JonnyC

iTrader: (19)

That would definitely be the much better way for me as a noob to this. But if I could get a Si trim kit for the same price as the SC, I'm just wondering if it's worth the risk (risk of unknown issues with the Si, and risk of simply pushing out too much psi - hah - do they make a pulley bigger than the 3.33? ). I like the idea of hitting the same psi as the SC with the Si, but having a little more boost throughout the rpm range (which I thought I saw you stating was the case).

However, I can also see me being one of the unlucky bastards to try a blower combo that has some major issues.

JonnyC

iTrader: (19)

Using my shitty and most likely mathematically wrong calculation, using Jet's 14psi using the 2.87 pulley, i get 12 psi for the 3.33.

2.87 / 3.33 = .862 * 14 psi = 12 psi! And kablam, it's that easy

However, his was at 6,600 i think, so if i set my rev limiter to something more like 6,200, it would still be above 11psi :-/

sentry65

iTrader: (11)

here's the thing, the nismo exhaust and stillen Y-pipe probably don't flow as much as some of these guys here who have headers, test pipes, dual exhaust, cams etc.

your psi could easily be 13-14 psi at 6600 rpms with the 3.33 pulley with Si-trim

and even if you limited your rpms to like 4000 rpms or where ever you hit 8 psi at, 8 psi at 4k rpms will be harder on the engine than 8 psi at 6600 rpms
IMO it'll just not be worth it

The SC-trim is probably going to be easier to get into and work your way up, especially if you're new to FI

str8dum1

iTrader: (11)

ya psi doesnt tell you much at all about the power your are putting down.

run stock exhaust with stock cats and sure you'll see hi psi, but HP wont be near the same.

so far 3 people have went to get the Si's tuned and so far 3 have no results (1 still waiting, 1 unable to properly tune bc of high AIT, and 1 blown).

Obviously the SC trim is the easier route. If you arent going injectors, walbro pump, utec or better, dual exhaust, hi flow cats/test pipes, possibly a meth kit/oil cooler, might as well stay with the normal SC trim. Its tuning path is proven and predictable.

JonnyC

iTrader: (19)

Thanks guys - makes total sense. I'll be sure to stick with the SC trim if i go Vortech. Sorry to inject some noob questions into this thread

Audible Mayhem

iTrader: (48)

we were seeing 16+ psi with the Si trim on justins car on 2.87 pulley. we changed to the 3.12 pulley and saw 12 psi up top.


the Si trim will be perfect for a stock motor to get more hp out of it...

booger

iTrader: (6)

I think your having some trouble with the belts due to the higher rev's , as someone stated already . The ONLY problem I had was at 13psi and above with the T-trim . And that was the belt slipping . I never had a slipping belt until that psi range . My belt was very very tight

JET MECH

iTrader: (2)

the Si trim will be perfect for a stock motor to get more hp out of it...[/QUOTE]

this may be a good thing for me. plus Sam mentioned something about the stock compression being better for this application. i am running 100 octane thank god...................

RBlover69

iTrader: (2)

JET ur sig has been killing me,...if it does not make you go faster OR handle better why bother! ....peace

JET MECH

iTrader: (2)

VERY VERY IMPORTANT!!!!!!!!!! what was your max rpm on the 2.87 pulley where you got 16 psi! same question with the 3.12 pulley. reason being is i am thinking of telling Sam to install the 3.12 pulley in place of the 2.87 i have on now. that sounds like way to much boost!!!!!!!!!!

OldManZ350

iTrader: (23)

are you saying that the stock motor can handle 16 psi if set-up and tuned correctly?

Audible Mayhem

iTrader: (48)

we were on a built motor. the blower moves more air per psi for sure. it would be perfect with a 3.12 pulley.

JET MECH

iTrader: (2)

seeing that unit has been rebuilt 4 times im wondering if this AIT problem is isolated to that one unit. Sam informed me during his pulls he did not encounter high AIT problems what so ever. that's weird? Sam was seeing 12 psi at 5500 rpm. i am a rev-up and possibly have more breathing mod's.I will just have to wait and see. supercharger should be going back on tommorow.

Audible Mayhem

iTrader: (48)

well thats great!! he got a new unit built for him everytime. so that cant be the case. i hope you have the best of luck and you are in good hands out in CA...



plus... we are putting a VK56 in justins car now!! hahaha

JET MECH

iTrader: (2)

that should be cool. I have a titan. the vk56 is a great engine. i hope you have the best of luck.

str8dum1

iTrader: (11)

so 16 psi on a built motor? Imagine 16 psi on the 5.6 motor.

was a dyno chart ever posted of those 16 psi pulls (in another thread maybe?)

sentry65

iTrader: (11)

yeah
16 psi on a 3.5 liter engine will be more like 10 psi on a 5.6
so 16 psi on 5.6 would be a ton of power

Barzten1

iTrader: (18)

Dont mean to highjack but I have a question that I want to get your guys attention on because I trust most oppions on this thread. I think my blower is going bad again (5th time) and I was wondering if I wanted to get a loan for a motor build is that something I just go to the bank for? I have tier 1 credit. What would be the best way to approach a loan for this. Sick of always worring about the motor life and sick of sending that blower back to Vortech. Want some new wheels too. hehe

sentry65

iTrader: (11)

if you own a house, you can get a 2nd mortgage line of credit. Interest is around 8%, but 1/3 of that you get back since the interest is tax deductable.

or can always apply for a 0% credit card that stays at 0% until 6-12 months or whatever, then goes up to whatever normal high %. If you have a 2nd mortgage, you can then use that to pay off the balance when the interest kicks in.

I've never gone into a bank for a flat out normal loan though, so I don't know much about that

Barzten1

iTrader: (18)

Thanks Sentry. Yeah I dont think I could talk the wife into getting a mortgage loan. I might try the credit card thing. They send me checks all the time for up to 8k but I always tear them up. Don't know what the interest would be.