Hard to believe there is anything in Nebraska at 7,000-ft. This source shows elevation at 1,220-ft.

http://www.city-data.com/city/Ceresco-Nebraska.html

 

That does sound kind of wrong after thinking about it. Google Earth let me down.

 

lincon airport is at 1200ft AGL....may be out west by wyoming it 7k AGL, certainly not here...

Question: Would it hurt to run the thing on 87oct since the DCR is at 7.8???

 

As long as you have an operative knock sensor then you'll be fine. Even at your alt. I doubt 93 would benefit you any more than 91.
Take care of unclogging that air pump of yours.

 

the KS works just fine...did so last dyno session. At least i could save a bit at the pump to help save up for new heads/cam....

 

If it was me I wouldn't save up for new heads and give up on what you have but I would tweek the current combo a little first...

If you have that am installed straight up and have an adjustable timing set then I would try advancing the cam 2-4* this will bring your DCR up into a better range and you can then go and redyno to see where that put you...

The next thing I would then try would be having the heads milled and ports looked at. I just did this with the heads I got from my buddies old setup and it didn't cost too much. If you get them angle milled .04 you should drop the chambers to about 65 cc's, and install it with a set of custom gaskets in the .042 -.045 range for good quench, and test it again. Between those tweeks your motor would be a whole different animal and more then likely pick up those missing ponies. However, make sure you check the math if you both advance the cam and mill the heads to put it where you want the motor to be, I would guess if both are done then 65cc heads on your motor with that cam would like 2* advance...

Again this would be a cheaper way to get more out of what you have without starting over, and this is what I would do if I was in you situation...

 

I'd aim for something closer to 0.030"-0.039" for quench.

 

I think the problem is in the tune. Who did the tuning??????

I haven't read the entire thread. With that said, I don't think the combination of parts are the proximate cause of the low numbers per se. In my experience, I had an LT4 383 that made 370 horse and torque with a mail order M.T.I. tune. After I purchased LT1 edit, I had a person who has never tuned a car try and pull additional power out of the car by adding timing and leaning it out. The person could not come close to 370 hp after an hour or so of dyno tuning and we put the mail order tune back in.

The LT1's from what I understand are difficult to tune, and one must be familiar with the changes of many setting when changing one parameter.

EDIT: My old combo...AFR 195 race readies; comp 503 cam, A4 with stock stall and 3.42's, non-ported LT4 intake; 58mm TB; mid length 1 3/4 headers with no cat and magnaflow muffler, rest of exhaust was stock including tips. 10.1 to compression; mail order tune from MTI.

 

i'm going to get a second opinion, there is another dyno shop in lincoln. the guy i went to is a good guy, but dosen't strilke me as the smartest guy around. This last time i was there his software for logging was screwed up from letting another guy do some tuning... I'm not expecting much more power...but we will see...

 

7k AGl?? Is this 396 in an airplane?? J/k I thought it was funny.

 

yeah thats really strange...you have almost the exact setup as me, except I have a 23X 23X .6XX 113 LSA cam. My car made 455 rwhp 409 rwtq on a Mustang Dyno. I'd get a second opinion definitely.

 

What's your static CR out of curiosity?

 

I strongly suspected the problem is in the tune, and with what you have written, I am now convinced of it. Send your computer to a person who has a background in tuning LT1's. Jeff Creech, of Carolina Auto Masters and Ed Wright, of Fastchips are about the most experienced LT1 tuners that I know of.

 

could be the dyno. what was your baseline?

 

static cr is 10.5 and DCR is 7.8....which is low...oh well....
on a mustang dyno in omaha i pulled 323hp/337tq at he wheels, but that guy is out of business now. orginially pcmforless did the tune, i gained 20hp/tq on that tune dynoing in omaha. then i took the car to the this place in lincoln and those are the same numbers i keep pulling. the guy says everythign is spot on...