I was wondering which on of these setups would be fastest for my 82 Z-28 as seen in my sig. I tried importing the DD2000 files into digital dragstrip or dragstrip se,something like that. But it would not load the files. I was wondering which one of these would be the fastest and best setup for a fast street car.
Sorry i can't post the actual files my web server is down.
Thanks Leigh

Comp Dual Energy DEH255 Comp Extreme Energy XE256
rpm Torque HP
2000 340 130
2500 346 165
3000 352 201
3500 357 238
4000 354 270
4500 344 294
5000 322 307
5500 293 307
6000 252 288

Comp Extreme Energy XE256
rpm Torque HP
2000 334 127
2500 344 164
3000 350 200
3500 355 237
4000 355 270
4500 350 300
5000 334 318
5500 306 321
6000 269 307

 

I think the 2nd combo will be faster.

 

your motor sounds similar to mine, it's in my sig. Are your heads ported? what intake do you have? aside from your auto trans, your combo is close to mine. I am very happy with my cam, it makes great power to like 6200 rpms and has a wicked idle. The specs are in my sig though the LSA may actually be 110 degrees.

 

Of the two cams, I think the second would be faster also.

Mark

 

Second for sure more horse and torque.

 

I have the Comp Cams XE262 in my 84 Z-28 and it is stronger than both of those. I don't have any trouble with idle, power brakes or anything else like that either.

 

The comp XE262 only makes slightly more horsepower above 4000 rpm but less torque and horsepower below that. I don't think the trade off in torque is worth the very slight gain in HP. Which off these combos would be the quickest, shifting at 5500.

Comp Extreme Energy XE256
rpm Torque HP
2000 334 127
2500 344 164
3000 350 200
3500 355 237
4000 355 270
4500 350 300
5000 334 318
5500 306 321
6000 269 307


Comp Extreme Energy 262
rpm Torque HP
2000 326 124
2500 334 159
3000 343 196
3500 352 234
4000 355 270
4500 350 300
5000 337 321
5500 312 327
6000 279 319

 

ME Leigh,

Well according to those numbers I'd go with the 256. Where did you get that info, and on what application was the cam tested?

That's rather surprising.

 

The data is done by using DD2000 with the following setup specs for my 82 Z-28 LU5 305 cid:
Low Performance/Pocket Porting
1.84 and 1.5 valves
9.5 compression
Dual Plane
600cfm carb
large tube headers and mufflers
Comp XE262H-10.cam
http://www.uidaho.edu/~osie4078/DynoData/mycarDE255.dyn
http://www.uidaho.edu/~osie4078/DynoData/mycarXE256.dyn
http://www.uidaho.edu/~osie4078/DynoData/mycarXE262.dyn

 

I'm pretty sure the XE262 would actually make my a lot slower, and also feel a lot slower.

 

I would have to agree with you, beings you're going to be shifting at 5500. Now if you decide to go the 6000 route then the 262 would be better.

 

Word.

The 256 May be a bit faster than the 262, Im un decided.

But my 262 Pulls 99 Mph in the 1/4 on stock heads and exhuast, so Its no slouch.

Expect that to be close to 101-102 With Good headers.

 

you have to consider traction. moving the torque band up some can be helpfull at times. also, this is a desktop dyno and not a real engine. if your concerned about low end torque that much, use a higher stall converter.

 

ME Leigh,

Can you run the numbers for an XE-268....just out of curiosity?

 

Here are the numbers for the comp XE268

Comp Extreme Energy XE268
rpm Torque HP
2000 308 117
2500 320 152
3000 331 189
3500 343 228
4000 348 265
4500 350 300
5000 343 326
5500 322 337
6000 297 339
6500 263 325
7000 227 303

 

One of the reasons i want a smaller cam is so that i don't have to change the springs right now.

 

Ok i ran these numbers through Dragstrip SE what do you think, first i did it with a 1800 rpm stall converter and then a 2500 rpm. Shifting at 5000 rpm

DEH255
1800 rpm
ET 13.0446
60ft 2.108
mph 105.35
2500 rpm
ET 12.914
60ft 1.986
mph 104.68

XE256
1800 rpm
ET 12.996
60ft 2.119
mph 105.85
2500 rpm
ET 12.8556
60ft 1.987
mph 104.97

XE262
1800 rpm
ET 13.024
60ft 2.140
mph 105.94
2500 rpm
ET 12.8776
60ft 2.005
mph 104.97

XE268
1800 rpm
ET 13.12
60ft 2.12
mph 106.05
2500 rpm
ET 12.9366
60ft 2.035
mph 104.97

 

Now I'd say your program has a problem. Something isn't right about your setup, or you're shifting too early. There's NO WAY a 256 will out perform a 262 or a 268. Heads or compression is killing the larger cam, ACCORDING to that program. By the way if you don't use new springs, comp may not honor the warrentee. I wouldn't put a new cam and lifters in without changing to the correct springs!

 

There is NO WAY that 256 cam will make more power than the 262 cam, especially with 3.73 gears. Real life is different than some computer program. My girlfriends camaro has a 262 cam in a 305 with intake, 3.42 gears, headers, and pretty much everything else bone stock and it runs 98MPH in the 1/4. Thats gotta be decent HP.

 

Here are the specs for the motor setup in DD2000
my 82 Z-28 LU5 305 cid:
Low Performance/Pocket Porting
1.84 and 1.5 valves
9.5 compression
Dual Plane
600cfm carb
large tube headers and mufflers
Comp XE262H-10.cam

The dragstrip numbers came from Dragstrip SE with the following:
For 1800 rpm converter
Drive train:
Turbo 350 3 speed
1800 stall converter
2.35 multiplier
4 % slippage
3.73 rear drive ratio
Car:
3200lb
.38 Cd
Tires:
26.0 diam
8.5 wide high performance street
Launch:
1800 rpm
shifting at 5500rpm

For 2500rpm converter
Drive train:
Turbo 350 3 speed
2500 stall converter
2.30 multiplier
5 % slippage
3.73 rear drive ratio
Car:
3200lb
.38 Cd
Tires:
26.0 diam
8.5 wide high performance street
Launch:
2500 rpm
shifting at 5500rpm

 

ME Leigh,

Can you run the dragstrip program to shifting at 5750? Just out of curiosity.

And I think you're right. For the application you'd have that may be the cam to go with. I don't think that with better heads and so on it will create more power than the larger cams, but it does lead to a very good, often missed point. Bigger cam does NOT always mean more power!

 

Alright here are the numbers with a stall and launch speed of 2500rpm

DEH255
Shifting at 5750 rpm
ET 12.866
60ft 1.986
mph 105.34
Shifting at 6000 rpm
ET 12.832
60ft 1.986
mph 105.54

XE256
Shifting at 5750 rpm
ET 12.79
60ft 1.987
mph 106.43
Shifting at 6000 rpm
ET 12.75
60ft 1.987
mph 106.65

XE262
Shifting at 5750 rpm
ET 12.8045
60ft 2.005
mph 106.71
Shifting at 6000 rpm
ET 12.757
60ft 2.005
mph 106.99
1800 rpm

 

Yeah, I think that a lot of people "over cam" because they think bigger is better, and that a bigger cam has to make bigger power.
As can be seen by all of my DD2000 and Dragstrip SE data, again the XE256 is the fastest.

 

just how much dragstrip data have you logged in your life?

 

and youve got to be crazy to think that your cam/head/exhaust 305 is gonna break into the 12's. i would not trust your computer programs as far as you can throw them. youd be lucky if that combo made high to MAYBE mid 13's with a perfect driver and conditions. maybe a REAL drag racer will agree. im no expert but i do know it takes more than heads and a cam to take a 305 into 12's.

 

Well, at least with as mild of a combo as he is planning, and without a SERIOUS diet.

Springs are 30$, and You need to Change them anyway the stock ones are horrible, and completely worn out by now.

I think You need to stop playing with your little programs and start listening to some people who have been there

 

I know there aere noway i'm gonna break into to the 12's or even the 13's i was just running some numbers to come up with the best combo i could find for the street. All of the tests were done with optimum conditions which i know i could not duplicate or even achieve. I was just hoping to get a good street, torque and horsepower combo that i would have some potential to use in the future with better parts, i.e. heads.

 

ME Leigh,

I think I know what you are getting at. Consider this though...

If you go with a slightly larger cam (which as stated before...you won't have any trouble with idle or power brakes or anything)....and when you decide you want more ponies, you'll already have the right cam in there.

And more power is what you end up wanting!!!

It's entirely up to you. That's the approach I've made though. I've only changed things that I know I will eventually want. I didn't go with cheap headers b/c I'd rather hold out until I get what I want.

And in the few instances I didn't follow that approach, I've regretted it.

Whatever you do, get some springs though. They're not expensive and there's nothing like getting it right the first time.

 

So does everybody think i sould go with an XE262, so i will have room for improvement.

 

I'd plan for the future. The 262 won't hurt you much at all with you current set up...just fractions of a second.

And you'll end up with more power as you continue to upgrade.

I think the 262 is a great cam for a street/strip car. It is very streetable, a lot of people have used it without any trouble, and is aggressive enough to produce so good power.