Vortech set up, V2sq, S/C pulley 28 tooth, jkshft 32 tooth, with a S/C pulley @ 2.87". I know that this will spin the blower @ 58483 rpms, via (vortech web) @ engine rpm 7100. Vortech specs. show blower ia rated to 50k. My question is will this blower hold up under these conditions? Boog, I know you are in for a blower upgrade. Is this what caused that blower to fail? I have done past serches, and have heard that Vortech under rates max rpm rates, but to what extent?
Granted Im not going to be @ 7100 engine rpms for extended peroids of time.
Help please!!
__________________
Kevin Gilman
kevinapex@peekanet.com

 

There are several guys running that pulley set up with no harm [ yet] to the blower. I think several guy have had thier seals go bad , including my self . This causes oil to be sucked into the blower and into your intake system. I dont know if all the seal failures are guys that have went to smaller pulleys

 

Bill,where do you stand now, hine sight 20/20.
If you were in my shoes would you re-build blower before failure? or spend 56.00 for pulley, and dyno time and wait for smoke?

Any other input from Vortech owners with this set up?

 

I have the 2.87 pulley and but limit my boost to 8psi via a wastegate. The theory is that the extra psi's are too much for the intercooler to cool, and it's too much strain on the blower. The blower is spinning at 5X,000 rpm but it's not producing 11-13 psi like it would if it was a sealed system. The limit to 8psi also keeps the fuel pressure to around 100psi. If you go to 11-13psi you will be jamming about 150psi of fuel in your fuel rail. I do get some oil deposits in my intake track that make it all the way to the plenum. My seals maybe be weak, but people also say that since the engine now forces air you get blow back of oil. This is why most FI cars have oil catch cans. The reason I say 11-13psi is that the 2.87 pulley will spool up very fast, and near redline you will be over 11psi, 7000rpm is near 13 psi. PM if you want details on this safer alternative.

 

Before I sent the blower in to have it upgraded . And had on the 2.87 and the 34 tooth cog pulley . I saw 11psi at 5,800rpm . And if I would have gone to redline , the blower would have been spinning at almost 60,000rpm . I think unless your going to do some thing like gspot35 did [ wastegate ] the blower isnt going to last very long with the 2.87 on . And your motor will be lucky if it last very long either ....my .02
Now ,with the T-trim and a built motor . I get 11.5 at 6000rpm . I havent taken it up to redline yet , but hope to get 14 psi . The T-trim makes just as much psi as my last set up [ 2.87 and 34 tooth ] with the 3.12 pulley on .

 

Do you have any info on what wastegate you used and how you did this?

--mike

 

wat he said.. ^^

thanks!

 

I am confused as to why you want to over spin the blower to 5x,000 and limit the boost to 8psi when the stock blower produces 8 psi at lower S/C rpm with the 3.33 pulley? Does it produce 8psi at a lower engine rpm??

 

It's a 35mm Turbosmart with an 8psi spring installed. Why use the pulley? My boost comes on so much faster. Dramatic increase in mid-range where the engine produces torque. So my hp numbers are different than guys with 8 and 9lb pulley's. TQ numbers will be in the 350 range for a 6speed. It translates into 8psi around 5000rpm and remains the same until redline. 8psi is a good amount of boost for this motor and setup. You really need to change injectors if you go passed 8lbs-9lbs.

 

...

 

can you tell me where you got this "wastegate"? if you have a link it would be awesome

 

try overboost.com. I bought mine from a friend. It was a Turbosmart 35mm wastegate with an 8psi spring.

 

As gspot said... to get the boost at an earlier rpm. I switched to the 3.12" pulley for this reason (though, I'm not running a wastegate... yet ). I was happy with my peak numbers, but I wanted that power to arrive earlier in the rpm range.

 

In this situation, Kevin is running a complete return fuel system, and an eManage setup with larger injectors, pump, etc....so his fuel pressure will remain normal. 52psi of differential fuel pressure all the way through.

 

Kevin...What did you end up doing...2.87 pulley ?