Updates.
Steady drive down to EfiParts for mapping on Sat. Quick catch up with Chris and the meg was straight on the dyno.
Strapped on and ready to go.
As i said in earlier posts, this had been mapped years ago by another tuner. Ive said previously that it did not really feel that good..seemed to go ok ish but was skeptical of the 325hp printout on stock turbo.
Had a couple of runs to see power on the original map. Suprisingly it made 311/361 on 2nd run but not the 325hp it had on the printout, which was ambitious for stock tuned engine with a couple of bolt ons.
As you can see the torque comes in hard and fast for a stock engine, and a bit too much boost pressure with 24psi in the mid range. It was also pulling a couple of degrees ignition timing in the mid range so not great overall. Other issues noted were no boost requested low down for some reason, then all the boost ramping in with throttle closing to try and reign it back in on spool, and 25psi requested all the way until 6000rpm. With it not being possible to make 25psi on a stock 15t turbo at 6000rpm, this made the ecu wind up the duty/pid right up on the closed loop boost control. Ecu does not like this and can cause drivability issues.
With it making 311hp, it was unlikely that it would make any more peak hp, but for engine longivity the torque needed smoothing/reducing as 350ft/lb is about max for stock 250 conrods. Last thing we wanted was a rod to exit the block on this.
Chris got to work and started from fresh with a new basemap. After a load of runs fine tuning it to get everything as good as expected it finished up at 311hp/348ft/lb.
Before lines in red, black lines for current map.All the boost in the mid range originally.
One of many dyno pulls.
Its now safer, and much better response low down in the rpm range. It felt very hit and miss on the old map depending what rpm you hit the throttle. It feels the same each time you hit the throttle now and the exhaust note sounds totally different low down. Also launch control activated in 1st gear.
As usual great job from Chris. Drives much better overall.
Also whilst in the area popped by a local place for a quick pic. Im sure a few of you oldskoolers will recognise it from an early 2000's sitcom.
The Archer.
Thanks for reading!!