Hi guys,

 

Finally put my car on the dyno yesterday. Fuelling is looking good but one thing that's been pretty obvious for a while and is now even more obvious is that the wastegates are opening too early, even with the Apex boost controller maxed out. The tubs are hybrids based on the stock items and should be good for at least 400HP, boost is not quite making 1 bar on the dyno altho it can get to just over a bar on the road.

 

Anyone aware of any aftermarket or uprated actuators being available?? Alternatively, is a bodge possible with stronger springs? There's plenty of duty left to spare in the injectors (555cc), they didn't get above 65%.

 

Max corrected HP was 362HP, 301BHP at the wheels, torque was more impressive at 400 ftlb.

 

Cheers

H

get yourself some HKS or Forge actuators, don't bother messing around with spring rates in the stock actuators

Yeah im having this prob with actuators also.. pissing about..... i have HKS actuators on my gt25r tubs and they are adjusted all the way out and i cant get any more than 20-21psi. I get 20psi at 95% on the ebc. kinda sucks ah well...... oh btw it will be engine out to fit the actuators :(

 

at the redline my boost pressure drops to about 15-16psi :( i get all my horses at 5700rpm, is it normal for this to happen shouldnt the boost stay all the way to the redline?

I thought it was meant to hold full boost all the way up the revs. And ive also been told that the new actuators can be done in situ, just a ball ache. Im in the same boat, mine would spike to 20psi but be back down to 14 at redline. Cant wait to get it done and mapped.

I think forge said about 165 quid each for actuators, that was for custom ones for my GT2871's. So must be similar.

cheers

danny

Thanks guys, I'm pretty sure I could do the actuators on a ramp. I've pulled the engine once before and don't intend doing it again unless unavoidable. I have less bulky exhaust headers than stock, makes it a bit more accessible, also lots of other stock stuff has been removed.

Was hoping for a less expensive option, maybe something from a different vehicle with similar tubs?

 

My boost peaks and more or less flattens out all the way to 7K, the controller is set up to feed it in progressively though. Just a thought, but once it's spiked and blown the wgates open it may be difficult for the actuators to close them again - maybe try bringing the boost on a bit more steadily??

 

Cheers

H

Thanks guys, I'm pretty sure I could do the actuators on a ramp. I've pulled the engine once before and don't intend doing it again unless unavoidable. I have less bulky exhaust headers than stock, makes it a bit more accessible, also lots of other stock stuff has been removed.

Was hoping for a less expensive option, maybe something from a different vehicle with similar tubs?

 

My boost peaks and more or less flattens out all the way to 7K, the controller is set up to feed it in progressively though. Just a thought, but once it's spiked and blown the wgates open it may be difficult for the actuators to close them again - maybe try bringing the boost on a bit more steadily??

 

Cheers

H

 

yeah that makes perfect sense, bring the boost in smoother, thing is i have tried this and it did made a difference, i turned the gain down on the rollers and it gave out a steady curve. I might have to turn it down some more and see the out come. Its just super dangerous in 4th gear trying to watch boost and the road at the same time when your down over 130mph lol

Ahh...the joy of the AVC-r and it's ability to log a 25 (?) second boost trace graph and replay later ;-)

 

H

Fair price??

 

http://cgi.ebay.com/ebaymotors/HKS-Upgrade-Actuator-Kit-300ZX-Z32-VG30-Twin-Turbo_W0QQcmdZViewItemQQhashZitem2c4ce1e931QQitemZ190268434737QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories

Fair price??

 

http://cgi.ebay.com/ebaymotors/HKS-Upgrade-Actuator-Kit-300ZX-Z32-VG30-Twin-Turbo_W0QQcmdZViewItemQQhashZitem2c4ce1e931QQitemZ190268434737QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories

 

Thems are the ones i gots, Cant hold more than 20 psi on my setup... hmmmm

Ah. Ok. TBH I don't really want to run more than that - that's quite a lot of boost for stock internals on a tt.

 

I'll keep looking...