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Post by joshinator99 on Apr 3, 2019 15:42:48 GMT -5
Wiseco is a great choice. Good quality stuff!
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Post by Sabertooth on Apr 3, 2019 17:43:41 GMT -5
Only concern is the power level. They don't rate their pistons... Where as the Manley ones I had were 1200hp, and the step down was 600hp rated.
I guess I'll find out what they'll do...
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Post by joshinator99 on Apr 3, 2019 19:03:23 GMT -5
It will really all be about ring land thickness, wonder how the Wisecos will stack up to the Manleys. Don’t make the ring gap too tight. Oh, and don’t run lean... lol
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Post by Sabertooth on Apr 4, 2019 5:56:33 GMT -5
Was probably gonna do 8 thou ring gap. But I'll see what Wiseco says. 8 is Manley's "30+" psi gap. I could go huge, but I like keeping oil in my engine, not just my catch can
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Post by namelessfoe on Apr 4, 2019 19:23:59 GMT -5
Sucks about Manely. You would think they would own up to their own mistakes, but no one does anymore. Between 6 and 8 thou should be good.
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Post by joshinator99 on Apr 4, 2019 19:39:23 GMT -5
Sucks about Manely. You would think they would own up to their own mistakes, but no one does anymore. Between 6 and 8 thou should be good. 6 to 8 thousandths is really tight (at least in the Camaro world..)! I’m interested to see what Wiseco thinks. |
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Post by Sabertooth on Apr 4, 2019 20:27:43 GMT -5
Manley is down in the 3.5-5 area on their website for "nitrous and boosted"
I sent them an email, will call tomorrow probably as well
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Post by Sabertooth on Apr 8, 2019 16:52:59 GMT -5
New pistons are here! And gone! I took them to the machine shop as soon as they were delivered.
They're not as pretty (shiny) as the Manley pistons, but fuck was Wiseco ever good to deal with. Got suggested ring gap and piston to wall clearance for a 45psi 1000hp engine from them over the phone instead of a generic spec sheet. Ended up being the same as Manley's measurements, which makes sense as they're the same material. The coatings MAY be different, who knows.
3.5 thou piston-wall (2.5 is their standard for boosted motors), and 27-28 thou ring gap
Mid next week I should be able to start re-assembly of a show and track quality 4G69, ready to break records. Probably not this year though. The pistons have a break in-hardening procedure, so should see some mileage before they see huge boost, plus I have to do a second motor build for my daily
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Post by joshinator99 on Apr 8, 2019 20:39:09 GMT -5
Good news! Glad to hear Wiseco came through.
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Post by namelessfoe on Apr 11, 2019 19:00:35 GMT -5
Great, you can give us a how to build a turbo set up tutorial soon. lol.
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Post by Sabertooth on Apr 12, 2019 6:01:20 GMT -5
How to Turbo is no big deal. I can write one of those out. The toughest parts are the manifold and downpipe.
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Post by namelessfoe on Apr 17, 2019 19:19:24 GMT -5
you gonna wastegate to atmosphere or do a tie in? Also read an interesting article today about having a second wastegate on intake piping to maintain boost pressure off the line.
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Post by Sabertooth on Apr 18, 2019 9:49:10 GMT -5
I'll probably do a screamer pipe. I won't hit full boost very often, so it won't be affecting the drivability by having it.
How a wastegate on the intake piping would allow you to have boost pressure on the line confuses me. Unless it's pulling pressurized air from somewhere, it wouldn't. A wastegate doesn't even open until full boost.
What you can do is use a blow off valve. They reduce pressure of the intake piping by opening a route to atmosphere instead of a closed throttle plate, allowing the turbine to hold its RPM if it's already spinning. I'll be using 2 of those, with enough flow for 2-3x my airflow levels (1800hp BOV and a mystery one built in to the 1200hp turbo)
To have boost off the line you need to get the turbine to spin. You can do that by adjusting engine spark timing so that it doesn't ignite the fuel until the exhaust valves are open. I have that on my daily, can do 15psi off the line with a 3500rpm launch. Not much need for it on this build though. It's a circuit car build not a drag racer. Nitrous should take care of lag down low anyway when needed
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Post by namelessfoe on Apr 18, 2019 18:28:17 GMT -5
Nice, Yeah, the article was talking about battling the fluctuation of boost pressure on the intake side while raising rpm for launching. I'm all about the 1/4.
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Post by Sabertooth on Apr 18, 2019 20:31:29 GMT -5
Depends how you do it and what your setup is. You don't want waves bouncing off a closed throttle body coming back at the turbo, but you also don't want to lose all your boost either. Higher RPM and a less aggressive anti lag can help with that
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