Rb30det, Tune On Stock Rb20 Turbo

[R31Nismoid]

with a GT35 aim for 330-350rwkw

And stock RB20 turb pumping 11 then 9psi into a 3ltr... wowzers!

give it a bit of shit joel and see how long the turbo will last.

[Bl4cK32]

I've got a little vid of one of the dyno runs.

Not too much. I was more so watching any tell tale signs of detonation.

Clicky (~1.7mb)

LOL well done Spielberg with the vid......:aroused:

[Cubes]

Limited space in the dyno room. Mr. Darren.

At the time of taking the vid I was actually watching for any little bits of detonation. Little white puff of smoke.

[dangerous_daveo]

So out of interest... What is the fuel economy like???

[Cubes]

Unlike the rb20det it makes a difference if I boost it around everywhere.

The RB20DET would always get 470km's to a tank of juice.

The RB30DET if heavy with the foot will get a minimum of 430 and a best of 520 with a light cruising foot.

[2fardown]

Nice video Joel.... Your wheel spinning around.

Following your progress with this has me seriously thinking about buying an R32 and starting work.

[Cubes]

lol... There was bugger all room in the dyno room. It was either the passenger door, the front guard or the rear wheel.

[riceline]

Nice result there Joel!

Can't wait to get the last few parts to go onto my RB31. Then I can get it all tuned!

Just have to get the turbo highflowed (RB25 S2 turbo) and decide on what injectors I want to go. Not sure if I want 550's or 600's. They are both the same cost.

[carl h]

wow that poor rb20 turbo is screaming......

[Skyrine-Dave]

this was my engine bay as of sat 9/4/05

looking to start it this weekend if all goes to plan

[yogi000]

i like the 3000 on the top of the motor.....attention to detail hehehe

[Cubes]

Looks very nice Dave.

[dangerous_daveo]

Unlike the rb20det it makes a difference if I boost it around everywhere.

 

The RB20DET would always get 470km's to a tank of juice.

 

The RB30DET if heavy with the foot will get a minimum of 430 and a best of 520 with a light cruising foot.

Thats not too bad hey. I guess also with still running the rb20 turbo its on boost 90% of the time.

Im getting about 570kms to the tank atm, so I guess if I did it with my pansyarse driving I should get 500kms a tank easy. Its fair for a ballistic motor

[Wazz]

Unlike the rb20det it makes a difference if I boost it around everywhere.

 

The RB20DET would always get 470km's to a tank of juice.

 

The RB30DET if heavy with the foot will get a minimum of 430 and a best of 520 with a light cruising foot.

must be a rb20 thing.. i put my foot down everywere always get around 400 to a full tank 300 by 1/4 left.. no matter how i drive weather its like i stole it or miss daisy but meh hopefully a rb30det will be in my engine bay by the end of the year.. (if i get my act together n start working again)

nice results tho

[INASNT]

Unlike the rb20det it makes a difference if I boost it around everywhere.

 

The RB20DET would always get 470km's to a tank of juice.

 

The RB30DET if heavy with the foot will get a minimum of 430 and a best of 520 with a light cruising foot.

Nice work cubes.

I thought u would have budgeted to get the big snail on there so it could have all gone on their at once.

I dont know how you are getting such good fuel economy there, I am lucky to get anything over 300km to a full tank driving like a granny to work everyday

[Cubes]

Yer not sure on the fuel economy, A couple of things I can think of?!?

Accelerating around slowly and boost starts to build I lick the throttle back a little to let the BOV bleed the boost.

RB20 general driving I used to change up at around 3000rpm.

RB30, I change up just over 2000rpm, some times i throw it in a high gear and let the torque lug slowly to the speed limit.

What injectors are you running?

Spray patterns and good atomisation make a noticable difference to economy.

[INASNT]

550cc sards.

I need to adjust fuel maps for part throttle applications as my tune is basically at 100% throttle

[Cubes]

Lag time correct? This apparently has an affect one how well the O2 sensor controls the afr's in closed loop mode.

[INASNT]

Lag time correct? This apparently has an affect one how well the O2 sensor controls the afr's in closed loop mode.

Havent really played with the injector setting much.

Where is lag time correction in the pfc?

[Cubes]

Inasnt,

Its some where in the Settings Inj menu. The ms. Unsure if it states injector correction or not.

Out of curiosity I've done a few little calcs.

After looking at the peak power it really is approx 175rwkw which was made from approx 4500rpm to 4950rpm.

The 176rwkw was simply a little peak in the graph, I don't consider it a power figure. If that makes sense.

So lets say 4500rpm is where the peak power was made.

RB30DET - 4500rpm to 4950rpm

flows the same air as an

RB20DET - 6775rpm to 7400rpm

My old RB20DET made its peak power figure of 164rwkw (stock ecu but) on 1bar of boost at 7000rpm. I thought 7000rpm was a little high for a stocker so it may have been a dyno operator error. Rev's flick quickly around that point so it may have been 6800rpm or even 6500rpm (more likely)

Either way it gives a general idea on the engine airflow differences between the two motors.

No wonder the turbo drops power after 5000rpm.

If this turbo was on the rb25det I would expect it to make its peak power between 5425rpm to 5925rpm.

Has any one got a dyno graph of their RB25 on the stock RB25 turbo, where it makes its peak power or if the graph rounds out slightly?

By RB25 factory specs (6200rpm) I would expect peak power on the 3ltr with the rb25 turbo to be around 5150rpm then maybe round off and possibly hold a figure close to that for another 500rpm or maybe hold an average power figure over 500rpm with the 5150rpm being the in the middle of that distribution.

It would be interesting if this theory were to hold true, and if VCT on the RB25 RB25 head actually extends the peak power figure on the 3ltr, hence improving VE a noticable amount in the top end over the RB25DE N/A Cams.