7-sins

Running a DP & MP w/o fuel inrichment? I need to get a DP & MP because i'm thinking it will fix my 2nd turbo problems but don't have the cash for a Apexi PFC. Is there any other fuel inrichment that could get me by for now? Also does anyone think that the backpressure from a clogged cat would screw with the secondary turbo.

Thanks for any help,
Chris

KZ1

forget the mp, that rearely will fix boost problems. Get the DP, and you will be cool. I am assuming you have no other mods. Mind you, i fyou haev been running with a bad Dp for awhile it harm you mp.

what is your boost pattern?

capt. bill1

I don`t understand how a DP and MP can fix a second turbo problem. What is the nature of the problem?

7-sins

yeah i wasnt too sure how it would fix the problem... my first turbo spools up fine but then boost drops off after 4500. So I guess my curve looks like 11-8-0. I only have a catback and K&N drop in. The last engine overheated so maybe it heated up the pre-cat to where all the crap inside just flew out. I have searched for vacuum leaks.. no luck.. This guy posted how PFS put a midpipe on his car and it boosted fine. I was pretty sure he had the exact same problem as me.

Edit: Just got the car back in July with the brand new engine... boosting like this from the beginning. I kinda had a feeling but didn't have anything to go off of untill I got the boost gauge.

Ryan95

iTrader: (10)

a DP and Midpipe with your air filter is begging for a new engine.
You'll most likely be seeing 14PSI and higher on cold days...
And it's not going to fix your problem, sounds like a dead turbo to me, a vacuum leak or bad solonoid would at least get some boost.

yomamasmama

check if your second turbine wheel spins, remove metal intake piping to the second turbo, you have to jack your car up

dp and mp will not fix your boost problem, and without a fuel upgrade you'll be looking for a new engine, I've seen my boost hit 14 psi with just those mods

GsrSol

Maybe a crossed vaccum line??

7-sins

I was thinking maybe a crossed vacuum line or bad check valve/ solenoid. I just have to take the time to look one night.

yomamasmama,
If I pull of the metal intake piping and start the car the 2nd turbo should just be spinning at idle?

I really hope it's not a turbo... I learned that I do not have a warranty now If I need a new turbo I might as well just save up for a single.

yomamasmama

dude, don't need to start the car, just see if it even spins

do a search on the forum for a manual, if you can not find it I'll e-mail it

check robrinettes site on link for trouble shooting your turbos, look at the vacuum line diagrams, insure that they are connected properly and none of them are cracked

did you do a vacuum hose upgrade? if not, now is the time, you can learn so much **** and be confident of what you can do after doing it yourself

i think, it's part of the initiation of owning an RX-7

g/l

yomamasmama

oh yeah, check if the 2nd turbo spins in the first place, it would be pointless to check all the vacuum lines if something is wrong with your turbo

you don't need to boost

use your finger to spin it (do not start the car!)

rxheaven

make this job alot easier on yourself than you are now. I had the exact same problem. It was terrible. Good primary boost and no secondary. The problem cost me about 60 cents to fix. Get under your car and look at the turbos very carefully. You will see the actuators and the rods that go to them. There is a hole in the end of each rod, to which a pivit type thing goes in. at the end of the pivot type thing there is a nipple sorta thing. It goes in the whole in the rod. The is an e- clip that hold all of it together. I was missing the e-clip. If this is missing you will see no secondary boost because the actuator will not open and let you get secondary boost. Look there first. ITs a cheap fix if mazda didnt put the e-clip on like they did on my car. Let me know if this helps at all

7-sins

rxheaven,

I'm pretty sure the clips are in place, I can check one more time though.

yomamasmama,

I'm going to see if the turbo spins as soon as I can... If it does then I might do the ty-wrap job myself.... ugghh looks like a huge pain but it does need to be done. Will I need to buy a new gasket when pulling off the upper intake manifold?

aReX-7

iTrader: (3)

hey 7-sins,


I just got done fixing my second turbo problem. The main cat was involved with my problems. However, there were other problems as well.

The problem with a plugged or partially plugged cat/pre-cat is that as the air flow increases, the resistance will increase even faster! Try blowing softly through a small vaccume hose. There is not much resistance if you just blow alittle. But if you try to blow alot of air through the same hose, you will feel alot of resistance. Remember that the function of the second turbo is to create the same pressure as the first (12 psi), but with much larger volumes of air.

Bottom line, if you have a plugged cat or precat, the efects will show up much, much greater with the second turbo since it is creating much more exhaust.

Now, let me say that I agree with Ryan95 that if you put on a midpipe and down pipe with intake and catback, YOUR ENGINE WILL BLOW UP! This would not be a good move.

Check out the post I put up alittle while ago under "Boost problem fixed". It details all of the things that I found wrong with my car that fixed my problems.

yomamasmama

everyone is giving you pointers, try them all

someone mentioned in the forum that we use compressor gaskets, once you tighten them down they compress to form a good seal, only good once

but as for me, i plan upgrading slowly and pulling all that **** off everytime i mod, so gaskets can be $$$ in the long run,

i'm a cheap bastard, so i just reuse them, i had an exhaust leak when i put on dp and mp but was fixed using some additional silicone gasket maker

when i'm all done playing Dr. Frankenstein, that's when i'll get new gaskets