Bika

iTrader: (3)

np

Mss26

Hey it works too... it matches the HPT log above...

Pulse Width = 20, RPM = 6900... and 20 * 6900 = 138,000 and then 138,000 divided by 1200 = 115% just like the log says Man it's been a while since i actually learned something from this forum lol.

schamsy

LOL I've got ALL these people saying "you'll max out your injectors" but not one person saying. I have blown #4, or I over revved the charger, or some other thing to that effect... So I'm gunna go ahead and buy it and maybe I'll be the first to actually break something, cause it does look like anyone else has.

Bika

iTrader: (3)

people have. you wouldnt be the first. run it hard for long enough you will see that heat + lean = boom.

also people tend to forget that shoving more air into an engine with JUST a smaller pulley isnt the best way to get more power.

Connor05

ive been running a 2.9 with stage 2 tune for a while now and i live at sea level. My car runs just as good as it did when i got it brand new.

hungryhip-ccp

iTrader: (2)

ding ding ding you have the CORRECT answer...

sput

iTrader: (3)

I tested out my 2.9 today and my injectors were running at 100% or higher over 6750 rpm. Now obviously this is not normal operating conditions so running a 2.9 for daily driving in my car is just fine.

I've concluded, however, that since I do occasionally take it to the track and run up to 6800 rpm or higher that I'm going to use a bigger pulley that I have instead. I think in the long run my engine will last longer.

This is a good thread. I learned quite a bit from it. Thanks cobaltss.net

stavros

subscribed. i have a 2.9 now... thinking about a 3 inch now

hungryhip-ccp

iTrader: (2)

check out this thread if your curious about heat&pulley sizing

https://www.cobaltss.net/forums/2-0l-lsj-performance-tech-47/2-8-42s-dyno-results-113169/

OntarioBalt

watch for a **** load of 2.9's is the classified section soon...lol

hungryhip-ccp

iTrader: (2)

for daily driving i would much rather use stage 2 pulley vs 2.9 as 2.9 will create more unwanted drag and cause worse mpg

sput

iTrader: (3)

Yes I just meant the injectors would be ok with it. I switched to a 3inch pulley already.

rukkee

iTrader: (3)

Hahah this is funny , i just took my stage 3 pulley off for the summer (heat) . To the person who said there is no differnece between stg2 and 3 pulley ,needs to ride in my car . You notice it down in lower rpm ranges , there is a difference . I went with the 2.99 because of IDC's , i didn't feel good about running a true 2.9 without a tune. In the GM stage 3 instructions they say it is fine to run the pulley on the stage 2 tune.

hungryhip-ccp

iTrader: (2)

yeah i know what you mean... almost like the a/c is on but not as bad... this is why i run just reg old stage 2 pulley during summer... and if you have supporting mods its not like the car isnt quick anymore, why waste the gas and put the extra un-needed rpm's on the blower internals... save pulley for the track or weekend racing...

schamsy

Well, since I already got the money to my paypal account, I'm gunna go ahead and have Nate custom make me a 2.95, well see how that works out. Otherwise big deal it was only $50. Least I'm supporting a vendor.

LopsidedJester

i think if you have a lot of supporting mods allowing for extra airflow then a 2.9" becomes a little too small, a 2.95" sounds like a good idea if you're going to try and max out your stage 2 tune without getting too unsafe. i'm sure a 2.9" will be fine as well, from what i see it isn't causing any severe problems, car is still running great and a bit stronger than stage 2 pulley.

I finally got hptuners and started logging and i see 120% idc at 7200 rpm, starts maxxing injectors at 6k (calibration is still a little off, i ask for 11.4, it gives me 10.8 afr). but, by the time i hit redline i'm seeing 12.2 afr and see almost 4 degrees of kr, it scares me that i've been running this setup for almost a year with less cooling mods than i have now.

SmOKe JeNsOn

Gonna check mine with a tech 2 in the shop I'm at approx. 4000 ft. I'll get back with you guys with results

Bika

iTrader: (3)

i said there was no difference between an aftermarket 3.0" pulley and stage 3.
stage 2 = 3.06"
stage 3 = 2.99"
almost 1 psi difference. still not a whole hell of alot, but potentially noticeable

schamsy

I am 40 ft above sea level. 2.95 should be nice.

Psykostevo

We try posting graphs and stuff for you guys, but then all of you claim you can't read them, so then I have to go into Microsoft Paint, and draw diagrams all over the freaking things like its MaddenVision!

hatrickstu

iTrader: (1)

lsjwannabe owning more nesayers, who would have guessed?

Mss26

well put me down in the "can read graphs" column i make useless graphs and charts all day for my bosses... and lol at MaddenVision

SSmoke1

Ok after hooking up the Tech 2 to my car oh this is Smoke Jenson BTW
here is what I have found dont know if this sounds right or not

PW-1.79ms @6k rpm
boost duty cycle- 99%DC
Knock retard 0%
air/fuel 14.7

What does this mean for you guys that know more about this then me? 2.90 stage 2

NexTnmE

iTrader: (3)

Yes, you will 'most likely' over max your injectors. Depending on where you are, ambient temps, mods...

I am at about 110% right now. The tech that tuned me asked that particuluar question. "Do you have a smaller pulley?"

If you wanna beat the **** out of your car, it's probably not the best idea to run 42's...its 'safe' because you wont blow up your car, immediately...

Bika

iTrader: (3)

doesnt tell me much. the injector pw and duty cycle says that you have maxed out your injectors before 6000 rpm. either you arent getting any knock, or the tech2 just isnt reading any.
god help you if your air/fuel is 14.7 at full throttle... but i think that is referring to idle.