suby hotrod motors, Probably cost equal to a really good porsche 6 Options

[charliew]

http://forums.nasioc.com/forums/showthread.php?t=1699103

These motors are probably 15-20k once they reach the track. Just a offhand guess. As my son has spent 13k on a street motor with no tranny mods. Just motor, ported heads, bigger cams, 100mm bore, open source tuning with datalogging and utec piggyback, bigger injectors, bigger fuel pump, bigger oil pump, front mount ic, 8qt oil pan, true cold air intake and a 30r rotated turbo at 26 psi. Conservative tune about 425awhp. Also no water or alcohol injection yet.

[charliew]

I have seen a custom itb setup on a suby but it was also a turbo. The 02 up wrx and sti uses a tumble generator valve that looks sorta like a itb but it's a butterfly valve that is controled by the ecu with motors and feedback to increase the velocity in the intake path at low rpm. The tgv is one of the first things that everyone guts to give more flow. They remove the butterflies and shaft and weld up the holes. The tgv is only on us domestic market motors. The jdm stuff just uses a solid casting intake that doesn't have the tgvs. The tgvs set on the heads before the intake. The uneducated would think they were looking at itbs if the upper intake manifold is off.
One other nasioc technique is to use a late 2.5 na intake as it has a bigger plenum to hold more reserve pressure to help on the top end performance.

It really takes about 10k on top of the 2000.00 to 3000.00 shortblock with forged internals (a sti stock shortblock has cast pistons good for about 20 psi until you get bad gas) to make 500 awd hp on a usually overbored 2.5 suby.
cams 1000.00 4 of course
heads with bigger valves and ported 3000.00 maybe including cams for the non cosworth variety
1500.00 standalone ecu, usually speed density no maf just 3 bar map
bigger injectors 850.00
bigger fuel supply 300.00
water/ alcohol injection 800.00
good header, uppipe, down pipe, wastegate, 3 or 4 inch exhaust at least 1000.00 less on the 914 ebay headers are about 240.00
good clutch, flywheel 600.00
bigger oil pan for reliability 400.00 to 600.00
bigger turbo to provide about 30 psi 3500.00

There is no way without juice you can make 500 awd hp with the sti turbo and some magic tuning and if somehow you did it would be so on the edge the first bad gas you bought would do the stock cast pistons in.

Really though as wrx914 said a good 300 hp that doesn't need to be worked on once a month is all most people need to have lots of fun. UNTIL the zo6 comes up in the rearview mirror, then you remember back when it was a type 4. Beep Beep