L92's on a turbo car?
01-04-2009, 12:50 PM
#1
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L92's on a turbo car? I just want see if it would be a good idea or not. I know L92s flow well but will it hold up to 20 psi of boost.
01-04-2009, 01:19 PM
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The deck is not very thick on these from what I understand. They are also still a 4 bolt head... thin deck+4 bolt= pushing water/blowing head gaskets... I think you would be better off with an aftermarket head with a thicker deck and if possible 6 bolt heads/block. I would also have the heads O-ringed for high boost, even if you go 6 bolt, and it would be a requirement for a 4-bolt setup.
I would wait and see what others say though,some people might have has some luck with them. Im just speaking from a theoretical standpoint.
I would wait and see what others say though,some people might have has some luck with them. Im just speaking from a theoretical standpoint.
01-06-2009, 12:03 PM
#5
Check out VEEE8's car.
370ci. GT47-88, TiAL, Turbosmart, WCCH L92's, BigStuff 3, TH400 yada,yada,yada....
829 RWHP @ 14psi and climbing.....
dyno pul: http://videos.streetfire.net/video/8...-Am_205818.htm
370ci. GT47-88, TiAL, Turbosmart, WCCH L92's, BigStuff 3, TH400 yada,yada,yada....
829 RWHP @ 14psi and climbing.....
dyno pul: http://videos.streetfire.net/video/8...-Am_205818.htm
01-06-2009, 12:35 PM
#6
i would stay under 20psi for the reasons that are already stated above. These heads are the **** though for the money and honestly with the right combination you wont "need" 20 psi to do what you probably want to do(even tho i have no clue what you want that much power for but anyways, race car, street car, grocery getter?). If you want a max effort ***** to the wall setup, go with something completely different and push 23psi or something up there. But seriously anything over 700rwhp, especially on the street, is pretty ******* crazy to begin with no matter what setup you have. I would say if you really are dead set on the L92 heads, use them and boost 15psi, you should be good to go with that! 
01-06-2009, 02:55 PM
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Hitting the dyno again this week. Probably taking it up to 18-20 psi, if needed. Just going after "The all important 1000 rwhp dyno sheet" 
I will tell you this, in my car on the street, anything more then 65% throttle with 10+ psi is pretty scary on regular tires. My new 28" drag radials will be here at the end of the week. Then I can do a little safer street driving. To tell you the truth I have only hit WOT for a second or 2 on the street and it was mean! Anything over 650-700 hp is about the limits for practical street driving, More then that and you had better bring your "A game".
I will tell you this, in my car on the street, anything more then 65% throttle with 10+ psi is pretty scary on regular tires. My new 28" drag radials will be here at the end of the week. Then I can do a little safer street driving. To tell you the truth I have only hit WOT for a second or 2 on the street and it was mean! Anything over 650-700 hp is about the limits for practical street driving, More then that and you had better bring your "A game".
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01-07-2009, 01:19 PM
#8
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Hitting the dyno again this week. Probably taking it up to 18-20 psi, if needed. Just going after "The all important 1000 rwhp dyno sheet"
I will tell you this, in my car on the street, anything more then 65% throttle with 10+ psi is pretty scary on regular tires. My new 28" drag radials will be here at the end of the week. Then I can do a little safer street driving. To tell you the truth I have only hit WOT for a second or 2 on the street and it was mean! Anything over 650-700 hp is about the limits for practical street driving, More then that and you had better bring your "A game".
I will tell you this, in my car on the street, anything more then 65% throttle with 10+ psi is pretty scary on regular tires. My new 28" drag radials will be here at the end of the week. Then I can do a little safer street driving. To tell you the truth I have only hit WOT for a second or 2 on the street and it was mean! Anything over 650-700 hp is about the limits for practical street driving, More then that and you had better bring your "A game".
01-27-2009, 08:36 PM
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We made 600 rwkw out of a standard l98 with valve springs, cometic head gaskets, and camshaft on 15 psi with 98 octane pump fuel. Went to 16 psi for ***** and giggles and it ended up in tears! It lifted a head, bent 4 rods and ruined a bore. In saying this it was a little to lean for my liking. The deck on the l92 heads with 9.6:1 comp are too thin for anything above 14psi as they twist. Again this was with timing on the edge of pump fuels limits...
