NufNuffZ28

iTrader: (13)

Well, 1st background on the car. Mods and dyno #'s before the cam as follows

1999 SS M6 with 4:10 gears and 315 rear tires and 115k miles on it.

Lid with K&N
home ported TB
LS6 intake
ASP pulley
!EGR
!AIR
SLP long tubes with random tech cats(pretty much hollow)
Borla catback with open plate
hardened pushrods
~with the above I made 346/360


add

F13
PRC dual springs
ported oil pump
Comp cams timing chain


New dyno numbers CORRECTED are 362/360


total timing was 26 and A/F was OK, but not too far off(ie high 13's)


So far I have deleted all codes, raised the rev limiter, and adjusted the fuel some to get a good a/f ratio.

Aborted runs as knew tuning wouldn't get me too much more and that something else may be amiss.

Cam off a tooth is pretty much out of the question as we turned it over several times and checked it. Also peaks were at the right spot(HP around 6100) Torque peaked around 5k, and charts weren't rough or anything either.

Also replaced in the last 3k were fuel filter, plugs, and wires.

Car runs smooth(as much as a cam car can) so I wouldn't think a plug or something was dropped on reinstall, but wouldnt a misfire or ignition show up as a choppy graph?

Is there ANYONE local(im in Durham) that can help me get my tune on some without charging an arm and a leg? I'm happy to pay some though!!!

Chris

jerflash

the timing seems low but not low
my numbers are 400hp/392tq with your ame exact setup but i did it through a stock 10 bolt and 3.42s
do you have a 12 bolt or a 9"?

other then my little better 02 heads and no cats mines the same

NufNuffZ28

iTrader: (13)

Mine is just a 10 bolt with 4:10's...........did you ever dyno with bolt ons to see the difference?


Nice numbers man!!!

oange ss

iTrader: (50)

you might could stand a little more timing and there will be a slight loss from the 4.10

jerflash

with just a lid and catback i did 331hp/334tq corrected

that was the original morot ls6 block but that blew up from a bad lifter so now its a forged motor with less compresion and heavier then stock because i still untouched stock heads. if it was still the original motor i would have expected a lil more with the cam like 410

with the 4.10s in the rear i would say you wont loos more then 5 hp though and 5-10 from the low timing...and thats lot

the cats are holding you back also man

take the cats off and add more timing...the f13 likes timing

i think you will hit 380+ easy like that...you should but alo take into consideration the milage of the motor

NufNuffZ28

iTrader: (13)

Humm, OK. So its something with the install tuning, etc. Did you do a pre tuning after cam run?


Thanks for the reply's man! I'm missing quite a few ponies somewhere!!!

jerflash

ya i did a pre tune run but it not a good comparo becasue the tune that was in the computer at the time was a tune for heads and a trex because thats what blew up and it was runnin hella rich but just to tell you i was making with that crap tune more then your making now...like 365 or something

but that tune iwht the trex and heads did 450 with bad valvetrain harmonics

NufNuffZ28

iTrader: (13)

Thanks for the help, I just expected more as it did OK before the cam and a couple guys in alocal club have many more miles than I and making more power with smaller cams. Maybe its all in the tune????

87Fake

Wouldn't hurt to richen it up a bit. High 13's is a little lean, then you could add a little timing and see what happens.

NufNuffZ28

iTrader: (13)

Will do, just stoped as numbers were SO low that was thinking may be something else wrong? Not sure If I should check teh engine out or go for more tuning....Don't want to hurt anything for sure!

jerflash

hey ya richen it up a bit and raise timing
and ahve them check the rest of the tune

ringram

Have you logged KR and actual timing to make sure its tracking your commanded timing?
Also you definately want AFR in the very low 13's to mid 12's at WOT for max power. High 13's is likely a little lean to be burning all the O2 you can.

NufNuffZ28

iTrader: (13)

Yes ringram, no KR at all ad actual timing is topping out at 27, I have the .hpi file from the run saved on my computer if anyone is interested in seeing it.

GuitsBoy

iTrader: (4)

Like the others have already said, richen it up and bump out the bottom right quadrant of the timing table to 28 degrees. I would also pull and reinstall your wires. I had two cylinders down when i first put my cam in and I was wondering why it was so choppy, but i drove it around like that for a few days until i bothered to check it. Since then Ive also had plug wires come loose twice. They dont always cooperate, especially number 6 and 8 for me.

NufNuffZ28

iTrader: (13)

Guits....Good advice. I am checking the wires and plugs tomorrow to see if any are fouled!

What did your car make, before and after the tune?


Keep it coming yall!!!

Alvin

iTrader: (2)

I'd add.. don't be afraid to pull some timing out also.. I've made good power by pulling timing out of factory cars on occasion. If you add a 1.5 degrees and the car picked up 8 hp across the board than you know you went in the right direction. If you pretty much backed up the previous run than try pulling a degree out from the orginal setting.

Also, listen to the car.. you can hear them either flat or harsh on the dyno. What I mean by that is you can sometimes hear them flat on the dyno in a certain RPM range.. add some timing to that area alone and be rewarded with a broader curve or well.. you catch my drift.

If you where near Charlotte I woudln't mind giving you a hand... we do dyno time for $100 a hour with wideband and I don't mind helping out guys with free hints...

GuitsBoy

iTrader: (4)

I dont have any numbers sadly. Dyno pulls are retardedly expensive around here. I use a g-tech to tune with, but I wouldnt feel comfortable quoting those numbers as factual. I am certain I picked up a lot more than the 16 HP you picked up. Car turned into an outright animal especially with the 4.10s. I have a friend with similar mods with an f11 who made better than 400 rwhp, although no 4.10s, so its hard to judge based off that.

How about posting your .hpt file so we can all take a look. Maybe between all of us on this thread, we might pick up on something, or maybe its already good to go and the problem is mechanical.

NufNuffZ28

iTrader: (13)

Well, did some work on it tonight. Turned around teh set screw on teh TB so that I can adjust the idle a little and help with the surging, replaced my O2, and pulled a couple plugs. Here they are








I can e-mail it to you if you throw me your e-mail, but not sure how to post it! I need some PT tuning for SURE!!!!!!!!!!!!!!!
Pretty fouled. I believe the stock tune was soo out of whack it fouled out my plugs over the course of driving it before. Now I gotta get this Part throttle stuff down!!!

Anyone wanna help with that??


Chris

87Fake

Those are pretty nice. Have you done any VE tuning?
I would suspect that your VE table needs some work, maybe alot. With bigger cams you lose efficiency down low, and don't need as much fuel as even a stocker would.
For me, stock VE was too high under 4400 rpm, then too low from there up.

NufNuffZ28

iTrader: (13)

None yet, kinda new to tuning, but may have some help coming, so I THINK I found at least some of the problem. I did just realize all of those were from the drivers side(side that had the bad O2 I relaced tonight) I will grab one from the passenger side tomorrow!

Not sure on the VE's as I got a drivable tune from a member on this board