handfulz28
New member
FINALLY hit the test day at Sebring on Friday to break-in our new motor. Morning sessions were 4500RPM limit; ran fine, pulled easily, felt like there was plenty more.
Afternoon sessions, bumping the revs up, my co-driver said he felt a surge mid-way through, and brought it straight in. Next session I go out, and it'll barely pull 6kRPM in 4th, and really struggles to make headway in 5th.
Now, I know this shouldn't be the ECU fuel-shutoff, because we have a modded ECU (speed-limiter only at this point); besides, we've hit the limiter before, and this was just a "no power" situation.
However, the car now has 4.36 gears, so I don't know how that affects the ECU.
At this point, we're gonna do a compression check and leak down, check the fuel psi, and try to figure out whether or not the cam is timed correctly. We set the ignition timing to 15 or 18 degrees (co-driver did that, so I'm not sure), but we've got to check that again to see where we ended up. I'm about to get on the phone with JWT and plop down a chunk of change with them [planned to do that anyways, just didn't have time before this test day].
The motor has the over-sized pistons, but is otherwise 100% stock, with a Hotshot header and open 2.5" pipe. We noticed a small leak developing at one of the exhaust welds, but I doubt that would restrict top-end power this much.
If anybody has any other ideas, I'm listening. My fear is I didn't get the cam timed properly. And that has me freaked out because of Dave's(dpc) report of blowing his up because the cam chain was off by one tooth.
On a positive note: the Ground Control/West Tek setup is incredible! The car outbrakes/outhandles everything in ITA (IMHO). I even had the privelege of sticking with a GT1 Camaro through Turn 1, and then almost bumped him in the carousel....hehe Realistically, I don't think he could put the power down because of the bumps in Turn 1. And yes, he left me sucking wind exiting the carousel...but it was still fun.
Michael
[email protected]
Afternoon sessions, bumping the revs up, my co-driver said he felt a surge mid-way through, and brought it straight in. Next session I go out, and it'll barely pull 6kRPM in 4th, and really struggles to make headway in 5th.
Now, I know this shouldn't be the ECU fuel-shutoff, because we have a modded ECU (speed-limiter only at this point); besides, we've hit the limiter before, and this was just a "no power" situation.
However, the car now has 4.36 gears, so I don't know how that affects the ECU.
At this point, we're gonna do a compression check and leak down, check the fuel psi, and try to figure out whether or not the cam is timed correctly. We set the ignition timing to 15 or 18 degrees (co-driver did that, so I'm not sure), but we've got to check that again to see where we ended up. I'm about to get on the phone with JWT and plop down a chunk of change with them [planned to do that anyways, just didn't have time before this test day].
The motor has the over-sized pistons, but is otherwise 100% stock, with a Hotshot header and open 2.5" pipe. We noticed a small leak developing at one of the exhaust welds, but I doubt that would restrict top-end power this much.
If anybody has any other ideas, I'm listening. My fear is I didn't get the cam timed properly. And that has me freaked out because of Dave's(dpc) report of blowing his up because the cam chain was off by one tooth.
On a positive note: the Ground Control/West Tek setup is incredible! The car outbrakes/outhandles everything in ITA (IMHO). I even had the privelege of sticking with a GT1 Camaro through Turn 1, and then almost bumped him in the carousel....hehe Realistically, I don't think he could put the power down because of the bumps in Turn 1. And yes, he left me sucking wind exiting the carousel...but it was still fun.
Michael
[email protected]
And shows 60psi-oil, 15psi-water.