Supercharged, what now?
Drifting
Joined: Nov 2014
Posts: 1,980
Likes: 111
From: Switzerland
so you have 600 nm of torque? no idea how thats possible. very rough calc.: 500nm x 1.75 (pressure Ratio) x 0.88 (drivetrain loss) = 770 nm. so the blower eats up 160nm or something is wrong. do you know the iat, timing and afr? (its a manual, right?)
Last edited by romandian; Sep 9, 2017 at 02:10 PM.
Thread Starter
Racer
Joined: Oct 2015
Posts: 265
Likes: 10
Not sure if you mean its high or low? But yes, the dyno says 611 wheel nm/torque which is approx 450 wheel footpounds. I've read that ECS says the potential with this kit (on stock engine) is 475-485 rwtq and 500 rwhp so I'm just below on both. What do you mean does not add up?
Last edited by CorvetteC5Norway; Sep 12, 2017 at 06:26 AM.
Thread Starter
Racer
Joined: Oct 2015
Posts: 265
Likes: 10
Given that this is rearwheel numbers, any other that can comment on how it looks? I think maybe Romandian thought it was crank torque?
Drifting
Joined: Nov 2014
Posts: 1,980
Likes: 111
From: Switzerland
i would be interested in a graph of a stock c5 as well. not a zo6.
i was thinking its low. engine is rated at 500 nm (what was it, 98? maybe not?) so i assume 450 at the wheels. 611 is only 36% more, while you are probably at 1.6 pressure ratio at 5100. yes, there will be some loss from torque peak at 5000, but still.
what i can say, my 99 pulled 0.34 g in second gear stock and is pulling 0.63 g max without restrictor (give or take 0.01 g) somewhere between 5-6000. im seeing 1.95 pr at 6000.
i was thinking its low. engine is rated at 500 nm (what was it, 98? maybe not?) so i assume 450 at the wheels. 611 is only 36% more, while you are probably at 1.6 pressure ratio at 5100. yes, there will be some loss from torque peak at 5000, but still.
what i can say, my 99 pulled 0.34 g in second gear stock and is pulling 0.63 g max without restrictor (give or take 0.01 g) somewhere between 5-6000. im seeing 1.95 pr at 6000.
Thread Starter
Racer
Joined: Oct 2015
Posts: 265
Likes: 10
i would be interested in a graph of a stock c5 as well. not a zo6.
i was thinking its low. engine is rated at 500 nm (what was it, 98? maybe not?) so i assume 450 at the wheels. 611 is only 36% more, while you are probably at 1.6 pressure ratio at 5100. yes, there will be some loss from torque peak at 5000, but still.
what i can say, my 99 pulled 0.34 g in second gear stock and is pulling 0.63 g max without restrictor (give or take 0.01 g) somewhere between 5-6000. im seeing 1.95 pr at 6000.
i was thinking its low. engine is rated at 500 nm (what was it, 98? maybe not?) so i assume 450 at the wheels. 611 is only 36% more, while you are probably at 1.6 pressure ratio at 5100. yes, there will be some loss from torque peak at 5000, but still.
what i can say, my 99 pulled 0.34 g in second gear stock and is pulling 0.63 g max without restrictor (give or take 0.01 g) somewhere between 5-6000. im seeing 1.95 pr at 6000.
I think the 98 C5 is rated 480 crank NM. If we say 15% drivetrain loss as most work with, that is approx 410 at the wheels-
as for hp, 481 up from approx 300 (stock C5) that is approx 60% up.
But, as Doug said, we are a little bit low, but I'm happy with this for now :-)
Drifting
Joined: Nov 2014
Posts: 1,980
Likes: 111
From: Switzerland
are you logging? what does injector pulse width look like? im surprised by the sharp turndown at 5100. im not seeing that. belt might be slipping.
but im not trying to scare you, i think every belt is slipping at redline more or less. lets wait if doug or somebody else comes up with a graph.
btw, 12-15% loss usually is at max hp, so i was thinking 10%.
but im not trying to scare you, i think every belt is slipping at redline more or less. lets wait if doug or somebody else comes up with a graph.
btw, 12-15% loss usually is at max hp, so i was thinking 10%.
Last edited by romandian; Sep 19, 2017 at 05:41 AM.
Thread Starter
Racer
Joined: Oct 2015
Posts: 265
Likes: 10
are you logging? what does injector pulse width look like? im surprised by the sharp turndown at 5100. im not seeing that. belt might be slipping.
but im not trying to scare you, i think every belt is slipping at redline more or less. lets wait if doug or somebody else comes up with a graph.
btw, 12-15% loss usually is at max hp, so i was thinking 10%.
but im not trying to scare you, i think every belt is slipping at redline more or less. lets wait if doug or somebody else comes up with a graph.
btw, 12-15% loss usually is at max hp, so i was thinking 10%.
I'm not logging anything except when we Dyno. I've thought about installing a wideband afr, we will see.
As I've understood you have done the tuning yourself? It would be interesting to know how you have dealt with the MAF maxing out situation?
Since you asked for a Dynochart for a C5; here is one I found on the internet. Is said to be a bone stock C5 with an A&A kit. Comparing to this one, my car has almost the same power curves. Also the torque development after 5000 rpm...
Last edited by CorvetteC5Norway; Sep 20, 2017 at 02:54 AM.
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Drifting
Joined: Nov 2014
Posts: 1,980
Likes: 111
From: Switzerland
interesting chart, thanks.
the first thing i did was to take off the maf, even before the blower went on. there is nothing to it, i have no idea what its actually for. no drivability issues, even the emissions were better. (you have to tune it out.)
you will not catch me driving the car without a wideband. its an absolute must. its $200. installed in a couple of hours, maybe less if you can find the right wires inside the car. and dont overthink it. just put it in one of the after cat bungs and be done.
the first thing i did was to take off the maf, even before the blower went on. there is nothing to it, i have no idea what its actually for. no drivability issues, even the emissions were better. (you have to tune it out.)
you will not catch me driving the car without a wideband. its an absolute must. its $200. installed in a couple of hours, maybe less if you can find the right wires inside the car. and dont overthink it. just put it in one of the after cat bungs and be done.