what size nozzle?

buickv6 · 04-04-2004, 12:02 PM

I'm running a DIY alky kit, stock turbo and a thrasher 92. I have a NOS style .028 jet, with 94 octane and turn on at 10 psi I can only get 19~20 psi. Should I try a larger jet? and what size?
94 and no alky I'm only getting 15~16 psi. I'd like a progressive controller but with a stock set up I didn't think I needed it.

salvageV6 · 04-04-2004, 03:38 PM

I'd try the McMaster Carr/SMC style M10 nozzle.

Or else something around .040".

You should be able to hit 21-22psi.

stevemon · 04-04-2004, 03:41 PM

Do you mean only 19-20 w/o knock? A hi-tech controller may not be the answer since even your 16 psi on 94 octane sounds low for a 92 chip. Is the IC heat soaked when you do those runs? Maybe a bad PVC is putting oil into the intake or the IC needs cleaning. Lots of variables as to why you aren't able to turn the boost up more.
But to answer your question about a larger nozzle, If you have the Shurflo pump, you can just turn in the pressure switch screw on top of the pump a turn and raise psi about 10-15 lbs.
Easy thing to try.

04-04-2004, 12:02 PM	#1 (permalink)
buickv6 Registered User Join Date: May 2003 Location: Alberta Posts: 582	what size nozzle? I'm running a DIY alky kit, stock turbo and a thrasher 92. I have a NOS style .028 jet, with 94 octane and turn on at 10 psi I can only get 19~20 psi. Should I try a larger jet? and what size? 94 and no alky I'm only getting 15~16 psi. I'd like a progressive controller but with a stock set up I didn't think I needed it. __________________ 87 Canadian T-top GN over built studded block,steel mains,wiesco pistons,206cc roller,ta61,57lb inj, pat's 10" 3200 converter,all controlled by a commander chip......... Shane M.

04-04-2004, 03:41 PM	#3 (permalink)
stevemon Free Information Kits Join Date: Sep 2000 Location: Jamaica Pass, Ok Posts: 3,906	Do you mean only 19-20 w/o knock? A hi-tech controller may not be the answer since even your 16 psi on 94 octane sounds low for a 92 chip. Is the IC heat soaked when you do those runs? Maybe a bad PVC is putting oil into the intake or the IC needs cleaning. Lots of variables as to why you aren't able to turn the boost up more. But to answer your question about a larger nozzle, If you have the Shurflo pump, you can just turn in the pressure switch screw on top of the pump a turn and raise psi about 10-15 lbs. Easy thing to try. __________________ stevemonroe@cox.net 1986 GN, 11.80 @ 114, stock turbo. Now in my God sons care. 1989 TTA #10, Sold 1967 Buick Spl. GS Clone, Sold 1957 Buick Special 2nd new Buick in the family (sold) 1950 Special. Families 1st new Buick. Got the Bling Grill 2006 Sissy Motorscooter DIY Alcohol Injection 62 mm Throttle Bodys Liberalism faltered when it turned out it could not cope with truth. D. Moynihan Some in my party threaten to send a message that they don't know a just war when they see it, and more broadly that they're not prepared to use our military strength to protect our security and the cause of freedom. Joe Lieberman Somehow liberals have been unable to acquire from life what conservatives seem to be endowed with at birth: namely, a healthy skepticism of the powers of government agencies to do good. Daniel Moynihan When we are planning for posterity, we ought to remember that virtue is not hereditary. T. Paine

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04-04-2004, 03:38 PM	#2 (permalink)
salvageV6 Registered User Join Date: Sep 2000 Location: Connecticut, USA Posts: 6,431	I'd try the McMaster Carr/SMC style M10 nozzle. Or else something around .040". You should be able to hit 21-22psi.