Saw that posted up somewhere.

Although, I'm interested in what @landtank gets after...
 
I've installed the 2.8" pulley with no other mods. My cooling system is in good shape with a new oem radiator and modified blue fan clutch.

I put the pulley on in January and it's not exactly hot here in socal lately. So far my temps are fine. I've taken it up to big bear and the power was amazing with no heat issues. Remember ambient temps are low. Highest temp on my scangauge has been 198*. I'm going to the desert rendezvous and can report back after...
 
Mlachica said:
I've installed the 2.8" pulley with no other mods. My cooling system is in good shape with a new oem radiator and modified blue fan clutch.

I put the pulley on in January and it's not exactly hot here in socal lately. So far my temps are fine. I've taken it up to big bear and the power was amazing with no heat issues. Remember ambient temps are low. Highest temp on my scangauge has been 198*. I'm going to the desert rendezvous and can report back after...
Click to expand...

please do! I would be interested, thx for posting......

if I can get away with not having to mod anything that would be great. I do have plans for an aux fan up front for low speed travel.
 
2MinutesTurkish said:
I might buy a 3.0 and 2.8 along with a pulley removal tool. During colder ambient temp times of the year, take advantage of the 2.8...monitor temps accordingly. Then, switch to 3.0 or back to the original as needed. From my understanding, its about 12-15 hp and ft/lbs per .2" of pulley reduction. Saw that posted up somewhere.

Although, I'm interested in what @landtank gets after...
Click to expand...

What pulley removal tool are you looking at? I need one also but none I've seen would actually fit with the radiator in the way.
 
By the way I did just pass smog :) barely... lol

I've been battling p0402 and I was able to smog while my ecu was 'ready' and I passed. woohoooo!
 
Just an FYI the issue with the smaller pulley isn't engine coolant temps. You will likely not run any warmer coolant temps it is IAT temps. If the IAT's are higher (and you will have no way of knowing and your motor will have no way of knowing) then you will get some detonation or predetonation events and your truck will pull timing negating the benefit of the smaller pulley to begin with.
 
scottryana said:
Just an FYI the issue with the smaller pulley isn't engine coolant temps. You will likely not run any warmer coolant temps it is IAT temps. If the IAT's are higher (and you will have no way of knowing and your motor will have no way of knowing) then you will get some detonation or predetonation events and your truck will pull timing negating the benefit of the smaller pulley to begin with.
Click to expand...

but this scenario you are talking about would most likely only be at higher ambient temps, correct? when I talked to pulley boys they said that at 2.8 size pulley the factory ecm should be able to adapt to handle the smaller pulley.
 
^^^^^

If you are going to run the smaller pulley in the desert I'd familiarize myself with muting the SC. I can't remember off hand how to do it but It's rather simple and would be wise to do if you start to detonate.
 
I wouldn't trust pulley boys knowledge of an 80 series ECU. I bet they would tell you "sure any ECU can adapt to our pulleys." But it has been shown over and over again that the 80 series ECU doesn't do any adaptation at all to boost. It simply tries to reach 14.7:1 using narrow band O2's in closed loop and it fuels extra rich in open loop. In reality if it adapted to boost you would see 12:1 or so anytime you are above atmosphere manifold pressures.
 
scottryana said:
Just an FYI the issue with the smaller pulley isn't engine coolant temps. You will likely not run any warmer coolant temps it is IAT temps. If the IAT's are higher (and you will have no way of knowing and your motor will have no way of knowing) then you will get some detonation or predetonation events and your truck will pull timing negating the benefit of the smaller pulley to begin with.
Click to expand...
Is there a mod to read the IAT's? Some sort of guage? The real problem is the M90's maxed out efficiency, yes?
 
Not trying to hijack- the 2.8 pulley would be great, hope it works well
 
landtank said:
^^^^^

If you are going to run the smaller pulley in the desert I'd familiarize myself with muting the SC. I can't remember off hand how to do it but It's rather simple and would be wise to do if you start to detonate.
Click to expand...

You mean zip tying the bypass valve open so it doesn't boost?

And no I haven't had any pinging...so far.

My intention is and has always been to run the regular pulley during summer months.
 
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