Butterfly valve removal

|2ED-LINE · Apr 30th, 2003, 04:18 PM

i think i read on the b25.net forum that a spec with many mods including "butterfly vavle removal / kept open" made a time of 13 sec........wat i am wonderin is, wat is a butterfly valve?

|2ED-LINE · Apr 30th, 2003, 04:19 PM

sorry b15.net forum, not 25....hehe

cademetz · Apr 30th, 2003, 06:07 PM

I beleive the QR25 had dual intake runners, a long and short runner. The long runner for low RPM, short runner for high RPM. The valve switches between runners.

I have a hard time beleiving that simply removing this valve can increase the 1/4 time that much. But that's just me.

Nismoist · Apr 30th, 2003, 08:38 PM

Do you have a link to this thread? I'm with Cademetz on this one. Sounds a bit too much, even with "many mods".

|2ED-LINE · Apr 30th, 2003, 10:04 PM

http://www.b15sentra.net/forums/show...=13second+club
check under the 13 second column and u would see Mikee's spec v mods according to the key below

Raverjames21 · May 1st, 2003, 01:30 AM

He had N2O. That helps alot more than the butterfly thing.

cademetz · May 1st, 2003, 07:19 AM

Yeah, his mods are:

Intake
Headers
Butterfly Removal
SLICKS
SUspension
Balance Shaft Removal
Race Fuel
NOS

The huge part of his good time is coming from the NOS and Slicks.

May 1st, 2003, 08:59 AM

Right on... this is called a VIAS by Nissan and has a very limited effect only at RPM in excess of 5000 when it activates.

I beleive the QR25 had dual intake runners, a long and short runner. The long runner for low RPM, short runner for high RPM. The valve switches between runners.
I have a hard time beleiving that simply removing this valve can increase the 1/4 time that much. But that's just me.

**chimmike** · May 1st, 2003, 09:20 AM

There's dyno proof that with bolt ons and everything people lost power by keeping both runners open.

Unless you're running massive nitrous, don't screw with that stuff.

|2ED-LINE · May 1st, 2003, 04:14 PM

icic.......thx fo the inputs