hi people i have had a rebuilt sti engine fitted into my95 wrx jdm turbo subaru.
during the build a mistake was made which cause me to fry my simtek ecu so i sent it of to Steve Simpson for him to check it out and it was completly fryed,so im having to buy a new simtek ecu.so i spoke to Steve Simpson about it and told him that the car has not been started on the new engine yet but he has told me that he will fit the ecu start it do the running in on the dyno and then once done map it for me.has anybody else done the running in on the dyno. i dont doubt steve simpson as i no he knows what he is talking about but i have just never had it done so thought i would ask for you opinion,he said the car will take roughly 3 hours to complete from when i drop it of.thats running in and full map...

 

in my opinion u cant run a car in just 3 hours,a car to be run in properly takes 1000s miles. not 3 hrs and maybe ahieve 300 miles on a engine on a rolling road,this is the first time i herd of this bieng done..i dont really no this guy so im not putting any one down,but when had a engine rebuilt i had to run it in easy over a course of 3000 miles.

 

ok what the engine had was stripped,acid cleaned,new big end and main bearing,crank checked,all new seals,rc motorsport pump,new head gaskets,super cleaned sti pistons ect,fully rebuilt cylinder heads,valves relapped and pressure tested,new cambelt ect.now im sure most of you know steve simpson was the guy behind simtek ecu i was given his number by jolly green monster,when i spoke to steve he i did tell him it would need running in he said he could do it on the rollers and would take around a hour to run and bed everything in plus im guessing a few hours of final mapping its not that i dont trust the guy as im sure without a doubt he knows what he is talking about but i thought i would ask on here the car was due in on the 18th

 

Anybody

 

Yes it can be done on the dyno, as you can vary the load on the engine allowing the piston rings to seal properly and as long he warranties his work cant see it being an issue.

 

ok considering u didnt have the crank replaced it should be ok to do it on the rollers then.i thought u had a full rebuild including crankshaft.

 

We use a run-in sequence approved by Prodrive and other leading engine builders.This involves running the engine at specific torque loadings for set times to ensure the rings "bed in" to the bores without creating hot spots.Because you can hold the engine rpm on the dyno and "load up" the engine to whatever torque required you can do the equivalent of hundreds of miles of "road running" in a far shorter time.

We always use this method and have stripped engines down and have seen no evidence of glazed bores etc.However on engines that have been "run in" on the road we often see poor ring to bore condition as the owner has driven the car too gently for hundreds (or thousands!!) of miles and not effectively achieved a good ring to bore seal.

Steve

 

I was just in the middle of posting something along the lines of the above! Specific loadings and controlled conditions will always allow the engine to be run in in exactly the manor that it needs to be. Prodrive, M-Sport, Teg sport (where Steve is based) all run in engines on dynos to exactly the same effect!

Graham

 

so anyone who buys a new car and is told to keep car below a certain rpm and dont take it above a certain mph obvoiusly aint doing there cars any favours then and onl y causing long term damage.as u have said u have the right conditions to see that the engine is settled in properly and not creating hot spots.