Too small of a supercharger after dyno results

**JOHNGEAR** · August 11th, 2012

http://img42.imageshack.us/img42/968...ddzjoiptls.mp4Well did a dyno day to get the tune corrected(we did as the wide band shows a good flat A/F ratio) but the results did not end well.
436 wheel horse power and the supercharger was maxed out @ 4200RPM.
Vortech V1 with a 7" crank pulley and a 2.75" on the blower.
forged internally balanced Chevy 383(5.7 rods),15cc dished pistons, 76cc heads (large valves & ported runners),Holley stealth ram,duel 58mm throttle body,60# injectors,air to water inter-cooled.
Looks like I cannot get more than 6-7# boost.
This sucks but I think I am going to go a 88mm turbo now.
Was expecting more but I am told the V1 is doing what it is made for-600hp.
Please take a look at the tune and advise if you see a problem that could attribute to the restriction, thanks.
Dyno July 31st CCMR.tun ccmr_wot1.efi

**andysc3** · August 11th, 2012

Something is off. MY procharger with a 4" pulley makes 6psi at 5100 rpm and has much more to go. Im limited by my injectors so I cant go higher. I would do a boost leak test and see if your losing boost.

**Redline Motorsports** · August 13th, 2012

That makes no sense.... I would look for leaks first as well.

Howard

**andysc3** · August 13th, 2012

do you have any pics of the dual throttle body set up? also, with such a small pully, are you getting any belt slip?

**slow67** · August 13th, 2012

Originally Posted by andysc3

do you have any pics of the dual throttle body set up?

Probably this:
http://www.holley.com/112-503.asp

**JOHNGEAR** · August 13th, 2012

Great news!! It was a boost leak. Corrected it and now I see the gauge just peak past 10# but run out of road tonight.
Fast, pulls hard all through 2nd then into 3rd but no road to continue. Will need to contact my dyno guy and redo.
I will post some picks. Weird thing though, when launching from a stop, when it gets to the top of 1st, seems to putt and die(that's when I let off) but if I kick down, it does not do it?