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Due to stupid lambdas and closed loop system guy at our company recommend me to bore a whole and insert temperature probe which can read up to1000C degrees therefore if the exhaust gasses would run to hot that would mean that mixture is too lean therefore more gas is needed probe cost and reader cost up to 20$. I am doing swap in following days and will report on that.
3GRFSE has different MAF sensor and housing same amount of pins but different connector so the from 4grfse will not do the job unless you want to resolder that...
Some pictures from SWAP and comparison different pinouts 3GR-FSE different pintous 4GR-FSE 4GRFSE different pinouts 3GRFSE GS300 4GRFSE IS250 3GRFSE different pinouts
The car runs I have to check out how stable though there was a problem with MAF basically flying loose and motor dying on me on first start up I bought original gs300 housing hopefully will sort out the issue...
So I want you to update on the swap.
If youre swapping 3GRFSE to Manual IS250 you have to hardwire rear light trigger from old gearbox directly to ECU since connectors are not compatible with manual gearbox they fit to automatic and rearlight trigger is built in.
Big update on AFR:
After first run 10 min or so spark plugs are white which means that engine is not getting enough fuel. I do not know how long you all ran that setup but I would guess it must have failed pretty soon since it seems that fuel maps is different significantly.
Best idea is to run temperature probe on exhaust manifold or swap temporarily Lambda for BOSCH LSU 4.9 with controller to check how rich is the mixture.
Intake ducting/Intake.
They are not compatible. GS300 Airbox is different with different fitting for MAF sensor. I am about to get whole airbox from GS and I will see what can be build together to bypass this problem.
Noone seems to mention this but pretty important. I discourage you from running aftermarket bullpile alu intakes since they mess with AFR readings significantly potentially ruining readings for ecu even further...
Manual and ecu is 4GR-FSE
it throws no error on startup though.
I will update on values during Neutral running hopefuly.
Currently stuck at idling @2k rpm. We had to replace airbox because we could not position maf in middle causing engine to dieoff. We cut off additional plastic so currently there is no intake on radiator. Both intakes are different. Airboxes are not swappable and I m wondering how other people sorted this out. Gs300 airbox is in and holding on one screw. I am also wondering if swapping just injector ecu won't do the trick.
All these questions about pinouts and wiring reverse sensor...
would the 4gr-3gr conversion not be a straight forward swap just swap the harness from the 4gr-fse to the 3gr-fse and use the stock 4gr ecu? Looking into doing this on a 2007 6 speed is250
are they actually running lean or is it an isolated issue with one swap?
Hi DulceSeek, was just wondering if you solved the leaning out issue? did you get the car tuned?
Hi, I gave it to a guy who does ECU programming he basically just uploaded maps from GS300 (3GR-FSE) to be on safe side. Nothing more was done in this regard.
Hi, I gave it to a guy who does ECU programming he basically just uploaded maps from GS300 (3GR-FSE) to be on safe side. Nothing more was done in this regard.
I see. I presume the extra 40 hp makes the world of difference to the car
I see. I presume the extra 40 hp makes the world of difference to the car
not at all. It is engagement of the VVTI which comes at 3.3k RPM instead of 5-6K by 4GRFSE that is hell of a difference. Gearing is quite conservative so next step is Y58 Diff
not at all. It is engagement of the VVTI which comes at 3.3k RPM instead of 5-6K by 4GRFSE that is hell of a difference. Gearing is quite conservative so next step is Y58 Diff
oh yes, the 4GR has a nice oomph when it hits 5k rpm. Below that abit of a sluggard.
05-19-20, 01:42 PM
Exhaust temperature
