NA Build: Kacz07's 2006 SS 350z RevUP
06-20-2011, 07:50 AM
#421
Nice vid and sound is very crisp. How does it sound at idle?
By the way, how are you liking your willwoood compared to your brembos?
Good and bad thing about cars is that there is always something to tinker with. It keeps the blood flowing in our veins. Keep up the good work!
By the way, how are you liking your willwoood compared to your brembos?
Good and bad thing about cars is that there is always something to tinker with. It keeps the blood flowing in our veins. Keep up the good work!
06-20-2011, 01:25 PM
#423
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I run the Ferrea valvetrain that IPP offers in their engine packages. I spoke to JWT and Ferrea before i built the engine and JWT recommended I used their valve springs because they optimized their springs with their cams. Ferrea said their springs were stronger, so they should hold up fine, but I will definitely revisit this inquiry.
I'm going to call IPP and Ferrea and ask them about safe rpm limits for the valvetrain/motor. Cams are still a ways off in the future, but it will pay dividends to have this info out there before I make my next move.
I'm going to call IPP and Ferrea and ask them about safe rpm limits for the valvetrain/motor. Cams are still a ways off in the future, but it will pay dividends to have this info out there before I make my next move.
and also came to find out there are only a couple places in the world that actually make the cams, so saying to a customer that their springs are made for the cams really doesnt hold a lot of weight in my mind, since all brands pretty much come from the same build shop, but this is imo too
Last edited by mgrotel; 06-20-2011 at 01:41 PM.
06-20-2011, 01:30 PM
#424
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with the longer stroke, you need to consider piston speeds at high rpm. combine that with no oil squirters and i would be very cautious to go much higher than stock. because even if you keep the same rpm limit as stock, you will have higher piston speeds because of the longer stroke. just dont ruin your engine trying to get some extra rpms, imo
06-20-2011, 05:08 PM
#426
of course jwt will say use their springs, they want to sell their product. i had the same discussion with BC. but in talking with someone experienced with building and working these heads, i came to the conclusion that the small extra cost of dual valve springs was well worth it for what i would be doing with the car.
Also you don't want to over-spring the engine either, especially with the labor intensive valvetrain the VQ has.
06-20-2011, 06:19 PM
#427
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I know what you're saying, I just decided to stick to the advice of someone with tons of vq head experience, and with many high HP builds under their belt. There was a thread here somewhere where a single spring motor had valve float over 8000rpm, but I don't remember the exact thread. They had to rebuild the entire motor, I'll see if I can find it. I'd rather be over sprung than under sprung, if "sprung" is even a word in that context, lol
06-20-2011, 07:07 PM
#428
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unless you're t-pain! lol i keed i keed
judging by the specs....the bc springs are stiffer than the jwt springs. but i got a hella good deal on my cams/springs/retainers which is why i went with all BC valvetrain. my guess...once i get it tuned and dyno'd.....we'll see where my powerband starts to drop and ill set my rev limit just above that......no point in rev'n out higher than what the power runs up to.
judging by the specs....the bc springs are stiffer than the jwt springs. but i got a hella good deal on my cams/springs/retainers which is why i went with all BC valvetrain. my guess...once i get it tuned and dyno'd.....we'll see where my powerband starts to drop and ill set my rev limit just above that......no point in rev'n out higher than what the power runs up to.
06-21-2011, 12:16 PM
#430
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unless you're t-pain! lol i keed i keed
judging by the specs....the bc springs are stiffer than the jwt springs. but i got a hella good deal on my cams/springs/retainers which is why i went with all BC valvetrain. my guess...once i get it tuned and dyno'd.....we'll see where my powerband starts to drop and ill set my rev limit just above that......no point in rev'n out higher than what the power runs up to.
judging by the specs....the bc springs are stiffer than the jwt springs. but i got a hella good deal on my cams/springs/retainers which is why i went with all BC valvetrain. my guess...once i get it tuned and dyno'd.....we'll see where my powerband starts to drop and ill set my rev limit just above that......no point in rev'n out higher than what the power runs up to.
for example, say peak is at 7500rpm with 300hp, 7200rpm has 280hp, and 7800rpm has 290hp. would you rather shift at peak and take the steeper power dropoff, or hold till 7800 and then absorb less of that pre-peak dropoff since you wont fall as short in the rpm range because of the later shift? which one has the higher area under the curve? area under the curve is much more important to me than peak power is anyway.
06-27-2011, 05:47 PM
#432
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I know what you're saying, I just decided to stick to the advice of someone with tons of vq head experience, and with many high HP builds under their belt. There was a thread here somewhere where a single spring motor had valve float over 8000rpm, but I don't remember the exact thread. They had to rebuild the entire motor, I'll see if I can find it. I'd rather be over sprung than under sprung, if "sprung" is even a word in that context, lol
07-04-2011, 08:03 PM
#438
2004, i posted jmccarty's dynos earlier in my this thread. As for the fly-bys, dude is working on fixing my bodykit. I'm going to Cali to visit a grad school, so I'll be away for a bit.
Coupe, post 'em up!
Coupe, post 'em up!
Last edited by kacz07; 07-04-2011 at 08:05 PM.