Buying car w/ 517hp LS2/L92 :D
#1
Buying car w/ 517hp LS2/L92 :D
Haven't been on the 'maro boards in a while, but I'm back!
With a question about whether the dyno results for the '94 RX-7 I'm buying (picking it up next week) seem a bit HIGH or if they're realistic:
Actually, now that I look at it I see that the plots are labeled as *engine* power and torque, that might explain it if they adjusted the rear wheel numbers...
The engine is an LS2 out of a Trailblazer SS, with L92 heads lightly shaved to achieve ~11.3:1 CR. LS3 intake. Cam is a street-oriented spec by Patrick G.
Anyway, thoughts and impressions on this build are welcomed!
I've been daily-driving a 2.0 liter S2000 for the past 4 1/2 years, it's gonna be good to get back into the V8 world
With a question about whether the dyno results for the '94 RX-7 I'm buying (picking it up next week) seem a bit HIGH or if they're realistic:
Actually, now that I look at it I see that the plots are labeled as *engine* power and torque, that might explain it if they adjusted the rear wheel numbers...
The engine is an LS2 out of a Trailblazer SS, with L92 heads lightly shaved to achieve ~11.3:1 CR. LS3 intake. Cam is a street-oriented spec by Patrick G.
Anyway, thoughts and impressions on this build are welcomed!
I've been daily-driving a 2.0 liter S2000 for the past 4 1/2 years, it's gonna be good to get back into the V8 world
Last edited by Dan Baldwin; 09-22-2011 at 05:50 PM.
#3
Re: Buying car w/ 517hp LS2/L92 :D
When it's a motor swap, you have to consider the possibility that the numbers came from an engine dyno, running no accessories and open headers. I've seen a stock LS1 with just headers pull well over 400hp in that configuration, so a heads/cam LS2 breaking 500 doesn't surprise me at all.
A '94 RX7 with an LS swap...
Post videos once you get it!
A '94 RX7 with an LS swap...
Post videos once you get it!
#4
Re: Buying car w/ 517hp LS2/L92 :D
#5
Re: Buying car w/ 517hp LS2/L92 :D
When it's a motor swap, you have to consider the possibility that the numbers came from an engine dyno, running no accessories and open headers. I've seen a stock LS1 with just headers pull well over 400hp in that configuration, so a heads/cam LS2 breaking 500 doesn't surprise me at all.
Just seem like BIG numbers to be at the wheels. Similar intake/exhaust/cam mods to a 1.0 liter larger-displacement LS7. Found this on CorvetteForum.com:
"First is stock, second with bolt-ons: K&N, tune, 160 stat, Vette-Air charger, ported TB & ported intake, and American Racing headers, third is bolt-ons and QM-600 cam"
Logically, mine should look like something between the red and green curves, but scaled down by 6.0/7.0, which'd give ~405 "torques" (damn you, Jeremy Clarkson!) and ~445 horsepower(s).
Owner (good friend, straight-shooting dude, very reliable source) indicates that the 474 lb-ft/517hp are indeed rear wheel numbers, though.
Dyno results thread here: http://www.norotors.com/index.php?topic=4134.0
A '94 RX7 with an LS swap...
Post videos once you get it!
Post videos once you get it!
#7
Re: Buying car w/ 517hp LS2/L92 :D
Those numbers on a Mustang dyno are even more suspicious -- those usually rate substantially lower (10-20%) than Dynojets, which are responsible for most of the numbers we're familiar with around here.
Reading through that thread, I found that it's running 11.4:1 compression. I think that's your answer; a stock LS7 runs 11.0:1. LS2 is 10.9, LS3 is 10.7, LS6 is 10.5, and LS1 is 10.25:1. That's a pretty big bump in compression, and paired with the right cam and a great tune, I'll bet that's where the power is coming from.
Reading through that thread, I found that it's running 11.4:1 compression. I think that's your answer; a stock LS7 runs 11.0:1. LS2 is 10.9, LS3 is 10.7, LS6 is 10.5, and LS1 is 10.25:1. That's a pretty big bump in compression, and paired with the right cam and a great tune, I'll bet that's where the power is coming from.
#8
Re: Buying car w/ 517hp LS2/L92 :D
Wow, and this is what I told my wife!
I'm picking up a '93 FD RX-7 tomorrow and even though it's on the same stock motor (rebuilt 30k miles ago) I'm going to set funds aside for an LS1 for a swap.
I'm picking up a '93 FD RX-7 tomorrow and even though it's on the same stock motor (rebuilt 30k miles ago) I'm going to set funds aside for an LS1 for a swap.
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