Need driver to test this tune

[moparjay]

thanks for the feedback. i’ll keep driving it to see if I can improve my lap times. i’ve tried the drive line assist before but found myself watching it instead of the track

[ERS_JOHNSON]

I will put my own tune up either tonight or tomorrow so you can compare. It may not work for you but its worth a shot.

[HLR_Juggernaut]

I havn’t tested the car, I’m having a lack of time due my tuning comp and real life taking much more time then I expected.

Anyhow, I checked trough this thread and I agree with Toffo and JOHNSSON, the race tranny is waste of PI 99% of the time specially in any car that has 5.7 V8 or 5.9 Racing V8

This is because those large displacement engines produce huge amount of torgue on midrange. Yes the acceleration is best on high revs but the torgue on the midrange is what makes those engines so great. basicly the engine is good from just below 4000rpm and up.

I once made comparison on old LeMans, we were talking about displacement upgrade but this test more than anything brought up the nature of the engine.

@HLR Juggernaut

I tried to do some testing using 2 different engine to get massive differences to point out the differences. How ever the differences were surprilingly small
Car used Toyota sprinter trueno
Engines used 2.0 VVT and 5.7 V8

Non engine parts used: Sport tires to remove wheelspin issues
only non adjustable weight adding/removing parts (wheels / driveline)
Only adjustable parts: sport gearbox, so I could set the final drive optimal for both engines.

All in all, I tried to make the build as equal as possible so that only thing that really changes would be torque.

With V8 I got to 325hp, 350lb-ft, 2268lbs, on C-489
With V-tec I got to 325hp, 216lb-ft, 2264lbs, on C-484

On absolute Top speed V-tec won, as the V8 ran out of gears,
Acceleration 0-top speed
On acceleration on gears that suited the V8, the V8 was significantly faster, as Vtec couldn’t get moving
On acceleration on gears that suited the V-tec The V8 was slightly faster, even though it had traction issues.
On acceleration on gears which suited each on their own, the V8 was again clearly faster

On “corner exit simulation” I started on rolling 60mph with Ideal exit RPM just below peak power, and ended on 120mph.
Vtec won just slightly

How ever we often have the situation that we are not on the ideal RPM range when we exit the corner Therefore I repeated the test adjusting gearing so that we were starting on rev range where you often think “Should I shift down for 1 second to get this thing moving.”
V8 won that one clearly as it had the midrange torque which the V-tec completely lacks.

Conclusions
As what it comes for racing, Acceleration often is way more important than top speed, and high acceleration requires high torque, Therefore high torque is desirable, How ever, Too much torque might lead to traction issues sooner than too much power.

I would say this is the same reason why 1.6 turbo rally engine is so great, As in low class you really don’t care too much about top speed, but acceleration is crucial. And what that engine has more than a truckload. it has torque. and it’s often combined with rather long gear ratios.
With same rev-range but high end power the cars would do easily 200mph but, as you have to short shift like mad man, you barely ever go faster than 140mph. and the long gearing dampens the torque so much that wheelspin isn’t an issue.

As you could see from the stats of the cars in that test, only thing that really changes is the torque, and when weight goes up (trueno is very light car, but most muscle cars are rather heavy) the difference multiplies. you are interested in the “corner exit simulation” note how I focused on the aspect of not being in quite on optimal RPM. V8 excels on it. thank’s to the insane midrange torque.

[moparjay]

@HLR_Juggernaut

I havn’t tested the car, I’m having a lack of time due my tuning comp and real life taking much more time then I expected.

Anyhow, I checked trough this thread and I agree with Toffo and JOHNSSON, the race tranny is waste of PI 99% of the time specially in any car that has 5.7 V8 or 5.9 Racing V8

This is because those large displacement engines produce huge amount of torgue on midrange. Yes the acceleration is best on high revs but the torgue on the midrange is what makes those engines so great. basicly the engine is good from just below 4000rpm and up.

I once made comparison on old LeMans, we were talking about displacement upgrade but this test more than anything brought up the nature of the engine.

@HLR Juggernaut

I tried to do some testing using 2 different engine to get massive differences to point out the differences. How ever the differences were surprilingly small
Car used Toyota sprinter trueno
Engines used 2.0 VVT and 5.7 V8

Non engine parts used: Sport tires to remove wheelspin issues
only non adjustable weight adding/removing parts (wheels / driveline)
Only adjustable parts: sport gearbox, so I could set the final drive optimal for both engines.

All in all, I tried to make the build as equal as possible so that only thing that really changes would be torque.

With V8 I got to 325hp, 350lb-ft, 2268lbs, on C-489
With V-tec I got to 325hp, 216lb-ft, 2264lbs, on C-484

On absolute Top speed V-tec won, as the V8 ran out of gears,
Acceleration 0-top speed
On acceleration on gears that suited the V8, the V8 was significantly faster, as Vtec couldn’t get moving
On acceleration on gears that suited the V-tec The V8 was slightly faster, even though it had traction issues.
On acceleration on gears which suited each on their own, the V8 was again clearly faster

On “corner exit simulation” I started on rolling 60mph with Ideal exit RPM just below peak power, and ended on 120mph.
Vtec won just slightly

How ever we often have the situation that we are not on the ideal RPM range when we exit the corner Therefore I repeated the test adjusting gearing so that we were starting on rev range where you often think “Should I shift down for 1 second to get this thing moving.”
V8 won that one clearly as it had the midrange torque which the V-tec completely lacks.

Conclusions
As what it comes for racing, Acceleration often is way more important than top speed, and high acceleration requires high torque, Therefore high torque is desirable, How ever, Too much torque might lead to traction issues sooner than too much power.

I would say this is the same reason why 1.6 turbo rally engine is so great, As in low class you really don’t care too much about top speed, but acceleration is crucial. And what that engine has more than a truckload. it has torque. and it’s often combined with rather long gear ratios.
With same rev-range but high end power the cars would do easily 200mph but, as you have to short shift like mad man, you barely ever go faster than 140mph. and the long gearing dampens the torque so much that wheelspin isn’t an issue.

As you could see from the stats of the cars in that test, only thing that really changes is the torque, and when weight goes up (trueno is very light car, but most muscle cars are rather heavy) the difference multiplies. you are interested in the “corner exit simulation” note how I focused on the aspect of not being in quite on optimal RPM. V8 excels on it. thank’s to the insane midrange torque.

i see the point you are making and just so everyone knows, i wasn’t doubting anybody. I’m kinda counting on just the opposite actually. I think I bring to much “real life” car building when I’m setting a car up. I’ve been around cars and racing since I can remember and while that knowledge doesn’t hurt to have in this game, I think sometimes you’re better off without it.
Anyway, race tranny was gone 5 minutes after i read the post replaced with the old faithful 4 speed and, in that car, I found that I prefered it. I’ve got an R34 just about where I want it and the Ferrari F40 is showing some promise. I think…