Turbo cams....worth it?

ive done some research and this seems like a fairly easy, cheap mod. are there any negative side effects to doing this?? and will the car idle rough? as well what are some noticable upsides to this mod. any feedback appreciated

Ive always heard that turbo cams werent as agressive as non turbo cams.I would do some more research on it or i could have gotten the wrong info.

Wrong info it is. The turbo cams are more agressive. Or should I say cam. The intake cam is more agressive on the turbo 1G. Just as long as it's from a 91-94 Turbo 5-speed.

Tim,so is what your saying is that putting in a turbo intake cam would be beneficial?? and if so would my car idle rough,and cause more disadvantages

Sit in a turbo car. That's what it feels like generally. It pulls harder. Why do you think better cams have higher lifts and longer durations?

Hi Tim. If I understand correctly you wish to install turbo cams on a non turbo, this would make your car slower. Even if the lift and duration profile is more aggressive the lobe seperation between intake and exhaust will be greater than your non-turbo cams. Forced induction cams narrow the lobe seperate so the forced induction does not blow through the exhaust instead of filling the cylinder. Whereas on NA the exhaust creates a vacuum to suck in the intake charge.

It is like the difference between Vtec and non-Vtec on a Honda. Non-Vtec power band is torque but can not rev-fast or at high rpms (if you manually disconnect the solenoid), the Vtec however can rev high. Sorry about the Honda analogy.

You might want to confirm the lobe seperate before you do this mod, or get cam gears and hope you can narrow the seperation.

IM

I havent heard of any idling problems, but every car is different. The cams definetly will make a difference.

Check out NT.DSM.ORG for some good Turbo cam info.

?

There is nothing much there..

Am I missing something or some page? All I see is a few ppl asking how TSi cams will run, but lacks any sort of feedback from people that have them installed.

Chris, you have TSi cams in your ride? you want to share your experience with it?

No I dont have them, but a guy on NT.DSM.ORG says they pull way better in the top end, where as the n/t cams drop off at about 6000rpm, my power even drops off a tad earlier.

Not to step on any toes, and I may be way off base here, but traditionally...

N/A Cams in reasonbly high performing engines ended up with additional overlap and longer durations than there turbo brethren. In fact, in the Toyota world you could pick up a number of ponies by switching Turbo cams for N/A cams in the turbo cars. Unfortunatly the overlap created blow-by and a loss of low end torque, but top-end performance increased significantly.

And conversely, i've personally watched an N/A Celica make a dyno run with Turbo cams and pick up 3-4ft pounds of torque in the bottom end, but lose more than 10hp by 5,000rpm.

What portion of the turbo cams are more agressive? More lift? Duration?

Paul

I was thinking the same thing too.

N/T cams have overlap to encourage scarvenging...it allows the engine to breath better.

I dont think by just changing cams you are going to get more power..you are just moving the power band up higher. And how would the ECU know what cams you installed and "fix" itself?

I've had 93 turbo 5-spd cams for about 5 months, and they do add power. My engine used to die after 6000, now it pulls to 6500rpm.
I recomened it, UDP is also a good mod for the money.

So, do n/t cams help turbo cars?? maybe gives lower end torque?

No. This is regarding turbo cams in a n/t engine, not visa versa.

Look at the profile of a n/t cam. It is the same as a 90 turbo cam. The 91-94 cams are more agressive in terms of lobe height.

OK, if the 90 turbo cam is the same as a n/t cam...
If I swap out my 90 turbo cams for 91-94 NT cams is that any different?

Yes

Ok remember I pm'ed you about this Tim, here is where I heard it I know you say its not, but this is what led me to believe it.

1g NT cams and gears
These have a lift of 256 as opposed to stock turbo cams of 248.
Half way to 264 cams for a fraction of the price
Great Cheap Upgrade with noticible results
$50 for the pair

I haven't "dug into" the various stock cams much, but you need to know lift, and duration to decide what you want.

You've listed duration (not lift), but do you know what the lift is? If it's lower, the longer duration might not do you any good. (Or, could be worse).

Also, is that for the intake cam, exhaust cam, or both?

I am not sure as I found this in the for sale fourm, and I have a set of n/t cam. I have looked with no luck.

Haynes manual has the specs on the cams. They miced them out and posted their sizes. My book in burried in a pile of junk and I'm not going to look but I'm positive that guy is wrong.

The Haynes manual just tells you lob height.90 -92 are the same for turbo and n/t but that doesnt mean lift duration or even overlap are the same.

Here's the specs on the Brian crower site. It lists stock turbo and non specs.

http://www.briancrower.com/makes/mitsubishi/4g63.shtml

Nice Link.

I remember seeing that NT Intake cams were 256 years ago but I didn't remember where.

It also seems that the NT exhaust cam has a slightly more aggressive duration as compared to the turbo exhaust cam.

1752? That's an old cam!

The Brian Crower listings actually show the N/T cams as equal or better in all but one very minor spot.

Now, contrary to that, I put 92 Turbo "C" and "D" grind cams in my Galant N/T 4g63 and it had a noticable power increase from around 3200 rpm and pulled to 6000 rpm now. Previously with stock cams it wold work from about 3000 and fall on its face at 5000.

There is MUCH more to cams than lift an duration. Changing your cam profiles moves your power band around more than adds/subtracts power. When modifying your cams think more about where on the powerband you want to make the power. Keep in mind that it's easier to make power at higher RPMs.

Here is some info on what camshafts do for your motor and what effect changing them will have on your overall performance. It's for the 4AG but the rules apply to all of us.

http://www.club4ag.com/faq_and_tech_pages/4A-GE%20camshaft_story.htm

Wow, way to bring back a thread that's 2 years old.