gt28rs or k04???
#81
i do have a quick question.. was going to get some headers for my build.. talked to some people and they have said that ported manifolds make for a faster exhaust velocity then headers do.. so.. what have you found? i can port my own manifolds and be ready to go.. but id rather know which actually performs better.. i dont want to not spend, i want the best outcome for me not building my engine..
Hmm i'm kind of lost as to the overall power of the ko4.
This is what i was thinking:
2004 Audi a6 2.7 s-line.
265 Hp Stock
Giac Chip = 70hp
CAI = 6-8hp
Headers = 8-10hp
High Flow Cat = 3hp
Cat Back Exhaust = 8-10hp
That would give me 365hp total (350hp(5 speed tip) if audi/hoffman can't find me a 6 speed, then i'll of course have to add a Giac or Apr Tip Chip). So i'm confused, if i'll be getting around 365hp shouldn't the KO4 be able to easily push me over 500hp?
This is what i was thinking:
2004 Audi a6 2.7 s-line.
265 Hp Stock
Giac Chip = 70hp
CAI = 6-8hp
Headers = 8-10hp
High Flow Cat = 3hp
Cat Back Exhaust = 8-10hp
That would give me 365hp total (350hp(5 speed tip) if audi/hoffman can't find me a 6 speed, then i'll of course have to add a Giac or Apr Tip Chip). So i'm confused, if i'll be getting around 365hp shouldn't the KO4 be able to easily push me over 500hp?
I've heard of a couple of people that have had issues with the APR bipipe. Some say that they had pinhole sized leaks from the castings and some others had issues where the bipipe meets up with the TB I believe. Tons of others have had no issues. As far as the GENX or now ARD bipipes, they're the biggest you can fit in there (2.25" I believe) and they're just a uniform tube. The stock, RS4 and apr bipipe all change cross-sectional area and shape multiple times throughout their length.
As far as breaking rods, I'd go with a rather conservative tune if I were you and were worried about the engine. It doesn't really seem like you're worried about if/when it goes, so no stress there I guess. People have broken/bent rods with around 500whp (and even less) before, also there's people who are successfully running a little more, so you just need to calculate what you're willing to risk. Axles can break, but I don't don't think you'll need to worry about that at RS6 power levels, and I bet the rods go before the axles.
I personally wouldn't build the heads with RS6's because they'll be perfectly fine with a 7200-7500RPM rev limiter. I built mine because I had to rebuild them anyways because the motor I bought had some bent valves. You can throw rods in and leave everything else stock and go for broke with maxing out the RS6's, it doesn't require built heads etc. And you definitely don't need to replace pistons, unless you want to go bigger displacement (or lower compression ratio and don't want to do a headgasket spacer.)
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