Edubs

Mev and I spoke about what possible issues there could be with the manufacturing and grinding of the cams. He mentioned three things. Let's see if I can remember...

#1 - Material Grade/Hardness
#2 - Centerline
#3 - Material defects/damaged cams

He mentioned that Geoff at Colt tests all three aspects of the cams before they ship out. I was concerned about this also. I am currently trying to touch base with those that ordered their cams ground off of Steel Billet Cores. Those sets of cams should have the stock centerline and not be adjusted due to the regrind on stock cams. I have yet to find out if any of those people have received their billets and installed them. We will see what we find out in the upcoming week. I have quite a few PM's out there waiting for response. Like I said before, I don't want to point fingers until I have proof of what the real causes are for my vehicle not running...

I'm curious. Are you running that setup currently? Who did you have grind the custom cams? Did you dyno your setup?

cavy-to-SS

damn yall still having problems with these cams....return them back to jbp and keep stock....STOCK CAMS FOR LIFE...thats my new motto..but either way i hope yall get the cars running soon...esp. you dan

NGalaxyTimmyo

iTrader: (1)

I ordered new cams, so if and when I get them, I'll let you know. JBP called me about a week ago asking if I wanted steel, or the GM cores.

Edubs

So what did you pick? GM Cores or Steel Billet?

Witt

Same person that made riceeater's cams on the redline forums. I'm still waiting on parts to finish the build so I'll update when its done. They are base circle regrinds but the lash adjusters are shimmed to maintain the stock height. Riceeater has a video over there of the same cam I bought but with a 280 grind.Stock cams will only flow a limited amount of air. Limited air = limited horsepower.

DTM2188

Also interested in your outcome, Witt. It seems like with each passing day, there is more and more info that gets passed along with what the problem may be, just no answers unfortuantly. Oh and Steve, thanks for the "esp. you dan" hahahaha, you just want someone to cruise with again lol.

Witt

What I'm interested in seeing is the results of the cars with the steel billets. I'm pretty sure I know the lash adjuster's maximum travel and also stock height, but I can't find the source where I originally learned it so I won't quote it until I can find a credible source. I really think shims are going to ultimately be the answer imho but this is a guess since I haven't actually seen these cams in person, I'm just going by what I can remember of the maximum amount of lash the stock valve train can take up and what JBP posted about removing .100" of material from the base circle.

cavy-to-SS

haha you just havent had your car in what like 2 months...damn i wouldnt even know i owned a cobalt after all this

Edubs

JBP posted about having 0.025" more lift than the original camshaft. Where the .100" came from was that the stock LSJ lifter can accomodate lash up to .090"-.100"...

chevysalesman614

mine is finally running good.. I'll cruise

Witt

Is .025" the amount of increased valve lift or the amount of cam lift?

The .100" is pretty much the limit on the stock lash adjusters, I agree with as well. The first time I read that post, I took it to mean they actually removed .100" of material.

Edubs

Increased valve lift is .025" as I understand it...

Edubs

Okay here's where we stand. Before I brought the car in for the cam install, I had a CEL with the DTC:

P0171 Fuel Trim System Lean -PCM

I made the assumption, based off of research I had done before installing my intake that the code had to do with a dirty MAF(Note: DTC occured after intake install), or more likely, the increased flow extending readings past the frequency available in the tables.

Well I just read the codes that this is what I came up w/:

P0172 Fuel Trim System Rich –PCM
P1182 Supercharger Inlet Pressure Sensor Performance -PCM

I went from Lean to Rich and now I have a sensor gone bad aparently. What confuses me is the obvious mechanical noises displayed by my non-functioning engine. I don't think changing a sensor would solve this issue, but it definately is a symtom. We'll see what Matt @ TTP and Mev @ JBP have to say tomorrow. I still have to take the valve cover off to inspect for valvetrain damage, but we definately are getting somewhere. Opinions are welcome...

Witt

171 means your MAF is calibrated 20% or more too lean. (not actually lean but 20% more air is flowing by it then it thinks). then the MAF calibration went an actual 40% in the other direction and threw the 172 code which is extremely odd. The bad SCIP could cause this, but I don't think both codes would be thrown. You could have a bad scip or maf really. Do you have HPTuners? I would unplug the scip and then monitor your fuel trims to see if they come back in the positive range. SCIP is only there to run checks to ensure the electronic throttle and MAF/MAP/TPS1&2 are working correctly.

Edubs

Sounds very...uh...smartish tuning wise? lol

I went to Autozone today and rented a OBD II scan tool to read the DTC's. I love the idea of tuning, but never spent the money on HPT because I know I would do more harm than good with it. I've seen a lot of people blow their engines on here by trying to tune themselves. That's why I was going down to TTP in Jersey to have it dyno tuned. Safe measures, you know?

Basically, what you're saying is that the Inlet pressure sensor on the M62 is there to monitor several functions. By using HPT I could check the values on the fuel tables to see if they're running within proper paramaters?

Witt

Yeah, that is a stumper. I mean my understanding is the SCIP shouldn't influence air metering, but I would definetly unplug it for the hell of it and find some way to check trims after they relearned. All my logs and dickin around with hpt tells me it shouldn't change but to have the trim system go 40% in the other direction, it would almost have to. I dunno. Sounds like a 6 pack tuning session to me tho.

Edubs

I'd buy you a case if you drove up from pitt, lol...

I guess I'll have to see what everyone else says...

DTM2188

Erik, if you could do me a favor when talking to Mev tomorrow. Could you ask him to kindly respond to my 2 e-mails (one is for the refund on the stock cores and the other is about my car problems), its been over 2 days now since sent. I also got your message and saw your post there. Thanks again for the update. As for me, no updates as of yet, should know more tomorrow hopefully, I'll keep you and everyone else posted.

1gmfanatik

Hopefully there will be some good news coming around soon for everyone. Otherwise...JBP is gonna have themselves ALOT of bad news for refunds and what-not.

Edubs

Mev said he responded to your e-mail this morning. That is all...

CobaltSS422

Now all u guys who have the cams installed already still have the stock or GM Stage 2 tune correct? So the car runs rich already to begin with and with the cams it runs a little richer. Now I have the Intense Stage 5 tune in my car and possibly was looking into getting the GM Stage 3 computer. But if i keep the Intense Stage 5 PCM in it doesn't run as rich as the GM Stage 2 computer I know i could still possibly run into tuning problems as well but maybe not as bad because the car doesn't run as rich as a car with the GM Stage 2 tune. I would obviously still get it tuned but i'm just trying to think and add to what could have gone wrong. I'm no expert though

Toronto SS

Shouldnt a cam lean the car out?

1gmfanatik

No..Cams are actually supposed to richen her up. At least that's what I have been told from our local Speed shop guru..lol

spaz

DONT GET THE STAGE 3 PCM. it isn't tuneable it won't work with 60# injectors and everything it can do hp tuners can do better. plus you'll loose ac with stage 3.

g5mike

the cams have richened my car bigtime