C34 25det neo

[Jarrod rb25det]

Hey I've got a s2 c34 with rb25det neo after I installed a highflowed 25det turbo the car hesitates for a second between gears when coming off boost then back on throttle. I was running a frontmount no problems with the stock turbo and I've jst installed the sidemount and now it's fine again with the frontmount and highflowed turbo is the afm not coping with the extra air flow or what I'm stummped

Edited March 23, 2022 by Jarrod rb25det

[GTSBoy]

You doing this on the stock ECU?

Don't.

[Jarrod rb25det]

Yea stock ecu only on low boost I have a afr gauge to make sure afrs are good i have link g4x but havnt been able to get it tuned

[GTSBoy]

Any larger turbo worth using will flow more at at "low boost" than the stock turbo does wound all the way up to "turbine flies off". You can't really go past the airflow available from the stock turbo at 10 psi without the stock ECU starting to get upset, and at 11-12 psi it will really be pissed off. I wouldn't contemplate a highflow on a stock ECU without Nistuning it to get around all that.

[Jarrod rb25det]

Like I said I have a link g4x but havnt been able to tune it that's not my question anyway I'm jst cruising until it gets tuned but with the frontmount it buzzes out and the sidemount it doesn't that's my question 

[BK]

On 24/03/2022 at 12:24 PM, Jarrod rb25det said:

Like I said I have a link g4x but havnt been able to tune it that's not my question anyway I'm jst cruising until it gets tuned but with the frontmount it buzzes out and the sidemount it doesn't that's my question 

I think you've just demonstrated how shit your side mount intercooler actually is in pressure drop and flow across its core compared to your front mount.

[GTSBoy]

I took the intercooler part of the question to be a distraction, but Ben is almost certainly on the money.

[robbo_rb180]

go back to the front mount, install the Link and road tune the low load stuff, plenty of people can help like myself or @Dose Pipe Sutututu
Depends where you live an experienced member may be able to help with the install & setup

 

[Dose Pipe Sutututu]

My advice is, install your FMIC, drop off your car & ECU to your closest tuner.

Wait a few days, go pay and collect car and enjoy.

[Jarrod rb25det]

I've now installed the link g4x calibrated everything set base timing and finally got it running afrs are rich on idle but fine cruising but ran out of daylight so will have to tidy things up tomorrow 

 

[Duncan]

good call, much better fixing the cause than chasing symptoms

[robbo_rb180]

On 3/25/2022 at 4:54 PM, Jarrod rb25det said:

I've now installed the link g4x calibrated everything set base timing and finally got it running afrs are rich on idle but fine cruising but ran out of daylight so will have to tidy things up tomorrow 

 

Good work
Easy to trim fuel, build a Lambda/afr target map and can use the quick tune function to get it pretty good quickly but need to turn off any other trim tables.

[Jarrod rb25det]

I have set up quick tune what settings would u recommend I have it set to 1 sec in the cell and 10% and I've only managed to get 4 or 5 cells in the afr target

Edited March 28, 2022 by Jarrod rb25det