I've been following along in the IS-F forum, and MHP (Modern Horse Power) claims that he can provide ECU upgrades to provide better performance for our 3rd gen GS (including hybrids). In fact, he is in the process of providing a free ECU upgrade to an IS-F CL member here to prove that his tuning abilities are legit.

Anyone here interested in doing an ECU upgrade for their 3rd gen GS? This would be the first HP mod that I know about that doesn't involve custom turbo, supercharger, or NOS.

Discuss!

Edit: here's the link to the IS-F thread: https://www.clublexus.com/forums/sho...d.php?t=393424

To bypass all the random talking and get to the cole notes version, please see post #129, 152, 154, and 159.

 

i read that thread on and off (not about the contend though, other matters). so when is the is-f ecu testing done? what's the estimated hp gain on the is-f? what does it control, throttle? timing? on other lexus i guess it's more of a ratio power increase, if anything? is it plug and play or need soldering?

i am sure a lot of people will want to know the answers to these too so might as well throw it out

 

those are good questions, and hopefully MHP will come on here soon to answer those questions.

but i will answer what i believe is correct (MHP to correct me if i'm wrong):
- it is a reflash of your ECU, based on MHP specifications. because you are using your own ECU, it is definitely plug and play (no soldering required)
- IS-F ECU testing will begin shortly. IS-F CL member is currently getting stock dyno # and track # as baseline. once that is done, his ECU will be shipped to MHP for ECU reflash. this will take up to 5-7 business days to complete the reflash?
- once completed, IS-F CL member to reinstall ECU, and do dyno and track comparisons.
- my guess is we'll know the final results of the IS-F test by end of Dec at the latest
- other questions needs to be answered by MHP

 

Members, I'm going to ask that we confine the MHP discussion to that one single thread until he becomes a Club Lexus approved vendor.

 

Thx Dave for unlocking this thread (MHP is now an approved CL sponsor).

Now back to the discussion! Your thoughts on doing the ECU upgrade for the 3rd gen GS? Discuss!

 

Thanks guys. We're looking forward to Juan posting his IS-F results next week and in the meantime will be more than glad to answer any questions you may have regarding tuning of the GS platforms. Yes, we can do them right now.

Thanks
Andy

 

so who will be the first to do so?

 

after the is-f testing are done, can we have a good estimate of the power gain on the gs350?

and with all the pros, what are the potential cons? more stress on certain parts? rougher shifting?

 

yah, i'd like to know what kind of gains too. it's an exciting time for us, there is now a power mod that is available for the 3GS

 

I am down if they can post some legit dynographs. Thanks

 

This sounds very interesting I will be down for this mod as well.....

 

I've read the IS-F guinea pig's comments (Juanca) after installing the retuned ECU. In short, shifts are smoother, and there IS a difference in power. How much gain, only a dyno will tell. He has stated that he needs better tires because he's losing traction!

It's starting to look really good folks, I think Passnu ? has already submitted to be the GS guinea pig?

 

I cant wait for this

 

can't wait to see your results!

 

I did its up to Andy at this point, regardless I cant wait to see how the GS responds to this