Hi all,

Just saw this in JWT website and thought I might want to share this with you guys. anyway I'm kind of new in the engine tech thing, but based on what I read. the adjustable cam gears on SUPRAs are one way to gain more control over timing, and get on of those tricky settings for the cams which is hard to be found with stock gear "correct me if I'm wrong". I need your feed back on this product to decide wether to include it in my build or not "DE non revup".

"JWT has just added this set of adjustable VQ exh. cam gears for engine builders intent on gaining the most out of a VQ35 or VQ40 engine, turbo or NA. With eight positions of 2.5 crank degrees each, these gears allow enough adjustment to span a full tooth if needed for infinite cam timing corrections. The gears open up many possibilities like converting Revup engines to run in DE configuration, resetting exhaust cams after altering crank sprocket timing, and just being able to easily explore all cam timing options. Part# AVQ35-EGEAR"


http://www.jimwolftechnology.com/news.asp

thanks,
-meedo

 

Repost

 

i saw these as well.

I think the downfall is there is no access port to the exhaust cams on the non-rev engines so you would have to remove the whole front timing cover to make any changes. Total suck

 

Good point Jeff. and that's why most supras have there timing cover partially open.
one more thing lets say we are in the build/tune time frame "Is there any power gains
over the rpm range that would make me pay the price for something like this, or making
aggressive cams more livable??".

 

Cam timing is adjustable with Haltech EMs and I believe ProEfi

What would be the benefit of mechanically adjusting cam timing?

 

i thought it wasnt adjustable with the 03-05 DE and that was the reason for these cam gears? 06 rev ups and then all of the HR and VHR have adjustable cam timing via EMS. maybe im wrong though ?

 

setting cams is not trival and most tuners never do it to begin with (hance why you never see anyone post an increasing cam degree curve vs steady rpm). Thats the data that needs to be done to properly tune a cam.

No one would ever try setting up an exhaust cam on a non-rev without VVT control

 

On DE's the exhaust cam gear is fixed so if you wanted to adjust it this would be the only solution.

 

That would make sense but that is not the way they are advertising it

"The gears open up many possibilities like converting Revup engines to run in DE configuration, resetting exhaust cams after altering crank sprocket timing, and just being able to easily explore all cam timing options. "

 

It's a product they can sell

for someone that did want to mess with exhaust cam timing they have this option. Truthfully they would probably just convert to a rev-up and do it electronically if they really were that gun-ho about doing it.

I think they are backwards about that. You can just set the cams to zero in tuning to make a rev up engine run like a DE. You can also just use DE heads on a rev-up lower block if you needed a block. You can also just run DE cams in a rev up head to convert them to "de". Injected performance makes cam plugs for the back of the heads for this reason.

 

The exhaust cam phasers really cant get the job done and big power guys have to move to mechanical means of cam timing. The intake side is better since its driven by oil pressure but the electro-magnetic clutch used on the exhaust side just cant keep them in the commanded position sometimes.

 

So based on what meatbag says: this product is functional lets say for someone who runs 600or700+ whp, track his car almost weekly, and still looking to smooth out his runs. plus know that he owns **** loads of money or owns a shop/dyno.

am I right!!!

 

The trouble is access. The amount of time required to make an adjustment and check for power gains is MASSIVE on a VQ35, not like a 2JZ where you can adjust and make a pull. You are talking about tearing down the front cover, which it's best to pull the upper oil pan to reseal properly afterwards. This would require dropping the core support as well. A pretty major operation just to test a few degrees advance/retard. I would swap to revup heads and covers on my block and have electronic control before I went this route.

 

good basically then swapping my heads to revup and using revup harness plus a standalone to control the timing is the way to go even though it's way more expensive, but it's cheeper in the long term !!! OR if it's possible a shop/vendor in the forum might want to design a new timing over as an easy access cams gears replacement ??? could be...

Thanks Hal for the info.

 

does your build really need this? what are you doing with the car?

 

ah, great info. I didn't know the exhaust were electric. i thought they were hydraulic like the intakes.

thanks for the info. Makes plenty of sense.