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2510 On Rb20 - Out Of Puff

Chris32

By Chris32,
in Engines & Forced Induction

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Chris32 Veteran

Chris32

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What do you guys reckon

Is my turbo out of puff or something else not right?

AFR's where 11.5 going to 12.1 up top

HKS GT2510 as far as I know

My tuner reckons that about it for that turbo, I agree. I thought about cams, but he said if the turbo is just too small, it will make the problem worse, as the engine will be more efficient, but the turbo won't be able to keep up

Thanks, Chris

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Chris32 Veteran

Chris32

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Yeah, 2510 is the smallest of the HKS range, well it was before they stopped making it!

I want a genuine 220rwkw, as I rekcon that where some good numbers lie both at the drags and around Mallala.

I want a low 13sec car, and something I can lap Mallala in around 1.25

I'd be happy with that. I just want to be able to use the revs, as at the moment it feels like it dies in the ass after about 5500rpm, as you can see on the dyno sheet

What would you want for your turbo? It would be interesting to see what it makes on a RB20!

Bl4cK32 Grand Master

Bl4cK32

Posted
Posted

lol...dunno what its worth, as i bought it with the car when it was freshly highflowed. Its made about 220rwkw with this motor (i reckon it has slightly more due to the air pod shitter im running which will be changed soon)

Ive got pics of the exhaust and compressor side...Shaun and Cubes have seen it too....depends on when i'll be buying the xr6 GT35r for mine as to when ill be taking it off....I'll catch up with you this Sat. at Boostworx and discuss more on it ;)

CEF11E Veteran

CEF11E

Posted
Posted

Chris32

Between 118 and 130kmph your torque band is dead flat but your KW figure goes from 180 to 193. than ofer that it tapers off real quick. so to get the power you want it will need to breethe better up top.

As you are rubnning 1.35 bar the compressor is spinning at its max efficency range at high rpm so the only way to make more power is with better flow.

Considering you prob already have a very free flowing exhaust. 3" turbo back with a good dump pipe and a very high flowing catalitic converter, there are a couple of things you can do.

1. cool the intake charge further. If you dont have one you could make a waterspray kit for your intetrcooler. because at 1.35 bar you can bet your intake temps could benifit from further cooling help. this will make intake air denser, and make more power. on my car it made 13RWKW difference. ;)

2. you also need to make it easier for the turbo to ram that air in!!! ruling out headwork as its too expensive your only other option will be cams.

350nm is very good torque for the ol RB20 and without better flow you won't usually get any more than that.

also your boost curve is fantastic and i bet your car is very fast on the street and thru the windy stuff.

I think if you can get 220rwkw with that turbo you will have a very fast car. but the odds are stacked against you :)

Chris32 Veteran

Chris32

Posted
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Boost does nose over after peak power, down to about 16psi

Exhaust is no restriction, 3.5" dump, no mufflers or cat execpt for the rear can

I think air out is the main issue, exhaust housing causing restriction

Its only rated at 300PS!

Chris32 Veteran

Chris32

Posted
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Getting re-tuned tomorrow, as that tune is quite lean. Going for more timing and fuel. I want to see at least 200rwkw, maybe a bit more if possible

Might try it at 1.2bar and see if that helps with a bit of top end. The mid-range on the road is lots of fun though

Quite a few people keen on my turbo! Lots of PM's!

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