Well hello to every one...

I have read some of the threads that this forum has aloready but I did not find out something that will get close to our problem...

I live in Guatemala City, Central America and I work as JDM Car Importer here in my country, so I sell an FD3S Type-R Rx-7, year 1993.

Th car is in excellent condition and compressions, but the car has some boost problems.

When you go on a ride you can get to 9,000rpms in 1st gear, then change to 2nd and the car is running incredible but when it gets to 5,200rpms the car simply DIES....
It will continue to run if you change to 3rd Gear, so we do not know what would be this problem...

The car has an Apex´i Boost Controller AVC-R, Kakimoto Full Exhaust System, Stock ECU, Stock Fuel Pump,...

Does anyonne have an idea of what the problem could be...??? A mechanic said that the trouble could be the wastegate, but how can we tell this...???

Another problem is that some times the car is running normally in normal speed 45mph and it starts to loss power, like he is running out of fuell... We tried to search for the fuel filter but did`nt find it out...

Thanks for all your help...

 

First thing, I would do is put a boost gauge on the car and see what readings your getting.(boost/vacuum) It a simple process of elimination that a boost gauge can be used to define a problem. I would do this before giving you a ton a things that COULD be wrong.
BTW, what are the compression readings

 

does the car die, or does it buck? ... and do you have a downpipe and a midpipe?? you most likely would need to upgrade your fuel system and the Management system...

 

Thanks for your answer, I will install a Boost Gauge to the car this weekend; we were using the Boost Gauge Function that the Apex´i Boost Controller has, but everyone saids that is better if we install a mechanical one.

I will tell my friend to giv me the compression readings so that I can post them here, he is out of town right now because of some ilness of his Grandmother.

Thanks for your post.

 

The car dies, it completelly gets out of power, just like it was turn off...

The car has a downpipe, presilencer and muffler...

Any ideas to upgrade the fuel system..???

 

If you were loosing boost and it seems to randomly boost you might check the sylinode chips

 

I have not idea what you are talking about.

The fuel filter is a good place to start. Its located above the rear differential. Its kind of a pain in the *** to change but I would check it regardless to be sure its not plugged and is in good condition.

Is the MIL light on and does the car seem to idle ok? When you switch into third gear does the car rev past 5200 rpm or does it cut out like it does in 2nd gear?

 

2 of my chips went bad in my Fd3, which caused random boost, and sometimes I got 0 boost past 5000 rpm. I believe there's 8 chips within the engine? The chips supposely control the boost.

 

 

What the hell are you talking about chips for???

 

I think you meant to say "solinoids" instead of chips.

R.K.

 

can you even bring 1st gear up to 9 grand without hitting the rev limiter??? did you raise the rev limiter or something??

 

You need to first figure out how much boost it makes. Install a boost gauge temporarily at least.

The stock ECU has a fuel cut device that will stop feeding fuel to the engine when it sees too much (12psi) boost. With a stock ECU, it should not be tuned for any more than 11psi. It could very well be reaching more boost than 12psi because of the full exhaust, and 5200rpm is about where it may see the fuel cut. Using fuel cut is a very bad practice, so once you figure out what the problem is you need to use the boost controller to tune it for 10-11psi again.

If this full exhaust system does not have any catalytic converters, you will probably not be able to hold a stable maximum boost with any controller setting - this situation is boost creep. You will then have two choices: add restriction (replacing the midpipe with a high flow cat is a really good way) or take off the turbos and port the wastegate the the maximum size for the flapper door. With the larger wastegate the controller should be able to control the boost consistently.

If you intend to mod the car to support higher boost, then you would need to change the ECU and fuel system. But first you should get this running properly.

Dave

 

I think you meant to say solenoids instead of solinoids.