The agenda for the day was:
1. remove standard airbox
2. fit APS 70mm Cold Air Induction Kit
3. adjust maps to compensate for the greater airflow
4. fit front splitter
5. fit 800 cc injectors
6. map again to suit these
Quite a lot
.... so I got there bright and early at 9am armed with some milk and sugar and plenty of smokes ... this was going to be a squeeze to get all of this done in the time available before I needed to be home so Rachel could go out on the razz.Zak set out to work straight away unbolting the standard airbox and trying to thread the needle that is the APS kit into the given hole in the inner wing so that the air intake is isolated away from hot engine temperatures.
This was a bit of a tight fit but Zak and Luke soon had this sussed by moving the ABS unit for a moment just so that they could twist the L shaped pipe into place and bolt it to the inner wing.
While they were busy, I was actually getting my hands dirty too by removing the fixing at the bottom of the bumper and marking holes to drill for the new front lip spoiler (from http://www.ScottLowe.co.uk - thanks Scott :thumb:) Then with more than a little fear I started to drill into the bodywork to allow for the supplied nuts and rubber expander nuts to slot through. Supposedly this is a 10 minute job, which I am sure it would be if the bolt were 1 mm longer. They werent :x
So... a bot of lateral thinking was needed and a piece of gravel
Now armed with a piece of gravel I could fit that into the end of the 8mm socket to enable me to push the bolt up at the same time as twisting ... worked a treat
Within a few minutes the splitter was now in place
At the same time, Zak had finished fitting the induction kit and we were ready to start mapping.
Well almost ready, firstly Zak has to turn the floor of my car into a mass of wiring, cables and det cans.
We even had a little helper trying to assist with bolting the necessary sensors and safety equipment.
Mapping was detailed and very time consuming as when the induction kit is put on (particularly one with a larger than OE diameter) the MAF reading are well out as the air flow is slower for a given voltage and in this case leaned the engine out by the order of around 30% in parts of the map
- just shows how restrictive the std airbox can be at certain power levels.The ECU std map allows for up to 300 grams/sec on my model for a given voltage through the sensor. With painstaking accuracy and attention to detail in ensuring that the curve was smooth and provided the right fuelling all the way up the range, Zak finally got this to scale to around 465 grams/sec - now I just need a turbo capable of pushing that much into the engine....
Previous to today, my injectors was maxxed out at 1.45 bar (see post 1) but now with the increased airflow, they were maxxing out at 1.2 bar and flowing more air than before too. Could this be right - same power less boost ? Doubting it, the maps were done and redone several times to get every last ounce of smoothness to them before calling it a day. We had taken a long time getting these spot on that the 3 hours to change the injectors and remap had been eaten into.
A few more tweaks later we were heading back to Mocom racing for a cup of coffee and to pack up for the day - and to arrange for me to go there again next friday to get the injectors done.
The results were astonishing, we had got the same power as before but with 0.25 bar less boost
This bodes extremely well for when we add the boost back in (and a little more
) next week. Maybe my guess of another 20bhp was a little conservative but whatever 0.25 bar works out to be it will certainly be fun Car got back home after doing a quick dyno run to confirm our thoughts about the power - I havent fully compared the two but this one worked out at 297 whp but with a car full of tool kits and junk. I will do a proper comparison at the weekend without a full car.
....I used to be average, now I reminisce !!!
