Vortech V1 Pulleys??
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2.62 ? Your sure about that number? They usually go 3.25, 3.15, 2.95,2.75 etc with diff size crank pulleys and putting a smaller pulley on the blower over spins it faster to move more air . Remember boost is only a measure of restriction
the crank pulley size comes into play too but @84Ttop can give you specifics this is just the jist
Sent from my iPhone using my fingers while my auto correct makes me seem illiterate
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First things first, which blower do you have specifically? And you want to measure outside diameter of the pulley not any of the ribs.
What engine RPM do you run the motor to, how much boost do you currently make and how much power?
Use the impeller speed calculator here to determine your current impeller speed Impeller Speed Calculators | Vortech Superchargers scroll to the bottom of the page where it says v1/v7 (they have the same internal step up ratio and use the same calculator) Your target impeller speed should be 58,000 rpms and I caution you from exceeding that. You will need your upper and lower pulley diameters and your maximum shift rpm (6,000? I'm guessing) see where you are and play with different pulley ratios until you get to the target rpm, this will let you figure the pulley combo to spin the blower as hard as you can while maintaining a reasonable efficiency level. I'm assuming that you are using a 6 rib setup? If that is the case you need to watch for belt slip and may want to consider an upgrade to either 8 rib or a better tensioner with the pulley change. Vortech offers an 8" lower crank pulley (8 or 10 rib only) that is a good option to stay away from really small upper pulleys. The smaller the upper pulley is the less belt wrap you have around the blower and the more likely it is to slip
That was going to be my next post... I havent done anything to it. I just got this mustang a few weeks ago and all I have done is full suspension. The person that owned it before me is in jail. And for a very long time. So I cant ask what has been done to it aside from writing them a letter. But from what I can see it doesnt look like the upper has been modified. Just some shiny new valve covers. So. What I want to do is get a trick flow upper kit. But... From everything Im reading I am not sure if i should even do all of this because i am not sure if the block can even handle it? Some people seem to say the block will be fine as long as i dont got 500 plus hp. In all honesty I would be happy (I think) with 400+ hp when all is said and done. Do you think it is a good idea to do the upper kit and try and find the best pulley set up? And thank you for all the info. As Im pretty new to al this you are really helping me learn. Really like the forum..
58,000 rpm is not the gospel but is where they rate the blower as far as impeller speed. If you spun this thing 2k rpms over it isn't the end of the world it just lessons the longevity of the blower (and not by much, its where the bearings are rated) If you were to shift right on the rev limiter (6250rpm) you would see an impeller speed of 60526.32 with the above mentioned pulleys and that is reasonable in my book. If yo decide on a new top end and spin this thing this hard you have the potential to make serious HP so make sure the rest of the supporting components are up to par as well. Do you currently have a bypass valve on the discharge piping? If not you will want to install one if you plan on making more than 6 lbs of boost to prevent any compressor surge
I believe I have the bypass valve. I am going to upload a couple pics of what I think the bypass valve is and a pic of the setup. I dont know a lot about it. It just looks like they used everthing necessary. Because when I search the vortech site i dont see any parts that it doesnt already have
Looks to have a bypass valve so you should be good in that aspect. A few things to think about, custom tuning and removing the fmu if/when you put a new top end on the car (I saw another past asking about the TFS top end?) also as a maintenance item, remove the oil line and the nozzle to check for any debris and clean it thoroughly. The majority of failures that I have seen over the years have been due to clogged oil nozzles.
Looks like in the pics that you're still running a 6 rib blower belt on that sc-trim with a reeeeal small upper pulley. That's where your problem is. Your loosing boost because of belt slip.
You need to upgrade to an 8 rib pulley combo. I had an sc-trim on my Saleen and saw 11 psi with an 8rib 2.95"-6.87" pulley settup.
You need to upgrade to an 8 rib pulley combo. I had an sc-trim on my Saleen and saw 11 psi with an 8rib 2.95"-6.87" pulley settup.
I have a thought with the low boost, other than the probable slippage that is happening. How do you know this is an Sc-trim? It "looks" like it's been on there for a while, could be an A-trim? You'd have to remove the coupler on the inlet to tell but it's a possibility as they don't make much boost. Just a thought.
For what it's worth, I had the trickflow top end kit with an A-trim at 10psi, the car made 450whp/425wtq. A piston let go a few months later. Short block only had 75k miles on it. Could've been tune, could've been a "weak" piston. Just giving you my experience for reference.
For what it's worth, I had the trickflow top end kit with an A-trim at 10psi, the car made 450whp/425wtq. A piston let go a few months later. Short block only had 75k miles on it. Could've been tune, could've been a "weak" piston. Just giving you my experience for reference.
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