Thread: WTF! - EGT's with TRS chip... Td5 manual MSB

IMO you should make a test with stock tyres before a final conclusion, with those huge tyres the whole addaptive strategy of the management might be mixed up as long as the new fuel map was not especially conceived for that by someone who really knows his stuff cos there's a missmatch now it the ECM's "brain" as with those tyres the VSS(vehicle speed signal, part of the addaptive strategy) is unexpectedly low according to the revs and torque delivered at a certain vehicle speed and the fuel map was ''calibrated"" for stock(or max 5% greater) tyres, as your's is manual there's no default value for VSS(only autos have it) so the management will compensate by overfueling.

IMO for those tyres you need dedicated fuel map to not have any issues also if i understood well you dont even have a larger intercooler yet which is not healthy with any remap

can't you take a live data log with a nanocom to see some MAF, MAP, IAT values?

Originally Posted by sierrafery

IMO you should make a test with stock tyres before a final conclusion, with those huge tyres the whole addaptive strategy of the management might be mixed up as long as the new fuel map was not especially conceived for that by someone who really knows his stuff cos there's a missmatch now it the ECM's "brain" as with those tyres the VSS(vehicle speed signal, part of the addaptive strategy) is unexpectedly low according to the revs and torque delivered at a certain vehicle speed and the fuel map was ''calibrated"" for stock(or max 5% greater) tyres, as your's is manual there's no default value for VSS(only autos have it) so the management will compensate by overfueling.

IMO for those tyres you need dedicated fuel map to not have any issues also if i understood well you dont even have a larger intercooler yet which is not healthy with any remap

can't you take a live data log with a nanocom to see some MAF, MAP, IAT values?

I'm not sure if it quite works like that... the speedo is only 10% out compared to GPS, but as far as VSS and RPM are concerned nothing has changed... (gearing is still stock), the car just travels further for each revolution of the tyres, hence the wheel sensors do not read true road speed. Am I interpreting that right?

The thing I can't work out is why it over fuels in 4th but not 5th...

When I bought it they said it was fine to use with 265/75's, and did not recommend a change in IC unless i felt like it.

I have since upgraded to a D2a intercooler (as mentioned before), which is about as good as they get anyway... no intercooler is going to take a further 200*C off my EGT's.

I am curious what it would be like on standard tyres, unfortunately I no longer have any easily accessible.

Thanks for the advice

I made that deduction cos i've swapped the chip from my ECM(tachosoft remap) to a friend's same year D2 with 265/70/16 tyres(mines are stock 255/65/16) and we've got +100/150*C increased EGT on his, he has the original intercooler, i have a performance one...i dont understant that D2a intercooler thing cos afaik the auto intercooler is even smaller than the original manual one due to the oil cooler, unless your manual has a factory fitted cooler which is smaller than the auto, i dont know these things cos manuals dont have cooler around here

i get max 700 uphill with the stage 1 chip and 800 with the stage 2 on mine

about the VSS, the speed sensor's output is AC voltage which grows with the wheel's rotation speed but the manegement "expects" certain VSS inputs according to rpm and driver demand as it was calibrated from factory and when the initial equilibrium is mixed up any kind of things can happen

Originally Posted by sierrafery

i dont understant that D2a intercooler thing cos afaik the auto intercooler is even smaller than the original manual one due to the oil cooler

With the D2a reference, the 'a' doesn't mean auto. It means it's the face lifted Discovery 2. The intercooler fitted to the D2a are more efficient than the pre facelift Discovery D2.

The intercooler is the same for a manual D2a & an auto D2a.

Thanks for that "a" thing, i didnt know that, though, maybe down under all the manual D2s have a geabox oil cooler from factory but for not such warm regions they didnt export manuals with an oil cooler and the performance intercooler for the manual is bigger than the one for auto(300mm / 235mm high)... i should have said that i was referring to performance intercoolers not standard, my mistake cos i said "original" while i was thinking to performance, sorry

about that pre-facelift and facelift intercoolers it means that all the standard intercoolers on the market should be the same now cos i can't find different part numbers for pre and facelift modells, only PCM100220 which they say fits all modells

Originally Posted by sierrafery

Thanks for that "a" thing, i didnt know that, though, maybe down under all the manual D2s have a geabox oil cooler from factory but for not such warm regions they didnt export manuals with an oil cooler and the performance intercooler for the manual is bigger than the one for auto(300mm / 235mm high)

Correct, all manual D2(a)s, in Oz at least, have a gearbox cooler. Which is why we need to make sure any performance intercooler for a manual is gearbox cooler comparable.

Originally Posted by sierrafery

about that pre-facelift and facelift intercoolers it means that all the standard intercoolers on the market should be the same now cos i can't find different part numbers for pre and facelift modells, only PCM100220 which they say fits all modells

Correct, pre-facelift intercoolers were part number ESR3777, this has now been superseded by the D2a part number PCM100220.

pre facelift intercooler 27 mm thick
facelift d2a intercooler 40mm thick
mr lr see what your egt reads after you wind up your boost but smokescreen in 4th ( not good )
sierrafery if probe is in the same spot as your friends then its probably more to do with your intercooler especially if you are running higher boost, that his egt,s are higher than yours ,

Sierraferys chips are still far too hot...