A little disappointed...LS1+228R+PRC Stg 2.5 5.3s+FAST92 = 421/391
#21
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those are great numbers. run some race fuel, advance the timing. work on the exhaust, that can help some. but really man those numbers are awesome. you may be able to hit a high 6 if you want too. and the driveability of it (based on the tune) is alot better than more agressive setups that make more power but not throughout the entire power band like you do.
#22
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Bringing this back up. I was thinking up doing some upgrading.
For the same price, I can either do the PRC 227 heads and keep my existing 228R cam, or I can do the PRC 225s and go with something like a Torquer 2. I'm guessing that I could make more peak hp by going with the 225s and larger cam but driveability and average power would probably be better with the 'small' 228 cam and 227 heads?
Also, and I sort of forgot this aspect of it, the initial pre-FAST dyno numbers were with E85 fuel (the car was tuned for it before I purchased it). The current numbers are on 92 pump gas. When it got retuned after the FAST intake install, we switched to pump gas as I felt the E85 was a bit pointless. At this power/compression, is there really a hp gain going to E85? I've ran it with great success in my previously owned turbo cars but with less than 11:1 compression N/A is it really worth it?
For the same price, I can either do the PRC 227 heads and keep my existing 228R cam, or I can do the PRC 225s and go with something like a Torquer 2. I'm guessing that I could make more peak hp by going with the 225s and larger cam but driveability and average power would probably be better with the 'small' 228 cam and 227 heads?
Also, and I sort of forgot this aspect of it, the initial pre-FAST dyno numbers were with E85 fuel (the car was tuned for it before I purchased it). The current numbers are on 92 pump gas. When it got retuned after the FAST intake install, we switched to pump gas as I felt the E85 was a bit pointless. At this power/compression, is there really a hp gain going to E85? I've ran it with great success in my previously owned turbo cars but with less than 11:1 compression N/A is it really worth it?
#23
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There's no reason to change heads with a cam that small, you won't gain any power. Doesnt matter what kind of numbers the heads put up at over .6 lift, when you arent lifting the valves that high to ever see that sort of flow. Food for thought.
Also, my motor is 14.7:1. If you're going to run E85, you might as well build all the compression you can into your engine to get the maximum benefit of the fuel.
Also, my motor is 14.7:1. If you're going to run E85, you might as well build all the compression you can into your engine to get the maximum benefit of the fuel.
#28
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Better heads always make more power no matter the cam. Hell put ported heads on a stock cammed car and you'll pick up a good chunk of power. The more cam you have, the more the heads can shine, but don't just look at where the cam lift is. Heads make power in the .200-.600" range; that's why heads with high mid-range lift make power, especially if they have port velocity to go with it.
However, in the OP's case, swapping heads will be an expensive change that won't be worth 20HP. A cam change could make 15HP for a lot less. However, you're going to give up some streetability to get there.
However, in the OP's case, swapping heads will be an expensive change that won't be worth 20HP. A cam change could make 15HP for a lot less. However, you're going to give up some streetability to get there.
#29
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head design has definately made some advances in 5 years, you could benefit from something like a aftermarket casting head & new camshaft. That being said you have to decide if you want to spend extra $$$ for the extra power. A set of PRC as cast aftermarket castings & something like a Torquer v3 or Tsunami would be worth considering. If you can get 20hp from heads & 20hp from a camshaft change... It's really up to you on your overall goals & $$ your wanting to spend.
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Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com
Jason
Co-Owner, Texas Speed & Performance, Ltd.
2005 Twin Turbo C6
404cid Stroker, 67mm Twins
994rwhp/902lb ft @ 22 psi (mustang dyno) www.Texas-Speed.com
#30
TECH Enthusiast
I think your numbers a pretty close to what they should be. You can check my signature to see what I have done, and my setup put down 428/400. For the amount of power your down, it could be contributed to many things, I wouldn't be worried about it if I was you. Be more worried about the things that matter, your et and mph at the track and how it feels on the street. That's a lot more important than some number a machine spits out. After all, it is just a tuning and comparison tool.
#32
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If it's (for example) only a 5hp change to go to E85 over 92 pump gas in my current N/A car, I don't think it's worth it to me to be relegated to finding a gas station that sells it, even though many do in my area. I know I would never be able to feel the difference anyway. If it would pick up 10-20 (not likely) than sure, I'll run it.
#34
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So it sounds like it's not worth changing any of the major parts unless I completely revamp the whole setup and go big (e.g. PRC 227 heads and a larger cam like a Tv3). Even then, I might pick up only 30-40rwhp max for maybe $3000.
Sounds like I need to spray it! :evilgrin:
Never had a nitrous car before, maybe this is the one.....
Sounds like I need to spray it! :evilgrin:
Never had a nitrous car before, maybe this is the one.....
#36
Super Hulk Smash
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So it sounds like it's not worth changing any of the major parts unless I completely revamp the whole setup and go big (e.g. PRC 227 heads and a larger cam like a Tv3). Even then, I might pick up only 30-40rwhp max for maybe $3000.
Sounds like I need to spray it! :evilgrin:
Never had a nitrous car before, maybe this is the one.....
Sounds like I need to spray it! :evilgrin:
Never had a nitrous car before, maybe this is the one.....
#38
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Thanks. I do understand the general benefits of E85. I ran it most recently in the car I sold to get my current one, a 1999 Mustang GT with a built engine (still 4.6L) and 2v heads. It made just under 700whp at 24lbs of boost from a 76mm turbo. That car ran on E85 and it loved it.
If it's (for example) only a 5hp change to go to E85 over 92 pump gas in my current N/A car, I don't think it's worth it to me to be relegated to finding a gas station that sells it, even though many do in my area. I know I would never be able to feel the difference anyway. If it would pick up 10-20 (not likely) than sure, I'll run it.
If it's (for example) only a 5hp change to go to E85 over 92 pump gas in my current N/A car, I don't think it's worth it to me to be relegated to finding a gas station that sells it, even though many do in my area. I know I would never be able to feel the difference anyway. If it would pick up 10-20 (not likely) than sure, I'll run it.
#39
I have the exact same setup as you just patriot stage 2 5.3s with the same cam and ls6 intake I'm running 7.1 7.0 @95-96 mph 1/8 that's pretty fast and nitrous all the way just hit my set up with a 125 shot and ran 6.70 @103.2 bottle is awesome and this set up loves it hope that helps
#40
I think 15rwhp is about average gain for the FAST 92 over the LS6 even with heads/cam. Those heads aren't the greatest ever, but they are decent. 430rwhp sounds about right for that setup. To hit closer to 460, you'd need better heads, milled to hell, thinner gaskets, and all kinds of little tricks (EWP, roller rockers, etc). It adds up to a ton of cash for a few ponies.
I'm guessing the FAST had a better curve throughout (19 peak but perhaps more in the midrange?). Either way, it probably isn't super noticeable...
I'm guessing the FAST had a better curve throughout (19 peak but perhaps more in the midrange?). Either way, it probably isn't super noticeable...