Jump to content
SAU Community

Recommended Posts

i put on a high flowed, steel bladed VL turbo onto my rb20det and originally spooled up at 4 grand which i was told was about normal...

anyways i had a turbo rattle so i pulled the xhaust off to find out the wastegate flap in the back of the turbo was loose, so we bent the wastegate actuator arm to tighten it up... now the car spools up at 2100rmp and 15psi by 2600rpm, is this safe having the wastegate so tight???

does anyone know???

anyone got a VL T on a rb20det wats your spool up???

thankyou

Link to comment
https://www.sau.com.au/forums/topic/83474-rb20det-with-vl-t-quick-spool/
Share on other sites

Can't really be that much of a problem I wouldn't think

Makes sence that if the wastegate was loose, the air was bypassing the turbine, hence late spooling.

Count your blessings that you are fully boosting at 2600 on an RB20 with high flow, plain bearing turbo!!!

BASS OUT

just forgeys and bored out 20"....

neways on the topic does anyone know if this is dangerous in regards to wastegate being so tight?

if you got some headwork doen when you got the rebuild done it would make it spool quicker. By headwork im referring to a port and polish or bigger valves.

its got me f*#%#@ but its good tho well sort of its a bit too responsive.

how ever if i give boost up and let go after my flutter there is a small hissing sound which goes away a couple of seconds later!

could this be beacuse the door closes so quickly sum air is still stuck and can only just escape out not flow out like before?

or is this a diffrent problem?

i would like to know how a bigger turbo.. hiflowed... t03 off a VL that would normally come on around 2500 on the 3ltr...

comes on almost the same as a motor 1000cc less...

sorry but i might not be an xpert but i know enough!

and yes it is a VL T hi flowed and yes it really does have steel blades

and for sure its bigger than my rb20 turbo

By the sounds of it that spools up to quick,are you sure it is a flowed VLT turbo?

im in the backward case lol i have the RB20 T03 on my RB30DET lol spools up 2 fast just waiting 4 a clutch change and ill be putting my TO4B on but yer thats seems 2 be a very good spool up time for an old timer T03.

mine comes on full boost like 2000rpm or somthin im only running 10 psi and making 150rwkw.

whats it like up top end like duz it tapper off and at wat RPM and also what exhaust AR you got just asking if you know cause if you have like a .64 AR and it spools up that fast on a 2Lt thats mad maybe u found a cheap way to upgrade ya turbo lolololol ??

The RB20DET turbo is a little small for the 3ltr. :P

I find it has the meat of the power between 2000-3500rpm, after that it doesn't feel as nice but still rev's to ~5000rpm where it asks for a gear change.

if I over rev then it drops the next gear out of the meat of the power and instead of acclerating and making more power it accelerates as power drops off :D

Its a bad match in the R32, especially with its short gearing.

yw its very intresting like i am happy with the power form the rb20 turbo i think this one has more punch and i can boost higher with the steel blades but yeh i agree with your Rpm vs power! i have loosend up the wastegate and now i got spool at 2800 15psi by 3400rpm or there about i think thats a little bit better for the rb20det engine, but yeh i dunno i get dynoed in two weeks i was at 160kw before hand lets see wat happens now!

The RB20DET turbo is a little small for the 3ltr. :P

I find it has the meat of the power between 2000-3500rpm, after that it doesn't feel as nice but still rev's to ~5000rpm where it asks for a gear change.

if I over rev then it drops the next gear out of the meat of the power and instead of acclerating and making more power it accelerates as power drops off :)

Its a bad match in the R32, especially with its short gearing.

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

    • For once a good news  It needed to be adjusted by that one nut and it is ok  At least something was easy But thank you very much for help. But a small issue is now(gearbox) that when the car is stationary you can hear "clinking" from gearbox so some of the bearing is 100% not that happy... It goes away once you push clutch so it is 100% gearbox. Just if you know...what that bearing could be? It sounding like "spun bearing" but it is louder.
    • Yeah, that's fine**. But the numbers you came up with are just wrong. Try it for yourself. Put in any voltage from the possible range and see what result you get. You get nonsense. ** When I say "fine", I mean, it's still shit. The very simple linear formula (slope & intercept) is shit for a sensor with a non-linear response. This is the curve, from your data above. Look at the CURVE! It's only really linear between about 30 and 90 °C. And if you used only that range to define a curve, it would be great. But you would go more and more wrong as you went to higher temps. And that is why the slope & intercept found when you use 50 and 150 as the end points is so bad halfway between those points. The real curve is a long way below the linear curve which just zips straight between the end points, like this one. You could probably use the same slope and a lower intercept, to move that straight line down, and spread the error out. But you would 5-10°C off in a lot of places. You'd need to say what temperature range you really wanted to be most right - say, 100 to 130, and plop the line closest to teh real curve in that region, which would make it quite wrong down at the lower temperatures. Let me just say that HPTuners are not being realistic in only allowing for a simple linear curve. 
    • I feel I should re-iterate. The above picture is the only option available in the software and the blurb from HP Tuners I quoted earlier is the only way to add data to it and that's the description they offer as to how to figure it out. The only fields available is the blank box after (Input/ ) and the box right before = Output. Those are the only numbers that can be entered.
    • No, your formula is arse backwards. Mine is totally different to yours, and is the one I said was bang on at 50 and 150. I'll put your data into Excel (actually it already is, chart it and fit a linear fit to it, aiming to make it evenly wrong across the whole span. But not now. Other things to do first.
    • God damnit. The only option I actually have in the software is the one that is screenshotted. I am glad that I at least got it right... for those two points. Would it actually change anything if I chose/used 80C and 120C as the two points instead? My brain wants to imagine the formula put into HPtuners would be the same equation, otherwise none of this makes sense to me, unless: 1) The formula you put into VCM Scanner/HPTuners is always linear 2) The two points/input pairs are only arbitrary to choose (as the documentation implies) IF the actual scaling of the sensor is linear. then 3) If the scaling is not linear, the two points you choose matter a great deal, because the formula will draw a line between those two points only.
×
×
  • Create New...