what gears are in it?
what gear was the pull done in ?

 

Factory 4.10's, 3rd gear pull.
Did warn me that the driveshaft might let go, but I didn't see why that would be a problem??? Either way, it didn't let go. I didn't want to give up any low end on this cam, and honestly its the smallest cam I've ever put in an engine that I was trying to make power with.

I usually build camaro/mustang/under 3500lb combinations- I'm used to a driveline loss of 14-18% typically. Since it was brought up, and I hadn't thought too much about it, just how bad is the 4L80E?

I do plan on getting a multi-disc lockup from Precision Industries with a higher stall than stock, but im sure that won't pick up much power.

The thing is, I have built other 6.0's with similar parts that made 540-570hp on the engine dyno, (with cams that had about 10-12 degrees more on it than this one does) so I honestly expected to see close to a 400rwhp+ number out of the gate.... But those aren't 100K mile motors either- If I had to chalk it up to anything, I'd think the rings just aren't what they used to be, OR that damn trans sure does suck up alot of power- That, and those 32" tires.

I guess at the end of the day, im under 4 grand into it, and it sure is alot more fun to drive than it was.

 

+100 rwhp is still a good bump

 

Just wanted to point out that there is no reason for that cam to be peaking at that RPM, that cam should be making power higher then that. Something is holding it back, that is not a low end cam and it should easily pull to 6400. Food for thought.

 

The 80e probably isnt hurting the numbers much, but the 32's and the 11.5 rear in addition to the 80e is where your losing rwhp. This combo in a RCSB would be real close to 400 wheel. Who speced the cam? Good job on the documentation.

 

I spec'd it to go with the heads. Funny thing is, heads move 320cfm @ .650 and the cam lifts to .615 (decently agressive) and I also thought it was VERY odd that it just cruises off peak after 5,500. I expected peak power 1,000 higher to be honest. There very well might be an electronic issue.

Tuner did say something about the maf not showing the usual "count" or something like that-
Said "usually around 99 or 98, and yours hung around 90/91"
I'll ask him monday what it was he was talking about.

Funny thing is, I tested my battery at O'reilly yesterday and it was junked. Warrantied it out for free, but I don't think that had anything to do with it. Who knows.

 

What AFR was it tuned at and any idea what kind of timing you are seeing at WO?

There is no doubt that a 80E and heavy rear dont help numbers, I feel your pain as I have a 80E and Dana 60. I however like the strength.

 

Dyno sheet posted above. Tuner's printer apparently blows, but its not like I keep these things anyway.

A/F is 12.7 according to the sheet. I wrote the RPM under the graph- the top in blue is the run after tuning, the green one thats all crazy was before he tuned it (why you'd even bother to print that, I have no idea) but there it is.

 

AFR looks fine, any chance he was refering to MAP KPA and not MAF. That doesnt sound like a MAF number but could be MAP KPA. If so then you have a inlet restriction.

 

MAP sensor was reading 93 KPA @ WOT (just called me) so maybe that stock airbox is a bad idea?

Said it was dropping from 99 down to 93 above 4,000 rpm.

Ideas?