More horse power

Givethecash · March 8th, 2010, 03:04 AM

Ok I've got a 98 cobra that's been rebuilt and has a 299 stroker kit in it. I also have new pistons that make a 11:5:1 compression ratio so If I supercharge it I may need race fuel which I do not want. Would it be better to get better heads and get them ported and polished and throw cams on there or would that be really exspensive? I want around 550 hp and once I get my car tuned the stroker kit should bring it up to around 400 hp from stock.

00mustang00 · March 8th, 2010, 01:14 PM

correct me if im wrong but isnt 11:5:1 compression REALLY high for supercharged motors?

ITS ME DAVID · March 8th, 2010, 02:36 PM

11:5:1 is high for forced induction u will need to run a minimum of 100 octane

Goblin · March 8th, 2010, 04:36 PM

Even 11.5:1 CR is high for a full blown race engine with FI. So if this thing is mainly for street duty, then supercharging is out of the question unless you can drop the static compression ratio.

If your looking for 550hp without changing much... Consider N20. If your combination can pull 400bhp N/A, then you wont need much Nitrous to get 550bhp out of it.

Givethecash · March 8th, 2010, 11:01 PM

Yea I feel like dropping the compression will be too much, and I don't wanna wear down then engine so I think nos is not the way to go. Someone told me a good pair of heads would do the trick

koessl · March 9th, 2010, 01:36 AM

Originally Posted by Givethecash

Yea I feel like dropping the compression will be too much, and I don't wanna wear down then engine so I think nos is not the way to go. Someone told me a good pair of heads would do the trick

but you want to supercharge an 11.5:1 CR engine? okay...

Givethecash · March 9th, 2010, 10:23 AM

Yea I realize that I've got all forged internal, I've already said I'm prob not gonna supercharge so what about head and cams has anyone done that to their 4 valves?

Goblin · March 9th, 2010, 01:00 PM

Nitrous does not "wear down the engine" anymore or less than supercharging or turbocharging.. or even a high output N/A engine.

If you dont want to drop the CR or use FI (or N20 for that matter) then just focus on induction, fuel and timing. Maximizing your valvetrain and headflow, coupled with a matching intake and fuel system would be a good start. However, if your goal is 550bhp, it will NOT happen realistically without Nitrous or Forced Induction.

Givethecash · March 10th, 2010, 03:51 PM

Hmm ok that does make sense, thanks

March 8th, 2010, 03:04 AM	#1
Givethecash Newbie Join Date: Mar 2010 Posts: 8 iTrader: 0 reviews	More horse power Ok I've got a 98 cobra that's been rebuilt and has a 299 stroker kit in it. I also have new pistons that make a 11:5:1 compression ratio so If I supercharge it I may need race fuel which I do not want. Would it be better to get better heads and get them ported and polished and throw cams on there or would that be really exspensive? I want around 550 hp and once I get my car tuned the stroker kit should bring it up to around 400 hp from stock.

March 8th, 2010, 01:14 PM	#2
00mustang00 Hardcore Enthusiast 2011 Caddy cts, 09 Jag XJ Join Date: Apr 2008 Location: New Hope, PA Posts: 2,338 iTrader: 0 reviews	correct me if im wrong but isnt 11:5:1 compression REALLY high for supercharged motors? __________________ 2000 GT- Gone but not forgotten

March 8th, 2010, 02:36 PM	#3
ITS ME DAVID Regular Join Date: Mar 2010 Location: Apple Valley Ca Posts: 164 iTrader: 0 reviews	11:5:1 is high for forced induction u will need to run a minimum of 100 octane __________________ please Visit MyYouTube Profile Below http://www.youtube.com/adjmproduction

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March 8th, 2010, 04:36 PM	#4
Goblin Hardcore Enthusiast 88mm Join Date: Apr 2007 Location: Tucson, AZ Posts: 2,111 iTrader: 0 reviews	Even 11.5:1 CR is high for a full blown race engine with FI. So if this thing is mainly for street duty, then supercharging is out of the question unless you can drop the static compression ratio. If your looking for 550hp without changing much... Consider N20. If your combination can pull 400bhp N/A, then you wont need much Nitrous to get 550bhp out of it.

March 8th, 2010, 11:01 PM	#5
Givethecash Newbie Join Date: Mar 2010 Posts: 8 iTrader: 0 reviews	Yea I feel like dropping the compression will be too much, and I don't wanna wear down then engine so I think nos is not the way to go. Someone told me a good pair of heads would do the trick

March 9th, 2010, 10:23 AM	#7
Givethecash Newbie Join Date: Mar 2010 Posts: 8 iTrader: 0 reviews	Yea I realize that I've got all forged internal, I've already said I'm prob not gonna supercharge so what about head and cams has anyone done that to their 4 valves?

March 9th, 2010, 01:00 PM	#8
Goblin Hardcore Enthusiast 88mm Join Date: Apr 2007 Location: Tucson, AZ Posts: 2,111 iTrader: 0 reviews	Nitrous does not "wear down the engine" anymore or less than supercharging or turbocharging.. or even a high output N/A engine. If you dont want to drop the CR or use FI (or N20 for that matter) then just focus on induction, fuel and timing. Maximizing your valvetrain and headflow, coupled with a matching intake and fuel system would be a good start. However, if your goal is 550bhp, it will NOT happen realistically without Nitrous or Forced Induction.

March 10th, 2010, 03:51 PM	#9
Givethecash Newbie Join Date: Mar 2010 Posts: 8 iTrader: 0 reviews	Hmm ok that does make sense, thanks

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