Spin the engine how high?
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From: Reynoldsburg, Ohio
Spin the engine how high? On my latest dyno sheet (need to get it scanned), I made 433rwhp and 386rwtq on 6psi due to the heat and lack of air flow. This was after 3 hours of tuning by Reckless. I make 8psi on the street when running around in cool weather.
Anyways. My dynograph shows when they let off at 6300 RPMs, I'm still making power. The power curve is still going up substancially, and the torque curve is almost flat. Can I spin the engine any higher? If not, if I were to replace the valvesprings and pushrods only, could I get away with spinning to 6500 or so?
I'm just curious, as the car's not even close to falling flat on it's face at 6300. Mods in sig.
Thanks
Anyways. My dynograph shows when they let off at 6300 RPMs, I'm still making power. The power curve is still going up substancially, and the torque curve is almost flat. Can I spin the engine any higher? If not, if I were to replace the valvesprings and pushrods only, could I get away with spinning to 6500 or so?
I'm just curious, as the car's not even close to falling flat on it's face at 6300. Mods in sig.
Thanks
Re: Spin the engine how high? alot of people spin their stock engines to or past 6500. SO id go for it.
ofcoase spinning it higher tends to wear out engines a little faster, but that should give you a reason to get you a built engine later.
ofcoase spinning it higher tends to wear out engines a little faster, but that should give you a reason to get you a built engine later.
Re: Spin the engine how high? Completely stock motor?
You need a set of stronger valvesprings or you will have problems.
I'd go at least LS6, but I'd also consider 918 Comps.
The blower will move your power peak up like 500 rpms so instead of peaking at like 5950 you might peak at 6450.
But you will float valve and fatigue the heck out of your stock springs. Make it safe first.
You need a set of stronger valvesprings or you will have problems.
I'd go at least LS6, but I'd also consider 918 Comps.
The blower will move your power peak up like 500 rpms so instead of peaking at like 5950 you might peak at 6450.
But you will float valve and fatigue the heck out of your stock springs. Make it safe first.
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From: Grove City Ohio/Port Washington L.I sometimes
Re: Spin the engine how high? Anthony PSJ is right on the money.HP looks good but tq seems a little low for your setup.I see 11s at Norwalk,you you dyno hog you. 
Re: Spin the engine how high? Springs are the first mod, but I think you'd be foolish to spin a FI'd stock bottom anywhere near or above 6500. I don't recall from past threads anyone endorsing revs above 6k for a FI stock engine. rod bolts and wrist pins are potential failure points. Let us know how it works out...
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From: Columbia, MD
Re: Spin the engine how high? My shift-light cuts on at 6200. The rev-limiter is set to 6800. With 4.10 rear-end gears, it takes me about 200 RPMs to see the light out of the corner of my eye, and pull my foot off the gas.
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From: Bellevue, Wa
Re: Spin the engine how high? IMO, want things to last, don't spin the shiznit outta the motor.
pulley the blower to reach your desired max boost by 6,000rpm and your engine will thank you for it.
pulley the blower to reach your desired max boost by 6,000rpm and your engine will thank you for it.
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From: Reynoldsburg, Ohio
Re: Spin the engine how high? 
Sorry for the delay, I transferred jobs this week and am just now able to post back.
Anyways, there's the graph. SInce then, Todd Brandon has added timing where it's rich on recommendation from Mike Brown. We'll see
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Verdad Gallardo Re: Spin the engine how high? Look how well you keep pulling up top, still gainig, you could add alot of HP by spinning it alittle higher.
but it you dont have upgraded valve springs, id get them first.
just make sure your A/F doesnt crep up to high, i see it start to climb alittle up top to.
but it you dont have upgraded valve springs, id get them first.
just make sure your A/F doesnt crep up to high, i see it start to climb alittle up top to.