Fixed my second turbo issue, it was the turbo control solenoid. Thoguh it feels a little slow but then again I could be wrong.....it also feels a little lagish when regainning 10 psi between shifts...but then again I have never had a 10-8-10 so I can not say anything haha. I use ball spring MBCs with 1/16 holes drilled in for reliefe....I didnt have anything smaller, could this be the culprit?

 

I doubt the 1/16" holes are your problem...I ended up having to use that size on mine. although I am still having secondary problems.

 

If you shift so that you go from above 4500, to somewhere between just below 4500, it tries to bring both primary and secondary back online together rather than prespooling the secondary. So it's a little laggy when both try to come online together. I _think_ that is normal, but I should check on it (my car does it). I think I'll run a search

Dave

 

Try this thread:
https://www.rx7club.com/showthread.p...oost+slow+4500

 

THANK YOU!!!!!!!!

I have been trying to find info on this for the last 2 weeks. apparently I suck at the search function

 

Thanks but it didnt seem to be any of those problems....I guess its just a stock thing...becasue I dont have trouble buidling the 10 psi back up it just seems it takes a little while for it to spool back up. The PSI rises but it just seems to be doign so a tad bit slowly.

 

The 1/16 holes are too big. That will cause a delay in pre-spooling the second turbo (resulting in your lag). It could possibly also cause boost spiking. Both would be due to bleeding too much air, causing the pre-spool actuator to respond slower.

The 1/16" hole will also cause the WG actuator to respond slowly - same reason.

I used 0.020-inch diameter bleed holes. You can get this size from McMaster-Carr.

 

I was surprised I hit the exact reference i remembered within 2 minutes. Maybe it's luck, maybe it's Jedi forum search skills

Dave

 

BTW, I don't have a response lag at transition with ball/spring controllers (see my signature) - it is almost instantaneous.

 

Yeah I know your the one I got the dual ball spring boost controller Idea from thanks for the info, but If I am not mistaken I actually ended up using a .002in bit...not sure but I remeber it had a .0 2 something....if the hole is too small then what could be the problem? Actually I was meanning to ask, do you only drill the hole in one boost controller or both? I did it in both...wasn't really sure and was too lazy to ask the other day.

 

You couldn't have used a 0.002" dia - that's 1/3 the size of a human hair. It must have been 0.020" dia. That's what I used in both controllers. What are the lengths of the lines connecting the controllers to the Y-pipe and the actuators? If they are too long (especially from the controllers to the actuators), that will also cause some lag due to having to fill and bleed the air from that volume. I assume you blocked the actuator exits close to the actuator so I assume that there is not a lot of volume there.

If the either pressure and/or vacuum reservoir are not connected or holding pressure/vacuum (bad check valves or hoses popped off or cracked) the turbo control actuator will be slow to actuate or not actuate at all (it uses both pressure and vacuum to actuate). That will cause a serious lag at transition.

Hope this helps.

 

no no its not the trasnsition from primary to secondary, hell that works just fine, real fast. Its when I am shifting.between gears...so obviously it'll take just a little time to re spool the second back to 10 psi right?

 

If you're going hard, and on the upshift the next gear engages above 4500, it should be primed and ready to hammer.

Dave

 

Turbo troubleshooting links, in case you haven't seen them:

http://www.autosportracetech.com/RX-7/rx7stuff.htm
http://www.autosportracetech.com/RX...bleshooting.htm

 

Here's a couple of interesting threads that might relate:

https://www.rx7club.com/showthread.p...disney+solenoid

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/twin-turbo-probs-424079/