rs32 Posted June 7, 2006 Report Share Posted June 7, 2006 Hoping to get a debate started here about the realities of remapping a naturally aspirated engine. Have had a dyno run done at QST today and they have some interesting opinions about whether remapping actually does anything to a N/A engine. In their opinion it makes bugger all difference - and is completely pointless. They almost went as far as suggesting that the rolling road software used by various tuning houses can be tweaked to effectively invent the "after remap" figures on a dyno plot. If this is the case, how would we know that a remap is actually increasing peak power/torque rather than just changing the driving characteristics so that it feels more powerful due to lower rev ranges for max torque etc. I mentioned by old Mk4 V6 4motion to them - that showed 212 bhp before and 230 bhp after the remap and felt slightly quicker - but was it actually producing any more power ? Not so sure now Would be interested to know peoples' opinions on this as have decided not to bother with a remap on mine - the gains are negligible above the engine + Milltek combination that I currently run and am concerned about warranty implications with the ECU on the MkV Golf. What do people think of the above ? today's dyno run (also posted in R32 forum): Link to comment Share on other sites More sharing options...
Philbes Posted June 7, 2006 Report Share Posted June 7, 2006 Superchips state that they can increase the power of the 2.0 litre 147bhp engine in my Accord by 10bhp for around £250. Not sure that I believe it. For my wife's Megane 1.4 litre 95bhp the stated increase is 4bhp. Link to comment Share on other sites More sharing options...
simon_evo Posted June 7, 2006 Report Share Posted June 7, 2006 Given that most modern ECU's will automatically adjust the igtnition and fuelling strategies etc to make allowance for things like performance exhausts and air filters a remap isnt really worth the bother unless of course internal engine work has been carried out different profile cams /gas flowed head for example. On certain N/A engines like Hondas VTEC a remap / ecu flash is beneficial not by makiing huge gains in outright power but because it can introduce alot more torque lower down in the rev range by switching cam profiles earlier. Link to comment Share on other sites More sharing options...
pritesh Posted June 8, 2006 Report Share Posted June 8, 2006 In all Honesty its hardly worth it if your engine doesnt have a Turbo or supercharger. A mate of mine had his A4 2.0 engine done against my advice spent hundreds of pounds...and it was an utter waste. As it felt no different. The only way you will significant power increase is if your going to do some serious engine work, so we are talking about uprated injectors, fuel pump, fuel rails, cams, reworked port and polished head, gaskkets, full de-cat pipes, lightened pullys...you can see how the list becomes endless and digs a massive hole in ur wallet. Link to comment Share on other sites More sharing options...
CJS4 Posted June 8, 2006 Report Share Posted June 8, 2006 I had my B6 S4 remapped by REVO and it was excellent. Much better mid range torque and generally improved driveability but only around 10% increase in bhp. I guess it's a bit expensive for a relatively small gain but I think it was worth it. Pity REVO haven't got a remap for the B7 Tiptronic yet! Link to comment Share on other sites More sharing options...
P_G Posted June 8, 2006 Report Share Posted June 8, 2006 CJS4, have you also had the exhaust done? I've gone down that route and it made a huge difference in torque and speed, I'm just not convinced the remap will make much more. 10bhp and 10 ft/lbs on a 339bhp / 303 ft./lbs car in terms of percentages and probably practical driveability for anything up to £850? Not sure. Better to make the car lighter I would have thought? Link to comment Share on other sites More sharing options...
CJS4 Posted June 9, 2006 Report Share Posted June 9, 2006 Hi PG No I didn't have the exhaust done on the B6, changed the car before I got round to it! The B7 exhaust sounds so good I am not sure it needs changing, but you never know!! Chris Link to comment Share on other sites More sharing options...
P_G Posted June 9, 2006 Report Share Posted June 9, 2006 Agreed, having heard Drewcam's B7 they sound much better than the B6 S4. I'm still not convinced the gains in remapping are worth the cost or potential warranty hazzards. One way of finding out, have the REVO free trial and independent before and after dyno at the same time and see how it drives. If it is noticably improved, get it, if not, the program is taken off. Link to comment Share on other sites More sharing options...
bencole45 Posted June 20, 2006 Report Share Posted June 20, 2006 Where did you get the Revo done and how much? Link to comment Share on other sites More sharing options...
CJS4 Posted June 20, 2006 Report Share Posted June 20, 2006 Mine was done by Simon at Mega4 in Hersham in Surrey. The remap was £499 and the sps starts at about £120. His email address is [email protected]. Very good service and definitely worth doing!! Link to comment Share on other sites More sharing options...
bencole45 Posted June 20, 2006 Report Share Posted June 20, 2006 Thanks. Link to comment Share on other sites More sharing options...
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