N/A cams in a 7mgte

[hunka13]

so i keep seeing that it is an upgrade to use n/a cams in a turbo what is the benefit of this what about for a stock motor i did a search for this info but didnt find any thing if someone could lead me in the right direction that would be great thanks

 

[MKIIINA]

search some please as this is a topic thats been beat to death and slightly controversial.

you will end up making about the same power, just moving the peak point around is the short answer, not worth it

 

[gtsfirefighter]

This topic has been beat to death and then some, but, FWIW, I'm running an NA head and cams on my GTE because my GTE head/cams were fubar'd from corrosion due to being exposed to the elements for several years. Supposed to give you around 5 hp gain in low end but hurts your high end power, blah blah blah something like that. Try numerous search topics and you'll find multiple threads on it with good information from people who know what they're talking about, unlike me.

 

[Poodles]

I've said it a million times...

Toyota would have used the same cams in both engines because it was cheaper for them to make one style.

Now think, why would they use a different cam?

 

[JesseH]

I've said it a million times...

Toyota would have used the same cams in both engines because it was cheaper for them to make one style.

Now think, why would they use a different cam?

true, and even if there was a verrry small ammount of power increase, In my mind it still wouldn't be worth it beause you would also have to re-shim all of the valves on top of that.

 

[ArmandoP]

ive driven the same car with both cams. the best description i can ive is that the na cams move the power curve to the left, but the area under the curve is almost identical. however, you WILL lose even more power over 5000 rpm. considering that the 7m likes to fall on its face up top this makes th at condition even worse.

 

[MKIIINA]

I've said it a million times...

Toyota would have used the same cams in both engines because it was cheaper for them to make one style.

Now think, why would they use a different cam?

ohhhh ohhh let me guess! let me, let me!!!!!

umm is it because the intake tract on the NA and the turbo models is different and also because the difference in flow characteristics under forced induction is different than naturally aspirated?!

what do i win? :biglaugh:

 

[Poodles]

an ass kicking at go-carts

 

[hunka13]

well thanks for the info i must not have worded my searches correct other wise i would have known i was opening a can of worms lol

 

[88YotaTurbo]

I did it and I wish I had not!
I have something that will help you out in your decision. It's a dyno graph before and after cam swap. Common mods throughout~ 3" tback, Intake, Dr jones MBC, pump gas. stock ct-26
Pictures: Look at the power curves between the three
1.) 12psi - turbo cams
2.) 12psi - n/a cams
3.) 15psi - n/a cams - Unmetered air trick- ran a steady 11-12 afr too!@

 

[tlo86]

wow look at that TQ!

 

[88YotaTurbo]

Yep it is nice for autocross but not street bashing high rpms. And it tears tires when I'm not using the falken 255 race compounds.

 

[MOTOWNMKIII]

damn that graph is nuts. pulls hard then falls on it's face....worse than normal.

 

[4U2QUIK]

might be nice for people with automatic transmissions?

 

[j3pz]

wow i was condsidering this and that just changed my mind. to ebay they go

 

[foreverpsycotic]

damn that graph is nuts. pulls hard then falls on it's face....worse than normal.

The fall off is not that bad, maybe 20-25whp or so. That torque more than makes up for that falloff however.

 

[Poodles]

depends...

with a bigger turbo, you're SERIOUSLY gonna be hurting as they will spool so late and you won't have the flow to take advantage of it.

 

[88YotaTurbo]

The fall off is not that bad, maybe 20-25whp or so. That torque more than makes up for that falloff however.

And this was with a blown turbo.... remember mike? you just missed the pull but I told you .

 

[88YotaTurbo]

depends...

with a bigger turbo, you're SERIOUSLY gonna be hurting as they will spool so late and you won't have the flow to take advantage of it.

That is the reason why I wish i didn't put them in. Whenever the time comes for a bigger turbo I guess I'll be buying cams too.

 

[deabionni]

The peak torque looks great on the low end, but it lost a lot of area under the curve, as things fall off quick after that peak torque.

Those graphs are more than enough to convince me to sell off the N/A cams I have laying around.