rdavid0412 Posted October 30, 2012 Report Share Posted October 30, 2012 I have some questions about the LQ9 and its tolerance so here it goes- What is typically the HP breaking point on a completely stock LQ9? How Much boost is safe to run without sacrificing power? 8-10 lbs? More? When is it reccomended to do Head Studs and or Rod Bolts? Quote Link to comment Share on other sites More sharing options...
shawnss Posted October 30, 2012 Report Share Posted October 30, 2012 (edited) Oh wow its a tuff call. there have been guys that make crazy power on a stock LQ9. it really comes down to a good tune at the end of the day. I have ran 12psi and a 65 wet shot on a stock motor. Im not sure how far i'd push the stock rod bolts. i have heard they can be a weak link to a bottom end. what fuel you want to run? I have also smoked a stock motor on 9 lbs of boost. so it just really depends. Edited October 30, 2012 by shawnss (see edit history) Quote Link to comment Share on other sites More sharing options...
rdavid0412 Posted October 30, 2012 Author Report Share Posted October 30, 2012 (edited) so far all i run is 93 no race gas or anything like that I want to keep it simple. What do you consider "Crazy HP?" Edited October 30, 2012 by Full Circle (see edit history) Quote Link to comment Share on other sites More sharing options...
canadianVRss Posted October 30, 2012 Report Share Posted October 30, 2012 If your tune is bang on you'll probably never touch the HP potential of the LQ9. Even with that P1. I've talked with a few guys at Castrol raceway with stock LS variants under 10+ psi and it's amazing what GM has created. It makes the hair stand up on the back of my neck to think that a stock engine will twist the chassis before it'll twist the crank. Considering it became widely avalible in 1999 makes me wonder how other brands even survived! Quote Link to comment Share on other sites More sharing options...
KrausMotorSports Posted October 30, 2012 Report Share Posted October 30, 2012 Just read an article in the new TRUCKIN mag that they just ran 24.2 lbs. of boost on a stock 5.3 making 1308hp. Not saying to do this but our LQ9's aren't too different. I wouldn't feel bad running 12lbs. But again I don't run my stuff hard. Only when necessary. Quote Link to comment Share on other sites More sharing options...
rdavid0412 Posted November 6, 2012 Author Report Share Posted November 6, 2012 Just read an article in the new TRUCKIN mag that they just ran 24.2 lbs. of boost on a stock 5.3 making 1308hp. Not saying to do this but our LQ9's aren't too different. I wouldn't feel bad running 12lbs. But again I don't run my stuff hard. Only when necessary. I thought after more research it was a 4.8? Quote Link to comment Share on other sites More sharing options...
rdavid0412 Posted November 6, 2012 Author Report Share Posted November 6, 2012 After I get my injectors I am really thinking of running 12#s and seeing what happens, I would love to see the power it will make on the Dyno! But still looking into new head gaskets, stud kit, and rod bolts Quote Link to comment Share on other sites More sharing options...
KrausMotorSports Posted November 6, 2012 Report Share Posted November 6, 2012 (edited) I thought after more research it was a 4.8? actually it was the 4.8. sorry your right just saw it! I must have been speed reading. In order for the amount of boost they were throwing towards the so called 160,000 03 silverado stock motor. Keep in mind they re-used all parts, with the exception of Heads cam and Intake. It's just to show the strength of our LS based stock BOTTOM endsChanged the ring Gap to hold more boost ( used old rings) Cleaned original pistons reused the rod and main bearings reused the crank ( no polish nothing However they did hone the cylinder walls http://www.truckinwe...hevy_silverado/ first i had to show off one of our fellow members Chase! I saw this while finding the right link/ Sorry http://www.hotrod.co...ig_bang_theory/ check it out guys! Really interesting stuff! Enjoy! Edited November 11, 2012 by KrausMotorSports (see edit history) Quote Link to comment Share on other sites More sharing options...
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