charleswrivers
Senior Member
- First Name
- Charles
- Joined
- Nov 3, 2017
- Threads
- 43
- Messages
- 3,736
- Reaction score
- 4,468
- Location
- Kingsland, GA
- Vehicle(s)
- '14 Odyssey, '94 300zx, 2001 F-150
- Vehicle Showcase
- 1
...I don't know.
I do know that running large amounts of boost is going to raise the amount of peak torque in the low/midrange drastically.
Trying to get the car to run at peak toque when the hit comes so soon is like try to bust a nut (heh...) thats big and tough with a tiny handled 1/4" drive ratchet. There's no leverage. A 3/4" longer handled ratchet would be appropriate. Plus, with the higher RPMs more work is being done (you're spinning that ratchet faster)... more power. People look at these dyno curves and see a lot of torque between 2500-4000 RPM... and that's great, but these dynos are across ONE GEAR. Gearing changes the torque delivered at the wheel (bigger (lower) gear more leverage), so staying at a lower gear even past peak torque is still doing more work and letting you go faster... all without the added strain on the engine. We're just finding the clutch is giving way. With a few of our recent members talking about failed engines... there seem to be some mitigating factors. Still with one... 27# of boost of the non-Si that spools earlier, with a quicker, sharper torque spike? If the clutch holds and you have traction and are doing pulls in a high hear that's a tremendous amount of strain on the engine.
In the thread about our cars not having a TD03, this is one of the drawbacks. Yes, it's nice to have a *lot* of torque down low, but on this small engine, it's a lot of strain, and if the clutch isn't up to the task of delivering it, it'll slip. Having less low/midrange torque, shifting it up would have made more peak horsepower and made a faster car... it just wouldn't feel as fast for those folks that like to give it a lot of throttle without a downshift... cause all that torque down low wouldn't be there, making the little engine struggle to turn too small a gear for the speed it's at. The car delivers virtually no more power after 5800 RPM with new maps. That flat out shows the turbo is undersized for the car. It can't move enough CFM of air to keep feeding the engine up top. But, on the flip side... huge torque is available down low. This is the car we have. If you understand this and use it accordingly, you oughta be fine. No, I'm not saying the clutch shouldn't be able to hold more power from the factory, but it seems obvious when/why it's slipping.
I do know that running large amounts of boost is going to raise the amount of peak torque in the low/midrange drastically.
Trying to get the car to run at peak toque when the hit comes so soon is like try to bust a nut (heh...) thats big and tough with a tiny handled 1/4" drive ratchet. There's no leverage. A 3/4" longer handled ratchet would be appropriate. Plus, with the higher RPMs more work is being done (you're spinning that ratchet faster)... more power. People look at these dyno curves and see a lot of torque between 2500-4000 RPM... and that's great, but these dynos are across ONE GEAR. Gearing changes the torque delivered at the wheel (bigger (lower) gear more leverage), so staying at a lower gear even past peak torque is still doing more work and letting you go faster... all without the added strain on the engine. We're just finding the clutch is giving way. With a few of our recent members talking about failed engines... there seem to be some mitigating factors. Still with one... 27# of boost of the non-Si that spools earlier, with a quicker, sharper torque spike? If the clutch holds and you have traction and are doing pulls in a high hear that's a tremendous amount of strain on the engine.
In the thread about our cars not having a TD03, this is one of the drawbacks. Yes, it's nice to have a *lot* of torque down low, but on this small engine, it's a lot of strain, and if the clutch isn't up to the task of delivering it, it'll slip. Having less low/midrange torque, shifting it up would have made more peak horsepower and made a faster car... it just wouldn't feel as fast for those folks that like to give it a lot of throttle without a downshift... cause all that torque down low wouldn't be there, making the little engine struggle to turn too small a gear for the speed it's at. The car delivers virtually no more power after 5800 RPM with new maps. That flat out shows the turbo is undersized for the car. It can't move enough CFM of air to keep feeding the engine up top. But, on the flip side... huge torque is available down low. This is the car we have. If you understand this and use it accordingly, you oughta be fine. No, I'm not saying the clutch shouldn't be able to hold more power from the factory, but it seems obvious when/why it's slipping.
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