I am running a microtech ecu with a single turbo and dual wastegates. The wastegates don't seem to be opening and closing as a unit. Is it possible that this is because the microtech is not able to be tuned for dual wastegates. Don't know anything about Tunning and dual wastegates except that the dual wastegates help with spool on a divided turbo manifold and the ecu controls,timing,spark,fuel and afr. My car has been tuned by a well respected microtech tuner but still have trouble with the wastegates not operating together

 

The Microtech has nothing to do with the wastegates UNLESS you are using the Microtech boost controller.

Are you?

And if so, can you post a diagram of how you have it plumbed and wired?

Sounds like a plumbing issue.

 

Thanks Aaron for your reply. I am running greddy latest boost controller. I will upload some pics of the plumbing

 

https://cimg6.ibsrv.net/gimg/www.rx7...b01a24bc73.jpg
https://cimg4.ibsrv.net/gimg/www.rx7...53b3ea9dbd.jpg
https://cimg9.ibsrv.net/gimg/www.rx7...f2be399211.jpg
https://cimg3.ibsrv.net/gimg/www.rx7...41a5c50c26.jpg
https://cimg7.ibsrv.net/gimg/www.rx7...6b91832ce1.jpg
https://cimg2.ibsrv.net/gimg/www.rx7...d78afde94b.jpg

 

believe you're using wrong ports of the solenoid.

diagram attached.

 

Think I will take it to Pettit racing this weekend to square it away. I do believe that the plumbing of the wastegates is where the problem lies.

 

I run mine like Stick posted up

 

Thanks. Have you had any problems. My Mechanic has scared me a little. He believes there is a better chance of failure and that there is a better chance of blowing the engine with two wastegates.

 

well yeah, there is. there is exactly twice the likelihood of something failing.

the issue with wastegates is that they do not default to an open state, they default closed which means overboost and possible engine damage if you are not using the microtech safeguards.

 

Hmm. I must ask Kilo of he has the microtech safe guards ion there. Wow I would hate to pop an engine. I am thinking of leaving it,swapping it for single wastegate with dual runners going into one wastegate or just selling the whole set up and buying a turbllown Borg warner iwg set up. My set up is a 6262 Aspec 1ar divided. I like it but don't want to chance a motor over it. I also hear that it is hard to control boost under 15 lbs on the Borg warner. Decisions decisions

 

you worry too much, but it really depends on who put it all together for you and how cautious they were by both the tuner and the person who bolted the turbo kit together.

i would think Kilo sets the boost cut for whatever you say you plan on running, if not then he should start.

both boost cut and rev cut are things that can save your engine.

 

Yes Kilo did set it for what I wanted to run. He did all the work and it turned at great. Just having that dual wastegate problem. 1st and second gear the car is a rocket. Third and up not so much you can hear the dual wastegates not working together

 

the problem with dual wastegates is that even if you have both springs equal the backpressure in each runner may not be perfectly equal. it is not only the wastegate spring that determines when the valve opens but also how much backpressure there is in the runner that it is paired with.

in fact they won't ever work in perfect unison, but that is not to say there isn't something else going on if you are having issues holding boost. but if you are merely gauging the power by the erratic sound, you will always have that, you could collect the 2 dumps and it won't be quite as noticable if it is that bothersome, maybe even add a muffler to your collected dump..

it sounds more like you are having a boost controller issue, but the wastegates likely aren't the main problem.

 

I am not concerned about how loud the dumps are. I am just concerned about the fact that I am looking boost and there for loosing boost. Also losing turbo response in third gear and above. Damn how many people blow engines to dual wastegates. I thought they would work together.

 

if you're losing boost then the gates are working, if they weren't then you'd be hitting boost cut. the issue is with your boost controller gear judge or improper plumbing of the boost control solenoid and/or gates.


no matter how good a shop is, sometimes they make mistakes, every car is a little bit different after all. if he can't figure out the issue then maybe it's time for another set of eyes on the car.

 

Yes I believe you are right. I am trying to decide on taking it to Match or Pettit racing in South Fl. I think it is the plumbing to the selenoid based on other set ups I have seen here

 

I don't know if you put back those bolts that are missing from the compressor housing that holds it in place . In one pic, I can see one sticking out at the bottom.

 

Find a new mechanic.

A wastegate failure should never blow an engine because if a wastegate fails and boost isn't controlled so it rises too high, the ECU boost cut will be activated. Even a Microtech has a working boost cut feature. There is no reason this shouldn't be set.

 

he might be more worried if they are cheapo parts than just due to the more complexity of the dual wastegates. but i doubt that if it is an Aspec kit.

anyways, i'm only about 45 minutes from them but if you live in south florida there's already shops down there.

 

I know it's been a while but going to shoot this back out anyways. First of all thanks for all the responses and ideas. This in fact is one of the reasons I am in the rx7 forum. My wastegate are working great and the car is holding boost. I tightened a few of the conncters at the wastegate and the plumbing and bingo. All is good. Only problme is it spins the tires on a roll in second gear😀😀😀😀. Also my fuel mixture is super rich. Is tunning dual wastegate especially more complicated than single?

 

Bump

 

Is running dual wastegates more complex than single Wastegates? Just don't feel very good about my tune. Please chime in if you know something I don't. I would assume it's the same but he'll what do I know

 

Single or twin gates makes no difference to tuning. Both set ups do the same thing.

microtechs are a dog to get a nice tune out of.
you will get the power no probs but it will never be as nice around town as a bently or a lexus

 

Ok I guess I just need to more time running. I think my tuner/engine builder has the tune too rich. He is afraid that one housing is going to be leaner than another because of the dual wastegates causing a lean condition

 

Have you got a pic of your exhaust manifold and wastegate setup?