Have any of you gotten the chance to take out your intake manifold. Have you guys seen whats under the intake that big bubble well in there is 6 different runners with 6 flaps that open and close just like a throttle body. What would guys think of taking that off and running the car with out it. I think that this causes alot of turbulence and slows down the car. Im thinking of taking this off and dynoing the car and then dyno the car with it. I think this might give you a little bottom end but alottttt more top end.
Double throttle body
- Thread starter NosNsx
- Start date
Try it and let us know how you like it.
The Acura Integra GSR has the same setup...a lot of honda tuners are disabling the IAB (Intake Air Bypass) for that same reason you stated. One thing to note is that the Integta Type-R does NOT use this. (which is basically the same motor but has higher output). A standard upgrade procedure when building a GSR motor is to swap a type-r intake manifold for that reason. You should get a little bit better top end, but im not sure if the NSX ECU will through a code for disabling it...
EDIT: i just re-read nosnsx's post:
"I think this might give you a little bottom end but alottttt more top end."
I read it first as i think it might give you a little less bottom end but alotttttt more top end."
It's a TRADEOFF, there's no way you will get both low and top end by removing it (in a stock-like setup)..BUT, I wouldn't be suprised for a second if the tradeoff is worth it though with nitrous...since its basically torque in a bottle. you need to dyno with and without...
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jack of all trades, master of some.
[This message has been edited by true (edited 01 August 2002).]
Isn't that the dual stage intake system(forgot the abbreviation, but check the FAQ)? It opens and closes to alter air velocity and volume to give the optimal intake velocity at given RPMs. I wouldn't touch it unless you convert to full individual throtle bodies which replaces the entire intake manifold.
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G Dummy~
if you think I'm selling my go-fast parts to go back to stock, you are way wrong my friend
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G Dummy~
if you think I'm selling my go-fast parts to go back to stock, you are way wrong my friend
You guys would have to take it apart an see it for yourself. Its 6 flaps that open and close and under the flaps its just a oval looking pan that must create so much turbulence its ridiculous. I bet I will pick up at least 10 hp on the dyno just by removing that.
Lud is absolutely right. The NSX engineers were a lot smarter than you think. That's not just a bunch of flaps making turbulence, it's the variable intake runners (Variable Volume Induction System, or VVIS). The butterfy valves open and close at 4800 rpm to introduce a secondary plenum located below the initial intake runners to add torque and improve power.
[This message has been edited by ChopsJazz (edited 01 August 2002).]
[This message has been edited by ChopsJazz (edited 01 August 2002).]
Yes your wright about more power at the bottom end but without it it will give you more top end. Come on look at the supra and honda's making 600 hp and up do they have any of these gizmos.
I'm sure NosNsx knows more than the Honda engineers how to make power at the top end. They probably just didn't notice this great opportunity to get additional power "for free".
I think you should go for it! What have you got to lose? Just make sure you do a dyno before and after so you can see exactly what the effect is.
I think you should go for it! What have you got to lose? Just make sure you do a dyno before and after so you can see exactly what the effect is.
Yep.
And that stupid VTEC mechanism just adds useless weight.
I think it should just be locked on the high-RPM cam profile and the hell with the low RPM efficiencies.
-Jim
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1992 NSX Red/Blk 5 spd #0330
1991 NSX Blk/Blk Auto #3070 (Sold)
1974 Vette 454 4 spd Wht/Blk
http://homepage.mac.com/jimanders/PhotoAlbum1.html
And that stupid VTEC mechanism just adds useless weight.
I think it should just be locked on the high-RPM cam profile and the hell with the low RPM efficiencies.
-Jim
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1992 NSX Red/Blk 5 spd #0330
1991 NSX Blk/Blk Auto #3070 (Sold)
1974 Vette 454 4 spd Wht/Blk
http://homepage.mac.com/jimanders/PhotoAlbum1.html
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Sorry, I thought maybe you should at least know what a system is called before you decide to re-engineer it. But I'm just a boring old fuddy-duddy.
I also just wrote a really long (~500 words!) fuddy-duddy technical reply about the nature of the VVIS system as it relates to naturally aspirated cars, nitrous, and forced induction, as well as what parts of the system could feasibly be removed and the likely result, but now I decided to delete it and instead simply say:
GO 4 IT, DUDE!!!!!!!
I also just wrote a really long (~500 words!) fuddy-duddy technical reply about the nature of the VVIS system as it relates to naturally aspirated cars, nitrous, and forced induction, as well as what parts of the system could feasibly be removed and the likely result, but now I decided to delete it and instead simply say:
GO 4 IT, DUDE!!!!!!!
He's not claiming to get free power that honda engineers couldn't find. (I think)....he understands it's a tradeoff...will lose some low end torque, but possibly some gain some high end. On a flow bench it will absolutely flow better without...and like i said in a previous thread ALL the fastest honda's in the WORLD do not use that setup..they remove it immedietly. Removing it on a STOCK motor would be redicluous...now i think nosnsx was running 200hp shot of nitrous though.
Lud why did you delete your write-up? I would like to read it. Have you dyno'ed NA and FI setup's with and without back-to-back?
EDIT: i just re-read nosnsx's post:
"I think this might give you a little bottom end but alottttt more top end."
I read it first as i think it might give you a little less bottom end but alotttttt more top end."
It's a TRADEOFF, there's no way you will get both low and top end by removing it (in a stock-like setup)..BUT, I wouldn't be suprised for a second if the tradeoff is worth it though with a big nitrous shot...since its basically torque in a bottle. you need to dyno with and without...
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jack of all trades, master of some.
[This message has been edited by true (edited 01 August 2002).]
No, because they use forced induction. Either that or they have no low-end torque.
My guess would be if you remove it, you'd gain a little top end power, and lose a lot of bottom end. As someone else mentioned, that may not matter much with nitrous. Be sure and dyno with and without if you try it.
