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HKS 2530 on RB25 Wrap Up

Robo's

By Robo's,
in Engines & Forced Induction

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Robo's Mentor

Robo's

Posted
Posted

We have finally finished tuning a 2530 on my RB25. Sorry i dont have true Dyno Dynamics figures yet to compare against my old stock turbo set up as we tuned it on a friends Dyno Max dyno. All what i can say is this has some serious midrange grunt. Enough grunt that 2nd gear roll ons spins the wheels everytime in the dry. 1st gear is pretty useless, you cannot snap second as it will spin to redline, so easing it into 2nd generally does the job. But 3rd and 4th is were it really rocks. 3rd 70kmh, gives you a nice strong shove in the back, 4th 100kmh, just as strong. Initially tuning the Power FC running 15psi, it was the strongest i had felt but after winding the boost to 18.4psi, the extra boost in the mid range makes 15psi seem slow. I think we gained 5rwkw peak with the extra boost but its the midrange that counts. Max power is now at a lowish 5,600rpm. From 5000rpm to 7000rpm its lucky to move 5rwkw. So you can see its a torque monster. From 4,000rpm to 5,000rpm is where it really moves.

Still there is a strong boost drop which suggests the turbo is too small for this motor. Im getting peak boost of 18.4psi at about 4,600rpm which drops off to 13.3psi at 6500rpm. Still its holding boost around 16psi at 5,600rpm. Ive got 16psi at 3,000rpm.

Time for the track, it will certainly beat my 12.98 with the stock turbo and SAFC set up, depending upon my hook up a 12.5 will be easy. Slicks and a low 12 would be easy. Have to start playing with suspension and tyre pressures to get some traction. No traction and i will lucky to beat that time but the mph will be much stronger.

Overall i am very impressed with this setup, to make nearly maximum power at 5000rpm is bloody impressive. Its not going to win a dyno comp, im estimating between 230-235rwkw on a dyno dynamics dyno in shootout mode.

Mods are as follows:

HKS 2530, Z32, Power FC, Exhaust cam gear, custom cold air box, 3 inch dump & cat, splitfire coils.

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ferni Grand Master

ferni

Posted
Posted

Mate put a 2530 on his 33gtst and had the same problem, it flattened out up top end.

He upgraded to a 2535 and found it much more suitable.

Are you running a new actuator? or stock one? He found he needed the actuator upgraded as well.

INASNT Grand Master

INASNT

Posted
Posted
We have finally finished tuning a 2530 on my RB25.  Sorry i dont have true Dyno Dynamics figures yet to compare against my old stock turbo set up as we tuned it on a friends Dyno Max dyno.  All what i can say is this has some serious midrange grunt.  Enough grunt that 2nd gear roll ons spins the wheels everytime in the dry.  1st gear is pretty useless, you cannot snap second as it will spin to redline, so easing it into 2nd generally does the job.  But 3rd and 4th is were it really rocks.  3rd 70kmh, gives you a nice strong shove in the back, 4th 100kmh, just as strong.  Initially tuning the Power FC running 15psi, it was the strongest i had felt but after winding the boost to 18.4psi, the extra boost in the mid range makes 15psi seem slow.  I think we gained 5rwkw peak with the extra boost but its the midrange that counts.  Max power is now at a lowish 5,600rpm.  From 5000rpm to 7000rpm its lucky to move 5rwkw.  So you can see its a torque monster.  From 4,000rpm to 5,000rpm is where it really moves.  

Still there is a strong boost drop which suggests the turbo is too small for this motor.  Im getting peak boost of 18.4psi at about 4,600rpm which drops off to 13.3psi at 6500rpm.  Still its holding boost around 16psi at 5,600rpm.  Ive got 16psi at 3,000rpm.

Time for the track, it will certainly beat my 12.98 with the stock turbo and SAFC set up, depending upon my hook up a 12.5 will be easy.  Slicks and a low 12 would be easy.  Have to start playing with suspension and tyre pressures to get some traction.  No traction and i will lucky to beat that time but the mph will be much stronger.

Overall i am very impressed with this setup, to make nearly maximum power at 5000rpm is bloody impressive.  Its not going to win a dyno comp, im estimating between 230-235rwkw on a dyno dynamics dyno in shootout mode.  

Mods are as follows:

HKS 2530, Z32, Power FC, Exhaust cam gear, custom cold air box, 3 inch dump & cat, splitfire coils.

Hope to see ya at the next track day to see how she goes.

Only reason i didnt go the 2530/2535 route is because they run out of puff up top and come on boost 2 early causing wheels spin

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