for those who think the YS and YSI are too big LOL

[ystrim93gt]

I was about to sell my second YS trim for an S trim kit and I popped onto Vortech and Superchargersonline website for alittle Research, Vortech makes a YSI trim kit for a totally stock car:shocked: 4FA218-200 that is the part number for it, IT IS CARB LEGAL LMAO. It is their Super HIgh Output kit S.H.O. 4300.00$ Hmmm so not I am thinking about not selling it. Funny thing is they rate it to make more torque then an s trim LOL.

[regattacoupe]

Put it on and dyno it! Lets see some real world data. everyone in my town said the Novi 1000 was too small and i proved them wrong.

I doubt it'll out 'torque' an S-trim @ say 3500 rpm with the same pulleys to make the same psi @ 6000 rpms.......if you prove me wrong i'll sell my T and get a YS or YSI. I mean this post in a positive and serious manner cause i'm all about the upgrade and all i need is an excuse. ;)

welcome to our little corner of the web.

[ystrim93gt]

I will test it on my 93 gt, I have a YS trim when I put it on I will post up the numbers, My car is pretty close to stock, Gt-40 heads, B cam, Cobra intake. and I will try it with 8-10psi. I am just thinking WTF!!!! How can you put a YSI be CARB legal?!?!?!?!? Oh well we will find out, I didn't post this up for an argument just, as a hmmm post because Like myself there are a few of us that have been curious about YSI an YS trim on a somewhat stock car.

[regattacoupe]

WTF! Exactly!! It'll stop the bull or eliminate the bull either way you look at it.

[ystrim93gt]

I called vortech today about the YSI trim, it comes with a 6.87 crank and 3.33 pulley for 8-10 psi. It makes more low end torque then an s trim, because it flows more LBS per min at same and lower impellar speed. He said the blower will be fine and will still have the lower end kick you feel from the s trim. We will find out soon???? I am going to be upgrading my other YS trim to a YSI trim.

[regattacoupe]

Excellent!

[BLOWNBY]

I can post my YSi and S-trim dyno sheets if you'd like. Everything was basically the same between the dynos except when I went from the s to YSi I put and electric WP and Fan on it.

[ystrim93gt]

If you wouldn't mind posting, I would like to see the dyno sheets between the 2.

[BLOWNBY]

If you look in my images the YSi is there, for now I'll have to scan in my S-trim pulls.

[BLOWNBY]

When you talk to vortech you need to be carful who you talk too. Some I feel don't exactly know what is going on. Just think if it is bigger it's better. With those small pullies I believe the s-trim would be a much better option. The YSi is not a lazy blower however, it does need to be spun in it's efficient range at least. My s trim with 6.87 and 2.95 pulley and YSi with 8"& 3" setup is as follows.

S-Trim(6.87"/2.95") / YSI (8"/3")

2,500 ----330lbft /355 -----150HP /175-------2.50 psi /3.0
3,000 ----375lbft /385 ------200HP /225-------3.75 psi /4.25
4,000 ----450lbft /470 ------340HP /360-------7.00 psi /7.75
4,500 ----470lbft /525 ------390HP /460-------9.25 psi /10
5,500 ----490lbft /555 ------500HP /590------12.75 psi /14.25
6,000 ----475lbft /560 ------510HP /620------13.50 psi /16

Plus I went to electric fan and waterpump with the YSi. I had a little belt slip near the 5500 mark on the YSi. Top end that bad boy wants to keep going while the s trim was maxed out around 6,000. When I went to the 2.7 on the YSi it made very little difference until 4,000 then it made a good difference.

Hope this helps. The s would probably out do the YSi on my setup with the smaller pullies.

[regattacoupe]

Thats what I think. apples to apples same pullies, same motor, idle to 4000 rpms I think the S would win. Espicially if you have the 3"/8" in the S-trim.

The S would be in it's effiency range long before the YSI. No if you pulley them both in thier range then thats a no brainer.

[BLOWNBY]

Yeah if you look at it the S trim it is right there with the YSi pretty much till like 4500. After that you can see the YSi pull away. If you put the 6.87 on there then the YSi would probably be behind until 5,500. The YSi is definitly not designed for small pullies. It needs to be spun hard. Then it will "BLOW" the S-trim away. But for a low end street blower with only 10 psi or so the S-trim would be much better. :shocked:

[droptop1320]

Just for reference, I am still breaking in my new motor and I have a ys blower. With a 6.87 crank pulley and a 3.33 blower pulley I am making 6lbs of boost at 6000rpm :D. I am about to start turning it 7500 and see what happens then, but I know I need to get an 8in crank pulley and start from there. BTW, my motor is a 418ci/tfs-r head/solid roller setup.

[regattacoupe]

Just for reference, I am still breaking in my new motor and I have a ys blower. With a 6.87 crank pulley and a 3.33 blower pulley I am making 6lbs of boost at 6000rpm :D. I am about to start turning it 7500 and see what happens then, but I know I need to get an 8in crank pulley and start from there. BTW, my motor is a 418ci/tfs-r head/solid roller setup.

I bet with only 6psi I bet it's still pretty hairy. ;)

[droptop1320]

It did feel pretty good. I put the 7000 chip in the msd today and tried it out again. At 7000 rpm I am seeing 10lbs of boost. So I'm getting there. I still only have 18deg of total timing and the a/f is holding around 10.2:1 at WOT.