Highest RWHP w/Stock Engine and Boost?
TECH Addict
Joined: Nov 2001
Posts: 2,659
Likes: 1
From: Bellevue, Wa
I assumed this post meant 100% stock too.
So on this one I would have to go with Stenod in the #1 slot and Rob #2
Either way both insane #'s Great job guys!!! Makes me feel like my motor has a chance of staying together when I throw 10-12lbs of boost at it here in a few weeks.
It's got 67K on the clock and I want 100K+ before being forced to rebuild. Fingers and Toes are crossed
So on this one I would have to go with Stenod in the #1 slot and Rob #2
Either way both insane #'s Great job guys!!! Makes me feel like my motor has a chance of staying together when I throw 10-12lbs of boost at it here in a few weeks.
It's got 67K on the clock and I want 100K+ before being forced to rebuild. Fingers and Toes are crossed
TECH Resident
Joined: Jan 2002
Posts: 956
Likes: 0
From: Phoenix, AZ
Ha ha, I can't afford to run race gas in mine. Can't get it cheaper than 4.79 a gallon around here ( and that was a while ago ).
I agree, technically 918's take ya out of the 100% category . . . the guy who helps me tune my car really doesn't feel safe trying to take my car another pound . . . I'm getting too much valve float, aren't you getting any? How many miles on your engine?
And Rob, I assume you picked up TQ under the curve though, right? Just not peak? I know I've already past peak TQ by the time the valves float, but it dips hard at the top right with the HP on my dyno sheet, I figure I should get more TQ under the curve.
- Dug
I agree, technically 918's take ya out of the 100% category . . . the guy who helps me tune my car really doesn't feel safe trying to take my car another pound . . . I'm getting too much valve float, aren't you getting any? How many miles on your engine?
And Rob, I assume you picked up TQ under the curve though, right? Just not peak? I know I've already past peak TQ by the time the valves float, but it dips hard at the top right with the HP on my dyno sheet, I figure I should get more TQ under the curve.
- Dug
I don't think the 918s should matter.
If he had simply replaced the aging stockers with another stock set that would have been OK, and the 918s don't do anything the stockers don't in his stock cam application, so what's the matter?
If the timing chain breaks and he replaces it with a SLP heavy duty chain should that disqualify from stock engine? I wouldn't think so.
If he had simply replaced the aging stockers with another stock set that would have been OK, and the 918s don't do anything the stockers don't in his stock cam application, so what's the matter?
If the timing chain breaks and he replaces it with a SLP heavy duty chain should that disqualify from stock engine? I wouldn't think so.
Originally Posted by Whistler
I don't think the 918s should matter.
If he had simply replaced the aging stockers with another stock set that would have been OK, and the 918s don't do anything the stockers don't in his stock cam application, so what's the matter?
If the timing chain breaks and he replaces it with a SLP heavy duty chain should that disqualify from stock engine? I wouldn't think so.
If he had simply replaced the aging stockers with another stock set that would have been OK, and the 918s don't do anything the stockers don't in his stock cam application, so what's the matter?
If the timing chain breaks and he replaces it with a SLP heavy duty chain should that disqualify from stock engine? I wouldn't think so.
I got a spare set of 918's Joe can have, wanna see what happens
Originally Posted by y2khawk
As far as the cam goes, sure in an NA application. But the increase spring pressure sure does help when your pushing on the back side of the valve. Simple physics and you have a rough guess of the force you're losing.
I got a spare set of 918's Joe can have, wanna see what happens
I got a spare set of 918's Joe can have, wanna see what happens
Stenod
p.s. I don't need 918's, we should just make a pull at the 13-13.5 we were going to run the day i **** my clutch. That would be interesting
. TECH Addict
Joined: Nov 2001
Posts: 2,659
Likes: 1
From: Bellevue, Wa
Dug, are you gonna upgrade your springs? Seems foolish not too seeing you won't have to change anything else and make massive gains. I would have been placing my order for them the second I read the gains from Rob's post 
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on a 2" valve with 11psi boost you are you looking at a reduced spring pressure of around 35psi? so that would reduce the stock seat pressure from 76 to 41#? and the spring recovers back to 76psi at .1066 valve lift? and the 918's will give you stock seat pressure at boost of 17psi? just doing some homework, but it applies here.. just need to know i'f my math is wrong.
ok by the same math if your exhaust/intake pressure ratio is 1.69 then the boost affects the exhaust spring and the intake spring the same psi... anything higher and the exhaust spring is more important and lower the intake spring is more important.. on a 2.0/1.55 set up is that right?
ok by the same math if your exhaust/intake pressure ratio is 1.69 then the boost affects the exhaust spring and the intake spring the same psi... anything higher and the exhaust spring is more important and lower the intake spring is more important.. on a 2.0/1.55 set up is that right?
y2khawk
As far as the cam goes, sure in an NA application. But the increase spring pressure sure does help when your pushing on the back side of the valve. Simple physics and you have a rough guess of the force you're losing.
As far as the cam goes, sure in an NA application. But the increase spring pressure sure does help when your pushing on the back side of the valve. Simple physics and you have a rough guess of the force you're losing.
Originally Posted by MIGHTYMOUSE
matt you just touched on this... i'd really like some input... is that the right numbers (not counting the stem area)
Should give you a close approximation of the force applied to the valve in the opposite direction of the spring. You're not accounting for the stem area, or the fact the manifold side if the valve is not a flat disc.
What happens during an opening or closing event, i dunno. I'm sure there is some compressible flow experiment waiting to happen with this, but I'm an EE. Not my game
I'd be willing to wager it's having a negative impact on the spring pressure seen by the valve, to what extent it's hard to say.
TECH Apprentice
Joined: Jul 2003
Posts: 329
Likes: 0
From: Virginia Beach
Little bit off topic ,but if I threw 250 shot on my stock motor, would it hold up the way yours are with how much you guys are throwing at it? That is crazy you guys are making in excess of 600hp with a completely stock motor, I didn't think it would handle quite that much. This is giving me hopes of FI a lot sooner than I thought!
Thanks guys.
Thanks guys.