gs400kg

Running stock GS400 w/Dual Apexi N1 Exhausts (props to pakiman626, GREAT SELLER) and Rod Millen intake (props to LCSC, another GREAT SELLER)

Not planning any other performance mods, however, should I start looking for the SRT ECU, read some old posts from BananaGS (I think), indicating it worked well with Millen, although not recommended by SRT

Also interested in buying ECU if anyone has one

I am new to Lexus, but this is a killer group w/great info, sellers, and people.

Thanks to all, it is greatly appreciated.

keith

GS300-2002

1. Not sure how well the SRT ecu will work with the millen intake, shouldnt cause any problems but
2. A SAFC will be better because you can adjust it whereas the SRT is not changeable

RUSSOM

iTrader: (4)

Looks like you're in Alabama. If so, put it on a dyno. www.SECdyno.com in Birmingham has the nicest setup around.

GS FONZy

iTrader: (6)

That's actually incorrect and will give a CEL.

DumpedGS

iTrader: (1)

get an Apex-i SAFC and have it installed and street tuned with a wideband o2 sensor. dyno tuning air/fuel ratios is a waste of money since a dyno cannot 100% replicate street driving and load conditions.

RUSSOM

iTrader: (4)

Correct for an inirtia dyne, NOT correct for a load bearing type. The dyno I use for my car is a Mustang brand 1100SE, it uses a magnetic eddy brake to simulate the exact load of the vehicle. It has software that has information dating back to 1973 on vehicle curb weights and coefficient of drag, very important at the speeds a car would see in a 1:1 trans ratio. It doesn't get better than that. The elimination of variables, traffic, tickets, and being able to accurately tune cell by cell can't be matched on the street or track if a correct dyno is used. FWIW, most dynos are inirtia only machines, they are much cheaper and thats why they are so abundant in the market. The further a vehicle weight gets from an inirtia dyne's roller weight the less accurate the testing, thats why I use an eddy brake dyne. Also, the test cell at Southeast Chassis Dyno exchanges the entire volume of air through the test cell over 10x/minute, the wideband is accurate within 1%, the same brand and equipment Nissan and BMW use for their original factory tuning. So for most shops, yes dyno tuning can only be so good, but the facility at SECdyno is the best around at vehicle simulation.

DumpedGS

iTrader: (1)

ive tuned several cars on mustang dyno's and other load bearing dyno's. athough they do simulate load, when others cant...i have still found that they can not simulate real life conditions 100%. a good tuner will still go out and street tune a car after being on the dyno for that very reason. for a/f tuning for a car of our caliber, a dyno is not needed. for a 800hp car, sure a dyno or drag strip is the only option...but thats not the context of this thread.