Vortech G-trim users
Originally Posted by Crunch
Well, my dyno graph shows that my setup still makes horsepower above and beyond 6K RPMs.
In fact, when I spun to 6600RPMs, the power started to increase almost exponentially, like it hit nitrous or something.
We'll play with this some more. I think there's another 30-40 horses in there somewhere.
In fact, when I spun to 6600RPMs, the power started to increase almost exponentially, like it hit nitrous or something.
We'll play with this some more. I think there's another 30-40 horses in there somewhere.
John, I thought you were talking about compression ratio. I know 16:1 air fuel is bad. It is the reason I had to replace a piston this weekend. With the nitrous the air fuel was about 16 to 1.
Crunch. What pulley are you running?
Originally Posted by Pro Stock John
M6 will outdyno an A3.
Let's see what you also run at the track.
/highlander
Let's see what you also run at the track.
/highlander
Just pulling your chain.
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Originally Posted by 30thta436
Chris: it was 101 octane.
Vince: my setup is in the sig for the most part.
The bottom end is stock except for the hardened rod bolts and clevitte rod bearings. The heads are stage III locally ported and polished. They didn't flow that great. I think they flowed 280ish. With the 2.75" pulley we were seeing 576RWHP at 13psi before the heads. We put the heads on and gained no power but the boost dropped to 9. Now with the 2.5" pulley boost went up to 10psi.
I think the rest of the cars mods are in the sig.
Vince: my setup is in the sig for the most part.
The bottom end is stock except for the hardened rod bolts and clevitte rod bearings. The heads are stage III locally ported and polished. They didn't flow that great. I think they flowed 280ish. With the 2.75" pulley we were seeing 576RWHP at 13psi before the heads. We put the heads on and gained no power but the boost dropped to 9. Now with the 2.5" pulley boost went up to 10psi.
I think the rest of the cars mods are in the sig.
Thanks for the explanation. It makes more sense now. Congrats!!! You have one stout setup..
Compression ratio is basically stock. The heads were milled .0030. But I used .0030 thicker head gaskets.
Thanks vince. We are going to redyno on DEC. 20th. We should have the icebox on it by then. Hopefully we will hit 650.
Thanks vince. We are going to redyno on DEC. 20th. We should have the icebox on it by then. Hopefully we will hit 650.
TECH Enthusiast
Joined: Aug 2003
Posts: 596
Likes: 0
From: Downers Grove,IL
I say spin the blower as fast as possible for your intended rpm range.
70,000 rpm is where I draw the line. That's what the bearings are rated at for a max speed from what I have read.
The 2.5 pulley really wakes up the midrange power. I run my car with about a 1500rpm window.4600-6200 at wot.
Pulls great.
My Unit still seems as tight as when new and leaks no oil.
I don't think Vortech even knows these little G-trims can support this much power. They only rate it at 600 Flywheel.
This blower is pretty peaky. Spin it at 45,000 rpm and it's pratically useless.
Spin it to 60,000 and it wakes up and begins to work well.
Spin it another 7500rpm and it is flowing real well.
30thta436, Great job! Careful of those stock pistons though. I had cracked the 2nd ring land and did not even know it, until it began to colapse on the ring and killed compression.
Steve
70,000 rpm is where I draw the line. That's what the bearings are rated at for a max speed from what I have read.
The 2.5 pulley really wakes up the midrange power. I run my car with about a 1500rpm window.4600-6200 at wot.
Pulls great.
My Unit still seems as tight as when new and leaks no oil.
I don't think Vortech even knows these little G-trims can support this much power. They only rate it at 600 Flywheel.
This blower is pretty peaky. Spin it at 45,000 rpm and it's pratically useless.
Spin it to 60,000 and it wakes up and begins to work well.
Spin it another 7500rpm and it is flowing real well.
30thta436, Great job! Careful of those stock pistons though. I had cracked the 2nd ring land and did not even know it, until it began to colapse on the ring and killed compression.
Steve
wow i've been using the 2.85 pulley, i have the 2.75 sitting on my tool box. i guess i'll slap it on and do some before and after dyno sessions with it. im only seeing about 7lbs of boost. my compresion is 9.1 to 1. and im running a lil 216-220 cam on a 114. with the new heads i want to bring the compresion up to 9.5 to 1 and i still am undecided on which cam to go with. i dont want to loose too much boost.
These are awesome results. I'm digging that torque curve; comes on early and only gets better. Makes me think vortech over ATI, especially since the vortech has a CARB #. Does anyone know what these power figures would be corrected to SAE?
30th, have you had any issues on the cometic gaskets leaking? Also how did you install them. Did you use the copper spray and the coolant additive? Any info would be great.
Thanks,
Glenn
Thanks,
Glenn
Originally Posted by W8N2SQZ
30th, have you had any issues on the cometic gaskets leaking? Also how did you install them. Did you use the copper spray and the coolant additive? Any info would be great.
Thanks,
Glenn
Thanks,
Glenn
I have the same supercharger with the aftercooler on my car. I have a 2000 trans am ws6, Everything done by MTI I have a shortblock with all forged internals at 9:1 compression,stage 2 heads,headers,cam,titiam valves,exh,30lb injectors,dyno tuned,mcleod clutch,and so on. I was running 6-7lbs of boost on the stock pulley but I wanted to run more boost so I changed to a 2.87 and only gained a 1lb of boost then I put a 2.75 on and now I am running 8-9lbs I thought about going to a smaller pulley but I dont want to over spin it I want to make 11-12lbs of boost. I had my car dynoed about a month ago went 510rwhp 496lbs of torque but started leaning out around 6grand the tune was almost perfect until then so I bought a set of 42lb injectors I am about to install do you think I am maxed out or can I get more boost out of it...