New cam in my c7 where to start in the tuning process first

[michaelcox5150]

Never tuned for a cam before, 233-243 655 660 118lsa lmr cam, currently have long tubes,off road xpipe, b&b exhaust, v3si blower and alkey meth, i installed dod delete and cam phaser, ls7 lifters, brian tooley pushrods and springs thanks for ur help

[Higgs Boson]

tune it just like you would a CAI or headers or anything else. make sure you tune your SD tables and don't just shortcut it as a MAF only car.

[JnJSpdShop]

tune it just like you would a CAI or headers or anything else. make sure you tune your SD tables and don't just shortcut it as a MAF only car.

Someone else who sees the need to calibrate both airflow models? Great to see

[Ben Charles]

It's pretty much a requirement in the Gen 5...tq reading won't be correct without dialing in the GMVE table

[JnJSpdShop]

It's pretty much a requirement in the Gen 5...tq reading won't be correct without dialing in the GMVE table

Lol well you should tell that to the "tooner" shops that give'em 3-4 rips on the good ole inertia dyno and call it a day. I had a supercharged car at my shop this summer that had all sorts of low speed drive-ability issues from a well known shop.

[Higgs Boson]

Lol well you should tell that to the "tooner" shops that give'em 3-4 rips on the good ole inertia dyno and call it a day. I had a supercharged car at my shop this summer that had all sorts of low speed drive-ability issues from a well known shop.

That has been typical since GenIII days. "Time is money, get it out of here!" For shame.

In fact, it's why I learned to tune in the first place.

[JnJSpdShop]

In fact, it's why I learned to tune in the first place.

Sad but true I have heard that from a ton of people. I even had a guy in my shop wanting to purchase a VCM Suite and rent dyno time here and there to get his car right because he didn't think anyone spent the time to do it correctly.

[eficalibrator]

Soooo.... how well are you guys prepared to map the speed density model? Are you locking the cam at zero and treating it like a GENIV or are you taking multiple layers of GMVE data at various cam angles and using a regression tool (that isn't part of the HPT suite) to solve for the cam angle coefficients?

[schpenxel]

I'd guess the former

[JnJSpdShop]

Soooo.... how well are you guys prepared to map the speed density model? Are you locking the cam at zero and treating it like a GENIV or are you taking multiple layers of GMVE data at various cam angles and using a regression tool (that isn't part of the HPT suite) to solve for the cam angle coefficients?

Speaking of which how much data do you feel is enough? The COMP phase limiter allows 20 of movement so would data at 0,5,10,15,20 be sufficient?

[02statesman]

Soooo.... how well are you guys prepared to map the speed density model? Are you locking the cam at zero and treating it like a GENIV or are you taking multiple layers of GMVE data at various cam angles and using a regression tool (that isn't part of the HPT suite) to solve for the cam angle coefficients?

I do all my tuning on a spreadsheet.

[Higgs Boson]

Soooo.... how well are you guys prepared to map the speed density model? Are you locking the cam at zero and treating it like a GENIV or are you taking multiple layers of GMVE data at various cam angles and using a regression tool (that isn't part of the HPT suite) to solve for the cam angle coefficients?

maybe on a ford it would be more complicated, which is why everyone only tunes the MAF.....

on my personal GM with VVT, the cam angle retards but is the same at any given load/rpm whether WOT or part throttle.....

for example, it is fully advanced with 0 up to, say, 4000 RPM, across the board, then retards to, say, 3 by 7000 RPM.

there is no retard for EGR at part throttle.
the VVT spark tables are zero'd.

the VVE table is tuned and the MAF is tuned and the spark tables are tuned.

my LTFT are disabled, my STFT are -3 to -5% everywhere all the time.

416ci with blower.....runs good. very smooth, no hiccups.

[Redline MS]

Lol well you should tell that to the "tooner" shops that give'em 3-4 rips on the good ole inertia dyno and call it a day. I had a supercharged car at my shop this summer that had all sorts of low speed drive-ability issues from a well known shop.

Thats the $299 street tune special because they most likely trolled around for a file and stuffed it in.......I still think there should be an organization that certifies your a proficient calibration facility and qualified to work on customers $118,000 ZO6's. This would make the customers realize who's on it and who's not. This doesn't mean you need to be a big shop just that you took the steps to be in that group cause you give a crap. Morning rant....

[schpenxel]

Thats the $299 street tune special because they most likely trolled around for a file and stuffed it in.......I still think there should be an organization that certifies your a proficient calibration facility and qualified to work on customers $118,000 ZO6's. This would make the customers realize who's on it and who's not. This doesn't mean you need to be a big shop just that you took the steps to be in that group cause you give a crap. Morning rant....

I tend to agree. I haven't messed with anywhere near the number of cars you have.. and they were still probably 75% tuning hack jobs, at best

[JnJSpdShop]

Thats the $299 street tune special because they most likely trolled around for a file and stuffed it in.......I still think there should be an organization that certifies your a proficient calibration facility and qualified to work on customers $118,000 ZO6's. This would make the customers realize who's on it and who's not. This doesn't mean you need to be a big shop just that you took the steps to be in that group cause you give a crap. Morning rant....

More like the $500-$600 special up here in my part of NY. I always get a kick out of the guys doing SD calibration work with the bargain basement $18k dyno with no holding or load capability. Another good laugh is the wideband systems they are using to calibrate these $100k cars. You need to have the right tools and right equipment to get the job done correctly

[Redline MS]

Soooo.... how well are you guys prepared to map the speed density model? Are you locking the cam at zero and treating it like a GENIV or are you taking multiple layers of GMVE data at various cam angles and using a regression tool (that isn't part of the HPT suite) to solve for the cam angle coefficients?

You so shady! LOL!...... make the tool and the get it out already....oh yeah.....marketing works slow over there!

[schpenxel]

Don't forget the guy that is trying to do an SD tune and doesn't even have the wideband connected to HPT and are trying to just use the dyno wideband reading...

[wetcoast]

Soooo.... how well are you guys prepared to map the speed density model? Are you locking the cam at zero and treating it like a GENIV or are you taking multiple layers of GMVE data at various cam angles and using a regression tool (that isn't part of the HPT suite) to solve for the cam angle coefficients?

I went back to the first posts and have been browsing every page up to here looking for the answer to this ^

[mbray01]

Do I have all the fancy tools Im sure you do? No. However, When dealing with cam position, I have found it best to start with known good cam position vs rpm. Dial in ve with cam locked to these positions. Now I will move the cam a little to see if there is improvement or not, and if I need to move the cam differently, I will dial the ve in again. This has served me very well. Is the the best way to do it, or the proper way to do it, probably not, but it does give me good, repeatable results. When dealing with large aftermarket cams, we are not really moving them that much, so there tends to be less trial and error vs tuning the stock cams. IF the cam is known to be in this position at this time, under all circumstances, then we can tune it as a 3d ve table. Now if we want egr, dod and other things to still operate, then that is where the 5d model comes in. And having to map for all variables. Now if a customer comes in, and wants it all to operate, I would be glad to do so, however I am pretty sure 999,999 out of 1,000,000 will say never mind when they realize the cost of the man hours involved in actually mapping all of that with an aftermarket cam. Its not that correctly mapping these can't be done, its that the vast majority of customers are not willing to pay for that!!!!!!!

[rjw]

Thats the $299 street tune special because they most likely trolled around for a file and stuffed it in.......I still think there should be an organization that certifies your a proficient calibration facility and qualified to work on customers $118,000 ZO6's. This would make the customers realize who's on it and who's not. This doesn't mean you need to be a big shop just that you took the steps to be in that group cause you give a crap. Morning rant....

I'm not in the business, but while I agree with you that some kind of certification would better serve customers, it would not eliminate possible attitude problem... i.e. a shop or tuner who would profit from the cert, yet still put out snerf tunes.

I hear where you're coming from, in that there seem to be a ton of under qualified people preying on the uninformed.

I wish you the best in keeping ahead of the whack pack, in that you seem to love this stuff and passion is part of what is needed.

steps down from 6" pedestal...