[Beertestr]

9:1 forged 381 (0.020). NA it put down 322 at the wheels. Iron heads ported, peak at 280ish cfm. Mainly wondering if the pulley ratio is realistically a 10# setup or max output setup. Interweb reading has me thinking it's the max setup. Roughly 2:1 overdrive and 5:1 in the blower and 6000 rpm puts it close to max blower rpm.

 

[jking1118]

Michael,

I can measure/check my pulleys tonight, but that fuel system does sound WAY undersize. I am running the "8 psi" pulley setup on my bone stock LT1 with 1.6 rockers and good exhaust and was seeing 10 psi @ 6k rpm. And with 36 lb injectors, datamaster was showing 95%+ injector duty cycle. Based on 1/4 mile mph, I was making about 380 rwhp.

I am not sure how they came up with "18 psi" setup, but I try to think about the blower not as a pressure pump but a flow pump, which it actually is. If the engine flows better, then it won't build as much boost given the same blower speed. Look at Jeff Green's car. I think he is only running 15-16 psi, but making 1400 hp.

Also, does the setup your working on have a dual feed setup for the rails? That is a big deal IMO to keep from starving the last 2 injectors in line of the stock setup.

The stroker I had in my car, was run on "the 15 psi pulleys" made just north of 600 rwhp and was producting 12-13 psi boost. On the stock single feed setup he got fuel starvation and had to go to dual feed setup. It was also running on Delphi 50 lb injectors.

 

[Beertestr]

Thanks for the feedback Jonathan.. 72#/hour injectors and a Weldon pump/regulator are on their way. I jusy needed to convince myself that Combination shipped a........ sh!tty combination. Now that we hopefully have belt slip under control, let's see what 18# can do..

For the LTx Procharger guys, I'll leave this here...

 

[jking1118]

Is that groove side of the belt on a smooth idler just below the tensioner? Are y'all sticking with the same pulley combination you listed above? And I have to ask - which 72 lb injectors?

 

[jking1118]

Oh yeah, use a 88-92 Camaro V8 upper radiator hose. You need to trim about an inch off the engine side, but seems to clear very well and looks like it was made for the B-body with a blower right there.

 

[Beertestr]

Is that groove side of the belt on a smooth idler just below the tensioner? Are y'all sticking with the same pulley combination you listed above? And I have to ask - which 72 lb injectors?

I'm not doing the shopoing on the injectors, I just calculated the min we should need. Talk to Don.


Yes, smooth idlers on ribs. Not ideal but two of them were from the original kit, and the bottom one is one of the ones I sourced. I have not found a 12 rib grooved idler yet from the usual suspects OE suppliers, only smooth. I'm thinking of looking for a pair of grooved 6 rib pullies and making one. Minus the obvious trimming and a few minor tweaks, this is what we are planning on bringing to ATL.

Oh yeah, use a 88-92 Camaro V8 upper radiator hose. You need to trim about an inch off the engine side, but seems to clear very well and looks like it was made for the B-body with a blower right there.

I don't know if this is an fbody one, but this is what we mocked up. I am going to move the lower idler to the left a smidge and allow the tensioner idler a little more clearance to the hose.

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