Is the result of an Engine Rebuild random?

  • Thread starter Thread starter RogsR34UK
  • 15 comments
  • 1,522 views
R

RogsR34UK

Messages
1,603
England
Near Oxford, UK
Messages
RogsR35UK
Messages
RogsR34UK
The thought of this never crossed my mind until a little while ago.

When it appeared in the UCD an Ivory (or whatever) '67 Skyline 2000 GT-B Sedan appeared so I had to buy it, Mileage was high so I did the Engine and Chassis Rebuild. End result was 126 HP.

In the Collectors Dealership, the latest update of content produced a red version of the car (looks nicer than my original) so I duly purchased it and did my usual Chassis and Engine Rebuild due to mileage. This time the identical car other than colour had 129 HP. Needless to say I am a little concerned.

I have visions of save backups and Engine Rebuilds, noting the resultant horsepower and trying to get the best possible deal for the (in some cases) silly prices that are charged. For that money I would expect a brand new factory fresh engine!
 
i dont have the answer to your question, but i like the idea that each individual car's bhp can vary. it works that way in real life with engines, amplifiers, etc. so long as you are getting the minimum advertised power rating, you should be happy. sometimes you get luck and get more power than advertised...
 
I really don't know but was the original mileage much different in both cars? It may have an effect (although an engine re-build 'should' rectify this).
Also, have you driven the red car any distance yourself since the re-build? Further maybe than your original ivory one? The engines 'break-in', in the first hundred or so miles before reaching peak output.

Renrag
 
I have not used either car after buying them. Horsepower after a rebuild does not increase like a new engine (certainly not on my FGT anyway). I will check the mileage on those two Skylines, though the rebuild should negate the effects of any mileage.

Looks like the save backup is going to come in useful for an experiment in Engine Rebuilds... I will post my findings in a while. All I need is a suitably powerful high mileage car as the source of my testing.
 
My b-spec X2010 has had 4 engine rebuilds with a different amount returned each time. I can't tell if its just going down or wether its random though.
 
zk523
i dont have the answer to your question, but i like the idea that each individual car's bhp can vary. it works that way in real life with engines, amplifiers, etc. so long as you are getting the minimum advertised power rating, you should be happy. sometimes you get luck and get more power than advertised...
Click to expand...

Yeah, true, not all cars have exactly the same BHP.

A few years back I used to attend an aircooled VW club, a guy there had a similiar convertible bug as mine and we got on pretty well. His job was to test cars, but he had to test the car and sign it off before it went to the dealer, he wasn't a prototype test driver or someone who did the suspension setup.

He worked for Maclaren then moved to Lotus, he was lucky enough to work at Maclaren when they were building the car for Mercedes, he said that most cars felt similiar but now and then one would feel a bit soft and another would be a beast.

In between checking things like electric windows, brake lights, indicaters etc he would also have to check things like the ABS, which required builidng up alot speed and then braking hard. He reckoned that some cars he could physically feel the difference in power, even though all cars were supposed to be built to similiar specifications. Maybe this is what Polyphony are trying to recreate in GT5, some cars just have that little bit 'extra'.
 
Well I did some testing on an RX-7 Type RZ '93. I did four Engine overhauls and got 260 HP each time

Experimented with an FGT. Overhaul at around 3K miles was 936 HP and also the same at 6.2K miles

Checked the Skyline and the quoted HP is 123 HP. Red car has done 9.7K miles and gives the 129 HP. The Ivory car has done 57K miles and gives 126 HP.

Looks as if mileage does affect the resultant horsepower as that is the only variable for each car. I need to watch out for a "low" mileage Charger R/T '70 to confirm that. Mine is upgraded. I have the high mileage car which has done over 300K miles (I suspect that high mileage cars come in a differnt colour as mine is purple where the normal one is "pink"). When I see a normal mileage one in the showroom I will do a comparison.
 
And here I thought the rebuilds returned the engine to completely stock condition! What a bummer.

That means my rares are staying as undriven as possible, now... :(
 
It certainly looks as if mileage is the key factor in an Engine Overhaul, Now if I could just find the "pink" Charger I could probably give a definitive answer.
 
So basically the "Engine Overhaul" doesn't work, or doesn't work as it's supposed to.:ouch:
 
You certainly don't get a "new" engine.

Another piece in the jigsaw...

I have a 0 mile Merc 190 EVO II and one with miles and this is the result.

0 miles + Oil Change - 235HP and 25 Kg/m Torque
29,428 miles + Overhaul - 240 HP and 26 Kg/m Torque

So the Overhaul appears to give you the power level of a new engine that was run to its first peak (Max for a new engine) and then run until it falls to its next peak where it stays presumably for a fair while. This is somewhere between the max power and the straight from the showroom with oil power.

Now all I need to find is a "pink" Charger to get a comparison of two widely different used mileages.
 
Sorry for the double post, but I have to use a PS3 (with its limited buffer) to post. Buffer was full for last one, so I couldn't edit this in.

Found the Charger...

0 miles + Oil - 382HP
34,320 miles + Overhaul - 389HP
221,776 miles + Overhaul - 374HP
Quoted HP = 374

Approximate Percentages of Quoted HP with oil or overhaul with a little guesswork!
0 miles - +2.1%
9,7xx - +4.9%
29,428 - +4.3%
34,320 - +4%
57,xxx - +2.5%
221,776 - 0%
 
I think overhauls are bugged.

Bought a brand new GT-R SpecV and maxed it out to about 84X hp. (With oil change) So I'm like sweet, this car is as fast as it can possibly be. WRONG.

Put about 2,000 miles on it grinding. Was down to about 82X hp.

Did an overhaul, and I get 86X hp.

Why on earth would my rebuilt GT-R have more HP than when it was brand new?
 
because you didnt check it before the 2000 miles when it still had good oil and was broken in fully.

if you checked it after about 200 miles of driving and do an oil change it will be sitting at 86X without an overhaul.
 

Latest Posts

Back