Heads for FI
Thread Starter
Joined: Nov 2001
Posts: 3,066
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From: Sunny San Diego
Heads for FI I am seeing 450 rwhp with 5# and my Stage II 5.3L heads. Probably a bit more once the fuel is taken care of. My goal as you well know is 500 rwhp.
Can I reach that goal with Stage I 5.7L heads and a bit more boost?
Can I reach that goal with Stage I 5.7L heads and a bit more boost?
TECH Resident
Joined: Jan 2002
Posts: 956
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From: Phoenix, AZ
Hmmm . . . I would think that 500 might be tough on 91 octane . . . especially with that CR. I'm no expert however. I hit 621 on 91 octane, but I had a stock ( 10.1 ) CR, and was running alky injection, no water mix. I guess the only way to find out is get it back on the dyno, and bump it up slowly, that's what I'd do.
- Dug
- Dug
Thread Starter
Joined: Nov 2001
Posts: 3,066
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From: Sunny San Diego
I don't plan on going any higher with the current set-up.
That is why the head change to lower CR. Just trying to figure out what to get. This is my DD, so didn't want to go too low on the CR.
That is why the head change to lower CR. Just trying to figure out what to get. This is my DD, so didn't want to go too low on the CR.
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Each full point of compression is 3% more power for n/a.
I would go 9:1 or however low you can go.
I am running stage 1 6.0 heads, decked to 69cc's to clearn them up.
I would go 9:1 or however low you can go.
I am running stage 1 6.0 heads, decked to 69cc's to clearn them up.
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Verdad Gallardo Thread Starter
Joined: Nov 2001
Posts: 3,066
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From: Sunny San Diego
Even with my car being a DD? I don't want to lose my part-throttle power. I am not looking for the most power. Which of course low CR and high boost would give.
I still have N20 if I need more.
Sorry for all the questions, but I don't want to switch out heads again.
I still have N20 if I need more.
Sorry for all the questions, but I don't want to switch out heads again.
Thread Starter
Joined: Nov 2001
Posts: 3,066
Likes: 0
From: Sunny San Diego
Thanks, but I am pretty much done with the car (HP wise). Anymore and I think I will start breaking things. I don't want to be tweaking this thing everyday. Just a reliable 500 rwhp .