ok im getting my car tuned sat, i have both a 2.6 and a 2.7 pulley im wanting what should i got with, what are the benifits and long term issues with being that close is there much of a diffrence.

mods:
(will be tuned by wickedss2005) injen intake, cx heat exchanger, meth kit, header, catless downpipe, ark exhaust, and lil stuff as in its lowered, short shifter, and wideband.

nothing

 

i would say since you have enough cooling mods to run either, its all about how high you wanna rev and what you want your power/trq curve to look like.

but i would get a dual pass too if i were you.

 

This is just my opinion but I personally wouldnt run smaller than a 2.7. My car was 2.7'd for 20k miles and I saw what it did to the engine.. granted my x wasn't running cooling mods so I give it credit for lasting as long as it did, driven the way it was... but a 2.7 is already over-spinning your supercharger, I feel like a 2.6 would be overkill.. Way out of its efficiency range as well. I know people do it but I personally wouldnt feel comfortable, even with cooling mods. With stronger pistons Id be more likely to consider it.. but I still wouldnt feel entirely comfortable with the supercharger generating that much heat, despite cooling mods. I still have a billetflow 2.7 in my garage that I probably will never re-install.. granted im running higher compression now..

 

The supercharger while down and 2.6 pulley size are putting out roughly 18# of boos the supercharger its self is capable of 29# of boost or 2.3 Bar something like that. Yes it will produce alot of heat but what issues did you notice on your car when you pulled the 2.7 Jazer?

 

If your gonna go down to the 2.6 then you should probably pick up a dual pass and option b just to be on the safe side and then you should be fine.

 

I had a 2.5 on my car for about 25k miles and no cooling mods....No problems with mine. I was smart enough not to do back to back to back runs. It pulled like a freight train when I added 100 octane and retuned it

Never got a chance to run it down the track with 100, but on pump, she turned 13.4 @ 108 for a 2.5, no cooling mods, header back exhaust, and intake. Imagine if it had a dual pass, front mount, meth, 100 octane, and ls4 throttle body? woo wee definately good for 12's no doubt

 

As far as my block...

I had BADLY broken ringlands on my #3 and #4, the blow-by was so bad it steam cut my cylinder wall, had a big gouge in it. My #4 piston was totally warped. My car was literally crying oil, it was blowing out of the dipstick and seeping passed the fender/hood/headlight, looked like it had tears streaming out of it.

I had to resleave my block & get 4 new pistons.

As far as the tune... the was no KR & the fueling was tuned via wideband and was accurate.

Nevermind my horrific valvetrain damage that ended the car's driveability, which I dont really blame on the 2.7, mostly from excessively being revved too high.

 

With a good tune you are better off with a 2.7.

I like how you say there isn't much difference between a 2.7 and 2.6, a .1 inch change in size is actually quite a big change.

I also agree, you should have a dual pass if you are running any pulley 3.0 inch or smaller. The stock 4 pass set up is not nearly as efficient at cooling as having it as a dual pass.

 

thanks for all the comment and i just picked up a opion b kit well really just made my own

 

all your cooling mods arent really doing **** without having dp.

 

Freight trains are slow? lol

Back on topic, is your car a daily driver? do you hptuners to do file swaps so you can change pulleys? Cooling mods alone arent going to be the best offset to the heat issue, stronger pistons like jazer said are just going to be a safer bet to have in rather than not having it.

 

People need to learn about Max RPM and Max sustained RPM. The 2.6 is fine to run. People need to stop whining and put up or shut up. Too much misinformation in this thread and it's only at 11 replies....

Ronnie, I'll fill you in on anything you need to know. But go 2.6

 

It's a figure of speach.

 

Driver abuse

 

Couldn't agree with you more....The people who blow their cars up with those size pulleys are because of 2 things: Bad tune, idiot who doesn't know how to treat a car and beats the living **** out of it every day. Like I said, I had a 2.5 pulley WITH NO COOLING MODS on for 25k miles with no problems. Everyone asked me how I didn't melt any pistons....it's because I didn't drive my car like a race car and was smart to know when to let off before it got too hot. (I would stop at a certain intake air temp)

 

exactly i just clocked 52k miles on mine. I have had a 2.7 on the car since she was at 1200 miles. I had only a cobra HE plumed in line with my factory. I have a full vibrant header and downpipe combo with cat delete, and a GMP performance exhaust. On street tires i turned a 13.3 @ 107. i am still running that combo and am a certified tech that has his car in the shop all the time. The only thing i need to do to my car is an upgraded clutch because she cant hold the power anymore.

 

Did you guys need any upgrades on your mounts? I am just wondering about blowing my engine. I am about to install my zzp header and dowpipe with high flow cat. Hahn exhaust. I have zzp pcm, shorter belt, 60lb fuel injectors, 2.7 inch pulley, stage 3 h/e, dual pass with option b. I take it im pretty safe to install. I also baby her =D

 

i made 10 whp difference between the 2.7 and 2.6 with no cooling mods.no to sure what the difference in the tunes were because i didnt know the old tuner that well.but i did go through 3 blowers, first on a 2.7, then on a 2.6, and then again when i ran a 2.6/2.5.i replaced a blower about every 30k miles.i also beat the **** out the car to though.