Jump to content
SAU Community

Turbo Tune's Stock Rb20 Making 370rwkw

D_Stirls

By D_Stirls,
in South Australia

 Share

Recommended Posts

  • Replies 50
  • Created
  • Last Reply

Top Posters In This Topic

Popular Days

Top Posters In This Topic

Popular Days

D_Stirls Veteran

D_Stirls

Posted
  • Author
Posted

As SLED said shimming your valve spring will reduce the amount of lift you can achieve before you encounter binding issues. So it will depend on what lift cams you have as to how much you can shim them if you can at all.

morbsy Enthusiast

morbsy

Posted
Posted
dude, im not saying your wrong or right etc.... i just want to clarify the rb20 that they have built was a lazy engine that was replaced my a fresh one out of a customers car, which had been laying around, they put it in an s14 shell, used a whole heap of parts laying around and FOR A LAUGH tried to find the limits of the motor, It was over a few beers, a few mates and a few laughs after hours and im pretty sure they intended to blow it up, It was by no means an example of what they'd deliver to a customer in any way...

do a search man, i personally wouldn't run any more than 17-18psi which a thicker headgasket.

sweet, so 7-10 would be safe with a decent tune then i guess

grandmasterb Grand Master

grandmasterb

Posted
Posted
As SLED said shimming your valve spring will reduce the amount of lift you can achieve before you encounter binding issues. So it will depend on what lift cams you have as to how much you can shim them if you can at all.

I realise that but just wondering who shimmed them and to what tolerance, cost involved etc.

Im installing 264/9.0 cams into my RB20 which are direct drop in for clearances but wondering if its worth shimming stock springs, buying upgraded items or just let it be :)

Cheers Ben

jager Community Regular

jager

Posted
Posted
QUOTE(jager @ 3 Jun 2008, 04:13 PM)

mate seems like turbo tune ain't change much since back in 05/06 they overtuned my engine which almost went bang, before i ripped it out and put a new one in then took it blackwood dyno got a tune from them sudden;y more power better response and it didn't wanna go bang anymore,

then they told me wasn't us it was u!!!

for the 1500 bucks i spent on rb25det including buying and installing and tuning (only 40,000ks on engine) i didn't bother trying to chase it up legally would have cost me to much then

thats my glowing recommendation for turbo tune love ya!!

dude, im not saying your wrong or right etc.... i just want to clarify the rb20 that they have built was a lazy engine that was replaced my a fresh one out of a customers car, which had been laying around, they put it in an s14 shell, used a whole heap of parts laying around and FOR A LAUGH tried to find the limits of the motor, It was over a few beers, a few mates and a few laughs after hours and im pretty sure they intended to blow it up, It was by no means an example of what they'd deliver to a customer in any way...

i realise that it was for fun, i was just dissapointed how they handled the situation on my vehicle and because of my dissapointment i want to put my 2c in, however if they treated all there customers the way they treated me they wouldn't have a business so obviously i was that one unlucky customer, as stated above, really how am i going to prove it was them not me or vice versa, so i cut my losses and moved on.

however i am intitled to give my opinion on how i was served

and i leave it at that as this isn't a thread about me

SLED Grand Master

SLED

Posted
Posted
I realise that but just wondering who shimmed them and to what tolerance, cost involved etc.

Im installing 264/9.0 cams into my RB20 which are direct drop in for clearances but wondering if its worth shimming stock springs, buying upgraded items or just let it be :)

Cheers Ben

Ben unless you're planning on revving the thing alot more than it was designed, go with the stock springs. Shimming is never a good idea and is usually a cheap way out of avoiding valve float at extremely high rpm. We used to see boy racers either shim the crap out of their springs and end up breaking overhead gear due to binding or others that would use double & triple springs which would end up pounding weltite inserts deep into alloy head chambers.

If you are seeking extremely high rpm though, you'll also need to think of upgrades on your internals to be able to cope. Stock springs would be fine if you're only going an extra 1000rpm or so.

Ryanrb25 Grand Master

Ryanrb25

Posted
Posted
i realise that it was for fun, i was just dissapointed how they handled the situation on my vehicle and because of my dissapointment i want to put my 2c in, however if they treated all there customers the way they treated me they wouldn't have a business so obviously i was that one unlucky customer, as stated above, really how am i going to prove it was them not me or vice versa, so i cut my losses and moved on.

however i am intitled to give my opinion on how i was served

and i leave it at that as this isn't a thread about me

yea thats fair enough champ, im not defending anyone but turbo tune have been there for many years so they have to be doing something right i suppose.

grandmasterb Grand Master

grandmasterb

Posted
Posted
Ben unless you're planning on revving the thing alot more than it was designed, go with the stock springs. Shimming is never a good idea and is usually a cheap way out of avoiding valve float at extremely high rpm. We used to see boy racers either shim the crap out of their springs and end up breaking overhead gear due to binding or others that would use double & triple springs which would end up pounding weltite inserts deep into alloy head chambers.

If you are seeking extremely high rpm though, you'll also need to think of upgrades on your internals to be able to cope. Stock springs would be fine if you're only going an extra 1000rpm or so.

On the other motor limiter was set at 8850 and probably keep it there with this one as well with the additional parts (cams, injectors, z32 etc) to go in. Other than that its stock as a rock and will stay that way *touch wood* but will be a little stronger than last time eg: can run more boost/timing :happy:

I think i'll just drop the cams in and see how i go from there with the stock springs for now.

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
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • PranK
      New Skyline will be RWD and manual

      By PranK · Posted

    • GTSBoy
      Nismo GT Pro LSD configurations

      By GTSBoy · Posted

      No, you're wrong, and you've always been wrong about this. The Nismo has 2 sets of openings. One is a real 2-way, and the other is a 1-way. There is no 1.5-way possible with the ramps that they offer. A real 1.5-way does exist. That Cusco stuff I posted is a prime example. If the forward drive ramps are, say 55°, and the overrun ramps are, say, 30°, then you will get about half as much LSD effect on overrun than you do on drive. It is real, it realy works. OK, you're slightly right. The Nismo has 55° and 45° ramps on the 2-way, so it does offer less LSD effect on overrun. But, I think that just means that they've (probably) sensibly established that you do not want actually equal LSD effect on overrun. You just want "quite a lot, but not quite as much as the drive LSD effect".
    • DraftySquash
      Newbie from VIC

      By DraftySquash · Posted

      Just wanted to unearth this and post my baby with the new front ❤️😝 Took her to my wedding rehearsal today. Next up is getting wide skirts (after wedding)
    • Kinkstaah
      Nismo GT Pro LSD configurations

      By Kinkstaah · Posted

      Yea, that is what I was getting at in my ramblings too. The nismo one actually is a 1.5 way and a 1 way. They don't do a *2* way because a true *2* way would have equal ramp angles. Or is that a true 1.5 way? Realistically I think a "1.5 way" does not actually exist. A diff can either lock in two directions or one. It also doesn't help that a LOT of people in Australia speak about 1.5 way diffs are referring to their 1 way diff.
    • GTSBoy
      Nismo GT Pro LSD configurations

      By GTSBoy · Posted

      Well, the trouble with that ^^ is: The configuration shown is absolutely a 1-way, not a 1.5-way. There is no way that a 1.5-way can be said to offer LSD action only on acceleration. If Nismo cannot get that right, then it is impossible to believe their documentation. That ^ is not a 1.5 way setup. That is a 1-way.   And so now I have allowed all doubts to flourish and have gone back to look at the MotoIQ video. I originally made the mistake of believing him when he said "this is a 1.5-way" at the ~6:10 mark. Because what he did was take the gear assembly out of the 2-way opening and just rotate it one place to the left to drop it into the 1-way opening. When he dropped it in there, the cam was "backwards" compared to the correct orientation shown in all other photos of that config. The flat shold have been facing the 1° ramp side of the opening, not the 55° ramp side. And I thought, "gee that's cute", but I was concerned at the time, when he put the other ring back on, that the gap between the rings looked like it was wider then in the 2-way config. And then I said a lot of things in my long post on Tuesday that could only make sense if the guy from MotoIQ was correct about what he'd done. BUT... I have now done my homework. I grabbed a frame of the video with the 2-way config, and then grabbed another with the "1.5-way" config, snipped out the cam and opening of that frame and just pasted it direct on top of the 2-way config. I scaled it so that the triangular opening was almost exactly the same height in both. AND.... the gap between the plates is wider with the cam installed in the triangualr opening backwards. That is.... it cannot go together that way. There would be massive force on the plates all the time, if you could even reassemble it.  So, My statement on the matter? The Nismo diff is actually only a 2-way and 1-way. There is no 1.5-way option in it, regardless of what they say. Here's a photo of a real 1.5-way ramp opening from Cusco (along with the 1 way option). And the full set of 1 through 2 way options from their racing diff, which is not same-same as what we'd typically be using, but...the cams work the same. A little blurry, but it comes from this Cusco doc, which is quite helpful. AND.... Cusco do in fact do what I suggested would be sensible, which is to have rings that do 1 and 1.5, and 1.5 and 2. Separately.  
×
×
  • Create New...