How much mileage makes an engine overhaul worthwhile?

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Tyger

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I was experimenting with this earlier, particularly with standards. I picked a random car, did an oil change and noted the power. Then I did an engine overhaul but was left with the same power. I then hoped that the overhaul is only worthwhile to restore power lost by me as the driver, through over-use.

Sadly I was wrong, as bought another standard with high mileage (about 84k miles), before oil change was 244bhp, after was 257bhp but after an engine overhaul, was 270bhp

This seems a shame to me as whilst it's realistic, if I want to test and compare cars I will need to do an engine overhaul (and probably chassis too) on a lot of the standards...a lot of $$$

So does anyone know if there is a mileage point where a car starts to lose power? If not I will try to figure it out myself, but will be a lot of trial and error.
 
I have wondered this before, but heard that It only gave you the same hp as an oil change. Keep us updated on your experiment. I would really like to know the truth.
 
My tuned/race cars about 10k miles before a rebuild. Other cars 100k before a rebuild. Dont see the point otherwise. Only do chassis rebuilds on endurance/ grinding cars
 
Might not make much of a difference in A-Spec (at least not until you have really thrashed a car) but for testing and comparing lap times Top Gear-style, it can give a lot of cars a definite advantage/disadvantage.
 
When I acquire a "standard" vehicle, I run 'er over to GT Auto and do the engine and chassis rebuilds. That way, I know I have the car as good as it'll get, before I tune.
 
Yeah i think i will need to do that when i test, just a little expensive if the car was 14 million! Also some cars (low mileage i guess) it seems to make no difference. Ah i should quit talking about it and try it with a few cars, 10-20k mileage, 20-30k etc...there must be degrees of this.
 
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Yeah, if your car has less than 10k when you purchase it, just do an oil change and keep note of the max HP of the car after that.


**One thing I learned is that you can force an engine rebuild if you constantly run the car with dirty oil and don't change it. I had a fairly new FGT that I was using just to grind races, so I thought I'd not worry about the oil changes for a while. It was 935hp when I first bought it, but when I finally changed the oil it only made it back to 895hp.


Another thing is that once you cross over into needing an engine rebuild, your car will continually lose a gradual amount of HP as you use it. After I noticed the HP go down in that same FGT, I changed the oil all the time. Even still, it sits at 844hp right now with an fresh oil change, and no matter how clean I keep the oil it continues to drop HP every few races. On the plus side, I can enter it into some different online events with this level of HP. :)
 
I have a FGT I bought from OCD weeks ago, used it mainly for B-Spec Endurance Races, I always changed the oil and I did gain some BHP but I never got over 900, today I did a chassis maintance and engine rebuild, with 20.000 Kms on the clock, and after this and 3 laps around Daytona ( for engine break-in) it sits now at 932 HP, I believe I will gain a bit more horsepower because I have other FGT at 935 HP.
 
SS_1182
It was 935hp when I first bought it, but when I finally changed the oil it only made it back to 895hp.
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This is a really interesting and pretty realistic aspect of gt5 👍. Running the car on rough oil will slowly wear it down and the damage will just get worse and worse escalating the amount of lost hp.

Though it's a bit irritating sometimes to do an engine rebuild and not gain a single hp :grumpy:. I hope it atleast improves engine response or torque or something. Not sure though.
 
in My Stealth Mazda Le mans car 787B its 880hp I race it a lot its my grinder, after 10 big races, including a few laps around the Ring I went into the engine rebuild screen and it was 800 credits !!! I was like thank you very much my Mazda.

However I have gone into the same screen for say an Audi A4 Touring car and its 500,000 credits to rebuild that engine!!!!!!!!!!. No that is not a typo. it also has a lot of km on the dial.

But 1 thing is for sure, If you rebuild it more often its always cheaper, so every 10 races I rebuild my 787 for 800 credits. If I let it go to 20 it cost me 20,000 credits. so I don't think it simulates wear, but says ok X time on track, oil changes yes/ no and then works out the cost. so keep the oil changes up I do it every 5 races. then every 10 its rebuild for the lemans cars.
For road cars, I havent bothered. just do oil every 10 races, I keep an eye on HP as well, with a new car, oil change B4 any mods, then while racing the Pwr goes up for 5 races, then stays same, that when u do the oil changes , and I never get power loss at all
 
I use one of my x2010's as my b-spec grinder. Its not had a rebuild since i started bspec enduros and so far its half way to nurburgring 24hr's (doing every race it can over and over) so its done ALOT of miles. Also only had 2 oil changes in that time.

I think it has about 1300 BHP. Trying to get it so low that i can race it online against slower cars lol.
 
jjbk
in My Stealth Mazda Le mans car 787B its 880hp I race it a lot its my grinder, after 10 big races, including a few laps around the Ring

But 1 thing is for sure, If you rebuild it more often its always cheaper, so every 10 races I rebuild my 787 for 800 credits. If I let it go to 20 it cost me 20,000 credits. so I don't think it simulates wear, but says ok X time on track, oil changes yes/ no and then works out the cost. so keep the oil changes up I do it every 5 races. then every 10 its rebuild for the lemans cars.
For road cars, I havent bothered. just do oil every 10 races, I keep an eye on
HP as well, with a new car, oil change B4 any mods, then while racing the Pwr goes up for 5 races, then stays same, that when u do the oil changes , and I never get power loss at all
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Everything said here is wrong, stealth and chromeline cars get a discount so rebuild and overhaul only cost 500-800cr

On normal cars anything which is worth more than 1mill costs 500k for both
 
When you changing oil your hp should raise up a bit.. When you have done some racing it will go downwards slowley. Then you'll change your oil again and it should become as high as the last time.. But at some point it wont get that high anymore, in fact the top hp (after changing oil) will increase with only a few more hp (not as much as it used to). This is a sign where you should want to do an engine-overhaul, but you dont really need to do this before the hp almost wont increase at all after an oil change (increase above original (b)hp). This is just my opinion though.
 
o9lifted
When you changing oil your hp should raise up a bit.. When you have done some racing it will go downwards slowley. Then you'll change your oil again and it should become as high as the last time.. But at some point it wont get that high anymore, in fact the top hp (after changing oil) will increase with only a few more hp (not as much as it used to). This is a sign where you should want to do an engine-overhaul, but you dont really need to do this before the hp almost wont increase at all after an oil change (increase above original (b)hp). This is just my opinion though.
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This is true for any car, but for the fact that depending on mileage the car may not have been 100% in the first place. So after your first oil change, that often isn't the maximum power available, but you will see that when you finally overhaul the engine.
 
I purchsed the BWM V12 from the UDC and it had +22k miles. It was at 500 something hp and after the overhaul and oil change, it was over 850 or something.
 
Tyger
This is true for any car, but for the fact that depending on mileage the car may not have been 100% in the first place. So after your first oil change, that often isn't the maximum power available, but you will see that when you finally overhaul the engine.
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Are u talkin about used cars u buy from the UCD? aint that openly? I allways do an overhaul when gettin cars from the UCD.

Or are u doing an overhaul on new cars bought from the dealerships? with 0 milage?
 
Neocodex
I purchsed the BWM V12 from the UDC and it had +22k miles. It was at 500 something hp and after the overhaul and oil change, it was over 850 or something.
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The overhaul process changes the oil too. No need to do an oil change before engine overhaul.
 
I have been looking into this too and I find based on the nascars that after 200 miles the car will hit its maximum power output...AFTER AN ENGINE REBUILD.

I've been putting all my cars into the races that have Indy as 20 laps equals around 50 miles and even coming last I still get around 30-50k plus the mileage, so 4 times and your cars will unleash their full potential.
 
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