Jump to content
SAU Community

Stock Valve Train Rev Limit

bigcarl

By bigcarl,
in Engines & Forced Induction

 Share

Recommended Posts

BezerkR32 Veteran

BezerkR32

Posted
Posted

Have dynod a few RB25s with similar modifications. Standard pring limit seemed to be around 7000rpm running 20psi boost. Tune started to get ugly over & above this. the fittment of Tomei springs solved issue, can know rev the engine to 7800rpm at 25psi. Cars are tuned at UNIGROUP in Sydney. Can contact them for any further advise. 02 9631 2470

Does anyone know for sure or has had experience when valve float has started to occur in the 25's with whatever modifications they have had done?

Im curious to know if it happens often or not at all, i have yet to see anyone complain about 25det and valve float. Ive heard its a problem in neo25's cause their springs are weaker then the previous models, is that true as well if anyone knows?

  • 3 years later...
Guilt-Toy Grand Master

Guilt-Toy

Posted
Posted

I know this thread is years old but Better to bring it back from the dead then to create another thread.

Anyone have any more experience with the stock valve springs on rb25det with bigger cams? I am using the Kelford 264's with 9.5mm lift.

I run RB30DET and keep the revs below 7100rpm and have not had any dramas with 2 bar and over 374kw at wheels but i do realise the bigger cams will be much harsher on the springs and could cause some issues.

Should i just replace the springs at the same time or just give the cams a go with stock springs?

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
      Chris' Toyota Mark ii JZX110

      By PranK · Posted

      This looks great! Awesome to have the 5 speed with an LSD in this. The Recaro's look like SR2's or SR3's. It's a shame they've been retrimmed as they would have looked sweet in their original colours. I think I'd want my agent to be a little more up front and informative too. I've never imported but I reckon it would make me a little nervous, so the more info the better.
    • soviet_merlin
      Duncan's V37.......race car?

      By soviet_merlin · Posted

      Thanks for doing that Duncan! Makes you a good person in my books. We don't get kangaroos or wombats here. But we have bats and it's similar. AFAIK it's often the mums with a baby attached that get hit because they drop lower when starting from a tree. If you hit an animal, check on it. https://www.ifaw.org/au/resources/wildlife-rescue-app An app to get the closest wildlife rescue contact.
    • Murray_Calavera
      Jacks that fit under GTR lips that can reach the subframe?

      By Murray_Calavera · Posted

      My dream is also to have a proper hoist, but I don't think it will ever happen. My quickjack is probably as close as I'll ever get, it really is very good though. 
    • Duncan
      Duncan's V37.......race car?

      By Duncan · Posted

      Yeah we keep on in the dailies, it is pretty poor how many animals get hit and the driver leaves without checking....have saved a couple of little ones over the years. Bit of a gruesome job though, pouches generally need to be cut open because they are so tight and often the joey doesn't realise mum is gone so they are still locked onto the teat. I checked the modules in front of the DS wheel where an oil cooler should go.... There is the radar unit - that can go for race use) One of the 2 HX water pumps, the silver cylinder. That needs to be kept but might be able to be relocated But the bad news, the big computer mounted vertically in front of the wheel (blocking any potential air exit) is the electric steering computer. That is required until/unless i do a hydraulic steering conversion, and in CAD based modern car design it is not like I can just pop a big unit like that somewhere else (plus the loom would be too short anywhere else too). So, the passenger side is OK to clear out (just use a smaller washer reservoir, potentially elsewhere), but the DS no beuno
    • Duncan
      Chris' Toyota Mark ii JZX110

      By Duncan · Posted

      Well, all the best with the new camry It was interesting to hear about the UK process, it is generally a lot more streamlined here with a shipping agent looking after all the import side (noting the exact final price can still be a surprise.....) and I've used a few different brokers on the japan (or US) side, and never had any trouble with any of them....luck of the draw I guess. You mentioned you didn't get the auction sheet (understandable since you bought it from a dealer, not auction), but I always try and get hold of that because they are pretty thorough. I've imported 2x R grade vehicles over the years and both were fine, repairs in Japan are pretty thorough compared to here in Oz.
×
×
  • Create New...