261 lsx v1t
10-04-2016, 03:30 PM
#1
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261 lsx v1t Hi all,
Finally built the 261ci lsx bolted the v1t too it,
We spin the engine at 6000rpm with an 80t crank pulley and 30 t blower pulley. With the step up its spinning the blower at 55200, boost is 14/15psi we're about 750hp.
My question how ever is do I need the ysi? We are maxed out on the v1t and I want more boost /power
Cheers Tom
Finally built the 261ci lsx bolted the v1t too it,
We spin the engine at 6000rpm with an 80t crank pulley and 30 t blower pulley. With the step up its spinning the blower at 55200, boost is 14/15psi we're about 750hp.
My question how ever is do I need the ysi? We are maxed out on the v1t and I want more boost /power
Cheers Tom
10-04-2016, 05:24 PM
#4
9 Second Club
I'd have thought the downstroking would be a good opportunity to spin it higher ?
And how can anyone suggest what blower...when you dont say what power you have, what power you want, or what you're doing with it ?
And how can anyone suggest what blower...when you dont say what power you have, what power you want, or what you're doing with it ?
10-04-2016, 05:57 PM
#5
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As above 750 I'm asking if I need the next size up, we seem maxed out with the v1, could I spin it higher? or best just to go with the ysi? It's producing a lot of heat too would the bigger blower. Running cooler intake temps?
Not much more another 40-50 hp
Not much more another 40-50 hp
10-05-2016, 03:27 AM
#6
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I wouldnt see any point in opting for another small blower.
At least choosing bigger gives you room to grow should you need it. It's hard to go wrong with a YSi
At least choosing bigger gives you room to grow should you need it. It's hard to go wrong with a YSi
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10-05-2016, 09:00 AM
#8
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By comparison, a stock LS1 stroke of 92mm and limiter of 6200 RPM is 3742 FPM or ~62 FPS. You would have to rev your engine to 8300 RPM to see similar piston speeds as a stock LS1. You would have to rev to 10,300 RPM to see similar piston speeds as an LS7 with a stock rev limiter.
Being as how you likely have a FAR superior rod/stroke ratio and I'm guessing a custom forged crank/rod set, you should be able to shrug off 10,000 RPM assuming you can solve the valvetrain/oiling issues.
Moral of the story: You're holding yourself back.
10-05-2016, 12:50 PM
#9
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I'd love to see the valvetrain and oil pump/system to accommodate sustained 10,000rpm vs 6,000rpm.
If 6,000rpm is where he needs to be, he isnt holding anything back.
If 6,000rpm is where he needs to be, he isnt holding anything back.
10-05-2016, 06:42 PM
#10
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if if I put the ysi in with the same pulleys, it should blow more air correct? So boost higher power. Bit more?
10-05-2016, 06:44 PM
#11
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69mm crank at 6000 RPM is a piston speed of 2716 FPM or ~45 FPS.
By comparison, a stock LS1 stroke of 92mm and limiter of 6200 RPM is 3742 FPM or ~62 FPS. You would have to rev your engine to 8300 RPM to see similar piston speeds as a stock LS1. You would have to rev to 10,300 RPM to see similar piston speeds as an LS7 with a stock rev limiter.
Being as how you likely have a FAR superior rod/stroke ratio and I'm guessing a custom forged crank/rod set, you should be able to shrug off 10,000 RPM assuming you can solve the valvetrain/oiling issues.
Moral of the story: You're holding yourself back.
By comparison, a stock LS1 stroke of 92mm and limiter of 6200 RPM is 3742 FPM or ~62 FPS. You would have to rev your engine to 8300 RPM to see similar piston speeds as a stock LS1. You would have to rev to 10,300 RPM to see similar piston speeds as an LS7 with a stock rev limiter.
Being as how you likely have a FAR superior rod/stroke ratio and I'm guessing a custom forged crank/rod set, you should be able to shrug off 10,000 RPM assuming you can solve the valvetrain/oiling issues.
Moral of the story: You're holding yourself back.
cheers
10-05-2016, 07:06 PM
#13
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You'd really need to consult with Vortech as to which unit would be the most efficient in terms of moving air at the rpm/boost you would end up using.
As you're sitting at a steady engine rpm most of the time, that should make it much easier to decide between them as to which compressor is easiest driven and most efficient.