Now, I have a question thats been buggin me for a while:
Exactly what makes the deliciously crisp intake noise of an ITB setup?
EXAMPLES:
First is the TVR Sagaris, with a n/a 4.0 liter inline 6 with factory ITBs.
http://www.pistonheads.tv/clip1049
Second is a Nissan Skyline 2000GT-R, n/a 2.0 liter inline 6 with factory ITBs..
http://www.youtube.com/watch?v=BU7L9OawuMI @28 seconds into the vid
Despite a 2.0 liter difference between the engines, they sound surprisingly similar (and I think the Nissan sounds even narlier...).
My Supra is currently undergoing surgery, and I'd contemplated an ITB setup before, but decided against it (daily driver). Even though I'm turbo, I'll be running the 9.2:1 n/a pistons and using the MAFT-Pro for tuning. The MAP sensor for the MAFT dashes any hope of a steady vacuum signal with ITBs anyway.
I've always been kind of dissapointed with how the 7M sounds. Although still far and away better than the JZ engines, 7Ms always seem to have messy harmonics. The engine note might be more at home emanating from a truck than a sports car... I'm hoping the 9.2 pistons will help in the sound department, as well as drivability, the main reason for use.
I'd happily trade horsepower potential in order for my supra to spew out that wondrous noise. I'd much rather have 250HP and that SOUND, than 400HP and a thrashy soundtrack. :biglaugh:
Anyways, I WANT THAT SOUND.
But is it possible without the throttle butterflies?
What if the actual culprits are the velocity stacks? Since the radius of the horn increases the open area of the runner the intake pulse would reflect from, would a stack create a sharper "bark" than a butterfly valve placed closer to the intake valve?
Has anybody ever seen/heard an engine with stacks, but a single throttle body?
Maybe I'm over thinking it. It might be something as simple as a tubular header(doubtful, though I've suspected the stock manifold adds to the mushy sound), or maybe its nothing more than the increased valve overlap that an ITB'd engine sports? (In which case my turbo dooms me.)
Any knowledge and experience you guys have would be a help.
Exactly what makes the deliciously crisp intake noise of an ITB setup?
EXAMPLES:
First is the TVR Sagaris, with a n/a 4.0 liter inline 6 with factory ITBs.
http://www.pistonheads.tv/clip1049
Second is a Nissan Skyline 2000GT-R, n/a 2.0 liter inline 6 with factory ITBs..
http://www.youtube.com/watch?v=BU7L9OawuMI @28 seconds into the vid
Despite a 2.0 liter difference between the engines, they sound surprisingly similar (and I think the Nissan sounds even narlier...).
My Supra is currently undergoing surgery, and I'd contemplated an ITB setup before, but decided against it (daily driver). Even though I'm turbo, I'll be running the 9.2:1 n/a pistons and using the MAFT-Pro for tuning. The MAP sensor for the MAFT dashes any hope of a steady vacuum signal with ITBs anyway.
I've always been kind of dissapointed with how the 7M sounds. Although still far and away better than the JZ engines, 7Ms always seem to have messy harmonics. The engine note might be more at home emanating from a truck than a sports car... I'm hoping the 9.2 pistons will help in the sound department, as well as drivability, the main reason for use.
I'd happily trade horsepower potential in order for my supra to spew out that wondrous noise. I'd much rather have 250HP and that SOUND, than 400HP and a thrashy soundtrack. :biglaugh:
Anyways, I WANT THAT SOUND.
But is it possible without the throttle butterflies?
What if the actual culprits are the velocity stacks? Since the radius of the horn increases the open area of the runner the intake pulse would reflect from, would a stack create a sharper "bark" than a butterfly valve placed closer to the intake valve?
Has anybody ever seen/heard an engine with stacks, but a single throttle body?
Maybe I'm over thinking it. It might be something as simple as a tubular header(doubtful, though I've suspected the stock manifold adds to the mushy sound), or maybe its nothing more than the increased valve overlap that an ITB'd engine sports? (In which case my turbo dooms me.)
Any knowledge and experience you guys have would be a help.
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