Turbo cams in a NT, good or bad? - DSM Forums: Mitsubishi Eclipse, Plymouth Laser, and Eagle Talon Forum: DSMtalk.com

Dan4g63 · 02-12-2003, 08:32 PM

Is there a point from putting 1g turbo cams into an 1g NT? I know its been discussed in the nt forum but there is no indepth detail.

A guy i know says it will decrease power here is his argument.
"Why would putting a turbo cam into a non-turbo car do anything but decrease performance. With a turbo cam as I mentioned before, there is not much overlap. When you are up in the revs, you want alot of overlap. This is the whole theory of variable walve timing. When you are high up in the RPMs it switches the cam profile to one with a high overlap, because if you had just a high overlap at idle it would cause your car to run rough, like most of the old muscle cars do at idle. Limited overlap at high RPMs will rob power, and make you run rough up top. A turbo car usually has exhaust manifold pressure higher then intake boost pressure. If you have these characteristics, and a long duration, high-overlap cam (Such as seen in an NA car) a huge amount of reversion will be created. This is why turbo cams would be the opposite."

While i agree with most of the stuff i still think swaping the intake cam from a turbo onto a nt will benefit you. So whos wrong here?

TEC · 02-13-2003, 11:34 AM

All that theory is great but heres the truth of the matter. I've installed both stock and Crower 64413 Stage 2 cams on three 1g NT's so far. All of them have gained power. The stock cams (and I do mean both intake and exhaust) made a difference over the entire RPM band. The Crower cams lost some intial HP on the bottom end but picked up a load on the top end. So there goes that theory out of the window....

Oh, if theres any doubt please feel free to ask around at the SE.DSM.org site.

NOMIEZVR4 · 02-13-2003, 11:45 AM

ya, member supergoat will tell ya more

Dan4g63 · 02-13-2003, 02:19 PM

does anyone know where i could find any dyno plots or anything?

supergoat · 02-17-2003, 05:42 PM

No dyno plots here.....yet.

But I have installed stock turbo cams and can tell you that they definitly add power. It's a nice gain throughout the whole power band. Low end increased nicely, which was good since my header and exhaust killed my low end power. 4-5500rpm screams and 6000+ actually has power instead of dying off like with the stock NT cams.

However I'll be upgrading soon to some HKS cams.

Check my website for my full review on the turbo cams. http://www.eagletalonnt.com

So yea, don't believe your friends theory, believe those of us that have actually done it.

Blackboost · 02-20-2003, 07:31 AM

Moved to NT Tech...

Ozzmosis · 02-20-2003, 10:48 AM

I have a question about installing the cams. Forgive my stupidity but I know nothing about timing and I have never installed cams before. Is it possible to do this without removing the timing belt? I read in another post that supergoat did it this way but I am not sure what he actually did.

ka24denos · 02-20-2003, 01:05 PM

No! thats not possible!

supergoat · 02-20-2003, 01:33 PM

Quote:

Originally posted by ka24denos
No! thats not possible!

Yes, it is.

But it requires you being very careful. If you mess up then you have to do a timing belt job. So don't do it the "quick" way unless you can either a) do a timing belt job or b) can afford the downtime to have the dealer do it for you.

Basically you jam a piece of metal between the cam gears to keep tension on them. Unbolt one cam gear, slide it off(slowly while keeping the timing belt on it.) and swap the cam. Re-install the cam gear and repeat for the other cam.

Sound like a not so safe way? It's not. But it works if you are careful. I will add that I messed up when doing my exhaust cam. I removed the metal wedged between the gears too soon and my timing belt slipped. I forgot to tap the cam gear back on the cam all the way before I removed it.

But I got the intake cam done perfectly.

Also, I had the intake cam swapped and everything buttoned down in 20min before tackling the exhaust cam.

Ozzmosis · 02-20-2003, 02:54 PM

That's what I thought you did. I guess I'll just have to decide if I want to take that risk once I get to that point. Has anyone else done it this way?

Lex_Dog · 02-20-2003, 08:26 PM

should you replace both intake and exhuast cams?? has anyone experimented with just the intake or vica versa?? supergoat.. when you runnin it on the dyno?? im plannin on doing this to my eclipse and since im rebuilding the motor i plan on experimenting with everything and drawing some really good NA power out of the motor..

redawdturbo · 02-20-2003, 08:46 PM

Check this out for installing cams http://www.roadraceengineering.com/i...structions.htm

SpoolingWOT · 02-21-2003, 02:45 AM

I used zip ties to secure the cam gears to the timing belt, pulled them off AT THE SAME TIME, dropped in HKS cams, popped the gears back on, bolted everything down. Wait 30 min or so, start car - and wow!!!

I just happen to have a set of 98 GST cams lying around my shop bench, with only 58k on them.............

MegaGS · 02-21-2003, 09:02 AM

Quote:

Originally posted by Dan4g63

While i agree with most of the stuff i still think swaping the intake cam from a turbo onto a nt will benefit you. So whos wrong here?

Here's a thought. Why do us 90-94 nt guys have the same intake cam as you do? Sucking more air in will add more power.

Lex_Dog · 02-21-2003, 01:46 PM

ok let me see if i can sum this up... us 90-94 NT guys have the same intake cams as the 90-94Turbo cams.. and the only thing that is different is the exhaust cams?? let me know if i am wrong.. but if i am right then why wouldn't we just replace the exhaust cams to save money?!