Rixio_Scon

Howdy all,

I only realised this a few days ago when going over an old dyno sheet. The car can't be running right!

I havnt driven the car at all since the dyno session and have had a 4.5k rev limit due to boost creep so my engine builder whacked me with a rev limit...

A little background:
New Extend Port Engine,
Uprated 100psi Solenoids,
New Silicon Vacuum Lines All Correct,
BNR's in seq,
Ti Exhaust,
Cosmo UIM & LIM,
HKS FMIC,
HKS Elbow,
HKS Downpipe,
All Hard Intake Pipes
Power FC
Stock Primaries & 1680cc secondaries

The problem is...it runs like a non seq. It makes 0.5bar from 2k rpm through transition all the way to 5k rpm where it climbs to 1bar (15psi)
Its like driving a damn single...

At 3k rpm its only making 140 fly wheel torque and at 5k only 180fly torque...

It was all done at Thor Racing in the UK on a Hub Dyno

I cant post up my dyno sheet because i dont have a scanner but its almost identical to this one thats running Knightsports Twins in Non Seq form!

All the actuators clips and arms are all still intact as are the vacuum lines to them. The flap in the Y pipe isnt stuck and the actuator is working. No boost leaks or split hoses etc.

I spoke to Brian last night and he said to fit some boost pills betweem the turbine housing & actuators...just waiting for him to send them

Does anybody else have a take on this?

What the fajizzle is the problem???

Mahjik

iTrader: (1)

Sounds like either an issue with the Charge Control or possibly the Pre-Control but I would wager more on the Charge Control.

Rixio_Scon

You mean the CC or PC solenoids?

I forgot to mention i had changed those with another pair and it made no difference. I also tried swapping the electrical leads and again no difference. Tried swapping the vaccum lines again no difference...

Mahjik

iTrader: (1)

It could be the physical Charge Control actuator. People have been known to have to change them on the y-pipe. Here's an old thread which sounds similar to your problem:

https://www.rx7club.com/showpost.php...88&postcount=5

Rixio_Scon

I'll try another actuator tmrw but im pretty sure its fully operational i tested it before i fitted it & tested it a few days ago by just sucking on the hose...i do have a couple of spares so hopefully it may be that simple.

Do you know the part numbers for the Air Bypass Valve & Charge Relief Valve? (The brown ones)
Mine both seem to have the same part numbers, but as far as i knew they both have different functions, could that be a contributing factor?

Also where can i buy Viton Check Valves cos i cant find any those are the only things that i havnt upgraded yet...

Mahjik

iTrader: (1)

For starters, the fact that you have secondary boost means that both the ABV and CRV are working. Now, the ABV and CRV have slightly different operating parameters, but they could be interchanged without much of an issue. Some people use aftermarket BOV's in place of the CRV without causing an issue.

Send a PM to "DaleClark" about the Viton check valves.

Rixio_Scon

I thought it best to ask just incase...Thx man your a star

If the problem isnt the y pipe actuator what else could it be? Is there anything else it could be? Wastegate open, turbo actuators themselves or something?

Mahjik

iTrader: (1)

The Pre-control basically acts like the wastegate for the primary turbo during the first part of the boost pattern. That's why I also listed it as a possible problem area.

Rixio_Scon

So what would the solution be? Replace the actuator unit at the front of the turbo? Is it an easy job to do? Will i need to remove the turbo pack to replace it or can i do it with the turbos still on the car?
Like i said i already tried replacing the solenoids but to no effect...

Bryan@BNR

iTrader: (1)

7 psi is base pressure for the actuator. I would put the .060 restrictor in the vac line going from the compressor housing to the boost actuator. That will allow your solenoids to work properly... They will not work if the restriction isn't there. Thats why you are stuck with 7 psi.

Bryan@BNR

Rixio_Scon

Did you get my email Bryan?

Bryan@BNR

iTrader: (1)

If it is only running on one turbo, you need to pull off the inlets of the turbo to see if the turbochargers have excessive movement. If the rotating assembly is hitting the end housings, then you have a turbocharger problem. If you don't have issues with that, then the actuator in the exhaust manifold/Y pipe aren't opening properly.


Bryan

Rixio_Scon

I think i just assumed its running one turbo, from the symptoms. You know better than i do. When i fitted the pack it was in perfect condition with no shaft play or anything and since then iv only run in my engine and got back from tuning. I dont think theres anything mechanically wrong with the turbos it was just a figure of speech so to speak due to boost issues.

Did you manage to get hold of some pills for me? Do you have a paypal or do you want a card payment for them buddy? Either email me or pm me and let me know please because i could do with them asap.

Thanks

Rixio

Rixio_Scon

http://www.holley.com/122-60.asp

Are these what i need guys? Do i just insert them into the vacuum line job done, or is there a specific way of doing it?


Thanks guys

Bryan@BNR

iTrader: (1)

did the restrictor pills work in your car to fix the boost issue?

Bryan