Big N/A horse power guys please step in
10-24-2009, 09:27 AM
#25
It's one thing to cruse around town. It's another to drive it like a stupid *** putting big loads on the engine at race fuel timing.
Years ago the said limit for pump gas was 11.0 to 1. I ran 12.0 to 1 in my last motor making 550rw on pump gas. Now I see many builds going 12.5 to 1 with no issues. What is the limit? A street tune should have a conservative timing curve and knock sensors adjusted to pull timing accordingly.
What happened to the FMS motor?
Years ago the said limit for pump gas was 11.0 to 1. I ran 12.0 to 1 in my last motor making 550rw on pump gas. Now I see many builds going 12.5 to 1 with no issues. What is the limit? A street tune should have a conservative timing curve and knock sensors adjusted to pull timing accordingly.
What happened to the FMS motor?
I happen to be pretty good friends with one of the top ls builders in the land and it is amazing the amount of the 12:1 pump gas motors that he fixes. Same problem with everyone of them. Car is built in nice cool weather, weather turns hot and boom, bad motor. He has built over 600 rwhp motors with under 11.5:1 compression.
I am going to bow out now, as I really don't know what you want out of the car and what you consider streetable. Something I would not tolerate at all, you may be perfectly fine with. Good luck.
Last edited by Stang's Bane; 10-24-2009 at 10:04 AM.
10-24-2009, 09:39 AM
#26
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Thats the big problem with n/a motors, you can get some big power out of them, but they lose their street friendliness in the process. I'd get the biggest cubes you can get if you wanna make 600-700 and still be street "friendly".
honestly, id get a 408 and throw a lil turbo on if i wanted streetable 700hp
honestly, id get a 408 and throw a lil turbo on if i wanted streetable 700hp
10-24-2009, 10:00 AM
#27
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You guys did a great job with Robs car!
Goal for my car is to be the fastest C5 6 speed. That's no secret!
10-24-2009, 10:16 AM
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Thats the big problem with n/a motors, you can get some big power out of them, but they lose their street friendliness in the process. I'd get the biggest cubes you can get if you wanna make 600-700 and still be street "friendly".
honestly, id get a 408 and throw a lil turbo on if i wanted streetable 700hp
honestly, id get a 408 and throw a lil turbo on if i wanted streetable 700hp
You don't know much if you say put a turbo on it. IT'S A 6 SPEED. It's way to hard to make a 6 speed work with boost.
This is a build I just finished up. TTix Twin turbo 418. Not the way I want to go. It's an awesome street car but will be hard to make it a 9.50 car.
http://forums.corvetteforum.com/c5-f...tix-build.html
10-24-2009, 12:49 PM
#29
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This Thread is about NA Engines we are getting way off course.Making 700RWHP with a Turbo is Childs Play.I Just saw a run on the DYNO with 377CI Make 1793 RWHP and it was an easy build.Lets Get back to NA
10-24-2009, 01:07 PM
#30
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The problem with trying to street drive a 700rwhp Big cube solid roller motor is the valvetrain. In order to make 700rwhp you will need a big *** cam, which requires big *** springs and a crazy rocker setup. Correct if I am wrong but most of those high dollar parts are made to run for short periods of time, at certain measurements as far as pre load on the lifters and spring pressures. 600rwhp would be an attainable goal while still keeping streetability, 700rwhp would be pretty hard to do in a car that is still used to "cruise" the streets.
10-24-2009, 01:18 PM
#31
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my ls7 make's 619rwhp@6800rpm590ftlbs with fast 102mm intake nw102mmtb allproheads and secret cam and all the supporting mods right now its walkin the fine line street car race car cold starts are a bitch and a little surging from 2200-2600rpm so a 700rwhp n/a street car is a pipe dream all depends on what you call a street car.i can get my zo6 and go anywher with cold/ac thats a street car..not something that runs on 100plus octane and go to the hang out then come home.. just my opinion..
Last edited by spooky_zo6; 10-24-2009 at 01:42 PM.
10-24-2009, 01:32 PM
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my ls7 make's 619rwhp@6800rpm590ftlbs with fast 102mm intake nw102mmtb allproheads and secret cam and all the supporting mods right now its walkin the fine line street car race car cold starts are a bitch and a little surging from 2200-2600rpm so a 700rwhp n/a street car is a pipe dream all depends on what you call a street car.i can get my zo6 and go anywher with cold/ac thats a street car..not something that runs on 100plus octane and go to the hang out then come.. just my opinion..
10-24-2009, 01:35 PM
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I think you should contact ERL about their 500" deck-plated and sleeved LS2. With a 24x/25x @.050 (around.600" lift) hydraulic roller cam, LS7 heads and intake we saw 730hp @ 6300rpm. on a 250 shot the horsepower was just over 900. Nothing exotic here.
93 octane pump gas
10.3:1 CR
93 octane pump gas
10.3:1 CR
Last edited by Kaptain Kirk; 10-24-2009 at 01:46 PM. Reason: added compression ratio
10-24-2009, 01:40 PM
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tryed to post it but keeps failing upload... my car could make a little more hp maybe like 10-20 more but my tuner keeped the timeing low due to the hottttttt climate out here other mods are 1/78 headers borla stinger no cats eletric water pump vararam sc-1 may add a vacum pump to add some hp. i heard ther worth 7-10 at wheels..i will tell you the cam is small dont like that rockin side to side stuff...
10-24-2009, 01:42 PM
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I think you should contact ERL about their 500" deck-plated and sleeved LS2. With a 24x/25x @.050 (around.600" lift) hydraulic roller cam, LS7 heads and intake we saw 730hp @ 6300rpm. on a 250 shot the horsepower was just over 900. Nothing exotic here.
93 octane pump gas
93 octane pump gas
Thanks
All Big N/A power welcome.
10-24-2009, 01:47 PM
#37
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I think you should contact ERL about their 500" deck-plated and sleeved LS2. With a 24x/25x @.050 (around.600" lift) hydraulic roller cam, LS7 heads and intake we saw 730hp @ 6300rpm. on a 250 shot the horsepower was just over 900. Nothing exotic here.
93 octane pump gas
10.3:1 CR
93 octane pump gas
10.3:1 CR
flywheel or rwhp
10-24-2009, 01:55 PM
#39
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i dought it is rwhp... take that 730hp subtract 18percent driveline loss and you got what i got. with 427cubicinches no 500cubic inches besides that motor is like 20k.i did all my mods for $9500 installed
10-24-2009, 01:57 PM
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tryed to post it but keeps failing upload... my car could make a little more hp maybe like 10-20 more but my tuner keeped the timeing low due to the hottttttt climate out here other mods are 1/78 headers borla stinger no cats eletric water pump vararam sc-1 may add a vacum pump to add some hp. i heard ther worth 7-10 at wheels..i will tell you the cam is small dont like that rockin side to side stuff...