Difference between 458 & 460 ECU in '98 models?

Post by **atomicpop** » 19 Sep 2011, 13:44

Anyone know if there are actually differences between the 458 and 460 ECU models for the '98 models? All the specs I can find (admittedly not much) are identical. According to IPD's chart, the 458 is indicated for the V70 GLT LPT while the 460 was used in the V70 AWD model.

Long story short is that I found a chipped 458 but both of my cars (V70 AWDs) use the 460. I'm curious to try the chipped 458 but I'd like to feel better about any differences between the ECUs before I do it.

Cheers!
Patrick

Post by **jimmy57** » 19 Sep 2011, 20:20

I have one of each and I interchange them and can't tell any differences. After I drive for a while the fuel trims and idle speed compensations read using a VST show more compensation on one of them but I can't recall which Bosch number ran with lower trims values. Get the 458, it will work.
There were problems with the emissions "flags" for passing certain diagnostic routines with 98 ECM's. The difference may be the ...460 may have the revisions for that issue. AWD's were late intro and may have had that ECM from production start. The diagnostics flags are for emissions compliance monitoring via the OBD connector. Used in areas where emissions are checked for annual inspections. Volvo was an early adopter of this and they had some issues where batteyr going dead, replaced, or disconnected would make the subsequent testing to store the readiness indicators not go off in a timely manner.

Post by **atomicpop** » 19 Sep 2011, 21:18

Excellent, thanks for the details and real world experience. If I get the 458 and try it I'll post a follow up here.

Post by **JRL** » 19 Sep 2011, 22:37

I can't answer the difference but jimmy, the FIRST 1998 I saw was in May 1997, that was a V70 AWD so they were not late production at all.

Post by **jimmy57** » 20 Sep 2011, 08:59

V70 XC had a few week delay for build start after S70 and V70 production. Not late intro like C70 or the when are you ever going to get around to it intro like the C70 convertible.

Post by **atomicpop** » 09 Oct 2011, 23:48

As an update to my original question, it does appear that a 458 EU can be swapped for the 460 version in a '98 V70 AWD.

Full story: I bought the GIAC chipped ECU (which was a BOSCH 458 out of a '98 GLT), dropped it in for the spec BOSCH 460 in my '98 V70 AWD, and zoom, zoom, zoom, off I went. Took some baseline engine readings using my OBD-II tool before making the swap and again today after driving roughly 1000 miles with the new ECU. Can't see any material differences at idle and the car isn't throwing any codes now. Looks like a seamless swap can be done between the 458 and 460. Passed our local emissions test too.

As a sidenote, I don't have any exact specs on the GIAC chip solution but it makes a significant difference above about 3K (obviously turbo dependent). Hasn't turned my AWD into a R-spec car by any means but, to my taste, this is how the car should have driven from the factory.

Cheers all!