Stock Rb20det Turbo

[LO_R33]

Hi Fellas

Im actually posting on my brothers account as I dont have one on the SAU forums

Im using an rb20det turbo (16v-10) on my Honda Civic VTiR, but it just isnt making any sort of decent power like it should. Basically on 10psi on my engine I should be ripping through the stock clutch and spinning tyres easily..

This is all based on a mates turbo civic which made only 130kw at the wheels, using a TD04, so it seems i am making significantly less then what i should (170atw for reference)

Does anyone have any information on the size of this turbo? Some people have said its a .48 ar, but it looks quite small. Ive been told these turbos support 180rwkw on the skyline engines, whether thats going to relate to my dohc vtec engine i doubt it, as it is different to your nissan engines.

The turbo does hold boost all the way to redline, which is 8200rpm, so there is no problem there.

Any information about the turbo would be great!

Regards,

Ben

[benl1981]

Civics are a 1.6L aren't they?

Should be big enough for your application. Does it lag much?

I would expect you would make about 130rwkw. I think guys get up to about 170rwkw out of them but this is on a 2L 6 cylinder engine.

[LO_R33]

Yeah its a 1.6

Full boost by about 3400rpm, it starts to spool at about 2900 or so

[StockyMcStock]

i'd say it's sized pretty well indeed.

your lack of power comes from your lack of capacity. are all the supporting mods there?

[LO_R33]

I dont want to cause a shiit here but, the lack of capacity has nothing to do with it.

On the 1.6 DOHC VTEC engine its well known that to achieve 170-180kw atw is attainable. That is however is most cases using a T3/T4 57trim .63ar turbo

Does anyone know the size of the nissan 16v-10?

[benl1981]

I wouldn't go bigger turbo to achieve a 170kw power figure as you may be disappointed with the power delivery. You may get 170atw but in will be all or nothing.

As for yours not feeling quick I would get in on the dyno - check the timing, Air fuel ratios and boost levels.

There could be other things holding it back. I have a TD04L at home off a rex that I was going to turbo a corolla with. I think the RB20 turbo is a little bigger - not sure on specifics though.

Are you running standard internals? What engine management?

Any more than 130-140atwkw would be a waste. Ive been in a astra turbo that has 170kw (probably about 120-130atw) at the flywheel and any more in a front wheel drive would be silly.

You'll be fiighting wheelspin and torque steer

Edited December 9, 2005 by benl1981

[Cubes]

Depending on the dyno the rb20t turbo's do make ~170rwkw with around 14psi, exhaust, fmic and tuned ecu on a RB20DET.

I've ran a rb20det turbo on my rb30det that runs the better flowing rb25 head, that requires only 9psi with the same above mods to make 176rwkw.

So... If the head isn't breathing well in a forced induction application then your going to have to push more boost in to it to bring the airflow up.

That turbo appears to be spooling well. On the RB20DET I used to see ~11psi by a shade over 3000rpm and 1bar by ~3500rpm under normal driving conditions. Load it up in 4th and 1bar would be seen at approx 2800rpm. I never saw boost at those rpms on the road as I would always drop it back a gear.

You haven't actually said how much yours is making?!?

Edited December 9, 2005 by Cubes

[dori34]

try a t28 turbo instead or even better get your hands on a t28bb

[benl1981]

He obviously has a manifold and dump to suit this turbo - I would get things checked out first

[Kaido_RR]

maybe try an rb25 turbo, as its alittle bit bigger, and would surly bolt up to ur current setup as its the same flange as the rb20 turbo

[Cubes]

No need. Simply push more boost in to it.

RB25 turbo is only going to make it come on smoother and have less mid range.

Remember it is a little 1.6ltr, where it spools at the moment looks to be quite a nice streetable package that simply needs more boost.

Edited December 10, 2005 by Cubes

[Kaido_RR]

No need. Simply push more boost in to it.

RB25 turbo is only going to make it come on smoother and have less mid range.

Remember it is a little 1.6ltr, where it spools at the moment looks to be quite a nice streetable package that simply needs more boost.

<{POST_SNAPBACK}>

wouldnt it depend on if the engine is stock or not? Wouldnt it be safer to run a bigger turbo with less boost, than a smaller turbo with more boost.

I may be wrong, i am most of the time

-Michael

[Cubes]

Wouldnt it be safer to run a bigger turbo with less boost, than a smaller turbo with more boost.

<{POST_SNAPBACK}>

Thats always the case but it doesn't mean I'm going to run a GT42 as it may do 300rwkw on 10psi vs the GT30 running 20psi.

I know which will accelerate faster and be much nicer to drive due to a higher average power.

Which does raise another issue. Whats the static comp? This will influence the amount of boost he is able to run.

[MattSR]

B16a's arent a little 1.6 litre.

you are forgetting that the high VTEC cam is some 290 degrees in duration - and you need a decent trubo to match this. A workshop in sydney that did turbo B16's used HKS 2835 turbos on their low and turbo kits, no lag, msooth power and made 230kw at the tyres...

Just somehting to think about.

[MattSR]

Check here for more info and some reccomendations on turbo Hondas. Adrian from TODA racing wrote that atricle, hes a very knowledgable guy when it comes to these little beasts.

[MattSR]

http://www.hondatech.com.au/forum/showthre...p?p=322#post322

oops, forgot link

[LO_R33]

Its his brother posting again here, his external wastegate opens at 10.7psi, so thats how much psi he is putting through the turbo - and your correct it is a t3 flange.

His current rb20det turbo is slowly dying, as the seals in it have just gone.

I will let him know MattSR your advice, though i think all he was really after was the 'specs' on the turbo.. as ozhonda, and more specifically an american honda website that specialises in turboing these engines has given him some ideas as to why he isnt hitting high powerfigures.

Keep the ideas and feedback comming, does anyone know the specific size of it .xx?

Dayne

[Cubes]

MattSR,

I don't believe no lag, every thing has lag.

There's only one solution for turbo and no lag. Displacement.

Edited December 10, 2005 by Cubes

[MattSR]

Hi Cubes,

Totally agree there - I guess I was being a little over enthusiastic with my reply. It did have lag (as most engines with any decent turbo do) What I was trying to say was that the power delivery was really very linear, it slowly built boost from low RPM and was quite pleasant in its delivery.

Cheers,

Matt