soru81

Hi!

I have the problem with hitting too much boost in lower rpms. The engine is not completely broken-in, therefore I've just started to boost it in low revs only (2500-3500max) and only momentarily. I can hit like 11,5psi of boost, which means something is wrong with my setup.

I have 3in dp,mp,cb, intake, no airpump, pettit ecu, new type rs/rz turbos (new actuators too) with ported wastegate... Currently, I have both restrictions in nipples drilled out. The line from turbo housing to WG actuator is empty. The line from turbo housing to the precontrol actuator has the stock restriction pill from old turbos put in. The line from the WG actuator to the WG solenoid is capped. The line from the precontrol actuator to the precontrol solenoid is still in place. At least this is my setup as far as I remember.

Obviously something is wrong, because with a setup like that I would expect no more than 7psi of boost, if the wastegate is open at all times. So I'm going to double check everything this weekend, so I need to know what do you think could be causing this and help me answer some questions:

1.If I accidentally forgot to cap the line from WGA to the WG solenoid, this would be a minor boost leak (at least that what I would think). How much evident would this small boost leak be? Meaning, if I boost up to almost 12psi, is it possible then for this to be the cause?

2.Are the restrictor pills in the old turbos both of same size? Is it possible, that the problem is with the restriction pill in the precontrol line or with the connection to the solenoid? I tought precontrol system only controls boost during transition from single to twin turbo operation, but some ppl say it controls boost for the whole single turbo operation. What's up with that? I need to check those turbo systems diagrams again...

3.Is it possible, that this would be boost creep because extremly free flowing open exhaust? I think not, because most in other threads when ppl refer to boost creep, they experience it higher revs (5000+). I don't know if this is a spike or creep because I (rather not) do it only for a brief moment.


Thanks everbody for contributing!

soru81

Anyone?

soru81

Can at least someone tell me if it's possible I get such high boost because turbo precontrol valve would be closed for some reason (pill rotated and blocked the hose to the TPA)?

Narfle

iTrader: (16)

take the restrictor pill out of your precontrol.

soru81

I will probably try this too... Anyways, the thing is that the stock 99 restriction in nipples were drilled out for both precontrol and wastegate line, because I'm planning to replace it with manual and el. boost controllers. If I take the pill out of the precontrol line, I will probably get boost spike after transition, because too much prespool for the 2nd turbine.

soru81

Also, why doesn't wastegate valve (i presume it is open) redirect the exhaust away from the primary turbo. According to this scheme, I think it should... http://www.autosportracetech.com/RX-...BigPicture.htm

Trexthe3rd

If I remember correctly, with no vacuum to the WGA like the way you have there, the WG is in the full CLOSED position. Meaning all exhaust gas is directed throu the turbo (the WG default position is closed not open).
I don't quite understand what you are doing. By capping off the WGA you have no control over you turbo, did I miss something or did you leave out how you are controlling the boost?

soru81

Actually, there shouldn't be any vacuum in any of those lines as far as I can tell. The WGA start to move as the pressure rises above 7 psi (the spring in the actuator). For now, I only have one hose to the WGA, that is from the t-housing. The other one is capped.


It is only temporary solution I used to test my wg capabilities and find out what would be the lowest boost I can run. It is also useful for the latest phases of brakening engine in. This setup should give the WGA full boost reading, therefore it should fully open the WG asap. Therefore this setup should provide minimum boost.

I have the profecB, but don't intend to put it in until I solve this one...

1234rotor

iTrader: (1)

TREX, you are right. Pop off the hose to your wastegate and you have full un gated boost!! Mine was like that for a few nights and I would see over 1 bar of boost a couple seconds before the fuel cut would come in...the car was flying!!

Plug your WG actuator solenoid hose back in!!


Ummm.... how is it said???

Pop goes the wankel!!?

soru81

1234rotor: I don't think you are quite getting my situation. I have the line from the TURBO housing to the WGA attached. It's empty. Then, the other line from the WGA to the WG solenoid is capped. Meaning the WGA has only one source for boost and no ecu controlled leaks (which is what solenoid is). If I put the hose from the wga to the solenoid back, it could only get worse, since the solenoid will try to bleed off the boost seen by the WGA -> not opening the WG.

At least that's my understanding. Please tell me the logic behind your statement.


And don't worry, I will not pop the engine. I'm being very carefull with it...

PandazRx-7

iTrader: (18)

You could have just unplugged the WG solenoid plug and had the same results...maybe the cap you used on the actuator is leaking, YES, a small leak can make a difference!!

If it's not that, I have no clue why your boosting so high if your WG is ported. Or is it?? Maybe they never ported it...hmmm.

Narfle

iTrader: (16)

electric boost controllers are all crapola, search for damians manual boost controller, it own any electric.

soru81

Hmmm, I think I might have found the source that's causing me problems...

I went through the damians thread and scheme again. I realized, I didn't actually cap the actuator, but just by passed the solenoids! Like shown here: http://www.myrx7.com/images/damian_setup.gif

Off course, this works if there's BC in the line, but not if it's empty. Since the solenoid functioned like a closed cap until it is not open, I presume that the line after the solenoid is vented in the atmosphere or somewhere else and without any resistance. Meaning that my boost in the line to the WGA is immediatelly vented and the WG stays shut! Now that I have passed the solenoids, there is no resistance in the lines. So I really need to cap that thing 2nd line from the actuator!


Thanks all guys for helping. I'm almost certain this is it, I'll let as I try it!