Looking for some feedback/info on cams...

[CajunKenny]

When posting your reply, consider me a newb so I will be able to wrap my brain around your info.

I'm considering these options:

1. Stock 7MGTE cams with Adjustable Cam Gears.
- Is there any power to be had here...Is it worth doing this?

2. BC 264's or 272's?
- Are these drop in...do they require Adjustable Cam Gears along with springs and retainers?
- Are there gains with either of these cams by themselves?

My goal is to pick up some low/mid to mid range power.

This read is what prompted this by the way...
http://www.supraforums.com/forum/showthread.php?t=411951

Thanks!

 

[87M-GTE]

Adjustable cam gears will not yield you any hp gain, it is only useful for fine tuning.
So, potentially it 'could' give you an advantage over stockers, but only if you're gonna use that adjustibilty.

BC 264 are a direct drop in camshaft.
The 272's however, required upgraded the springs and retainers, again, you don't need to go out and buy adj. cam gears.

In stock form, I have seen these cams out perform stockers with a more agressive power band to redline, and beyond when tuned.
It all depends how crazy you want to go with the tuning. If you're just going to put the 264s in and call it a day, you will still see a noticable difference, not as much as if it were tuned though.

Sam

 

[CajunKenny]

Thanks for the reply Sam.

What will stock cams with adjustable cam gears give you...just the ability to shift the power band a bit? Or are the stock cams just not going to yield much even when tuned?

Good info on the BC's. I'm interested in toying with cam tuning; but, not in the aggressive manner that the 272's will seem to require. Not to mention the added cost of springs and retainers...

So far, it sounds like 264's are what I'm looking for. Nothing real aggressive; but, will have a bit more adjustability over stock.

 

[92nsx]

The 272's however, required upgraded the springs and retainers, again, you don't need to go out and buy adj. cam gears.

Sam, Where you getting your info from???

I happen to be running BC's 272's and if you want to time them in according to their cam card you have to run an adjustable cam gear.

As for there performance, Steve and I are running the same engine / turbo set up with the only difference being Steve is standalone and tuned, where I am just oem TCCS, with head work and the 272's.

Out come on the dyno was pretty surprising to say the least. We both made the RWHP 417.41!!! Our pulls were right after each other, same day, same conditions, ect.

Only I made the power on 15 lbs of boost and Steve was at 18 lbs. Again I have no sort of tune. And when we shut down the pulls at 6500 rpms (due to running out of fuel pump) the power was still claiming where Steve fell off around 62-6300 rpms. There is a thread Steve made about our dyno day.


Now as for the gears, Im using BBC springs, with cam gears adjusted in according to the cam card.

EDIT: need to add some pics

Intake

Exhaust

 

[CajunKenny]

Rob, somehow I missed that you and Steve are running 272's. You're running BBC Springs, do you know what Steve is running? Stock springs and retainers?

 

[Nick M]

This is the best page I have seen in regards to heads and cams. Although the main jist of his page is actually head flow, he does go into what he got with cams and timing. Just in case you haven't seen this particular page.

http://mk3ukr-supra.net/cylinder_head_main.htm

 

[Poodles]

Cams aren't going to increase low to mid range, the exact opposite in fact...

 

[CajunKenny]

That's a good read Nick. Thanks!

Poodles: The writer of the link Nick provided stated that same thing about mid range loss; but, looking at his power graph, it appears that he gained power at nearly the same point in the rpm range. It's almost contradictory to his writings...?

At any rate, I would be happy with the gains he experienced by tuning the stock cams.

 

[toyotanos]

lol me with 272's...that would be some fun action!
No, I am running stock cams with the same valve springs as Rob. (BBC inners)

 

[IJ.]

Usually by the time you do some good cams you're using a big Turbo that can take advantage of the longer duration cams so you can get some massive midrange gains, it's all about the combination guys my 7M made insane hp/tq around 3000>4000 rpm.

 

[87M-GTE]

Cams aren't going to increase low to mid range, the exact opposite in fact...

In some cases, yes, some not.

It is all in how they are tuned and which cam is used.
By tuning stock cams or 264s I'm sure you could pick up low and mid range hp, at the same time you could tune it to optimise high to mid range hp. If you're going with 272s or bigger, it would be more difficult to see a low and mid range hp gain,it would most likely ruin the low range of the car, but the top end will be greately expanded.

264s are a great cam to go with especially over stock, and especially if you're not going with a huge turbo and shooting for crazy numbers.

Sam

 

[CajunKenny]

Right now, the car is ~390 whp. I don't ever see the car exceeding 500 whp. Mid 400's maybe...

I'm running the JT62 Turbo. Currently, peak TQ is at ~4700rpm.

 

[87M-GTE]

You gotta update your sig Kenny!

Sam

 

[CajunKenny]

I will once she hits the dyno again. Which is soon!

Off topic here; but, are you doing any 2-Piece Driveshafts? I like to exceed the speed rating of 1-Piecer's.

 

[Nick M]

I don't ever see the car exceeding....

Famous last words.

 

[CajunKenny]

True dat!!!! :biglaugh:

 

[87M-GTE]

Shaftmasters makes one, I am running their 1-piece aluminum DS

Sam

 

[CajunKenny]

Dyno day is scheduled for Oct 16th. We'll see what tuning the stock cams gets me.

Thanks for all the input guys!

 

[suprarich]

264 and 272 are not a measurement of a cams "size" It is only the "advertised" duration. 264 and 272 are only two of many many different cam grind durations available. My 274 7.7mm lift cams are tiny compared to some of my 256 duration 12.3mm lift cams. So many other numbers make up a cams profile. Saying 264 and 272 is like saying 60 trim is bigger and better than a 57 trim,,,, without even considering the size of each turbo.

 

[CajunKenny]

^Thanks for posting that info!


My main goal for this dyno session is to get the most out of the stock cams. In post #6, Nick posted a link to some great data. The person in the link gained around 12 hp/27 tq by tuning the stock cams on a stock setup.

I would think that because my has more upgrades than he did at the time of his pulls, that I should yield a little better results than he did. But, if not....I'd be happy with the gains he experienced!