Marine Intake is on and running.

[Hog]

Nice package there Fast, you've got LS1 power from the GEN !E Vortec, plus its running through the HD drivetrain, better than LS1 power!

That lean spot you're speaking of, was it a lean bog when cold? I myself had some decent lean bogging upon throttle application after the swap. AT least 3 other guys I know have had the same issue, exageratted when cold, not as bad when engine is warmed up.
There are no "throttle stomp" or "pump shit" in the blackbox PCM, IIRC I did some major VE tuning as a work around.

Do you think that the stock L31 intake manifold are major obstacles to making power on the L31?

Cant wait to see after the Thorleys are installed.

Someone asked about prices, I paid around $600 for mine, it came with brand new parts to assemble the USCAR connectors, colour coded wires, wiring diagram, all gaskets for instal, marine t-body, marine IAT/MAP sensor, cleaned and flowed marine injactyors(25 lb/hr@43.5psi), machined for Vortec bypass, a couple new brass waternecks, new pig iron quick connect heater connector, it was a very good kit.
My retrofit was done for under $1000 including tuning. IO cant remember if my Tunercats OBD2 tuning system was in that $1000 or not. I paid $330 for it during a group discount.

Good work man, that torque curve is flat, tough to pic a stall speed with that flatline. Good problem to have.

peace
Hog

[Fast355]

Nice package there Fast, you've got LS1 power from the GEN !E Vortec, plus its running through the HD drivetrain, better than LS1 power!

That lean spot you're speaking of, was it a lean bog when cold? I myself had some decent lean bogging upon throttle application after the swap. AT least 3 other guys I know have had the same issue, exageratted when cold, not as bad when engine is warmed up.
There are no "throttle stomp" or "pump shit" in the blackbox PCM, IIRC I did some major VE tuning as a work around.

Do you think that the stock L31 intake manifold are major obstacles to making power on the L31?

Cant wait to see after the Thorleys are installed.

Someone asked about prices, I paid around $600 for mine, it came with brand new parts to assemble the USCAR connectors, colour coded wires, wiring diagram, all gaskets for instal, marine t-body, marine IAT/MAP sensor, cleaned and flowed marine injactyors(25 lb/hr@43.5psi), machined for Vortec bypass, a couple new brass waternecks, new pig iron quick connect heater connector, it was a very good kit.
My retrofit was done for under $1000 including tuning. IO cant remember if my Tunercats OBD2 tuning system was in that $1000 or not. I paid $330 for it during a group discount.

Good work man, that torque curve is flat, tough to pic a stall speed with that flatline. Good problem to have.

peace
Hog

I was able to tweak on the end of injection timing and accelerationenrichment tables to make the lean spot vanish with a cold engine. The latest lean spot was due to the CAI leaning out the tune slightly. Added between 1% and 5% to the MAF table via datalogging amd its now just about perfect. In this cool weather it likes spinning the 255s on it. I think the factory intake, throttle body and intake ducting are all major restrictions to power once a decent cam and exhaust is installed.

[PJG1173]

Fast,
which comp 4x4 cam are you using the 260, 270 or 280? with the 280 cam I can't get more than 24*@3200 without knock on my TBI converted vortec 355.

[Fast355]

Fast,
which comp 4x4 cam are you using the 260, 270 or 280? with the 280 cam I can't get more than 24*@3200 without knock on my TBI converted vortec 355.

Its the 258/262 grind, but I had it ground on a 110° lsa.

[PJG1173]

did a one degree reduction in LSA make a difference? if its the one I'm thinking the out of the box one has 111*

[Fast355]

did a one degree reduction in LSA make a difference? if its the one I'm thinking the out of the box one has 111*

No idea, never ran the 111* LSA version of the cam. After running a very similar flat tappet grind in my 305 in my Vette I just felt the engine would like the 110* LSA more than it would a 112 or 111*. Its also still ground 4* advance on a 106* ICL. Not to mention the idle sounds beefier with the tighter LSA cams.

[1project2many]

There are no "throttle stomp" or "pump shit" in the blackbox PCM, IIRC I did some major VE tuning as a work around.

If you read through the manual for (IIRC) the Accel DFI unit they discuss a mode where AE fueling is done as an automatic calculation rather than a programmed table. They lay the equation out, too. I realize most people have decided the black box is worthless but I'd look at the disassembly to locate AE routines and see if fuel delivery is calculated the same way.

[Hog]

Hey Fast355, I know I have asked you before, but I cant remember the answer and I cant find the post but, with your dyno tuning, what is the marine intake worth power/torquewise on its own. When I did my swap I notice more torque and more power, but that was simply from doing acceleration tests, less power falloff aove 5000rpm etc. So CSFI for cross ram marine intake with appropriate PCM tuning, what increases did you see?
Thanks, I have a guy that wants to do teh swap, but is undecided. He will only be using a xe270hr cam with a 112lsa and wants to know if teh intake swap is really worth it or no.

Thanks man.

peace
Hog