That car had a cat on it so its about 1 point richer then the plot shows.

No we did 20+ cars that weekend so we did not have time to check anything out. The car tuned totally fine at and made the power it should for the mods done.

We had 2 cars this way both took the extra 5-8deg timing before we got knock and to make the hp for the mods done.

I would like to check them out closer when we have time.

So in recap the cars made the power they should and seemed just as safe as the rest just needed more timing to make the hp. I think its either a backward cam sensor or some how the # we are seeing in the rom are not the real #.

 

The cam sensor only goes in one way, I think you mean the actual metal part on the end of the ex cam the sensor picks up right?

Did either of these cars ever have a piggyback installed?

 

Mine did not have a piggy back, and mine doesn't have a cat either FYI... Helix TP, but it does have the Apexi exhaust that necks down in a few spots...

 

The dyno cell doesnt have the best airflow either, most of the cars would show 12.0 on the dyno and then 11-11.5 on the street. Like Lucas said, this one also had a WB (that read correctly in car +/-) and this was a tailpipe sniffer wideband on this particular dynojet.

 

Sounds like a great place to tune a car, lol.

 

LOL...you know what I mean...errr the feedback from our customers after the dyno session was the cars were still within check as far as AFRs on their return trips home

 

So these are the only 2 cars in the world that do this? No one else has run into this yet? We will have Freddie's car in the shop on the 7th to doublecheck idle timing but the car idles smooth with "normal" timing in the map.

 

Update to this--

Freddie brought his car in this morning to have some Comp 272's thrown in and we discovered the following. Much as I remembered the car idles with proper timing at the mapped value 7-10*. Pulling the cams out and checking the orientation of the CAS it is installed correctly much as you would expect from a car that never had cams in it.

This car is definitely one of a kind as far as I can tell. I will post up a shot of the map after the retune to show what the AFR's, Ignition, and all other "little" things that we do to extract control and make power.

I guess congratulations is in order? But Freddie has a mutant and we dont know why but it is was it is.

I guess the question is now that we know this is a factory set up has anyone seen any variance in compression or combustion chamber size that would account for this?

aaron

 

UPDATE V 1.2...

After English Racing installed the Comp 272's timing and fuel maps were back to where they should be... so looks like I had some weird factory cams... We compared the keying with another set and they looked identical so the only theory we could come up with is that the stock cams were either ground weird, or were cast weird... Aaron correct me if I am wrong on any of this... I am still at a loss... I guess the only true way to find out would be to compare my stock VIII cams to another set of stock VIII cams on a rolling micrometer to verify lift/duration variences...

 

Freddie nailed it on the head. I honestly think I understand why the sea of 8's happened. I bet there was a run, maybe randomly distributed through out the years, of mis machined cams. Comparing them to a set of stock cams at a facility like Delta Cams in Tacoma (cam grinder) would be the way to go. I will snag a stock set from Billy and bring them to the D.