GOTBANNED?

I wanna change my boost pills. Where do i get them? Is there another name for them? info please.

Falcoms

^ WTF Mates?

lilroach

this will be your best response to the question

part number: N3A1-13-ZLY <= both lines

https://www.rx7club.com/showthread.p...ighlight=pills


please use the search

dgeesaman

iTrader: (7)

Change them? Well there is nothing identical to stockers. However, carb jets are functionally equivalent and available in big load of sizes. But swapping pills or drilling them is tedious and not reversible.

Here's the question though: why? If you're doing it for boost control, then keeping the precontrol pill and installing manual boost controller (made with simple mechanical valves) on the wastegate is the most elegant and flexible.

Dave

BobfisH

boost pills are in the two lines right next to each other on by the two actuators on the passenger side (for usa people) low down on the engine, you will need to remove your air filters to see these small pipes. There is a picture on my website http://www.face2faces.co.uk/RX7/howto/ratsnest1.htm the lines with the pills in are in the bottom picture in the bottom left, it is the pair of blue lines next to the white glove.
I agree though, altering boost by changing pills is stupid. Get a proper boost controller.

JDK

iTrader: (8)

Junior , What are you trying to do ? You want more boost or less? Call me

GOTBANNED?

I know it's stupid but it just temp untill i get my boost controller. I really dont wanna do anything major untill winter when i blow my money on my car than. I have alot athings on order and wanna wait untill last to get my boost controller. Right now i wanna save my money as much as i can untill I do my work in the winter. As I'm sure a blitz boost controller can;t control sequential. Am I right?

jpandes

Go to Home depot and buy a Needle valve for $4.50. That will be the easiest temp or perm solution. With pills or carb jets you will have to test and swap them out. With the needle valve you can just turn the valve to adjust. Easy.

dgeesaman

iTrader: (7)

Actually, peak boost (10psi number) for the primary and secondary is controlled by the wastegate. So I think (haven't done it though) that installing is on the wastegate line should give you control over both '10's in your 10-8-10. So the Blitz may have no trouble with that.

The precontrol affects the 8 and ideally you can leave that alone, but maybe again a needle valve to control it. I think the way to do that is to set the wastegate first, then slowly increase the precontrol until you get about 2psi dip at transition without a spike afterward. If you get a spike when adjusting the precontrol, I would step back and re-evaluate.

Dave

DaveW

IIRC, isn't the primary boost controlled by the PC actuator venting primary boost to the secondary turbo (the charge-relief valve then vents any unwanted secondary turbo boost prior to transition)? In my case I am running primary boost of 11 psig, and after transition boost of 10 psig. These are individually controlled by separate ball-spring manual controllers.

If the primary boost were really controlled by the wastegate, I'd think wouldn't be able to get 11 psig primary (before transition).

dgeesaman

iTrader: (7)

Vanditmars says this:
"With only the Primary Turbocharger in operation, the Wastegate is NOT actively controlled by the ECU. Once boost pressure reaches about 10 psi, the Wastegate starts to open to bypass some of the exhaust around the Turbocharger, thus slowing down the Turbocharger. The Wastegate is not actively controlled by the ECU when below 4,500 RPM. The Wastegate solenoid is put in a fixed high duty cycle, (95% of the time on) which results in most of the air being vented from the Wastegate Actuator. At about 8 psi the Wastegate Actuator starts to move and by 10 psi the Actuator has moved enough to regulate the boost pressure to 10 psi. If boost is at 6 - 7 psi the pill to the wastegate could be missing, the Wastegate solenoid is not operating at 95% duty cycle, or the Wastegate is not mechanically connected to the actuator. "

And

"The size of the pill to the Wastegate Actuator in conjunction with the fixed 95% duty cycle of the solenoid controls the maximum Primary Turbo boost pressure."

But I tried to verify this using some of the Mazda sources and was unable to. the Mazda docs don't get that specific. I originally understood it as you described, until I re-read Vanditmar's info for the umpteenth time and noticed that. So I don't know who's more correct.

When I get my car issues sorted out (I had my injectors cleaned and I think one of the primaries kicked the bucket in the process), I intend to tee into that line to see exactly what pressure is seen by the pc and wg actuators, and then what pressure is required to open it. That little detail has been bugging me

It might be that depending on minor variations from car to car (actuator spring pre-stretch, boost pill setting, etc) the precontrol or wastegate could limit primary boost. Given that it doesn't take much modding (cb and dp for example) to change boost levels, I think what is true for an all-stock car might differ a little from a lightly modded or really modded car.

Dave

DaveW

I think what Vanditmars really meant is:

"Once boost pressure reaches about 10 psi after transition, the Wastegate starts to open to bypass some of the exhaust around the Turbocharger, thus slowing down the Turbocharger."

If you read it that way, it makes sense.

dgeesaman

iTrader: (7)

I agree. It's not truly clear. However, Rynberg (?) had related his experience with a wastegate-only MBC controlling both pre- and post-transition boost peak.

Plus, the first chunk of text suggests the precontrol handles levels of intermediate boost pressure, and that the wastegate controls when the boost maxed out.

In any case, I hope if I have a 10-8-10 going after my solenoid replacement/injector cleaning job in progress, I will monitor the pressure in the wastegate actuator and compare it to the Mityvac pressure that actually opens the door. That should tell me when/how much the door is open. If I can find a stock car, (maybe zkeller's project car?) I'll try it there also.

Dave

GOTBANNED?

well i just put my boost pills in and i'm hitting 13psi flat! feels really quick. Just to let ya guys know i used a 53 size holley carb jet.

moktan_fdtt

holley carb jets, your best bet.