Rb20 With Td06-19c Too Laggy

[sleak]

Hi, I have a silvia with an RB20 in it. it has a TD06-19c and I dont know the exhaust sixe (10cm or 8cm) but it is very laggy and no good for its intended use.

now my options are as I can see them,

1, take the turbo off and look inside the exhaust housing and see if its 8cm or 10 cm, then if 10cm, get an 8cm housing for it and away I go.

2, look into buying a smaller turbo for it, but it has to be externally wastegated as I dont want to modify the already modified custom exhaust manifold. I was looking at things like the 'disco potato', and other gt 28 size turbos but they all seem to be internal wastegated. can anyone sujest a good turbo that gives good power at around 3000rpm. Im not looking for a drag or dyno king car, just something that has some low down torque and still some power behind it. prob around 210rwkw would be good.

or 3 sell the car and get soemthing different! I would prefer not to do this one!

I just dont want to spend a heap of money on it again, but would like to enjoy the car as much as I can.

any ideas from people with experience with low spooling turbos would be awesome.

thanks heaps

Rhys

[Roy]

RB20 is 2L, with 8:1 compression, so no turbo is goign to give you good power at 3,000rpm. Not even the std turbo does that.

So apart from putting an Audi 1.8L turbo on it??? Basically its a 130kg low compression 2L, i dont think it will do what you want from it...sorry

[rb20inside]

roy is right on with that. the standard turbo doesnt give any real power at 3000rpm and you're certainly not goin to get near 210rwkw with something that does.

i'm using a 2530. gets round your mark but full boost(16psi) is round 4000rpm.

i dont know as i've never driven one but i dont think a gt28rs will get "good power" till round the same mark. certainly not on a 2L 6cyl.

[sleak]

ok good advice there guys, thanks. Thats ok that I dont get good power that low then if its not easily done.

so your 25/30 sounds like a nice mid range turbo, but they are internal wastegate arent they. I would prefer not to have to weld up an internal wastegate turbo, so do you know of any turbos that would give good low to mid range power that are external wastegate?

Thanks again.

rhys

[lwboosted]

i have an rb20 with a td05/06 mine was originaly internal gated all u need to do is weld it up.. thats what i did and put the external gate on.. but yeah mine doesnt come on full boost till 4000 rpm as well..

[rb20inside]

td05 may work alright. mate uses a externally gated one on a ca18. its not too laggy, bit under 4000rpm i reckon (3800??).

so this may work alright on a rb20. shouldn't imagine it'd make quite 210rwkw but it'd be responsive. but realistically your not goin to get much "low down torque" from an rb20

in my opinion, 4000rpm isnt really that laggy, depends what your using the car for but you mentioned not drag/dyno. a car will be quicker on the track with more average power (area under the curve on dyno graph) rather than peak power

a slightly laggier turbo is better (in my opinion) for street driving anyway. uses less fuel, more forgiving in the wet, etc.

remember boost is only a clutch kick away