IS-F Headers
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Joined: Jan 2009
Posts: 264
Likes: 0
From: BC, Canada
I seriously doubt there will be a strong aftermarket for the ISF. Its been a year and a half now since release in the states and we honestly have 1 maybe 2 exhaust options, 1 maybe 2 intake options and a ECU tuning option that didnt work. All this makes me wonder if there really is any room left on the ISF for much more power. Other than intake, exhaust, ECU, and maybe headers we would be lucky to get 40-60 rwhp out of the ISF and the aftermarket knows this along with the expense of development and limited number of cars and limited number of people wanting to make that jump to get that little power possible, they along with I just dont see it. If this car was boosted from the factory it would be a different story but even with the ability to slap on turbos or maybe a supercharger the ISF engine really isnt built or initially designed for it and would require a ton of tuning and possibly engine internals to really make it worth it along with transmission mods(IMO only someone with deeeeep pockets could make it work). Honestly the ISF might need a bit more hp but if it was alot of power it would upset the balance of this car and make it something the ISF wasnt meant to be. The ISF is no toyota supra and toyota hasnt released a car with its tuning ability/ potential since.
I highly doubt 60whp from those mods as the stock headers are pretty good and our primary stock cats are already high flowing. I was told by a lexus technician about the cats being high flow but who knows if they are or not.
Anyhow the ISF engine reminds me of a Honda S2000/Acura type R engine as they are already tweeked from factory so you won't gain much out of simple bolt on mods. My old S2000 bolt on mods I did intake/header/headerback exhaust/throttle body and ECU tune and I only managed to squeeze 30 whp midrange and 20whp peak. So I would assume from a tweeked factory engine it would probabely produce similair gains with the ISF.
I was also told by another car modding shop owner who tried making custom headers for a IS350 which they said it lost hp comparing to stock and they did lots of R&D to try and make it right but failed. To the ISF's conclusion, unless a proper standalone system or EMS is made for our car then longtube headers/intake/exhaust and proper tune might come close but there isn't any EMS that succeeded in hacking the ISF's ecu. If there was it would of came out long time ago...
Last edited by ISF-88; Aug 16, 2009 at 05:19 PM.
Lexus Fanatic
iTrader: (10)
Joined: Nov 2004
Posts: 13,441
Likes: 1,076
From: Under an IS F since 2008
You mean this UN-TUNED 0-60 Magazine / IS-F black beauty from SEMA 2008 ??? 
Engine Modifications
• Greddy MP92 Supercharger w/ custom aluminum intake manifold
• Greddy Intelligent Informeter Touch
• Greddy Intake and filter
• Braille Carbon Battery
Photo I personally took...
Joe Z
Engine Modifications
• Greddy MP92 Supercharger w/ custom aluminum intake manifold
• Greddy Intelligent Informeter Touch
• Greddy Intake and filter
• Braille Carbon Battery
Photo I personally took...
Joe Z
yes that would be the one....my point was it can be done. i said nothing about tuning but if lexus wanted its an option and they could provide the tune. (and it would not be anywhere near the 20grand the guy above said).
You mean this UN-TUNED 0-60 Magazine / IS-F black beauty from SEMA 2008 ???
Engine Modifications
• Greddy MP92 Supercharger w/ custom aluminum intake manifold
• Greddy Intelligent Informeter Touch
• Greddy Intake and filter
• Braille Carbon Battery
Photo I personally took...
Joe Z
Engine Modifications
• Greddy MP92 Supercharger w/ custom aluminum intake manifold
• Greddy Intelligent Informeter Touch
• Greddy Intake and filter
• Braille Carbon Battery
Photo I personally took...
Joe Z
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Redefining Lexus Aftermarket Parts Since 2001
-- We are your Lexus suspension experts--
BCR - KW - PENSKE - OHLINS - HKS - GREDDY - STANCEPARTS
Links - Arms - SuperPro Poly Bushings - Solid Bearing Conversions - Motor Mounts
RB BBK's and 2P Rotors, G-Loc pads, Radium Fuel Systems
Custom Fabrication Design and Machining - Industrial 3D Printing - Laser Cutting
2018 USTCC Sportsman Class Champions - 2018 NASA ST5 National Champions
Lexus Champion
Joined: Sep 2007
Posts: 2,279
Likes: 2
From: Pembroke Pines, FL
Another company JE Import Performance out of Maryland according to the LexusF.com thread is developing headers for the F. I have no experience with these guys. I guess we will wait and see what happens.
Click the link....http://www.lexusf.com/forums/showthread.php?t=1730
Click the link....http://www.lexusf.com/forums/showthread.php?t=1730
Pole Position
Joined: Mar 2008
Posts: 295
Likes: 0
From: Alabama
damn is-f and gtr?!!?! ****ing sick bro...what do you do and how can i do it
Pole Position
Joined: May 2009
Posts: 216
Likes: 27
From: Tampa, FL
