I just got my rx8 back together. i bought the car got a good deal because it wouldnt start. i had to replace the engine. the car had a greddy turbo kit on it. i put it all back together and it ran good for about a day the boost gauge was working and everything. Then yesterday the blow off valve was messing up found out the greddy type rd bov screw on to was stripped. fixed that but then today the turbo lags in 4th 5th and 6th sometimes in third it will build boost then lag. and help would be greatly appreciated. i am new to this rotary engine stuff and turbo stuff. Thanks in advance.

 

Do you know what modifications have been done to the set-up? What are you using for engine management?

 

i am using emanage from greddy and none that i know of stock greddy turbo kit with type rs blow-off valve.

 

the bov was making the whistle sound then the screw stripped and now it doesnt.

 

Sounds like you may be having a problem with the waste gate. Is your waste gate adjustable?

 

Type R BOVs are known to be a POS. Could be the BOV just leaking under boost but then again there could be all sorts of other gremlins loose starting with but not limited to the E-mangle.

 

Its greddys t618z turbo i do not know it the wastegate is adjustible

 

Also fix #2 where do i hook up the line? There is already a tap that is hooked to the boost gauge. Do you hook it to the emanage sensor hooked to the bov and intake?

 

Any chance you can post a video?
I'm not convinced from you description its lag you are experiencing

BTW .. get rid of the Emanage while you're at it

 

Don't forget if you have any leaks after the turbo on the intake side (that's were you want the waste gate signal, before the throttle body can be as close to the turbo as you want) and your loosing metered air the car will run pig rich and most of the boost will escape. Your boost gauge should be connected after the throttle body, to see the boost the engine is seeing. Re-check all your couplers then remove the BOV just to test to see if that was the problem (the stock kit has no BOV, it's a little harder on the turbo and stops it's momentum but it will be fine to diagnose) and I hope this goes without saying make sure theres a good seal where the BOV was, I would just put a peice of sylicone hose over the pipe and clamp both ends that way it's easily undone. How's your idle?? Any A/F gauges or readings?

Good luck!

Cheers

 

i have a video on the way and i dont have an a/f gauge yet the idle kinda wants to stall out sometimes but it saves itself.

 

Also make sure the oposite isn't happaning and your detonating from running lean it would sound like a bucket of bolts. Did the previous owner state why the engine blew? That sounds rich could be a leak, but definatly invest in a wideband A/F gauge. I would take is easy on her till you find the issue, also keep in mind the high gear higher speed pulls ask more from your fuel system. Get everything up to snuff to avoid changing the engine again. Any budget left over from doing the swap?

 

Yeah i have a little left over to spend and a the cel came on with p2070.

 

That's a intake tunning code, make sure the 2 vaccum line going from the upper intake to the lower intake valves are connected and that the acctuation functions properly and that the wiring harness at the back of the upper intake all 3 connections are pluged in. Budget wise, access port MazdaManiac (this also inludes him tuning it!) $600, coils BHR $550, A/f gauge $200, fuel gauge $100 + $65 for the BHR Aeromotive fuel line adapter, $100 upgraded fuel pump. If you can muster that it would help for sure!

 

it just threw p0301 code also. i checked all lines and connections where is this valve so i can check the operation and how do i check the operation?

 

Stop driving the car with a emanage o.O check all your plumbing.

 

You have one valve on the side close to the front of the motor and one in the middle under the upper intake manifold. This other code is not good it's a misfire, get a good rotary compression test done you may have to go to Mazda, cross your fingers you didn't blow this motor, and if you didn't you need the parts list I posted above before driving this car any further. Stay out of boost till you know.

 

why is emanage so bad? and how do you check proper operation

 

Make sure the arms move well and there's no un-linear resistance. But honestly this is the least of your worries at this point. E-manage is very basic, untunable, and generally unreliable, but it may not be the culprit. Did you swap the engine out yourself?

 

I am not sure the e-manage ever 'properly operates'

If you find your leak or stuck valve wherever, you are still in for lots of hurt until you get a better management setup

 

yes i did the engine swap and im not sure i have the greddy system hooked up correct but i have everything hooked up the way it came off. i just checked the valves and they are fine.

 

best i could do the clock spring broke so i have the steering wheel off.

 

 

Sounds like your BOV is leaking . To test this - try taking the BOV off and put a flattened soda can in to block off the hole then reattach the BOV .
You should not be running a VTA BOV with a MAF based tune anyway - but that is another story.

 

Yep I agree with Brettus on the BOV maybe being the problem, engine didn't sound like it was detonating (it's hard to tell with the wind noise), so hopefully the misfire code is from loading up the plugs, it's easy to pull the plugs and check.

I've got a VTA BOV and it works great, but it's a dual piston Forge that doesn't leak at idle it needs vacuum and positive pressure to open.

If everything is top shape with the BOV and intake side of things, maybe turn attention to the tuning, it be nice to see a data log of whats going on. Or possibly fuel pressure but this would be under hard acceleration and would recoup faster then what it seems to do (higher gear needs more fuel for the same RPM and throttle)


http://www.greddy.com/upload/file/03-RX8_TK_T618Z.pdf that's the link to the turbo installation if you want to double check e-management and other things

cheers