Project: 97 6-speed, SC400 supercharged 4.7L V8
11-19-08, 06:36 AM
#32
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Not sure how I missed this Scott! Looks like you opened a can of worms! I call dibs on first ride along!
Just a thought... although I know you've probably already explored this route but couldn't you use an adjustable cam gear on the exhaust cam? Then you could dial back the overlap or the larger cams U had? I know it's a trick my "honduh" buddys have been doing for a while now. You could go one step further and use an adjustable gear on the intake cam and advance it. This would put your intake and exhaust durations closer together. (Gotta be honest I don’t even know what your motor looks like I’m just assuming it has cam gears on a timing belt and not a chain.)
Seems like for the 500-600 HP goals this shouldn’t be that hard with some decent boost and the C.I.’s your pushing?
I've successfully helped build 2 turbo 5.0 cars with a completely stock long block and the cars easily made 450-500 HP range at moderate boost. And could have made more if the block would have taken it. Hell my 3.8 6cyl buick motor with stock heads and cam made 475 @ the wheels. Now with a tiny 204/214 cam and ported iron heads with slightly larger valves I'm pushing over 500whp. (guessing by the 131 trap speeds) This is all done on 91 pump gas with alcohol injection. (a must if you ask me) With a massive 5500 redline. Which is very easy on valve train parts.
Don't get me wrong all the cam research it's fascinating. But stock cams and valves with some bowl and port should easily put you into the mid 550 range with boost? Thats the main reason I like boost! You don't need to go into all the crazy flow dynamics. You just crank up the boost and make your own flow rates! Also with that big ol 8cyl why bother reving it to the moon? Keep rpms down and boost up! Your engine will last longer you’ll make buttloads of torque! That’s what really gets you moving….
Oh and If the IGN is similar to the sc300 I wouldn't worrie about IGN. Just gap your plugs down. Everyone told me I'd have to ugrade to the distrib less tt supra IGN for my car. pfffft!
OEM:
coil
wires
cap
rotor
cheap copper core acdelcos gapped at 24
I've run as much as 26psi through them with no IGN breakup. I threw an MSD on that I had laying around the house. Didn't notice a difference. Just idled cleaner. Don't be tempted by those iridium plugs either. I installed those and I got a little break up around 22+ ppsi. Just copper AC R42TS I believe was the PN for me.
Good luck keep us posted.
Awesome project!
Just a thought... although I know you've probably already explored this route but couldn't you use an adjustable cam gear on the exhaust cam? Then you could dial back the overlap or the larger cams U had? I know it's a trick my "honduh" buddys have been doing for a while now. You could go one step further and use an adjustable gear on the intake cam and advance it. This would put your intake and exhaust durations closer together. (Gotta be honest I don’t even know what your motor looks like I’m just assuming it has cam gears on a timing belt and not a chain.)
Seems like for the 500-600 HP goals this shouldn’t be that hard with some decent boost and the C.I.’s your pushing?
I've successfully helped build 2 turbo 5.0 cars with a completely stock long block and the cars easily made 450-500 HP range at moderate boost. And could have made more if the block would have taken it. Hell my 3.8 6cyl buick motor with stock heads and cam made 475 @ the wheels. Now with a tiny 204/214 cam and ported iron heads with slightly larger valves I'm pushing over 500whp. (guessing by the 131 trap speeds) This is all done on 91 pump gas with alcohol injection. (a must if you ask me) With a massive 5500 redline. Which is very easy on valve train parts.
Don't get me wrong all the cam research it's fascinating. But stock cams and valves with some bowl and port should easily put you into the mid 550 range with boost? Thats the main reason I like boost! You don't need to go into all the crazy flow dynamics. You just crank up the boost and make your own flow rates! Also with that big ol 8cyl why bother reving it to the moon? Keep rpms down and boost up! Your engine will last longer you’ll make buttloads of torque! That’s what really gets you moving….
Oh and If the IGN is similar to the sc300 I wouldn't worrie about IGN. Just gap your plugs down. Everyone told me I'd have to ugrade to the distrib less tt supra IGN for my car. pfffft!
OEM:
coil
wires
cap
rotor
cheap copper core acdelcos gapped at 24
I've run as much as 26psi through them with no IGN breakup. I threw an MSD on that I had laying around the house. Didn't notice a difference. Just idled cleaner. Don't be tempted by those iridium plugs either. I installed those and I got a little break up around 22+ ppsi. Just copper AC R42TS I believe was the PN for me.
Good luck keep us posted.
Awesome project!
Last edited by forcefed86; 11-19-08 at 06:52 AM.
11-19-08, 07:39 AM
#33
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Not sure how I missed this Scott! Looks like you opened a can of worms! I call dibs on first ride along!
Just a thought... although I know you've probably already explored this route but couldn't you use an adjustable cam gear on the exhaust cam? Then you could dial back the overlap or the larger cams U had? I know it's a trick my "honduh" buddys have been doing for a while now. You could go one step further and use an adjustable gear on the intake cam and advance it. This would put your intake and exhaust durations closer together. (Gotta be honest I don’t even know what your motor looks like I’m just assuming it has cam gears on a timing belt and not a chain.)
Just a thought... although I know you've probably already explored this route but couldn't you use an adjustable cam gear on the exhaust cam? Then you could dial back the overlap or the larger cams U had? I know it's a trick my "honduh" buddys have been doing for a while now. You could go one step further and use an adjustable gear on the intake cam and advance it. This would put your intake and exhaust durations closer together. (Gotta be honest I don’t even know what your motor looks like I’m just assuming it has cam gears on a timing belt and not a chain.)
I know what you are saying about stock cams and boost, I guess I might have went a little overboard.
Oh and If the IGN is similar to the sc300 I wouldn't worrie about IGN. Just gap your plugs down. Everyone told me I'd have to ugrade to the distrib less tt supra IGN for my car. pfffft!
I've run as much as 26psi through them with no IGN breakup. I threw an MSD on that I had laying around the house. Didn't notice a difference. Just idled cleaner. Don't be tempted by those iridium plugs either. I installed those and I got a little break up around 22+ ppsi. Just copper AC R42TS I believe was the PN for me.
I've run as much as 26psi through them with no IGN breakup. I threw an MSD on that I had laying around the house. Didn't notice a difference. Just idled cleaner. Don't be tempted by those iridium plugs either. I installed those and I got a little break up around 22+ ppsi. Just copper AC R42TS I believe was the PN for me.
11-19-08, 07:52 AM
#34
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Sorry, I never worried much about the CEL's cause I always new I was going to a stand alone. I never put enough focus on it to solve it. Maybe Mark (Blizzy) will work to a solution on his.
11-19-08, 11:21 AM
#36
Yep, I have looked at this, the problem is the cams are married by gears in the center of the camshafts, I will post a picture later. I did explore making a adjustable gear but there is a real space issue to do it. Kelford is actually developing cams with adjustable gears currently but nothing on it yet. I do have adjustable gears on the intake cams to change the valve timing but it wont effect the overlap. Thats why I had them grind the overlap to a specific amount. I love the idea of adjustable gears, just getting there seemed like a tough route.
I know what you are saying about stock cams and boost, I guess I might have went a little overboard.
Good point, You may be right that my stck Dizzy's are fine, I guess I really like the COP's clean look as well.
I know what you are saying about stock cams and boost, I guess I might have went a little overboard.
Good point, You may be right that my stck Dizzy's are fine, I guess I really like the COP's clean look as well.
I would stick with the Head work and cams you're doing. That's so overlooked in F/I, and F/I loves to flow thru heads and valves. Remember a engine is just a air pump. I might add to unless I missed it, back cutting valves, bringing the seats out, deshourding, and reshaping the Combustion Chamber along with CC ing, the heads. and Flow bench testing with someone that is very good with headwork. Also lightening the Valvetrain is a good idea, with things like Titanium valvetrain parts.
I would also get those 2 1/4 S&S headers off there. Their gonna be a stop gap, that motor is gonna flow some spend exhaust gases.
Sounds like your looking to make power up in the 6500rpm + powerband. On a 4 cam, 32 Valve engine, built with High boosting on a superchanger, It will be a monster up top if you can get it to 7000rpm +, woah ! If I was gonna play around with Cams and timming I would move that power up the High RPM power band to take away from low end wheel spin. With the right cams and timming it will hit like a little turbo chager when the cams come on up top !
Last edited by jgscott; 11-19-08 at 11:48 AM. Reason: added
11-19-08, 01:58 PM
#37
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I would stick with the Head work and cams you're doing. That's so overlooked in F/I, and F/I loves to flow thru heads and valves. Remember a engine is just a air pump. I might add to unless I missed it, back cutting valves, bringing the seats out, deshourding, and reshaping the Combustion Chamber along with CC ing, the heads. and Flow bench testing with someone that is very good with headwork. Also lightening the Valvetrain is a good idea, with things like Titanium valvetrain parts.
Thanks for all the input!
Scotts SC is one of the few that could probably re-sell for near it's original 1997 dealer price. LOL
11-21-08, 09:28 PM
#41
Good luck on the project Scott! Definitely a unique beast you're building there.
-scott
11-22-08, 05:50 PM
#42
Kinda reminds me of this thread ! Ever read this one ? " So you wanna go FI ? "
https://www.clublexus.com/forums/sho...ht=Ding&page=2
Last edited by jgscott; 11-22-08 at 05:51 PM. Reason: add
11-22-08, 06:11 PM
#43
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Kinda reminds me of this thread ! Ever read this one ? " So you wanna go FI ? "
https://www.clublexus.com/forums/sho...ht=Ding&page=2
https://www.clublexus.com/forums/sho...ht=Ding&page=2
