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| Engine Mods |
| A close-up pic of the area where most of the engine mods are. Front of the car is left picture. |
| K&N air filter installed. I used the mounting flange from the original air box and welded a peice of 4 inch pipe (slightly bent for clearances) to it. Note the heat sheild between the filter and engine and the mounting brackets off the MAF sensor. This mod improved throttle responce but added a lot of intake noise. Install a louder stereo (see stereo mods). |
| External Blow Off Valve. I modded the original BOV to vent to atmosphere (cool noise maker). I just sealed up the return port on the intake and added a one way valve (chrome thing) as the BOV valve would open momentarily when the trottle was opened allowing air to be sucked in causing lean-out. Bad. One way valve fixed that. This mod improved turbo spin up times drastically as it couldnt 're-cycle' air in a loop around the turbo, Boost comes on just over 2000rpm now. Plus you get that cool 'phooosh' noise on gear change! The yellow/blue hose top right is the line off to the boost guage in the 'cockpit'. But I have since removed this mod, due to the fact the car would backfire on up shifts, and annoyed my neighbours! |
| Boost adjustment taps. The one on the left is a pressure regulator valve which controls the maximum pressure to the waste-gate which in turn governs maximum boost available for your enjoyment. The right hand tap is a pressure relief valve which wont let any pressure through until the desired pressure is reached. In effect this wont pass pressure to the waste gate preventing waste-gate 'creep' as boost comes on. Set this lower than the pressure adjust valve. My set up is for 14psi boost max, so as boost comes on the pressure releif valve doesnt open until 12psi (no waste-gate creep with increasing boost), once 12psi is reached the relief valve opens porting pressure to the waste gate. As boost keeps rising the pressure regulator comes in to play by regulating the pressure to the waste gate to acheive my 14psi max boost. Get it? Yellow/blue hose with T-union goes to the waste gate, black hose ports back to the inlet (prevents pressure being kept between valves and waste gate, keeping it open), and yellow/blue hose off pressure relief valve goes directly to the pressure outlet port of the turbo. Yellow/blue hose is specialised air line hose, fibre reinforced. But it doesnt like the heat too much (gets soft) so I'm gonna change it for steel reinforced stuff soon. Oh yeah, keep your hose lengths as short as poss (improves reaction times) and ensure your valves are heat resistant. I have since removed this mod, and went and brought a Gizzmo Group N chip instead! But the car actually went better with my mod as above installed! Go figure..... |
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| Group N intake mod. A stainless steel tapered pipe that replaces the plastic noise supression box, improves air flow majorly. Has 2 ports in to it, one for the engine oil breathers and the other off the waste gate (see boost adjustment taps). This mod improved acceleration throughout the range quite noticably :) |
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| Another easy mod. Remove the cool air ducting from under the bonnet scoop. You might have to carefully pull off the bonnet lining to get to the phillips head screws that attach the duct to the inside of your bonnet. Instead of blasting cold air at your turbo, it will blast it over your intercooler as well, keeping it nice and cold! Besides, hot turbo's get better thermalmetric effiicency, so work better! Win win situation here! |