IA Stage III+ for 1991 200q20v reviewgreenspun.com : LUSENET : Chip upgrades for Motronic 20-valve 5-cylinders : One Thread
I recently had my F/TCU upgraded by IA to their Stage III+ mod and am VERY happy with the mod.
It is sweet!
It runs 21.5-22 PSI and under heavy engine loading like hill-climbing or trailer-pulling can hit 24 PSI. A 250 kPa transducer is employed. Claimed HP ~277, could go >280 with fuel of sufficient quality. Very drivable, throttle-response is superb and power delivery is very smooth. Stage III+ is $695.00US.
24 PSI is not efficient with the small K24 turbo turbo. Prolly results in excessive heating of the inlet charge and a bigger IC might be a good idea if pulling trailers/big mountains under continuous max boost and slow speeds with low airflow rate through the IC.
I have observed better fuel economy with the III+ mod Vs stock when driving sanely (hard to do now!), like 1-3 MsPG increase, due to additional timing advance at vacuum/low boost levels.
No problems observed with audible detonation running 93 and also no audible detonation running gut-rot 87 for economical long commuting purposes what with 93 approaching $2.00US/gal. I am VERY careful to keep out of high-boost situations running the 87.....
Datapoint: this engine has >165,000 miles on it and is otherwise 100% stock as delivered and burns no oil.
I expect to publish accurate before and after 1/4 mile times from New England Dragway, just as soon as I get a chance to get up there again for the 'after' data.
Anyone interested in a Wed night trip to Epping NH sometime in the next few weeks/months?
-- Glen Powell (firstname.lastname@example.org), July 24, 2000