moddedta

i just purchased a vortech v9 g trim kit for my car. I'm trying to figure out what pulleys to run to achieve the maximum rpms on the headunit. I'll be shifting at ~6,500rpms

LSpeed1

iTrader: (2)

i have the exact kit that you are talking about and to be honest, i cant imagine shifting at 6500k rpms.
my limiter is still at 6k which seems like enough.
im running the 2.75 pulley seeing 8-10 pounds of boost.
hope that gives you some insight.

Inspector12

iTrader: (29)

I used to run a 2.65" pully and then I swapped to a 2.5" pulley. I prefered the 2.65" pulley made 601rwhp with it and shifted at 6500 peaked around 6-6200 so it was the perfect place to shift it etc...

moddedta

Ok. What psi were you running with those 2 pullies? I have alot of port work on the heads and have lt's. I'm just trying to get 9 psi with those mods

moddedta

ok, i just did the math. you were using a 2.65 and a 2.5 pulley?

2.65" = 66,410
2.5" = 70,400
this is assuming a 3.61 step up ratio for the v9 g trim from what i have read.

They say the max rpm for that headunit is 52,000. How the hell didn't you blow it apart? Did it really last that long at that rpm? I read that the peak effeciency for the blower is at 48,000rpm. With the math that means I should be using a 3.5" pulley. I would really appreciate your input on this as I am about to order the last remaining things for install.

Also, if anyone has the ati damper I need to install the v9 kit please let me know.

Inspector12

iTrader: (29)

Yeah I had a set of TEA 317's flowed 318cfm on the intake if I remember correctly. 224/230 114 cam and Jet hot 13/4" headers made @9lbs in summer and 12 in winter with the 2.65" pulley. I don't remember what boost it made with the 2.5" pulley 12lbs??? I think. And I never had any issues with the blower. I think your math is off cause I was just barely overspinning the blowe with the 2.65" pulley up top and a little more with the 2.5".Call Vortech and ask them about the RPMs etc... Vortech has a specific number for there version of the ATI balancer, but I think you could get away with the standard one and vortechs drive pulley. GL!

ss1

iTrader: (32)

Off the top of my head, the max recommended impeller speed for the V9 G-Trim is 65,000 RPM.

I see just over 7psi with a 2.65" pulley, ported 241 heads, 222/230 cam, 1-3/4" headers, and dual 3" exhaust on an otherwise stock LS1.

moddedta

and you made the horse power numbers in your sig on that pulley? I cant wait to get mine on and tuned. I made 470whp all motor. I'm really hoping for 600whp with the v9

moddedta

are you guys sure about the 65,000 rpm max? I called vortech earlier and they told me it was 52,000. as far as I can tell, all of my math is correct unless I have the wrong size crank pulley. Anyone know what size the crank pulley is that comes with the kit?

ss1

iTrader: (32)

I went to the Vortech website and it does say 52,000rpm. I'm not sure when this changed, but I'm positive it was previously rated up to 65,000rpm.

The crank pulley included is 8.00".

moddedta

ok, i have a couple more questions for you guys. at what rpm are you starting to see boost? are you running a sd tune, and if so what did you put in place of the maf in the intake tract? and what size belt are you running with the 2.65 pulley? i think that is the one I'm gonna go with.

moddedta

so where are you guys buying the 2.65" pulley? right from vortech or is there a place with better prices?