Jump to content
SAU Community

Recommended Posts

Hey guys,

Are rb20det's really slow or is it just me? I recently got a r32 gts4 converted to RWD,

Stock turbo

Stock airbox

No cat

11psi boost

Stock zorst

At about 2500 it starts getting up to 11psi which holds till about 6000 then trails down to about 9..

My issue is, it only seems to give you that 'turbocharged boost' feeling at about 3-3500 then the rest of the gear feels like a NA despite the bost guage reading 11.

After doing a lot of searching on these forums most people complain about no low end but good top end, where i seem to be the opposite..

I used to have a SR20det silvia which was slow in low revs then kept getting faster as the revs climbed higher which is the feeling i like/expect from a turbo car

Any ideas? I could be paranoid and just have a slow 6 cylinder 20det.

Cheers

Link to comment
https://www.sau.com.au/forums/topic/324324-i-only-have-low-mid-range-power/
Share on other sites

Sounds about right for a stock RB20 turbo.

Source yourself an RB25 turbo (preferably a series 1) and wind it up to 12psi.. you will lose some low down but gain a fair bit in the top end and it will pull all the way to redline.

thats not the feeling i last had from a rb20det with just a catback. as per results last I drove one felt like it had plenty up top and a little lacking down low, the rb25 turbo added to this in both departments.

sounds to me like you are missing your top end action. how long have you owned the car? was it like this from day one?

things to test: fuel reg & fuel pump.

suggested test: crimp the return hose off the reg, see if it does anything. this is to be done for TEST sake only and is TEMPORARY. I wouldnt run the car like that for long.

$10 says its ur reg

thats not the feeling i last had from a rb20det with just a catback. as per results last I drove one felt like it had plenty up top and a little lacking down low, the rb25 turbo added to this in both departments.

sounds to me like you are missing your top end action. how long have you owned the car? was it like this from day one?

things to test: fuel reg & fuel pump.

suggested test: crimp the return hose off the reg, see if it does anything. this is to be done for TEST sake only and is TEMPORARY. I wouldnt run the car like that for long.

$10 says its ur reg

I've had the car about a week so yeah it's always been like this. At first i just assumed the rb20det is slow but after a bit more driving i decided it's definately lacking top end.

In your test you say 'see if it does anything', what should i be looking for here?

Thanks for the replies

thats not the feeling i last had from a rb20det with just a catback. as per results last I drove one felt like it had plenty up top and a little lacking down low, the rb25 turbo added to this in both departments.

sounds to me like you are missing your top end action. how long have you owned the car? was it like this from day one?

things to test: fuel reg & fuel pump.

suggested test: crimp the return hose off the reg, see if it does anything. this is to be done for TEST sake only and is TEMPORARY. I wouldnt run the car like that for long.

$10 says its ur reg

His doesn't even have a catback..

And when my stock fuel pump was dying, it was actually leaning the engine out and making it go harder.

It's been so long since I had an RB20 with a stock turbo so it's hard to remember back that far but, I'm sure it came on a lot earlier than 3500 (that's when the 25 turbo was pulling hard).

His doesn't even have a catback..

And when my stock fuel pump was dying, it was actually leaning the engine out and making it go harder.

It's been so long since I had an RB20 with a stock turbo so it's hard to remember back that far but, I'm sure it came on a lot earlier than 3500 (that's when the 25 turbo was pulling hard).

The pulling feeling in my car is around 3000 im not entirely sure but the point of my post is that that pulling feeling dissappears soon after and the rest of the gear feels like an NA Rb25 if you like.

I'll try the fuel reg thing anyway and let you guys know how it goes tomorrow arvo.

you have a stock exhaust. that will be restricting things in the top end. the cat may also be a bit blocked make it even more sluggish in the top end.

I think he said he doesn't have a cat.

How many km has the engine done? has the timing belt been done? (thinking it may have slipped a tooth or two?)

But yeah, the stock exhaust won't be doing you any favours.. get a full 3" turbo back.

And find someone in your area with another stocker and compare.

Yep i cant do that mate no boost controller, it's boosting at 11psi becuase i have no cat

Doesn't matter if you have a boost controller or not, the stock RB20 actuator is ~10psi, the only way you could go lower is with an R33/34 actuator which is ~5psi but that's just stupid.

My stock ECU handled 14psi with the stock turbo and 12psi with the RB25 turbo.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • The sodium acetate, mixed with citric acid, doesn't actually buffer each other. Interestingly though, if you used Sodium Acetate, and acetic acid, THAT becomes a buffer solution. Additionally, a weak acid that can attack a metal, is still a weak acid that can attack a metal. If you don't neutralise it, and wash it off, it's going to be able to keep attacking. It works the same way when battery acid dries, get that stuff somewhere, and then it gets wet, and off it goes again breaking things down. There's a reason why people prefer a weak acid, and it's because they want TIME to be able to be on their side. IE, DIY guys are happy to leave some mild steel in vinegar for 24 hours to get mill scale off. However, if you want to do it chemically in industry, you grab the muriatic acid. If you want to do it quicker at home, go for the acetic acid if you don't want muriatic around. At the end of the day, look at the above thumbnail, as it proves what I said in the earlier post, you can clean that fuel tank up all you want with the solution, but the rust that has now been removed was once the metal of the fuel tank. So how thin in spots is your fuel tank getting? If the magazine on the left, is the actual same magazine as on the right, you'll notice it even introduces more holes... Well, rust removal in general actually does that. The fuel tank isn't very thick. So, I'll state again, look to replace the tank, replace the fuel hanger, and pump, work out how the rust and shit is making it past the fuel filter, and getting into the injectors. That is the real problem. If the fuel filter were doing its job, the injectors wouldn't be blocked.
    • Despite having minimal clothing because of the hot weather right now, I did have rubber gloves and safety glasses on just in-case for most of the time. Yes, I was scrubbing with my gloves on before, but brushing with a brush removes the remaining rust. To neutralize, I was thinking distilled water and baking soda, or do you think that would be overkill?
    • You can probably scrub the rust with a toothbrush or something. After you get the rust off flush well with water to neutralize and you will probably want to also use a fuel tank sealer to keep it from rusting again.
    • The sodium citrate solution is designed to buffer the citric acid to keep it from attacking metal quite so much, the guy that came up with that recipe did a ton of testing on how much metal loss occurs over time and it's nothing crazy unless you forget about it for months:   
    • Ohhh I see lol To be honest the main reason why I wanted to start modding is because of a business trip to Japan and Indonesia. I saw many cool and modded cars all throughout in these countries, especially Japan. I myself am of Chinese+Japanese nationality and when living in china (never lived in Japan js my dad side lol) I remember staring at these cars pass by with their loud tacky exhausts and insane wide body kits. And when I went back to Japan, I got even more invested even asking people about their cars and why they modded. Most gave similar answers to what you said but funny enough one guy just said that he saw the need for speed movie being filmed once in Tokyo I think near Shibuya Crossing and got inspired to tune and mod. After that I just started to fantasize on owning a car like that. Also tbh I prefer the R32 over the R34 it's just the R34 is more iconic lol (also apparently better aftermarket support than the R32) and my only goal really is just to make the car mine and make it fun to drive. As much as I love my Cayenne it's pretty bland to drive. Sure the interior is nice and pretty, gives you attention yada yada but I've wanted to experience what it is like to have a car that is truly yours. I suppose thats the goal so far. Haha if you find where I'm from, then sure. Ill help you out on your next "financial decision"
×
×
  • Create New...