Oil on a clutch make a dyno graph like this?
01-18-2013, 07:09 PM
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Oil on a clutch make a dyno graph like this?
NOT A HONDA MOTOR, but close enough.
I upgraded the supercharger from a MP62 to a TVS1320 and have a ~13PSI pulley on it. This should take me to at least 300WHP, more likely closer to 320-330WHP.
When I got it dyno'ed it was making 13 PSI and the air fuel ratio was upper 10's.
It only made 260HP / 165TQ, but the torque was INCREDIBLY flat. Like unnaturally flat for a engine.
So it caused a lot of confusion for me, because it was essentially missing a whole cylinders worth of power. But the boost was there and air fuel was there. So the only thing that seemed to make sense was that maybe the timing was very retarded.
I also had a small oil leak at the time which I thought was coming from the oil pan gasket. Well after repeatedly checking the leak I have come to think that maybe the flywheel bolts are seeping oil and its getting on the clutch. And that the clutch hit a torque limit due to the slippery surface and thats why the torque is so linear. I did see some smoke coming from the engine bay when it got went through the top half of the RPM's, but I assumed this was because of the header that needed to be resurfaced. But now I'm thinking that may have been oil/clutch material getting rid of the excess torque.
After thinking back, I can't remember if I used Loktite on the flywheel bolts. I think I just used some lube that came with the clutch.
So have any of you ever seen something like this? Is it possible?
I should add that the clutch does not appear to slip during normal usage, but you have to consider that I don't even weigh 2000 pounds and that 260 at the wheels is still more then any stock Lotus Exige was sold with...so its still plenty of power to move the car normally.
I upgraded the supercharger from a MP62 to a TVS1320 and have a ~13PSI pulley on it. This should take me to at least 300WHP, more likely closer to 320-330WHP.
When I got it dyno'ed it was making 13 PSI and the air fuel ratio was upper 10's.
It only made 260HP / 165TQ, but the torque was INCREDIBLY flat. Like unnaturally flat for a engine.
So it caused a lot of confusion for me, because it was essentially missing a whole cylinders worth of power. But the boost was there and air fuel was there. So the only thing that seemed to make sense was that maybe the timing was very retarded.
I also had a small oil leak at the time which I thought was coming from the oil pan gasket. Well after repeatedly checking the leak I have come to think that maybe the flywheel bolts are seeping oil and its getting on the clutch. And that the clutch hit a torque limit due to the slippery surface and thats why the torque is so linear. I did see some smoke coming from the engine bay when it got went through the top half of the RPM's, but I assumed this was because of the header that needed to be resurfaced. But now I'm thinking that may have been oil/clutch material getting rid of the excess torque.
After thinking back, I can't remember if I used Loktite on the flywheel bolts. I think I just used some lube that came with the clutch.
So have any of you ever seen something like this? Is it possible?
I should add that the clutch does not appear to slip during normal usage, but you have to consider that I don't even weigh 2000 pounds and that 260 at the wheels is still more then any stock Lotus Exige was sold with...so its still plenty of power to move the car normally.
01-19-2013, 04:26 AM
#3
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Re: Oil on a clutch make a dyno graph like this?
Looks like every supercharged Honda engine I have ever tuned.
And that's about 120 or so.
EDIT: And why so rich? No cooling?
And that's about 120 or so.
EDIT: And why so rich? No cooling?
01-19-2013, 08:24 AM
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Re: Oil on a clutch make a dyno graph like this?
You'd see a lot of slip if oil had saturated the friction material, and you'd see the power graph go all crazy and you wouldn't even be able to finish a pull
Looks like a normal well tuned graph for a boosted motor, flat torque curve means that however you're doing it is a good match for the motor
Looks like a normal well tuned graph for a boosted motor, flat torque curve means that however you're doing it is a good match for the motor
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