bignmz04

Provided that all the other parts are the same. what is the difference in boost levels for the SCI, SI, 928, and the TI?

for example
IF i made 13.5lb of boost with a sci, much would i make with a SI and so forth, provided all the other variables are the same?

OldManZ350

iTrader: (23)

It not Boost that Matters, it's CFM

Everthing is listed on the Vortech Website.

The 928 is just slightly above the Si @ 1200CFM

Logiqal

iTrader: (1)

CFM is a better way of measuring but with our platforms, under the same conditions, there is about a 2psi increase going from a SCi to a Si. The Ti is kinda in a different category because it not only flows more air but can be spun faster due to the HD design that allows for better bearings. As for the 928, I really don't have much information other than what the manufacture puts on his website.

bignmz04

Thanks Tim and Logical:

I know the CFM numbers, but i was told by a few that i would see more boost from the SI upgrade. obviously, the CFM will be more with the larger blower, so that means that it will make more hp per the same level of boost? I was also told that I would see boost sooner, any truth to that?

I made 13 psi and 440whp on the sci with a fluidampr, 2.87 and 32 jackshaft pulley.

Only upgrades i made with the SI was 34 tooth jackshaft, and 7200rpm cutoff. We shall see what i make. Just trying to break 500. lol

OldManZ350

iTrader: (23)

You will see a nice gain by going to the 34 tooth and 7200rpm

BluestreamDE

Doo it!

meanz

iTrader: (23)

Si to Ti @17psi. 550hp vs 580hp. Nothing else changed except for tune.

BluestreamDE

Interesting, I thought the power jump from the Si to Ti would be more significant. Were you using the same pulley setup on both blowers?

meanz

iTrader: (23)

Everything else was the same. Same dyno and tuner. 30hp gain on same psi.

bignmz04

I guess the 17 psi came much sooner with the TI?

bignmz04

Just from switching the sci to si and putting on the 34 tooth, I made right under 540whp and 495lb of torque at 17 psi. this is using the same tune as the sci...i am sure i could get more with a better tune.

BluestreamDE

Mind Sharing the dyno sheet and your mod list with your Si upgrade? That's some pretty good gains even before fine tuning. I only plan on 13.5psi now with the 928 till I get a fuel return so by your numbers I should be at about 505-510whp with meth.

EDIT: Found a previous thread where you stated your mods. Disregard.
https://my350z.com/forum/forced-indu...l#post10813239

Logiqal

iTrader: (1)

That's awesome torque for our Vortech's. I wouldn't mind seeing a dyno sheet. Seems kinda crazy to use the same tune.

Logiqal

iTrader: (1)

I have to say I was really considering upgrading to a Ti but after seeing this, I'm kind of disappointed. I would of expected more. I may just keep my SCi. Thanks for sharing.

bignmz04

That was just to see. We tuned it after.

bignmz04

New updates include ppe headers, and full custom true dual exhaust.

BluestreamDE

Nice numbers with E85!

Man that's a sharp dive in power after 5700rpm on that run.

bignmz04

The blower maxed out, and i am on stock cams.

I have a buddy who did the same pulley setup (2.87, fludiampr, 34 tooth cog) and his dyno is very similar.

the dyno after tuning is much better and puts out more whp...torque stayed the same.

OldManZ350

iTrader: (23)

I don't think the blower is maxed out to cause that drop off in power.

Can you Post up your Boost Log of the same Dyno?

I bet you have Belt slip.

Logiqal

iTrader: (1)

Really nice numbers. Yeah, seems like your losing boost somewhere. The graph should pretty much be linear all the way to redline. You may be able to get even more peak HP!