So I've decided to try and push the envelope of what the Vortech kit can do...I was originally going to do it Ysi blower, but that has gone to the wayside...

So I decided to go with overspinning my 928 impeller; I already hit the 500whp mark previously with the 928 impeller @ 60k rpm, but now I'm going for more...the rated limit of the 928 60k rpm, but Carl from 928 Motorsports spun the 928 up to 70k rpm with no issues; my current setup spins the impeller up to ~68k rpm, by adjusting the COG belt setup from 34/30 to 34/28 with my 2.75 928 motorsports jackshaft pulley (no slip @21 psi) and fluidampr 6.125 diameter crank pulley..

But first I need to upgrade in preparation for this....I previously ran the Spearco 5-312, rated up to 550 hp; I upgraded to the 5-364, rated to 650 hp...it's much bigger that the 5-312 and it was a major beeyotch to get it to work with the crash bar, in fact we had to modify the crash bar extensively to get it to fit...

5-364 vs 5-312


I also had to get a bigger bypass valve, decided to get the Mondo bypass Valve, good to 28 psi...and since it's so big and Vortech kit owners know its hard to find a place to mount it on the piping, I decided to mount it on the intercooler...it's even louder now than the standard race bypass valve...

Mondo bypass installed on intercooler


Fitting the 5-364 with the mondo bypass valve, major mods to the crash bar...


Tight fit for the bypass valve


Well, now I was ready for a tune (or so I thought ) and off to the tuner I went...

 

My first trip to the tuner was a fail...my then setup was a CJM Stage 0 fuel return (still using stock lines and rails) with RC 750cc injectors and Aeromotive 340 pump, and I ran out fuel @ 5500 rpm....I also decided to switch from my PMAS Maf (I tune with Osiris) to the Uprev MAF GT, and I was maxing that out as well....I was hitting ~19psi; when I was running ~500whp my boost was about ~17 psi...

So I decided to get a Treadstone 3.5" maf tube and updated my MAF piping to get it to work....that resolved my maxing out of the MAF...for the fuel I upgraded my setup to a CJM Stage 2 (rails, hardpipe) and 1000cc ID injectors....installing the Stage 2 was fun, particularly trying to get the fuel line up from under the car to the fuel pump ...Charles from CJM was helpful in helping me with the install, and also with the fuel gremlins that continued to limit me even after the Stage 2 upgrade....I ended up also upgrading my Aeromotive 340 fuel pump to the Walbro 400 (not as hard to do as you may think, thanks Hal and Dustin @ Dynosty) and also wiring my fuel pump directly to the battery...you have to remember that supercharger setups use a significant amount of fuel more than turbo setups because of the extra work the engine has to do spinning the blowers, particulalry at higher rpm and horsepower...and I finally got it working with with fuel to spare, maybe even enough for E85 if the future....maybe


And when I finally got everything right, I got this:



Just like the previous time I went to MD Automotive for a dynojet baseline, there was major slipping issues of the dyno roller and it took multiple tries and probably and lighter footing on the gas to get an accurate reading; the guys at MD do dyno testing for edmunds, so they may not be used to higher horspower cars, I can't help but feel my torque numbers should be better (my tuner uses a dynapack, but most people don't like that sort of baseline, so I decided to also get a tried and true dynojet baseline, and my torque is somewhat closer to the whp value on that dyno since there are no roller and tire factors involved)...

I was getting about ~21 of boost, no slip whatsoever...the revup bracket and pulley setup for the vortech is truly superior...


Anyway, it nice to hit the 600whp mark, but I can't help but feel a blower as big as the YSi can get even more power, if you can manage belt slip issues....I see perhaps the 700whp threshold being broken by the YSi, but I will be happy with my setup, particularly since my IPP Stage 2 engine is only rated up to 650 whp ...

Props to CJM, Dynosty, and as always Church Automotive for a great tune...

The bar has been set fellow Vortech peeps...so someone go out there at break 700whp (I'm talking to you, OldMan )

 

Great work and dedication! Glad your efforts yielded great results!!

 

vids?

 

I bet that is fun to drive!!!!
Got anymore pics of the car?

 

Great stuff and good job on the setup. With your new fuel setup, do you know what your IDC was at at redline? Looks like things are either starting to heat up pass 5k or are you starting to spin out of the efficiency zone?

 

Which blower do you have with the 928 upgrade? Nice numbers!!

 

Love the torque line with SC

 

very nice numbers man, congrats

 

Very nice and congrats!

Chris

 

wow, great numbers man, I bet shes a blast to drive. In for videos and final pictures.

 

sweet

 

awesome!! finally shining some light

 

very nice..i hope it all holds up for you..this is a great step for the vortech on the z im glad u went for it..

now go beat my time i ran at just over a measly 400whp..lulz

 

basically no room to grow (only 2.62 serp pulley), so thats probably all we'll see on this size supercharger.


I'd bet you lean harder on the timing though

 

very well done sir!!!!....good call on the dynojet base line as everybody would have ended up asking for it anyway....

 

I was there when they were tuning his car. I believe he made 650ish on the dynapak.

 

Cool! Solid numbers!

 

Wow great number man

I really wonder what your car would have done with the YSI blower.

 

Great Numbers, You are the Man to Beat......

Is this on 91 Octane?

What is youre Ignition Timing? Full Load and Redline?

TimRod