little_chewy_69

iTrader: (2)

hey, just got my cam put in and tuned on last saturday. Was not impressed one bit. only put down 331 rwhp and 311 rwtq. TR tech guys said 380 rwhp would not be out of my reach and should easily make those numbers. When it was dynoed had MAC LT's aftermarket cats and loudmouth. i just put my SLP HF lid and MAF sensor back on when i got home today. But i don't think that will help that much. now im throwing (multiple random misfire, and EGR low circuitry codes. All these codes threw after i left the tuner Also have thrown lean banks 1 & 2. Idle is up and down usually high. Do you think that my tuner did a shitty job er what should i do.

BriGuy

Truthfully it does sound like the tune is off.

little_chewy_69

iTrader: (2)

im running bosch plugs and have heard that they are junk. do you think that could be my MRM DTC.

NviouSS

iTrader: (8)

what kind of dyno was it tuned on?

silverZinSD

iTrader: (7)

Make sure to check for vacuum leaks or a faulty EGR that may be leaking air etc..

Blk97WS6

iTrader: (19)

Even on a mustang dyno, which tend to produce way lower numbers then dynojets, that is WAY to low of a number for a Trex. I put down 355hp on a stingy mustang dyno with a TR230/224, stock LS1 intake, and mac mids.
Either your tuner did a horrible job, or youve got some problems.

ExceSSive

iTrader: (13)

tune or mechanical issue? Hard to say which...it should not be surging though. A friend has this cam and put down 397 with cam, headers and LS6 intake.

little_chewy_69

iTrader: (2)

is all i know about the dyno is that it's a chassis dyno don't think it's a mustang dyno though. they said that my valve lift may be too much for stock heads and said that you can go backwards with to much lift. 231/234 .640/.590 the intake is really high and all the heads that i've looked at cut @ .600 of lift on flow charts so can't really find a good set. Also thinks that my manifold may be restricting air but Blk97WS6 is making 386 i think that my manifold wouldn't be hindering performance already at 331HP.

Second could the cam being too big be the source for throwing codes or could it be my tuner, or both.

yak

iTrader: (15)

it's probibly the multipe misfire codes. it throws your car into limp around mode which sucks.

hammertime

iTrader: (1)

I've read in other threads on here that the stock heads peak about .600, but they don't back up or stall over that, so I don't think that is the issue.

MAC Headers are mid-length designs, not terrible, but not a huge improvement over stock exhaust.

The SLP MAF alters the signal sent to the PCM, therefore rendering your tuning useless - switch back to the stocker.

What did you dyno before you swapped? Those numbers sound low, but they don't mean everything all by themselves. What is your seat of the pants impression?

Is it an A4 or M6? If A4, locked or unlocked? What was the Air/Fuel ratio on that run?

I'd take a look at the plugs and see about replacing them if they are suspect. After you weed out all of the above, then I'd go back to the tune.

studderin

iTrader: (28)

were was the peak power?

post the graph, of the data sheet

Blk97WS6

iTrader: (19)

i agree, put your stock maf on. Im also sure you are suffering with a stock LS1 intake, that cam needs to breathe, but still its not the reason your numbers are THAT low.

Also, your missfire code is normal with a cam like that, but your tuner should be able to take care of it.
And there are PLENTY of people running that cam with stock heads, and are making near of over 400whp.

One more question, is this an auto with a stock stall converter?

PREDATOR-Z

That is not the issue, whyle you might get more trq in the lows with LTs, the MACs will sometimes outperform LTs at higher rpms. Your statement is incorrect.
I run MACs with great results (slightly modded)

Patrick G

iTrader: (14)

Graph needed. Plus, what kind of springs are you running? The TRak cam runs LSK lobes on the intake and will require shimmed dual springs to extract all the power and rpm potential.

hammertime

iTrader: (1)

Thanks for keeping me in check.

I learn something new every time I login to tech

little_chewy_69

iTrader: (2)

Well the bad news is I never had it tuned or dynoed before the swap so i have no base line to go from, and secondly i was so pissed i told him i didn't want the god damn sheet. But he told me that it plateus out at like 3,700 and hp and torque start to fall off from there up. The tranny is a A4 with TCI 3,500 stall. The only differnce that i noticed in all reality was the launch but that could just be from the torque converter and shift kit that were installed at the same time as the cam. Also upgraded to the Crane dual springs and titanium retainers but i didn't go with the comp spring kit because it was 245 bucks. I ordered some NGK TR55's and am gonna put them in tommorow night after i get off work to see if it helps with the MRM DTC.

KEE AUDIO

iTrader: (65)

Just wanted to point out it's not a TREX cam which in this case would be obscenely low!! It's a TRAK cam. Either way it's still a nice size cam: 231/234 .640/.590 112 LSA compared to 242/248 - .608/.612 - 110 lsa. This is one of the cams I'm considering as my next upgrade!!

Blk97WS6

iTrader: (19)

Damn your right, dont know how that slipped by me. Thanks for pointing that out I could have sworn the duration was higher on the "T-rex".

DONAIMIAN

iTrader: (18)

Its a T-rak, not T-rex

Anyways, seems like you need to go back to the tuner.

ProStreetBiker

What springs? Crane 832s? That's a huge part of the problem if youre running those.