R171 SLK 55 Remap

[E55BOF]

I thought I wanted an R230 SL55, but I took the SLK for a run today. My R230 SL500 undeniably has a better ride, but it's more of a cruiser, and doesn't begin to compare in the handling; the SLK just feels so light, wieldy and positive by comparison. On the other hand, the 55K engine is just so good, and the SLK could use a little more urge...

I've been thinking. How do I obtain SL55 performance, or possibly a touch better, in an R171; specifically, a 0-60 time to match? Quite easily and cheaply, perhaps...

Numbers:

Stock R171 SLK 55 - 354 bhp, 376 lb.ft, 0-60 - 4.7 sec; 1540 kg, 7G gearbox
Stock R230 SL 55 - 500-ish bhp, 516 ft.lb, 0-60 - 4.5 sec; 1845 kg, 5G gearbox (laggy)
Stock R172 SLK55 - 415 bhp, 394 ft.lb, 0-60 - 4.5 sec; 1610 kg, 7G gearbox
Mapped R171 SLK55 - 395 bhp, 420 ft.lb. (Claimed, for a Celtic Tuning ECU reflash)

I reckon that should do it, and maybe a touch more, for a total outlay of £300. Mine is already probably a bit quicker than stock, because the exhaust resonator boxes have been deleted.

I could of course go to MSL, but they would cost more, and I'd need an Awayday to Birmingham, while Celtic will come to me.

I'll post again when it's done.

 

[Deleted member 37751]

Stick a supercharger on the SLK - job done.

 

[Teego]

Stick a supercharger on the SLK - job done.

Obviously you need the M113K mill with 470+bhp and 700newtons.
Anyway, if you go for a remap you get what you pay for. Celtic may be £300 but it'll be generic. Go to MSL or Speed Ministry at Mallory Park and £500 will get you custom map with dyno before and after.

 

[E55BOF]

Stick a supercharger on the SLK - job done.

Now that would certainly do the job, but not I think for £300.... And the result would be a before long too...

Obviously you need the M113K mill with 470+bhp and 700newtons.
Anyway, if you go for a remap you get what you pay for. Celtic may be £300 but it'll be generic. Go to MSL or Speed Ministry at Mallory Park and £500 will get you custom map with dyno before and after.

I know the M113K engine well; I've had two E55Ks. It was never fitted to the R171 (or the R172, for that matter).

Remapping n/a engines doesn't give great gains without hardware changes in any event, so a cheap generic map from a reputable tuner will be fine. Besides, I don't want an awayday to Mallory Park any more than Birmingham.