Boost Calculation

[Viper_ed]

Anyone know of a forumla to ballpark boost numbers with pulley diameters for a Vortech V2 S-trim? Got a 6.87" crank pulley and a 3.47" S/C pulley on a 302.

[Martin0660]

ballpark

<1 & >30 Big ballpark :D

[Rodeheaver's]

not real sure Ed, that sounds like a low boost configuration to me, i think the stock crank pulley for that kit is a 6" and a 3.33 blower pulley and they only make 8-10lbs usually.. And I cant remember were to find a calculator!?!?

[Viper_ed]

Yep, Vortech just confirmed on the phone that the base kit has a 6.87 Crank and a 3.33 S/C pulley. I need to figure out what combo will put it around 14-16 psi on a 302 w/ H/C/I.

[Pure Stock]

6-7 lbs. with that combo.

[yeahloh95]

do you have a power pipe that is worth another 2 lbs on the stock pulley combo and whats this n/a guy doing repling? lol

[349Stroker]

Yep, Vortech just confirmed on the phone that the base kit has a 6.87 Crank and a 3.33 S/C pulley. I need to figure out what combo will put it around 14-16 psi on a 302 w/ H/C/I.


made 15-16 with a 2.96/6.87 and powerpipe

[wick]

That combo will give you about 7 or 8 psi. Get a 2.90. That will get you closer to 14. Or get an 8" lower from ASP (arts parts)

[pRojekt02GT]

and whats this n/a guy doing repling? lol

:rofl:

[Rio94gt]

With My GT40s, 6.87 crank, 2.95 blower, and AFM powerpipe mine made 15 psi Ed.

[Pure Stock]

do you have a power pipe that is worth another 2 lbs on the stock pulley combo and whats this n/a guy doing repling? lol

Natural aspiration is like Viagra, it's for those who can't get it up UN-naturally:greedy:

[wick]

With My GT40s, 6.87 crank, 2.95 blower, and AFM powerpipe mine made 15 psi Ed.

All combos are different. Just goes to show how better heads will do. Boost is "restriction" basically. With my 6.87 and 2.90 I am only seeing 13.?. Its all different. Mind you, my intake is ported and the heads mate to a 1262 gasket. Its all different.

[Rio94gt]

Exactly. :thmbsup:

Ill be spinning that S-trim with all its might to feed my 408W haha.

[wick]

Put the belt right on the shaft!!!!1 HAHAHHAHAHAHAH

[gmkillr]

"Boost" is a measurement of backpressure.

[wick]

All combos are different. Just goes to show how better heads will do. Boost is "restriction" basically. With my 6.87 and 2.90 I am only seeing 13.?. Its all different. Mind you, my intake is ported and the heads mate to a 1262 gasket. Its all different.


"Boost" is a measurement of backpressure.

Like I said here. Restriction.

[Viper_ed]

do you have a power pipe that is worth another 2 lbs on the stock pulley combo

Yes Troy, there is a AFM Power Pipe with this setup as well.