demonspeed

iTrader: (7)

I say empirically loosely

More details of last evening's track outing here: https://ls1tech.com/forums/17401574-post64.html The entire build thread is in my sig.

10/13/12 - FRA, no filter, lid, ported TB, muffler:
1.99, 8.33 @ 86.8, 12.84 @ 109.4 with a 576 DA (launch @ 2200)
5/14/13 - FRA, Airaid filter, lid, ported TB, muffler, and pulley:
1.97, 8.32 @ 86.8, 12.82 @ 109.7 with a 1376 DA (launch @ 3000)

Corrected (using http://www.dragtimes.com/da-density-...calculator.php ), that is:

12.78 @ 109.8 vs. 12.62 @ 111.3

800rpm difference in launch and added a filter, so infer what you would like...

Midnight02

iTrader: (8)

The corrected numbers would seem to clearly indicate there's a real gain to be had from the mod. I think it's a no-brainer to take care of this while doing a cam swap. Quick, easy and relatively cheap HP.

Are you using the 25% U/D pulley?

demonspeed

iTrader: (7)

Yes, I believe the pulley is advertised as 25% underdrive. I immediately noticed a significant difference in how quickly the engine revs compared to previously. As my lengthy post regarding the track states, it's really made it a bear shifting at high rpms with stock hydraulics. Nonetheless, it appears as though it's a worthwhile mod.

Granted, an UDP is nothing new, but I see many people with internal engine mods not mentioning a pulley in their parts. I figured the consistency in my track times really show what's to be gained

bene

iTrader: (16)

Nice results.