
Originally Posted by
U2SLO
Lets look at what happened to this S4 with tune,Mazda speed was glued to his bumper.It's clear to me that he was running an upgraded turbo,and it's cheap to do on that car.The bolt on turbo kits available are less than what we pay for a exhaust on the S4.I paid 6000.00 for intake headers and exhaust installed on my 13' S4.For 6 grand in a Mazda speed he easily hitting 400 whp.It dosent't take much to make power in those cars.They remind me of the gazillions of bosted hatches that were running up and down the strip walking Zo6's from a roll.Coming home from Waterfest I got walked badly by some old Eclipse with an external wastegate on the NJ Turnpike. I pulled up next to him in the middle lane after he slowed and I gave him the thumb's up!,His window came down he screamed out do i wanna trade cars and laughed.
I don't disagree that the mazda wasn't heavily modded....i just don't consider a turbo upgrade to be a "bolt on" even though it does bolt on and only cost $2k. the most power i have seen in a while on a stock turbo with a custom tune (not simply a ecu flash, but mapping, etc.) is in the 295'ish whp. of course there are upgrade turbo kits that will give 400 whp, i wasn't referring to them when i responded to your post as you only mentioned intercooler and good tune. so 375-400 whp isn't possible with the stock turbo.
s4 weighs ~3750 lbs and is ~375 whp with a tune (i think that's fair given the tuner dynos). So that's 10 lb/whp. the mazda is 3250 lbs, so using that same 10 lb/whp, it would have to be 3250/10 = 325 whp to be equivalent. using 15 % dt loss, 325 whp = 382 crank hp or about 120 more than stock....so its clear to me that if he were keeping up with the s4, he would have to have an upgraded turbo as you mentioned.
OP, don't sweat it as others have mentioned. i remember about a year ago, i got pulled on by a 2000 camaro (i'm assuming it was an LS motor) in my e46 m3 with intake, full exhaust and tune. his car was a POS too...but he got me by about 2 car lengths from 70-130. THAT was humiliating. his car couldn't have been worth more than $5k....i sold the M3 for $35k. who's laughing now ;)
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