L76 for performance?
06-26-2009, 12:41 PM
#1
L76 for performance? I've been casually keeping my eye out for a dropout for my current project.
I have a '94 rx7 and am doing an LSx swap. The plan from the beginning has been an LS2 and T56. I already have purchased an LS3 intake and L92 heads for it. I plan on doing research and some thinking after I have the engine and deciding which cam I want. It will be a small cam just to wake it up a little bit. It doesn't need a huge cam seeing as these parts should put it in the 475hp range...and that makes for a very fast car. (and already more power than the diff can handle...after it breaks itself it can get boost and an 8.8
)
Now I've seen an L76 come up. Its the first dropout I've seen, and its really low mileage.
I believe the intake and the heads are pretty much identical to what I've already got? A tune and a nice cam should put me at about the same power level as an LS2 with the same parts correct? I have a lot of experience with HPtuners so I'm not worried about tuning it.
The DoD and cam phasing are very interesting to me. They seem like appealing things to have for a performance street car. The cam phasing with a proper tune could really provide some massive low end gains...and down the road if I wanted to go crazy with a camshaft I could just disable the cam phasing and there would be plenty of room for the valves.
I figure the DoD would have slight parasitic losses (just guessing) and the engine will be lower compression than an LS2. Are those the only differences?
Is there any reason *not* to go with an L76?
If I were to get the L76, raise the compression, and put a small cam in it, can I expect the same results as I would get with an LS2?
Thank you for the help! I searched a bit and couldn't find anything.
I have a '94 rx7 and am doing an LSx swap. The plan from the beginning has been an LS2 and T56. I already have purchased an LS3 intake and L92 heads for it. I plan on doing research and some thinking after I have the engine and deciding which cam I want. It will be a small cam just to wake it up a little bit. It doesn't need a huge cam seeing as these parts should put it in the 475hp range...and that makes for a very fast car. (and already more power than the diff can handle...after it breaks itself it can get boost and an 8.8
)Now I've seen an L76 come up. Its the first dropout I've seen, and its really low mileage.
I believe the intake and the heads are pretty much identical to what I've already got? A tune and a nice cam should put me at about the same power level as an LS2 with the same parts correct? I have a lot of experience with HPtuners so I'm not worried about tuning it.
The DoD and cam phasing are very interesting to me. They seem like appealing things to have for a performance street car. The cam phasing with a proper tune could really provide some massive low end gains...and down the road if I wanted to go crazy with a camshaft I could just disable the cam phasing and there would be plenty of room for the valves.
I figure the DoD would have slight parasitic losses (just guessing) and the engine will be lower compression than an LS2. Are those the only differences?
Is there any reason *not* to go with an L76?
If I were to get the L76, raise the compression, and put a small cam in it, can I expect the same results as I would get with an LS2?
Thank you for the help! I searched a bit and couldn't find anything.
06-26-2009, 01:31 PM
#4
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rectangular ports the l76 has the rectangular ls3/l92 heads and intake. if you go a little smaller on the intake duration to keep velocity up through the big ports at low rpm, you keep good torque but still get the good flow at the top end, right? so it seems like it would be better to keep that heads intake setup over traditional ls1 heads.
07-03-2009, 10:20 PM
#5
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the l76 has the rectangular ls3/l92 heads and intake. if you go a little smaller on the intake duration to keep velocity up through the big ports at low rpm, you keep good torque but still get the good flow at the top end, right? so it seems like it would be better to keep that heads intake setup over traditional ls1 heads.
Yea, thats my plan... CR 10.1 / DCR 8.25 / Comp XER 220/228 on a 112+4 / L92's shaved 0.035" / 0.051 Cometic with stock 2005 LQ4 block topped off with L76 and FAST 90TB. Hope to make 425RWHP and huge torque down low...
