For the last 5 years and 75,000+ miles, I've ran the vortech sc trim FULL kit with the 3.12 pulley. I have a co-worker that bought a 350z and a vortech kit. I'm going to help him install this and tune it. Figured give him the same 3.12 pulley and load my split second map into his car so dyno tuning would be short and easy. Turns out he got a full kit with the T trim blower.

Were still looking to use the full kit (fmu,booster pump,ss box and stock injectors) as it has worked great on mine. Does anyone know what pulley size for the t trim would put me in the 9 psi range? I imagine it will probably be the stock 3.33.

Thanks for the help

 

First off, sounds like your friend got a sweet deal on a T-trim kit.

I'll try my best to answer your question regarding pulley size... I like to think of PSI as a measurement of how inefficient your setup/motor is at handling/flowing the air being forced into it. Now with that out of the way, what you are aiming to do is mimic the amount of CFM's your setup was producing on your friend's setup. The way I would go about trying to figure this out is:

* Use the impeller speed calculator to calculate how fast you were spinning your SC blower (http://www.vortechsuperchargers.com/...d%20calculator)
* Assuming that Vortech's specified "Max Flow" happens at "Max Speed" (these stats can be had from the Vortech site as well), you can use simple math to figure out(roughly) how many CFM's your SC blower was producing.
* Likewise, using the above steps, you can find out(roughly) how many CFM's the T-trim produces (Make sure you use the right blower gear ratio.) By playing with the pulley sizes in the calculator you can find the T-trim impeller speed that most closely matches the CFM's produced by your SC-trim blower.

This should get you fairly close to the PSI you were seeing on your setup, +/- 2 or so PSI.

Hopefully, the above steps make sense. If there is a easier, or more correct, way to do this, someone else please chime in!

 

takes 5 mins to swap a pulley. keep making it smaller until you hit 380-400 whp. Boost number dont mean shiiit unless you are a ricer.

 

OK. So instead of coming to a forum that I've been a member on for 9 years to see if anyone has experience with a t-trim, I should just go buy every pulley possible and trial and error till I get it? Thanks for the excellent advice.

 

Is it the v1 or v2 t-trim? It makes a difference because they have different internal gearing. I had a v1 t-trim on my non rev and i believe the stock crank pulley with a 3.33 put me around 11-12psi, but it was hard as hell to get the belt on the pulley with it being so close to the blower. If its a v2 it should be a little higher psi, due to the internal gearing the blower will spin faster that the v1.

 

V1 straight cut gears (3.45:1 ratio)

V2 helical cut gears (3.61:1 ratio)

Also a V2 T-trim is not the same Blower as a V2 SC, SCi, Si-Trim conversion to a T-Trim.

 

Of course its trial and error. No one can predict the backpressure in your system. 3.33 pulleys have ranged from 6 to 11 psi. 3.12 have ranged from 9 to 15 psi. and 2.87 have been from 12 to 20 psi.

I would never run less than the 2.87 with stock rev limit. If you are bumping your rev limit start with the 3.12

Chasing boost number is stupid, as any 9 year veteran should know. chase 380 ft-lbs of trq

 

It's a v2 , thank you . Thats the answer i was looking for.

 

When have you ever heard of a 3.33 making 11 psi? im not asking ridiculous questions, why do you feel the need to give me stupid answers? and 9 psi from a vortech on a stock motor with plenum/exhaust mods will usally net you 375-400 on a sc-trim impeller.

Thanks again for your very knowledgeable input. Please no more advice its not needed or wanted...

I'm chasing the limitations of the ss box, fmu and booster pump.

 

Why?
I use the SS Box, I'm making over 500Whp.

Fmu and Booster Pump, well it's the whole Fuel System, with stock in-tank pump and stock injectors, is most likely Maxed out @ less than 375whp.

 

Mine is V2- T-trim 3.33 and produced 9psi.
Headers , High Flow Cats and Stillen true dual

 

thanks