sman

iTrader: (4)

Old setup

LQ9
799 Heads
TR224 Cam
LS6 Intake
Pacesetter longtubes
Built and stalled 4L60e

Made 386/396 on a dynojet

New setup is
LQ9
799 heads
EPS 230/234 .600/.605 112+4
LS6 Intake
FTP Lid + Katech CNC ported TB
Pacesetter longtubes
Same Built and stalled 4L60e

Made 384/378 on the exact same dynojet exactly 1 year and 2 days later.

Graph attached. Blue line is old setup, red is current.

Any ideas?

sittinlovely

iTrader: (20)

Have you had the car on the road yet? Did it feel weaker than your old setup?

sman

iTrader: (4)

Yup, feels about the same, aside from it continuing to make power up top so we are spinning it higher.

Really now that I think about it, on the 1 > 2 shift the *** end always broke loose for a while. Thats not the case anymore, could be a symptom of the missing 20 or so ftlbs of torque.

Blk98Vert

iTrader: (2)

Whats the AFR?

intenseblue

iTrader: (1)

Torque could be attributed to DCR maybe. Depends on the ICL the 224 was installed. Power could be the just normal engine wear. Looks like it was a similar ICL to the 230 judging by it's power peak

sman

iTrader: (4)

Honestly, I do not have a wideband in the car. But there is a bung in the y pipe that the tuner uses. Same guy tuned it both times. Said everything was a-ok.

Injector duty cycle was a little high he said, but acceptable. I have some GM ASA injectors to put in before we hook the bottle up for some extra insurance.

Plan to hit with 100 to 150 wet shot.

Blk98Vert

iTrader: (2)

Something is definitely wrong, what was the duty cycle? What springs do you have?

sman

iTrader: (4)

Springs are PAC 1518's. Same springs I ran with the TR224, they were also recommended by EPS for this cam.

Injector duty cycle is close to 100%, tuner was less than thrilled by it, but no matter how much he beat on the car AFR was always safe and consistent.

99Bluz28

iTrader: (35)

Okay just to be clear, did you have it dyno-tuned with the GM ASA(40lb) injectors in it or was that with the stock injectors?

Gunslinger09

Was the cam degreed in when it was installed? That can cost you some power.

sman

iTrader: (4)

That was with the GM 28.6 lb injectors. The new ASA injectors have not yet been installed. I just got them.

Neither cam was degree'd. Both were installed dot to dot.

99Bluz28

iTrader: (35)

With near 100% duty cycle and a safe and consistent AFR, that doesn't necessarily mean optimum AFR for max hp/tq. I bet you'll see a nice power increase with it tuned with the larger injectors.

TXZ28LS1

iTrader: (5)

you definitely should have made more power

sman

iTrader: (4)

Thats what I thought. I have an M6 friend with 243's on an ls1 making almost 430 with a slightly smaller cam by EPS.

I was really hoping for that elusive 400 number ive been chasing for years...

DaFireMan

iTrader: (5)

REDYNO after the injector install and post results!

thunderstruck507

iTrader: (18)

How many miles on the springs and did you check them for pressure? That dip right after peak doesn't look right.

What kind of exhaust setup?

Aside from that a compression check would be a good idea as well as a leakdown test to make sure your still in good shape on all cylinders. A lot can happen in over a year.

sman

iTrader: (4)

The springs have close to 15k on them. Did not check them.

Exhaust setup is pacesetters, y, 3in cutout, slp dual dual


Everything else aside, I think the real problem was found....

I talked to the tuner yesterday who data logged the pulls, he picked up 3-400 rpm of converter clutch slip the whole pull. Which would partially explain the bumpy graph, and also showing low on power. Took the car to work yesterday (first time since the dyno pulls) and noticed converter slip just before getting off the expressway, it was quite bad by the time I got the rest of the way to work.

Was leery about driving it 20+ miles home, but did it anyway. Guess I shouldnt have, the TCC linings must have made their way through the trans as by the time I got home the 3-4 clutch pack was a goner. Takes 4k in 3rd and 4th to keep the car moving.

Hoping that the slipping converter clutch and possibly slipping 3-4 pack was the real problem here. Picking up my new converter tonight and will tear into the trans this weekend. But black as night trans fluid is never a good sign.....

thunderstruck507

iTrader: (18)

Yeah I would say you found the culprit.

Sorry to hear that but it should be stout once it's back together for sure.

Beotch

In for results after new stall is put in.

Good luck!

Ellesone

I have seen a cam be as much as 6* off... if you dont degree it in you have no idea what you have.. Doesnt matter if they are both dot to dot... its how the cam was ground at the cam mfg