How much more on meth?
How much more on meth? I have a 427 LSX,LS7 heads,Forged ,studded,620 cam,ported tb,85 lb injectors,YSI on only 11 lbs.My tuner got 731 at only 6300 rpm without spray then had a problem with the dyno computer so I took it home.My question is what do you guys think the numbers would be with the meth? I live 5 hrs away so I wont be back to that shop till spring
TECH Enthusiast
Joined: Jul 2008
Posts: 577
Likes: 1
From: League City, Tx
You can make an easy 900-950rwhp if you pulley the blower down and put bunch of meth in it.. Assuming its M6.
11 psi ain't ****. Pulley it for max impeller speed at whatever rpm you decide to limit it at. On a good flowing 427, you should see 20-21 psi or more with the YSI and a 2.75" pulley with an 8" balancer @6800.
Better make sure the fuel/meth systems are 100% right, along with a tuner that knows what he is doing.
11 psi ain't ****. Pulley it for max impeller speed at whatever rpm you decide to limit it at. On a good flowing 427, you should see 20-21 psi or more with the YSI and a 2.75" pulley with an 8" balancer @6800.
Better make sure the fuel/meth systems are 100% right, along with a tuner that knows what he is doing.
,Running a progessive snow system with there biggest nozzles.Supposed to be good for 1000 hp.I have a smaller pulley but was leary of lifting the LS7 heads.The tuner has a lot of experiance.We were playing it safe but wanting to turn it up now.With the set up now how much would the meth add?
Depends on how much timing is being lost to higher IAT's and how far you are willing to push the timing when the meth is spraying. 15-20rwhp per degree of timing seems to be the rule of thumb. I'm on E85, so I have a little more wiggle room, but I set my tune up to only add "extra" timing for the meth when IAT's get less than 50F. So if my meth pump quits or flow isn't what it should be my IAT's won't be low enough to give me that "extra" timing. Then I still pull timing when IAT's get over 122F and I'm pretty aggressive with how much and how fast it pulls the timing. The car is tuned so that I can do a pull off meth and not go too lean.
Depends on how much timing is being lost to higher IAT's and how far you are willing to push the timing when the meth is spraying. 15-20rwhp per degree of timing seems to be the rule of thumb. I'm on E85, so I have a little more wiggle room, but I set my tune up to only add "extra" timing for the meth when IAT's get less than 50F. So if my meth pump quits or flow isn't what it should be my IAT's won't be low enough to give me that "extra" timing. Then I still pull timing when IAT's get over 122F and I'm pretty aggressive with how much and how fast it pulls the timing. The car is tuned so that I can do a pull off meth and not go too lean.
