408 turbo cam
07-28-2010, 01:48 PM
#2
Not a good selection for a turbo build - at all. Way too much overlap and duration.
You need to give a complete run down of your engine, power goals, type of fuel, driving style, vehicle weight, gearing... even then it's like pulling teeth to find someone who will freely give advice on a turbo cam profile. I caved in and bought a turbo cam grind from Virginia Speed.
You need to give a complete run down of your engine, power goals, type of fuel, driving style, vehicle weight, gearing... even then it's like pulling teeth to find someone who will freely give advice on a turbo cam profile. I caved in and bought a turbo cam grind from Virginia Speed.
07-28-2010, 10:08 PM
#3
There are so many ideas. reverse split, no split, normal split. I would keep lift .600 or under personally much easier on valve springs. And lsa most times for turbo you see 116 and up.
I am pretty happy with my gt7 cam,its pretty mellow no noticeable lope. I have upped lift with the 1.8 rockers. So its around 212/230 /590/590/121 . Seems to work fine. No dyno numbers yet. I personally like pretty mild cam let the boost do the work and keep my car real nice when driving around town.
I have had enough lopey cams in my old muscle cars. Don't need lopey anymore and hate low speed surging, and would hate changing valvesprings yearly in these stupid f bodies with half the engine under the cowl!
I am pretty happy with my gt7 cam,its pretty mellow no noticeable lope. I have upped lift with the 1.8 rockers. So its around 212/230 /590/590/121 . Seems to work fine. No dyno numbers yet. I personally like pretty mild cam let the boost do the work and keep my car real nice when driving around town.
I have had enough lopey cams in my old muscle cars. Don't need lopey anymore and hate low speed surging, and would hate changing valvesprings yearly in these stupid f bodies with half the engine under the cowl!
07-29-2010, 02:35 AM
#5
Overlap is over analyzed in turbo cam selection.
Reason why people think overlap 'bleeds' boost, the engines moving more air, boost decreases, horsepower is increasing though. Boost is a measurement of restriction, not air flow.
With that said, the camshaft OP has would be good for in general a larger turbocharger then "88mm" , I'm comparing that to numbers from a PT88 or 4718 head unit. I'd consider a camshaft that spec for GT55 drag race, 400ci+ 3400lbs TH400 etc.
What you could do, send that cam to Cammotion, or Bullet etc. Have them regrind the lobes, i'd take 4º out of intake and exhaust and see if they can take .015" off the lobe lift, it will rpm better .600" lift IMO.
242/242 .600/.600 112 , that would work better, i'd rather be in mid 230 duration area.
For $125 i'd say its worth it.
