ls1 throttle body hole size calculator

Programs / Tools / Scripts
Wade
Posts: 562
Joined: Mon Jul 11, 2016 6:29 am
cars: Vr 5.0 statesman vr exec 5.0 turbo vy clubsport

ls1 throttle body hole size calculator

Post by Wade »

i found this online. may help with you cammed ls1 owners
Attachments
TB Hole Calculator.xls
(27.5 KiB) Downloaded 838 times
User avatar
antus
Site Admin
Posts: 8237
Joined: Sat Feb 28, 2009 8:34 pm
cars: TX Gemini 2L Twincam
TX Gemini SR20 18psi
Datsun 1200 Ute
Subaru Blitzen '06 EZ30 4th gen, 3.0R Spec B
Contact:

Re: ls1 throttle body hole size calculator

Post by antus »

Thanks for posting, Ive added this as as sticky so it'll remain findable.
Have you read the FAQ? For lots of information and links to significant threads see here: http://pcmhacking.net/forums/viewtopic.php?f=7&t=1396
OZ38
Posts: 288
Joined: Wed Jul 01, 2009 7:18 pm
cars: VY V6 Commodore ute.
VS V6 Commo sedan.
VT V6 powered 4x4 Hilux ute.

Re: ls1 throttle body hole size calculator

Post by OZ38 »

Can someone explain this a little more for me please.
As I have a cammed L67 with the LS1 TB and wonder if it might be helpful in some way.

Cheers
User avatar
Holden202T
Posts: 10311
Joined: Sat Feb 28, 2009 9:05 pm
Location: Tenambit, NSW
Contact:

Re: ls1 throttle body hole size calculator

Post by Holden202T »

i believe what this is referring to is the hole in the throttle blade of the throttle body, which will constantly bleed air into the motor.

if you chuck a big cam in the engine and it needs more throttle opening to idle (or in this case IAC open) then you can use that to calculate the hole needed to be drilled in the TB to get the IAC back to the right setting.

big cams also tend to have less vacuum and because of this are more prone to stalling and having idle issues if the air bleed is too small, add to that if you actually open the throttle stop too far it will go out of idle mode because the TPS will be reading 1-2% open.

i've also found this to be a bit of an issue in my race car where i do have a large cam and also have no PCV (air bleed) so theres less air leaks in the system than normal, so needed to put a small hole in the buttlerfly.
OZ38
Posts: 288
Joined: Wed Jul 01, 2009 7:18 pm
cars: VY V6 Commodore ute.
VS V6 Commo sedan.
VT V6 powered 4x4 Hilux ute.

Re: ls1 throttle body hole size calculator

Post by OZ38 »

Thanks for that. Makes sense now.
OZ38
Posts: 288
Joined: Wed Jul 01, 2009 7:18 pm
cars: VY V6 Commodore ute.
VS V6 Commo sedan.
VT V6 powered 4x4 Hilux ute.

Re: ls1 throttle body hole size calculator

Post by OZ38 »

I have downloaded the attachment, but can't seem to get any input on to it ? What am I doing wrong, maybe it doesn't work for a tablet.
Charlescrown
Posts: 1831
Joined: Sat Aug 06, 2011 7:58 am
cars: V8 VR Commodore BT1
LB Lancer 2L turbo & Delco
Starion TBI with Delco
Mitsubishi Lancer EVO4 track car
NA MX5
3 vintage motor bikes
Location: Padstow NSW

Re: ls1 throttle body hole size calculator

Post by Charlescrown »

At the top of your excel screen in yellow you need to click enable editing. Should work then.
OZ38
Posts: 288
Joined: Wed Jul 01, 2009 7:18 pm
cars: VY V6 Commodore ute.
VS V6 Commo sedan.
VT V6 powered 4x4 Hilux ute.

Re: ls1 throttle body hole size calculator

Post by OZ38 »

Ok thanks, will give it a try.
OZ38
Posts: 288
Joined: Wed Jul 01, 2009 7:18 pm
cars: VY V6 Commodore ute.
VS V6 Commo sedan.
VT V6 powered 4x4 Hilux ute.

Re: ls1 throttle body hole size calculator

Post by OZ38 »

I have a VS V6 cammed L67 with a Kalmaker Map Tune, running a LS1 TB.
Can I use TunerProRT to scan & read the IAC steps at idle ?
User avatar
Holden202T
Posts: 10311
Joined: Sat Feb 28, 2009 9:05 pm
Location: Tenambit, NSW
Contact:

Re: ls1 throttle body hole size calculator

Post by Holden202T »

if there is an ADF for the version of code your running then yes.
Post Reply