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Discussion Starter #1
i am looking to do a few more mods before the winter and possibly selling my car. but here are my questions on powerhause's site they say you can upgrade to a tt intake cam to yield more hp in vthe upper rpm after being tuned for poper a/f ratio. any one have any input on these? why still staying non turbo -as i might try it can some one post the na intake and the tt intake cam spec's if this works out it might be cheap upgrade . Also does the is300 have a heat spacer on the intke manifold from the factory? and if so it should work with our cars right. and last didnt someone post that you can use a GM replcament /perf alternator as a replcaemnt for the stock unit with a little bit of splicing just wondering as i want to get a higher amp system- thanks Brett

p.s any one have any vidoes of there non turbo supra on the dyno???
 

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Now I'm beginning to understand why there is so much bad information out there. First, there's absolutely no duration difference between an NA and TT intake cam:
http://www.mkiv.com/specifications/ncf/ncf93/ncf033.jpg
http://www.mkiv.com/specifications/ncf/ncf93/ncf077.jpg

In fact, the GE intake cam has slightly more lift than the GTE intake cam:
http://www.mkiv.com/specifications/ncf/ncf93/ncf040.jpg
http://www.mkiv.com/specifications/ncf/ncf93/ncf081.jpg
You'll get just as good of results with proper tuning of the motor with a GE intake cam.

I also noticed PHR advertises an 8.7:1 for their 3mm hg: http://www.powerhouseracing.com/suprana_turbo.shtml How the heck do they come up with that? Sorry, but I've documented that a 3mm hg compressed on an NA head contributes enough to the clearance volume to drop the CR to ~8:1. Lance Wolrab concurs: "For every millimeter of squish, we get 5.81cc of volume."

I wish these shops would post some supporting info on their results.

-scott
 

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Discussion Starter #3
ok with that in mind could i run a tt intake cam that has a slightly higher lift and or duration say like a hks 256 or 264 ? let me know cause i am looking to do something new for some horsepower. lol it looks like powerhouse has alot of things thats just arent how things are ...
 

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Xdreamer said:
ok with that in mind could i run a tt intake cam that has a slightly higher lift and or duration say like a hks 256 or 264 ?
Yes... But, it's been suggested that the cam stagger should be higher on the exhaust side not the intake side: http://www.to4r.com/techcylinderhead.html It's your call. Do what you want.

...lol it looks like powerhouse has alot of things thats just arent how things are ...
Correct...

-scott
 

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Discussion Starter #5
enuff said, i was jjust trying to see if there was a couple hp to be had with swapping out the intake cam as i have a exhuast cam driven distributor ;-
 

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Xdreamer said:
enuff said, i was jjust trying to see if there was a couple hp to be had with swapping out the intake cam as i have a exhuast cam driven distributor ;-

so if our exhaust cam drives the distributor...why would we need a second adjustable cam gear.... by changing the timing of the cam gear, the distributor timing would change too right? so i could just change the BTDC on the cam gear

or r you supposed to set the cam gears, and then reset the BTDC to stock (+10 right?)
 
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