Previous Thread
Next Thread
New Reply
Print Thread
Joined: Dec 2002
Posts: 1,660
Grand-Touring-Dan
ECelica Staff
Grand-Touring-Dan
2001 Spec Blue Toyota Celica
ECelica Staff
2001 Toyota Celica

Joined: Dec 2002
Posts: 1,660
Houston, TX
Dec 6, 3:24pm - #65750 
ATTN: Important Topic: Changing Lift on VVTLi

Quoted by Monkeywrench:

Using the PFC, we fully tuned the 2ZZ in using ONLY the small cam, then ONLY the large. Then we overlaid the graphs. Drum roll please... the crossover occurred at about 6300 RPM. We got our best results during tuning the switchover by changing over at 6000 or slightly after because of the time the VVTi actuator takes to react.

See results at:

http://monkeywrenchracing.com/mwr_celica_gts.html

Why did we do this? To get people to FINALLY stop requesting a way to change over to the large cam earlier. You'll lose power, and here is the proof. We successfully did change the VVL point with the stock ECU over a year ago, the results were poor though. The reason is that the big cam dosen't offer an advantage until after 6000 RPM. Plus, if you're using the stock ECU, you can't get tune the VVL to work with the earlier VVT.

With the addition of a turbo this changes. More on that later

Note: Honda switches to the large cam profile later than optimal for whatever reason, which is why VTEC controllers help those engines. Toyota did not make the same choice in their tuning.

Joined: Nov 2003
Posts: 106
BHayes____ZZT231
Member
BHayes____ZZT231

Member
1990 Nissan 240SX Coupe!!! not a

Joined: Nov 2003
Posts: 106
Irving, Texas
Dec 6, 5:59pm - #65751 
So its best to leave the VVTL-i alone, You'll lose horsepower? huh who woulda thunk it

Is this bad news for all the people who want the second cam lobes to engage quicker? cry

Good Info thumbsup thumbsup...kinda


1990 Nissan 240SX Coupe
http://www.cardomain.com/memberpage/745257 <---my car
PFC #147

Still got love for the Celi



Joined: Aug 2003
Posts: 2,926
celicaTRDgts
Specialist
celicaTRDgts

Specialist
02 Toyota Celica

Joined: Aug 2003
Posts: 2,926
Arizona
Dec 6, 6:00pm - #65752 
yea good info...kinda ha thumbsup


[Linked Image]
Joined: May 2003
Posts: 5,346
spaztikid
dikitzaps
spaztikid
dikitzaps
1974 Toyota Celica

Joined: May 2003
Posts: 5,346
LA
Dec 6, 6:48pm - #65753 
Originally Posted by BHayes____ZZT231
So its best to leave the VVTL-i alone, You'll lose horsepower? huh who woulda thunk it

Is this bad news for all the people who want the second cam lobes to engage quicker? cry

Good Info thumbsup thumbsup...kinda


this is good news...now there is a definate answer and people know that there wont be any need to change the lift points.

Joined: Dec 2002
Posts: 1,660
Grand-Touring-Dan
ECelica Staff
Grand-Touring-Dan
2001 Spec Blue Toyota Celica
ECelica Staff
2001 Toyota Celica

Joined: Dec 2002
Posts: 1,660
Houston, TX
Dec 7, 6:41pm - #65754 
bump

Join the conversation - Register Now or Log In to add your comment


Moderated by  isaac 

Member Spotlight
jenn1356
jenn1356
2000 Toyota Celica GT
Kentucky

Posts: 162
Joined: April 2004
Thanks: MB AutoSports for my fist body kit (Blitz) and the wing, Import Innovations for a heck of a fiberglass job and to Josh Hill for making i8 all happen.
Random: Stupid evil squirrels
Show All Member Profiles 
Shout Box
Recent Topics
E-brake and seized brake caliper
by osirhc17. 04/27/2017 10:27 AM
TradingGTS for GT what should I know.
by GTS25430. 04/24/2017 5:19 PM
Does 01' corolla struts swap in an 01' celica GT?
by Frostysnowman92. 04/24/2017 1:22 PM
WTB: 00-02 amp bypass harness
by MJ00GTS. 04/18/2017 7:36 PM
Does not seem to be much activity for the 5th gens???
by Coop301. 04/18/2017 7:51 AM
Cold wet weather hesitation
by GTS25430. 04/17/2017 6:15 AM
00-02 premium 8spkr 2din gps solutions?
by MJ00GTS. 04/17/2017 2:24 AM
WTB: valve assy, vacuum switch
by hydraea. 04/15/2017 5:32 PM
Customize Your Toyota Celica Privacy Policy · About · Contact
Privacy Policy · About · Contact
CelicaHobby.com is an independent Toyota Celica enthusiast website. CelicaHobby.com is not sponsored by or affiliated with Toyota Motor Sales, USA, Inc. in any way. The Toyota and Celica names and logos are trademarks owned by Toyota Motor Sales, USA, Inc.
© CelicaHobby.com, 2001-2017
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Snapshot build 20170416)