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ATTN: Important Topic: Changing Lift on VVTLi #65750 Dec 6, 3:24pm Dec 6, 3:24pm
Joined: Dec 2002
Posts: 1,660
Houston, TX
2001 Spec Blue Toyota Celica
Grand-Touring-Dan OP
ECelica Staff
2001 Toyota Celica
Grand-Touring-Dan OP
2001 Spec Blue Toyota Celica
ECelica Staff
2001 Toyota Celica

Joined: Dec 2002
Posts: 1,660
Houston, TX
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.

Re: ATTN: Important Topic: Changing Lift on VVTLi [Re: Grand-Touring-Dan] #65751 Dec 6, 5:59pm Dec 6, 5:59pm
Joined: Nov 2003
Posts: 106
Irving, Texas
BHayes____ZZT231
Member
1990 Nissan 240SX Coupe!!! not a
BHayes____ZZT231
Member
1990 Nissan 240SX Coupe!!! not a

Joined: Nov 2003
Posts: 106
Irving, Texas
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



Re: ATTN: Important Topic: Changing Lift on VVTLi [Re: Grand-Touring-Dan] #65752 Dec 6, 6:00pm Dec 6, 6:00pm
Joined: Aug 2003
Posts: 2,926
Arizona
celicaTRDgts
Specialist
02 Toyota Celica
celicaTRDgts
Specialist
02 Toyota Celica

Joined: Aug 2003
Posts: 2,926
Arizona
yea good info...kinda ha thumbsup


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Re: ATTN: Important Topic: Changing Lift on VVTLi [Re: BHayes____ZZT231] #65753 Dec 6, 6:48pm Dec 6, 6:48pm
Joined: May 2003
Posts: 5,346
LA
S
spaztikid
dikitzaps
1974 Toyota Celica
spaztikid
S
dikitzaps
1974 Toyota Celica

Joined: May 2003
Posts: 5,346
LA
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.

Re: ATTN: Important Topic: Changing Lift on VVTLi [Re: Grand-Touring-Dan] #65754 Dec 7, 6:41pm Dec 7, 6:41pm
Joined: Dec 2002
Posts: 1,660
Houston, TX
2001 Spec Blue Toyota Celica
Grand-Touring-Dan OP
ECelica Staff
2001 Toyota Celica
Grand-Touring-Dan OP
2001 Spec Blue Toyota Celica
ECelica Staff
2001 Toyota Celica

Joined: Dec 2002
Posts: 1,660
Houston, TX
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