Evo Upgrade Path Warning Options

[Kazz5]

Apparently it's important to replace the stock Evo 8 (not IX) fuel pump with the Walbro 255 if increasing the Evo's boost beyond stock levels (18-19 peak psi).

Al from Dynoflash will not sell you a flash if you're implementing an MBC/EBC unless you have one installed.

*Shrug*

Dunno all the tech details but it's being implied it helps prevent small-percentage of massive engine failures ...

Just an FYI as I got raped for questioning it at EvoM since I'd not heard anything about it yet ...

Thank you, that is all, back to feasting on V-8s...

[akamiami]

I remember when I first joined that site 2 years ago I marveled at how many were recommending rod bolts anytime the rev limit was increased.

The alternative to that are the engine builders who often swear that the rods need to be re-machined when new arp bolts are pressed in as necessary. They claim that when you press in the new bolts properly and fully, the force distorts the 'true round' of the rod end which holds the bearing. I voiced this concern to one of the vendors who was adamant that it was necessary. This was in a thread where the vendor had described literally dropping the oil pan of an evo on the dyno, tapping out the old rod bolts, and torqueing new ones in with no other work performed. I was amazed. The answer I got to my question was that it's a split decision whether the rods really need to be machined or not so they do it and haven't 'seen' a problem yet. I just wonder what the rod bearings look like on those guys' cars 30K later compared to mine which was never f-ed with in the first place.

I'll take my chances on my stock equipment. Plenty of guys have no problem putting power down on a completely stock bottom end for me to ever loose sleep about it. Aftermarket rods, when they are used, typically have the ARP hardware already.

I think rod bolts falls into the 'if it isn't broke don't fix it' category. Engine rebuild time, no question, go with the good stuff. But, until then, don't lose sleep.