Jump to content
SAU Community

Recommended Posts

Hi guys,

Having issues with my car (R33GTST), The boost is dropping from 18psi below 6000rpm to 3 psi (i.e. dropping 15psi) above that. Something wierd is happening. Just trying to check the actuator. I've tried 2 seperate boost controllers and once the boost is set above 12psi the boost drops off badly. Set at 10psi it will hold to redline

Anyone got an rb25 or rb20 one I can borrow or buy. I'm trustworthy :blush:

I think it could also be the exhaust, going to try dropping that and taking it for a run.

Cheers

PS. Im on the northern beaches. Would travel to hornsby etc...

Edited by benl1981

Thanks a lot guys. Might see if I can get closer though..

The preload is ok. I have an Rb20 actuator on it now that Im thinking may be suspect.

I have dropped the cat and it appeared ok.

The centre muffler is also under scrutiny :teehee:

I hope its not valve float or anything more major.

Sometimes it will rev to redline perfect but most of the time boost will drop to about 3psi

The thing is it worked perfect on the dyno for 2 hours and for the first week. Something has happened!

Edited by benl1981

When I first boosted my GCG with stock actuator hard it ran fine at the higher boost - 1.2 bar - for about 3 weeks then just wouldn't hold it anymore. I replaced it with an adjustable HKS one and that fixed it.

Hey Chris! I ended up getting my car tuned by MRC in Castle Hill. Closer to work. Mark is pretty reasonable and seems to know his stuff.

He thinks it is either the actuator/boost controller or collapsed cat/muffler.

I have kind of ruled out the cat and the boost controller.

Going to try the actuator and then drop the rear exhaust..

Hows your beast going?

Nice to know abob. When you say didnt hold how much was it dropping? Mine is dropping from 1.2 bar to about 0.2bar!

Thanks

Hopefully this will fix it!

Never dropped that much, more like 1.2 down to 0.9 which is why I suspect exhaust but maybe your actuator is broken rather than just oo weak to hold it.

Thanks for all the help lads.

Turns out my actuator is fine and everything else.

I modified the air snorkel to clear the FMIC intercooler pipe. (Im still using stock air box).

I just took the air snorkel off (sucking hot air I know) and holds 15psi to redline. Peaks at about 18. Just as I had at the tune. I had created too much of a restriction by reducing the air snorkel in places to clear the pipe!

I pulled off the inlet plenum (not fun), dropped the cat, Pressure tested inlet, bought HKS actuator and the answer was right there!! Could have saved all that mucking around

I guess on the dyno the bonnet is open so the problem didn't show up.

I might reuse the snorkel but bring in a cold air feed into the bottom of the snorkel..

Edited by benl1981

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

    • 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.
    • 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.
    • 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. 
    • 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
    • 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...