I have to replace my idler pulleys and was thinking of ordering the 3.12 vortech pulley. Would it be safe? considering i will get it tuned afterwards....thanks in advance- bobby

 

it's safe to use and like anything that adds any significant power, it needs a retune

 

Yes, I have the 3.12 pulley on stock internals and love it... I hit 9.2 - 9.6 PSI regularly on it and my car hauls a s s

 

did you upgrade your injectors too? if so, to what size?

 

No need to with Vortech supplied FMU. Unless you want to dump it for something more reliable.

 

No, I did not upgrade my injectors... I might in the future but as for now my AFR's are great. I am hitting between mid 13's to low to mid 11's under boost.

 

Dude - for FI you should be sitting right at about 11.8 all the way through. 13"s are hard man - you'll melt pistons soon if you don't get that down.

You might need to bump up the FMU disc to increase flow and re-tune.

Rick

 

I need to get my SS tuned to boost instead of RPM's since you can only tune to every 500 RPM on the SS...

I have over 10K on the Vortech right now and run 96 oct religiously.

I am due for a coolder weather tune within the next week so I'll have them check out the AFR's up top.

 

Triji's A/F is fine, I've seen his A/F chart. And the 96 octane solves any potential detonation issues. He knows what he's doing

 

I wouldn't trust my engine to that....good for you to speak up for him though...but I woudln't if I were you.

Octane or not...you need to richen the thing up a bit...hands down...especially for a stock motor.

Rick

 

the graph he posted a couple months ago was around 12 A/F from 2500-4000, then makes it's way down to 11 at redline

that seemed right to me

but then again, if it's leaner now - which it should be since it's colder outside, then i dunno

 

triji you guys have 96 octane in AZ? no fair...only 93 in TX unless you go to a fuel station with particular pumps for race fuel (100+ oct).

 

no we have 91 in AZ

there's some pumps that have 101 octane for like $5.49-5.99 a gallon

91 octane doesn't even truely meet the needs of a stock NA Z which was designed with 93 in mind. People can get safe tunes with it though, but you'll have to end up making the A/F richer anyway to do it

I drive my Z roughly 4000 miles a year now (wife and I currently have 4 other cars for daily driving) so I figure mixing in 50% 101 octane is costing me roughly $20-30 a month for cheap engine insurance. Hell I spend $6-9 just on lunch everyday so it's a no brainer to me

 

Even if you have a great tune and your car is running fine it wont for long. The VQ rods arent the strongest and in due time you will break them or something to do with them. Granted for the higher psi so you can pull harder in the begining I dont think its worth risking the motor for a few extra ponies.

Good luck!

 

I haven't heard about the vortech actually breaking many rods - lots of issues with pistons though as the culprit.

turbos seem to snap rods more often