How Do You Maximise A Car's Horsepower?

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BMW_850ci_V12
From what I know, you need to start out with a car at 0 miles and drive a certain amount of miles to break in the engine. (But how many miles? Does it vary by car?) I've tried methods going to different miles on different cars and doing a complex series of oil changes and engine rebuilds but even with every tuning part installed, I find people online that get a bit more horsepower with the same car. So what's the deal? Am I missing something here or are people bluffing to 1-Up my claim?

The reason I'm asking this is because of the new set of classic cars that have just arrived in the OCD that I'm eagerly awaiting to break in. I want to hopefully get them all at maximum horsepower but fear that if I break any of the cars in too much, I will never be able to reach peak horsepower again.

(I did a thorough thread search and didn't find anything related closely enough.)

Thank You

NOTE:*Check the top of page 2 of this thread for crucial update.*
 
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200 miles have i been told that you have to drive, or 320 km. Or like 80 laps around the daytona oval.
 
Crazed_Coupe
Break the car in along with oil changes and engine rebuilds every so often.
Click to expand...

If I'm correct:

Oil Change = every 200km
Engine Overhaul = every 5000km
Engine Break-in = 300km (resets when you overhaul the engine)
 
elitedriver123
If I'm correct:

Oil Change = every 200km
Engine Overhaul = every 5000km
Engine Break-in = 300km (resets when you overhaul the engine)
Click to expand...

That could be correct but I hear a bunch of different numbers as to when you should do oil changes, engine overhauls, and breaking in an engine.
 
elitedriver123
If I'm correct:

Oil Change = every 200km
Engine Overhaul = every 5000km
Engine Break-in = 300km (resets when you overhaul the engine)
Click to expand...

This is what I go by..

To maximize I've heard you do oil change at 0km, break it in, and then just oil change again. Although, I find no difference in hp between doing that and just oil changing after braking it in. People claim to have more but I've never seen a picture proving otherwise. If you're reading the horsepower on mygranturismo.net a lot of the people that have contributed to that site sometimes seem to have an extra 10 horsepower that's not possible.. I have theories as to why, but it shouldn't matter as long as your car;

1) Has all upgrades
2) Is less than 5000km
3) Is broken in (if started from 0) and/or has more than 300km
4) Oil change

if anyone's data is conflicting they're probably lying unless they can show screenshot evidence that proves otherwise.
 
I'm not sure, but I bought the premium Audi RS 6 Avant early in the game and fully tuned it to about 950 hp.
I just bought another yesterday and also fully tuned it. But this one only has 883 hp. Even after an oil change. And I don't think breaking in the engine will make the car gain almost 70 hp.
 
It will when the effects are multiplied by the mods. The effects of an oil change affect the base hp, not the modified one. The power modifier hp is calculated after the oil change / break-in / wear hp modifier is applied... so you can see about a 50-70 hp difference when tuned from around 500 to near 1000.
 
elitedriver123
If I'm correct:

Oil Change = every 200km
Engine Overhaul = every 5000km
Engine Break-in = 300km (resets when you overhaul the engine)
Click to expand...

Engine breakin happens gradually up to 200 miles and when you do the engine overhaul it doesnt return or reset to new level it willl return to your highest bhp when run in. When it doesnt its foobar'd also do regular oil changes and when they dont get you back to max bhp thats the time to do engine overhaul and it isnt set in stone it varies from car to car and especially how you drive it. If you play online a lot as i do the miles dont log if in free practice but do log when actuallly in race.
 
Usually, as i said, drive 200 miles after you have put on all parts, then change oil, and then you have full hp, i know for sure, because thats what i have been doing.
 
mark2002
If you play online a lot as i do the miles dont log if in free practice but do log when actuallly in race.
Click to expand...

And only if Tire Wear/Fuel Consumption is set to ON during the race.

I have broken in 6 Camaro 2010 SS in total now. 4 were done online only. 2 were done offline. 2 of them are RMs, 3 are MAX tuned 2010 SS, 1 is a MAX tuned 2010 SS Edge Special. All 6 of them ended up with the exact same horsepower at 704hp (705hp when viewed in the Garage).

My method of breaking in:

1. Buy new car.

2. Oil Change.

3. RM (skip if not available or not desired).

4. MAX Tune.

5. For online break-in, start lounge or race in online races for 200 miles. Tire Wear must be set to ON.

6. For offline break-in, I just throw it into a few B-Spec races and let Bob do the work for me. ;)

7. Oil Change.

The car will be at MAXIMUM horsepower.

One thing, I have found a glitch during race modification that I have seen on two different cars now. When I did the RM on a Camaro and a 70 Challenger R/T, they both get Racing Exhausts, but they aren't selected (little box not checked at the tuning screen) by default. You have to actually check the box to "apply" the racing exhaust. This can cause one to think their car has lower HP than it should. I've read others on here experiencing the same glitch as well.
 
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GoSpeedRacer
And only if Tire Wear/Fuel Consumption is set to ON during the race.

I have broken in 6 Camaro 2010 SS in total now. 4 were done online only. 2 were done offline. 2 of them are RMs, 3 are MAX tuned 2010 SS, 1 is a MAX tuned 2010 SS Edge Special. All 6 of them ended up with the exact same horsepower at 704hp (705hp when viewed in the Garage).

My method of breaking in:

1. Buy new car.

2. Oil Change.

3. RM (skip if not available or not desired).

4. MAX Tune.

5. For online break-in, start lounge or race in online races for 200 miles. Tire Wear must be set to ON.

6. For offline break-in, I just throw it into a few B-Spec races and let Bob do the work for me. ;)

7. Oil Change.

The car will be at MAXIMUM horsepower.

One thing, I have found a glitch during race modification that I have seen on two different cars now. When I did the RM on a Camaro and a 70 Challenger R/T, they both get Racing Exhausts, but they aren't selected (little box not checked at the tuning screen) by default. You have to actually check the box to "apply" the racing exhaust. This can cause one to think their car has lower HP than it should. I've read others on here experiencing the same glitch as well.
Click to expand...

Why do you do an oil change if it's a new car, or are you talking about a used car? :odd:
 
Crazed_Coupe
Why do you do an oil change if it's a new car, or are you talking about a used car? :odd:
Click to expand...

You should always do an oil change on a new car. It gains horsepower instantly. Try it for yourself. The thought is that the GT5 oil has additives to boost horsepower. I think this is common in all GT games.

I tried it with the Red Bull X1. New it has 1438HP with an oil change is went up to 1509HP. That is a 71HP increase and with the HP will increase over the break in period.
 
WRECKU
You should always do an oil change on a new car. It gains horsepower instantly. Try it for yourself. The thought is that the GT5 oil has additives to boost horsepower. I think this is common in all GT games.

I tried it with the Red Bull X1. New it has 1438HP with an oil change is went up to 1509HP. That is a 71HP increase and with the HP will increase over the break in period.
Click to expand...

Well I know you should after a certain number of miles but I mean right off the showroom floor it'll give you horsepower even if the car has no miles on it?
 
Crazed_Coupe
Well I know you should after a certain number of miles but I mean right off the showroom floor it'll give you horsepower even if the car has no miles on it?
Click to expand...

Yes right off the showroom floor. Give it a try. It has been a given HP gain for all the GT games that I can remember. Most long term players know this to be fact. :) 👍
 
WRECKU
Yes right off the showroom floor. Give it a try. It has been a given HP gain for all the GT games that I can remember. Most long term players know this to be fact. :) 👍
Click to expand...

So after you do it the first time brand new, you should do it again after 300 miles or so?
 
Wow thanks for all the replies everyone. For a game that's been out a relatively long time, I'm surprised that there is no one commonly believed answer. At this point I think I'm going to buy 5 identical new cars and test various methods discussed in this thread and one's I've heard elsewhere to hopefully once and for all come up with a sure conclusion.

I need a premium car from the dealership so its 0 miles and is not hard to obtain at 0 miles like most standard cars. A car that is fun to drive, so something fast with an FR drivetrain (not that other drivetrains aren't entertaining). Something that is well known and pretty common (The car that I'm thinking of is well known for it's 40+ years of history). Finally something that is inexpensive so other people (people reading this) can more easily partake in this study if they choose. So what's the car?

None other than the: Nissan 370Z

1. Buy new car.

2. Oil Change.

3. RM (skip if not available or not desired).

4. MAX Tune.

5. For online break-in, start lounge or race in online races for 200 miles. Tire Wear must be set to ON.

6. For offline break-in, I just throw it into a few B-Spec races and let Bob do the work for me.

7. Oil Change.
Click to expand...

I think I'll start with this as a basis and change some of the variables.

Step 1 is irrelevent as a variable for right now because I'm only testing this one car.
Step 3 is irrelevent as a variable because the 370Z can't be RM'd.
Step 4 is irrelevant as a variable because I'm tuning all of them to the max.
Step 5 & 6 are partially irrelevent as variables because whether or not miles are done online or offline, they still effect the car in the same way if they are the same number regaurding miles of course.

That basically leaves Miles, Oil Changes, and Engine Overhauls as key influential variables. If anybody would like to partake in this "study" with me and post your findings here, I gladly welcome it. And while we're at it, why not record torque as well?
 
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The cars seem to run in at different rates, I've run most of mine to 180miles and got their peak power then, but others take longer. The R35 GTR didn't top out at 897bhp until 260miles (or thereabout).

My mainentance schedule is:
Oil change at zero miles, then every 150miles thereafter.
Engine rebuild every 3000miles
Chassis refresh every 6000miles.

I usually run mileage races against the bobs in practice mode at Daytona or Indy (20laps is 50 miles, normally under 20 minutes) until I hit 180miles, run an oil change, then run another race there for 25 miles (10 laps) to see if there's any change in power. If there is, I'll run it again until I get to 250 miles. Just as a precautionary measure I also redo the oil at this point, although it may not strictly be necessary.
 
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