I've decided to wait till summer when I have enough money to rebuild my motor with forged rods and low compression pistons.

What size of pulley can I run with my vortech supercharger and what is the max boost I could run with it on a low compression set up with a supercharger cam?

Planning on running 9:1 compression and I have a Vortech 9# aftercooled kit.

Will I need bigger injectors, fuel pump ect...anything different than what came with the kit?

What could I do to keep the belt from slipping or the pulley from slipping on the crank? Will I be able to get over 600rwhp with this set up? This will be a daily driver/summer track car. I want to get the most I can for the money that I've spent, but I don't want to blow anything up.

 

I just finished having this same kit installed in my car. I still have the stock bottom end. I had the same concerns as you, but I went ahead and installed the blower ontop of the heads and cam anway. If/when the bottom end goes south, I'll drop in forged pistons, rods, and bolts. But I just couldn't see ripping apart a perfectly good motor when many folks have been running this kit for years on the stock motor with no problems.

The smallest pulley for the V9 G-trim kit is the 2.75" pulley. On a stock motor, it should be good for 13PSI. On a heads & cam car, it will only be good for about 9-10PSI. Use the impeller speed calculator on Vortech's website to keep from overspinning the head unit. If you go over 550RWHP, I would think about getting the Walboro in-take pump on top of the T-Rex inline. I would also probably step up to 42lb injectors. With the smallest pulley, and high flow heads and cam, and headers, I think you should be good for around 575RWHP, which according to Vortech is the maximum output of the V9 G-Trim kit.

 

I was told I would probably be over 500rwhp with the Vortech 9# Aftercooled kit, supercharger cam, and headers.

Do you mean I could only get 70-75 more hp out of it from rebuilding the motor and using the smallest pulley? I was hopping to at least gain 100 hp. I would like to be between 600 and 650 rwhp.

So..its use what I have and be around 500rwhp, or spend another $3000 and be around 575rwhp? What about using a small shot of nittrous with the forged internals and the smallest pulley?

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Black01M6SS:
I was told I would probably be over 500rwhp with the Vortech 9# Aftercooled kit, supercharger cam, and headers. </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Absolutely. A blower cam and headers with that kit should put you right at 500RWHP.

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Do you mean I could only get 70-75 more hp out of it from rebuilding the motor and using the smallest pulley? </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">That is also correct. Remember, the limitation is not your forged motor, but the blower head unit itself. The V9 G-trim is relatively small unit that only flows a maximum of 800CFM, with a maximum impeller speed of 65,000 RPM. It was originally designed for sport compact / import cars and was never meant to be a true "all-out racing" small-block V8 supercharger. Its just that there ain't much room under the hood of an LS1 engine bay, and so unfortunately, this is the head unit they picked for this car.

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">
So..its use what I have and be around 500rwhp, or spend another $3000 and be around 575rwhp? What about using a small shot of nittrous with the forged internals and the smallest pulley? </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">If you need more than 575RWHP, you can spray a wet shot, or upgrade the head unit. Upgrading the head unit will require additional brackets and other hardware which I'm not familiar with. Check out a guy named "30thta436". He's on this board somewhere, and he had the same problem.

 

This has me rethinking rebuilding my motor. $3000 seems like alot of money for 75hp when you already have 500...

With a good dyno tune would I have any trouble in 110* heat with 500rwhp on motor with 55,000 miles?

If something did go wrong wouldn't it mess up the block and everything? If it was as simple as replacing a piston when one of them went bad I wouldn't be so worried about it, but a hole in the block would be a little different.

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">
If something did go wrong wouldn't it mess up the block and everything? </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Nine times out of ten, the first thing to go is the #7 piston. Either it cracks, or you lose a ringland. In the vast majority of cases, there is no physical damage to the engine block, only the pistons. If in the rare case that a piston actually scrapes or scratches your engine block, you can easily get another shortblock for around $500. So just figure in the worst case scenario, you'll have to tack on another $500 ontop of the $3000 you mentioned earlier.

But if you stick with the 3.125" pulley that comes with the kit, your motor should be fine for a long time. Just stay off the throttle until you need it and be sure to get your PCM programmed by someone with LS1-edit on a dyno.

Remember, the V9 kit was designed and engineered within tolerances that make it reasonably safe for street/strip use on the LS1 V8. If every kit blew up the engine after 6 months of use, there's no way it would have ever made it out of the Research and Development stage.

Have a little faith, dude, but at the same time keep a little cash in the bank for the bottom-end rebuild down the road. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

 

The reason I'm so afraid of the motor blowing is because I do not have the $3000 it would take to rebuild it. If I started saving everything I could I might be able to get there by this summer, but I do not have the money on hand.

I was saving up for some heads and a cam when I got the bright idea to supercharge it. I ended up spending twice my planned budget and I don't have the money to get the suff installed or tunned right now. Basically I'm broke and having to look at all this stuff I have. I want more power, but the thought of having to spend any more scares me. UNLESS I could get alot more HP lol.

 

OK, dude. Let me break it down so you can understand it. The words "forced induction", "money", and "rebuild" are always used together. For example: If you don't have the MONEY to rebuild your MOTOR, then don't f*ck with FORCED INDUCTION. <img border="0" title="" alt="[Mad]" src="gr_images/icons/mad.gif" /> Plain and simple.

It seems to me you should have had this conversation with somebody long before you bought that blower. But since you already have the blower and the cam, my advice is to have everything installed, and IMMEDIATELY begin saving up for an engine rebuild. If you put away $100 each two-week paycheck, you'll have that in a little over a year, which is about how long it will take to blow up that motor if you beat the living crap out of it. It will last longer if you drive sensibly and get a good tune.

Best wishes, dude.
I'm outta here. <img border="0" alt="[burn out]" title="" src="graemlins/gr_burnout.gif" />

 

I've already seen that forced induction cost. I have about $8000 in it already. I don't mind saving the money, I just want a good gain for my money. Right now I can only save about $500 a month and was planning on rebuilding my motor before I installed anything. I was just didn't know I would only get 75 more horses when I did. Seems like a waist to me. I'm probably just going to install everything and hope for the best. "While saving". In no way was I trying to make you mad and I appreciate your help.

This car is my daily driver and gets the hell run out of it every weekend. I could have the money to rebuild the motor by mid summer, but if everything was going good and I had the money I would probably want to spend it on something else.

 

Money isn't always spent to gain horsepower. Things like a 12 bolt rearend, built tranny, larger radiator, and BUILT MOTOR are insurance measures. Putting stronger stuff in your bottom end shouldn't be done with the expectations of gaining 200hp, just b/c it costs so much money. If you were going with big cubes, you'd be gaining more but you'd also be spending more. You keep repeating the fact that you don't want to spend the money if it's only gonna get you a few ponies, but that's not the point of the built motor. You pay big bucks for forged internals so that you can continually use the horsepower you'll already have with that blower! I think this is the point that Crunch is trying to get across.