GS300 Remap

chris_abr · April 14, 2016

Hi everyone,

So I just bought a GS300. Having owned an IS220D, and remaped it a few months ago, I asked 'my friendly tunner' whether he's able to do a GS300 - he says yes. Apparently the ECU hack they discovered back at the end of last year works for IS and the GS (possibly more models too).

So my question is - has anybody done it yet?

The guy says I'll only get around 20-30 bhp extra, but that the shape of the dyno curve should change considerably, making more power at the low end, which is the one you really feel.

Just thought I'd ask someone who did it prior, before spending £250!

Chris

Zotto · April 15, 2016

Don't expect results like in a diesel car, in a aspirated gasoline engine you will get few HPs, even if probably you will have a better response on pedal.

chris_abr · April 15, 2016

That's what I' expecting. Max bhp of + 10% is not likely to be that noticeable, but if the whole power graph went up by 10%, then that'd definitely be noticeable.

Whenever I remapped the 220D, I got around +30/+40bhp at the top end, but the whole curve improved - turbo lag disappeared, and power started at around 2.3-2.4k rpm instead of 2.5-2.6 as previously.

It just made the whole car a lot more powerful overall. Here's the graph from a 220D. It was a big improvement. The 0-60 jumped from around 9s to about 7.5s or so. If I can get the GS300 to 6s from 7, that'd be a massive improvement.

mattmanic · April 26, 2016

What ECU hack is this? Everything I'd read pointed towards an aftermarket ecu being required for any major tuning as the oem ecu is completely locked down

ColinBarber · April 26, 2016

You would be very unlikely to get a noticeable improvement on a non-turbo Toyota engine. Maybe a 5 to 10% improvement which would be hard to notice.

chris_abr · May 13, 2016

On 4/26/2016 at 10:33 PM, mattmanic said:

What ECU hack is this? Everything I'd read pointed towards an aftermarket ecu being required for any major tuning as the oem ecu is completely locked down

The ECU has been cracked around the end of last year. The IS, GS, and a few other models.

On 4/26/2016 at 11:59 PM, ColinBarber said:

You would be very unlikely to get a noticeable improvement on a non-turbo Toyota engine. Maybe a 5 to 10% improvement which would be hard to notice.

I appreciate it'll only be 5-10%, but with a modified exhaust and intake, it should bring it up to 15% or so. At that point, you're talking about getting it up from 245 to 281, then make an allowance within the map for a more dense fuel (GS doesn't require, and make use of premium fuel as stock), and you'll be pushing it close to 300. Which is definitely not in-significant.