NickLSJ

Alright guys, I'm getting the zzp stage 3 kit very soon. My question is in the title, should I get the 2.8" or 2.9" pulley? I have zzp cai, long tube header and down pipe, and a cat back. My cooling mods will be the zzp heat exchanger and I'm also getting dual pass. I plan to install option b in the future but it will not be on the car when I down size the pulley. I always have access to 93 octane in my area. Oh and also it is my daily driver for the time being. I've been looking and looking for awhile now on information about which size will be better for me but I haven't been able to come to a conclusion.

chevygirl2006

What size injectors?

NickLSJ

60lb

chevygirl2006

There's not really a power difference you will feel. Just pick one lol

ionRL_585

Yup. Just make sure to do supporting mods cause you will heat soak like a **** after a couple pulls. New ic pump and cobra h/e was my set up on my old irl.

I never did more than 3 back to back pulls and never beat it up when ambient temps were scorching and mainly drove at night so it was more than enough for me.

or just go turbo!

Viperoni

At least you've got the exhaust done.... it's more important to get the Dual Pass first thought.

NickLSJ

So if everyone's agreeing there won't be much of a power difference I think I'll go with 2.9 just to be a little safer, unless anyone gets on here and gives a good reason for 2.8, I still have a few weeks until I can buy it so plenty of time for opinions lol. Thanks to everyone that's already replied!

chevygirl2006

Go 2.7 and e85. Thank me later.

NickLSJ

Oh man I'd really love to do that, but there's not enough e pumps near me

Sharkey

iTrader: (1)

then go 2.7 with water/meth injection. been running that for the past 50k km, no issues whatsoever

chevygirl2006

Too Inconvient to me. I don't want to rely on meth and have something malfunction and. It spray or something during a pull. Just me though.

ionRL_585

cooling mods first then wideband, 60# injectors, 2.8, and tune.

mrbelvedere

iTrader: (3)

omg do cooling mods before it melts there is more then enough information on this site to answer any pulley question out there you just need to search and your first mod should be a wideband fueling is more important then post core temps

chevygirl2006

Why would you not already have a wideband before tuning? You're going to tune without a wideband?

Stumpalump

2.8 crosses the line to full tilt finicky and easy to blow race application. 2.9 is the size for a driver that wants to drive with his right foot and not worry about going boom.

chevygirl2006

I've been on a 2.7 pulley for almost 3 years. That's on a m62 and a tvs. I've taken 1000+ mile trips and tracked it a dozen times. Stock 2.4 motor and on e85 lol. Still runs amazing. "Easy to blow"

Sharkey

iTrader: (1)

i would agree that this crosses the line between what you can get away with on a canned tune and when you need a proper tune. when i bought my car in 07 it had a 2.85 and 42lb injectors. in 2011 i did some more cooling mods, dropped to a 2.7 and put 60lb injectors in, and ive been running it ever since. its tuned slightly rich, timing is a little conservative, i keep an eye on the wideband, and keep my water/meth tank full. if you step on it and the wideband shows its lean, or doesnt feel like its pulling like it should, you lift.

Henry3959

Our 2.4's have 20% more cylinder capacity.

chevygirl2006

Ok my friend with an lsj has been on a 2.6 forever with no issues and before my friend went turbo he was on 2.5 lol

07MetallicSC

iTrader: (16)

ran a 2.7 with full cooling mods and water/meth for years before i went to TVS. We tuned it richer up top incase the water meth ever failed ( which it hasnt in over 6 years ) the motor would be fine. dont waste time on a 2.9, just do full cooling, a wideband and the 2.8. scangauge wouldnt hurt to have either. This setup was fine for many many highway pulls, plenty of trips down the strip at New england dragway. Installed around 65k miles and the car has about 130k on it now with another owner. no issues. Car has a 2.5 gallon tank in the trunk and only needed filling maybe twice a year, three times at most.

jdbaugh1

iTrader: (1)

What size nozzle(s) was it running?

07MetallicSC

iTrader: (16)

whatever came with the snow performance stage 2 setup. we sprayed it pre blower which back then everyone thought ate the teflon off the rotors ( not true )

Staged07SS

iTrader: (25)

I wouldn't say don't waste time on a 2.9 pulley... More efficient gains can be had with a 2.9 pulley, ported head, and cams. My car was a prime example of that. This is not to say a small pulley car can't be made "efficient". The blower maps and how far you rev out with the smaller pulley will tell the tale.

I know most on here will never dig into the cylinder head or block for that matter, so the next simplest way to make decent power is a small pulley and loads of cooling mods. I chose to follow the build book, and it made for a very strong and reliable build.

07MetallicSC

iTrader: (16)

This is true. I was going on the assumption of not touching block or head as most dont do that.

Staged07SS

iTrader: (25)

Yup, I def agree with you and the smaller pulley for more torque in this case!