BlackBeast Posted November 16, 2011 Report Share Posted November 16, 2011 Thought I would post up my dyno graph from last weekend I need to do some datalogging to see what happens to AFRs and ignition timing when on the road, it might answer why the curves peak, dip and peak again especially at 5100rpm. Cheers Steve Link to comment Share on other sites More sharing options...
BlackT5 Posted November 16, 2011 Report Share Posted November 16, 2011 Nice. A list of mods would help though. :) Link to comment Share on other sites More sharing options...
Zappo Posted November 16, 2011 Report Share Posted November 16, 2011 I am running about the same wheel HP right now. I was wondering why the large difference between brake and wheel power? Link to comment Share on other sites More sharing options...
B Mac Posted November 16, 2011 Report Share Posted November 16, 2011 Mod list pleaaase! Link to comment Share on other sites More sharing options...
Jardim Posted November 16, 2011 Report Share Posted November 16, 2011 ^Yeah me too, with those crank numbers he should be around 380whp.... and is his car doing almost 300 km/h at 7150 rpms? thats insane Link to comment Share on other sites More sharing options...
lookforjoe Posted November 16, 2011 Report Share Posted November 16, 2011 Ignoring the wheel & (projected) brake HP numbers, the torque is impressive (isn't HP an extrapolation from torque?). I don't understand the difference in measuring systems used between US/UK. I was asking about that in the Link to comment Share on other sites More sharing options...
nadrepadre Posted November 16, 2011 Report Share Posted November 16, 2011 what do you use to counteract wheelspin? Link to comment Share on other sites More sharing options...
BlackBeast Posted November 16, 2011 Author Report Share Posted November 16, 2011 Nice. A list of mods would help though. Main power mods are:- S60R manifold, GT3017R, internal wastegate, modified Ferrita DP, random 3" cat back, 50mm intercooler, front mounted oil cooler 750cc RC injectors, Walbro fuel pump, MTE custom map, HKS EVC 6 China rods, standard pistons, head work, N/A cams Still need to set up water injection and the DDS3 gauge. Link to comment Share on other sites More sharing options...
ozzimark Posted November 16, 2011 Report Share Posted November 16, 2011 They're assuming you're losing 33% of your power through drag? That seems a little excessive. Nice and smooth though, and pretty good boost threshold on that GT3071R. 0.63 A/R? Is that with the 53.1mm turbine wheel or 56.5mm? Link to comment Share on other sites More sharing options...
BlackBeast Posted November 16, 2011 Author Report Share Posted November 16, 2011 what do you use to counteract wheelspin? A Quaife diff and road legal track tyres They're assuming you're losing 33% of your power through drag? That seems a little excessive. Nice and smooth though, and pretty good boost threshold on that GT3071R. 0.63 A/R? Is that with the 53.1mm turbine wheel or 56.5mm? It does seem excessive, but the maha dyno measures drag on the coast down, it doesn't calculate it by adding a theoretical percentage like a dyno jet would. Plus, it is doing 163mph or thereabouts at that peak power. Yes it's the 0.63A/R, will have to check what turbine wheel as I can't remember off the top of my head. Link to comment Share on other sites More sharing options...
lookforjoe Posted November 16, 2011 Report Share Posted November 16, 2011 A Quaife diff and road legal track tyres It does seem excessive, but the maha dyno measures drag on the coast down, it doesn't calculate it by adding a theoretical percentage like a dyno jet would. Plus, it is doing 163mph or thereabouts at that peak power. Yes it's the 0.63A/R, will have to check what turbine wheel as I can't remember off the top of my head. What size tyres are you running? so the drag measurement is the main difference? The dyno's I've been on here don't bother projecting BHP at all. I've read that measuring drag is not accurate as it's unloaded (engine in neutral?). I'm trying to see what the comparison is between our different measurement systems. With that amount of torque (425+ft/lbs), I'd expect your WHP to be higher, regardless of projected BHP figures. I has a similar 'wiggle' in my last dyno between 5-5.2K rpm; the data logs didn't really reveal anything significant in terms of timing or AFR's (other than the fact that the timing pull @ 22psi was pretty horrible in my case) -they let me sit in the car & data log on the two pulls to compare with their data printouts. Link to comment Share on other sites More sharing options...
ozzimark Posted November 16, 2011 Report Share Posted November 16, 2011 Then it calculated something wrong. 33% loss is automatic AWD territory, manual FWD should be seeing in the 10-15% range. Link to comment Share on other sites More sharing options...
Brickbox8398 Posted November 17, 2011 Report Share Posted November 17, 2011 (isn't HP an extrapolation from torque?). You are right. HP is how much work (power) the engine is doing, torque is the rate that it can do this work. The equation is HP= (Torque * RPM) / 5252 Link to comment Share on other sites More sharing options...
Brickbox8398 Posted November 17, 2011 Report Share Posted November 17, 2011 You are right. HP is how much work (power) the engine is doing, torque is the rate that it can do this work. The equation is HP= (Torque * RPM) / 5252 Woops got the first part backwards i think? HP= rate of doing work, and torque=the actual work Link to comment Share on other sites More sharing options...
ozzimark Posted November 17, 2011 Report Share Posted November 17, 2011 Well said. Note that 5252 only applies with horsepower and foot-pounds. For kW and Nm it's 9554. 1 hp = 0.7457 kW 1 Nm = 0.7376 Ft-lbf Edit, and yes you did. Torque is "work" and power is the rate at which work gets done :) Link to comment Share on other sites More sharing options...
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