Littlefield

jstev4610

just logged my new setup

2015 5.3 with tvs1900, kooks longtubes and catted y pipe, carven catback. Stock pulley.

3.9psi

anyone know a real world psi gain from a griptec of the same size? The log doesn't look like I'm slipping so maybe nothing? I want to get it back up around 5.5 psi. If I get a griptec and pulley down .2, is that getting me where I want?

Vortec350ss

iTrader: (20)

If its the same size you wont see a gain.

Damn that boost is low!

flatblack83

Stock pulley tho meaning 3.4 or 3.7..? If I remember correctly... My old 1900 came with a 3.7 i had 4 psi, with the 3.4 I might of had 6.

I know my stock 6.0 to my 408 with a 2300 I see 2 psi in the difference. I had 12 psi, now see 10. That's with a grip Tec 3.2 8 rib.

Matt24

I have pretty much the same setup except I dont have cats. With a 87mm(~3.4) pulley I was around 5 psi. That was the pulley my tvs1900 came with. I pulley'd down to a 81mm(~3.2) and seen around 8 psi. Look at the back of the pulley, magnuson puts their sizes in mm. Ill sell you the 81mm if you want I went to a smaller pulley again.

jstev4610

I put Matt's 81mm pulley on, stock was 87mm. Boost is up to 6.6 at max, bigger change than I expected. Going to call it good here.

dantheman1540

Ive got Flatbalck83's old tvs1900 with a 3.4 on my stock 4.8 with long tubes and a LS2 throttle body. I also have a full length exhaust with NNBS muffler and resonator but I have a Cutout were the y pipe merges. With the cutout closed I see 6-7psi with the cutout open I see 5-6psi.

Got a griptech 2.8 coming this week. =D

dantheman1540

I was actually wrong before I thought I remembered the original pulley was a 3.4 it was actually a 3.7.

Just installed my griptech Level 3 2.8 6 rib pulley and I am seeing 13psi. Its a whole new animal couldnt be happier!

CHRGDUP_Denali

I have an 08 sierra denali 6.2 with a tvs1900 and 3.1 pulley (3.1 came with kit). When i first installed it, truck was completely stock with blower and made around 6psi. I now have 90mm TB, 1 7/8 longtubes, and dual 3" exhaust and boost dropped down to about 5psi. Wondering where yall think i would be at if I install 10% overdrive pulley and 2.8 blower pulley? hoping for around 10psi.

smokinlmm

I'm thinking of the same setup. Power bond overdrive crank balancer and pulley down to the 2.8 myself. Just thinking I should go ahead and go 8 rib trying to make 12 to 14 lbs...