Tec-Arts modified intake cam gear

Kuromi_loves_toyota
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Tec-Arts modified intake cam gear

Postby Kuromi_loves_toyota » Mon May 08, 2023 1:55 am

ive heard some rumors about a modified intake cam gear for the 20v, i recently got some cams from toda and im looking into the cam gear modification. can anyone give me any information on this? could this improve the reliability/drivability of my engine in the long term?

thank you.
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jondee86
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Re: Tec-Arts modified intake cam gear

Postby jondee86 » Tue May 09, 2023 12:21 am

Is it this ?

Image

Or something else ?

Cheers... jondee86
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persists in trying to adapt the world to himself. Therefore, all progress
depends on the unreasonable man.

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oldeskewltoy
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Re: Tec-Arts modified intake cam gear

Postby oldeskewltoy » Tue May 09, 2023 10:30 am

bottom of page - it's a service they offer for use with their 296 cams. I'd assume you could use it with other cams too...

Image
OST Cyl head porting, - viewtopic.php?f=22&t=300

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jondee86
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Re: Tec-Arts modified intake cam gear

Postby jondee86 » Tue May 09, 2023 3:33 pm

Ahhhh... modified intake VVT pulley. At the top it says the 296 cams will work OK
without VVT, which is another way of saying they won't work nicely with the stock
VVT pulley. TODA and others sell adjustable intake cam pulleys to eliminate the VVT
altogether on high duration cams.

Setting the cam timing at a fixed advance works OK on race engines where smooth
off-idle performance is not important. But if long duration cams are used on a DD
then the TEC-VVT pulley mod might save the driver some embarrassment when
negotiating the car park at the mall :)

Quite a few years ago I did come across an article where someone modified the
internals of a factory VVT pulley by inserting a pin to restrict or change the range
of advance provided by the pulley. Can't find the article again and don't remember
the outcome.

Basically, the OEM VVT is optimised to work with OEM cams on a stock engine. As
soon as the cams are changed all bets are off unless the car has a programmable
ECU. Then VVT operation can be dyno tuned to work in harmony with all other mods.
Even then the VVT is more likely to just be a nuisance as it is either ON or OFF and
that limits its usefulness. Modern engines use VVTi (usually on both cams) where cam
advance curves can be programmed into the ECU. That works better than OK :D

cheers... jondee86
The reasonable man adapts himself to the world; the unreasonable one
persists in trying to adapt the world to himself. Therefore, all progress
depends on the unreasonable man.