I am jumping into the Vortech boat but have an AT. I was planning on going completely stock with the 3.33 but have read many threads on the AT upgrades (TC, VB and Tranny cooler). If I spend all this money on tranny upgardes...I am thinking of going to the 3.12 and justify the added expense. Question is...how less safe would this be on my engine/tranny/Vortech? I know some people have even gone to the 2.87 and have done fine. I also think the 3.12 lessens the warranty on the S/C itself. Any help would be great. TIA

ps. If I am waaaaay off base on this...let me know and I'll go back to reading threads...

Jason

 

Someone help this guy out. He's got until Friday to know which set up to buy.

 

Can't speak to the tranny mod's however I called Vortech recently to find out what the upper design limit on the blower was and he indicated 50k rpm with the max efficiency at 45k rpm.With the 3.33 pulley and assuming an engine rpm of 7100 the blower is rotating at 43.8k rpm. With the 3.12 pulley and the same engine rpm the blower is rotating at 47k rpm..Both are below the 50k rpm and the Vortech guy couldn't tell me what happens beyond 50k to the blower.. They just set the upper limit without any testing to determine any margins above it..As you have stated many are running the 2.87 which results in a blower rotating at 49k rpm..Everything seems to point to the Vortech operating in a safe range even at 7100 rpm..

 

subscribing

 

We have tuned several cars with the 3.12 pulley, if you have a good tune on the car you should not have any problems, another thing we have noticed is cars with full exhaust, headers, high flow cats, and intake manifold only see around 5 to 5.5psi. so going a pulley smaller with the 3.12 pulley with those mods your only seeing 8psi to 9psi. Another thing to keep in mind you also void your three year warranty from Vortech when you do use a smaller pulley. As for the tranny, I have seen the stock tranny hold that kind of power we have a 350z here with a Greddy twin turbo kit that is a automatic which is holding upwards of 400hp.

 

Vortech would have no way of knowing a smaller pulley was used!

 

There is a seal on each pulley with the 350z vortech kit, if the pulley is removed the seal is broken that is how vortech knows the pulley is removed, now you could say it was removed for other reason but it could still go either way.

 

How much rwhp and rwtq are these cars showing at 5-5.5 psi? This will help me to decide between the 2 pullies. TIA

 

Hmm I have all these mods and see about 8.2 psi. What do you think the 3.12 pulley would put me at??

 

which intake are you using?

 

I really think I want to do the 3.12 Pulley from the start.

My engine is completely stock and I would like to get the most power out of it from the get-go. If I throw on a 3.33 and only get 6psi, I am going to be bummed. Albeit, I have heard that I should see more Boost Pressure, but less actual HP because I am stock.

 

I'm in the same boat as you. I am completely stock and was thinking of going 3.12. After a talk with Neff about his...I came to the conclusion to start with the 3.33 (thus starting with the full 3 year warranty) and go from there. In about a year, that belt will need to be changed out anyway. At that point, you will have gotten used to the 3.33 power and want to upgrade. An upgrade at that time with a new tune will be like adding a whole new mod. If we go with the 3.12 now, we'll be itching for something else later on.

Also...when I go 3.12, I'll probably want some header/cat mod to relive some boost as I do not want to start getting into a boost war and bend my rods.

I hope this made sense....

Jason

 

<little kid throwing a tantrum voice>

FINE! Gosh...

</tantrum>

I agree with you, especially in my position not getting the car tuned, it would probably be wise to stick with the stock specs until I tune.

 

The stock VQ engine will not take any more than 350lbft torque before fatigue becomes an issue.

So long as that is not exceeded the engine should be reliable.

Paul

 

Good data point...where does it came from?? Thanks

 

One of the guys on the 350ZUK.com board has some good contacts with Japan.I believe this is good data.


Paul