Do cars lose BHP over time + remap question

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  1. Do cars lose BHP over time + remap question 
    #1
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    Thinking of getting my 323i remapped but will only gain around 12-15bhp which will put it up to around 182bhp. That's assuming my car is still at 170bhp after 11 years on the road.

    If, say my car is nowadays around 164bhp would a remap still put it up to 182bhp or would it just add the extra 12bhp to the 164bhp which would put it up to 176bhp.

    Is it worth getting a remap for 12bhp and do cars lose BHP over time?
    Last edited by fallschirmjager; 13-11-2010 at 22:26. Reason: aer
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    Very good question and I have also pondered over this to the point of dissapointment that I didnt dyno my car before modifying it.

    I have a 1998 E36 323i.

    I have a K&N ( shielded ) CAI
    M50 manifold
    Stainless exhaust manifold, sport cat and scorpion back box.
    APtuning remap.

    She is currently producing 197.4 bhp with 255NM of torque.

    I am very happy with that result. With regards to remapping Naturally aspirated cars I think it is more of the transformation of power delivery than solely power increase. With modifications I believe that the remap benefits them all greatly and makes the acceleration and peaks of the gear range better and smoother.

    I hope this helps a bit.

    I have my dyno graphs in the Tuning forum in the dyno thread.
     
     

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    fallschirmjager (13-11-2010)

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    Thanks for that mate. Looks like it's worth getting done then.
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    They can lose power of time from wear, intake runners gunking up, cylinders coking up, tolerances wearing out, but there is usually a decent spread of power figures around an engine, probably +/-5bhp which can be due to inaccuracies.
    Before and after runs will show you the total increase even if all the numbers are a bit off.

    It's the final transmission losses that cause the problems, they are always best guesses / estimates, so even if you get a low figure on a dyno, remember it had to estimate the losses and can quite often be a few bhp out.

    Even the temps of the engine will make a difference, cold will give lower figures which the thicker oil, as it warms up it'll get to a perfect operating temp and then work the best, and then heat up further due to the fact you struggle to get the same airflow from a fan as you do driving, the tyres can heat up from getting pinched between the rollers and it'll start to lose power again.
     
     

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    Glad to help. I have never heard anything bad about remapping ever other than people maybe being a bit disillusioned that a remap will turn there car into a rocket ship.

    I noticed your forum name,are you a para or ex para?
     
     

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    I'm 3 PARA mate. Still serving though with just over a year to go to my 22.
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    i don't know if 12-15 bhp is whatyou will get?? i would have said more around 5-6bhp with a different in drivability and response!
    i wouldn't consider a re-map with out first giving the car a full service if its not been done for a while and also put on any mods i may want to get the best from the tune up! as said nearly all cars lose bhp, i had a cavalier sri 130 years ago with 85k on the clock, i had a filter, full exhaust and chip, by the common concenses my car should of had 155bhp, but it was rr'ed at 142bhp.

    if you want a bit of extra power i would suggest a 2.8 transplant!, engine swap like for like. if you want the car to fell a bit more responsive get the remap.
     
     

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    My car is 17-18yrs old and has an Endtuning chip and Dave-F induction kit and was rolling roaded at between 212-218bhp...the engine has always been looked after with regular oil changes and good sparkplugs etc..etc..considering it should be around 192bhp from the factory it shows that they don't nesseccarily lose HP....another one is Steve23002's car which had a 218bhp RR...and his car has a chip,Dave-F and Decat exhaust and his car is the non-vanos 325 too.... Also Mistreku's 325 pushes out impressive figures-he has done a fair bit too it though
     
     

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    If you want your car to keep it's power you need regular servicing and you need to use premium fuel. Anyone that does'nt and then shells out for a remap is really spending their money on the wrong things.
     
     

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    Quote Originally Posted by J0N View Post
    If you want your car to keep it's power you need regular servicing and you need to use premium fuel. Anyone that does'nt and then shells out for a remap is really spending their money on the wrong things.
    Deffo. I always use decent fuel in the 325 and the oil gets changed every 5 mins...
    Keeps them tip top for not much money...
     
     

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