rx7_88turbo2

iTrader: (4)

I have a 88 TII and i put an apex'i Dual N1 exhasut system last week. After i put the dual N1 exhasut, my boost dont go up as far as before, it bounce up and down very slowly. i dont feel the power as before. What is the problem with my dual N1? Does anyone has an idea? does anyone who has the same dual N1 has same problem? Thanks for help me out guys.
mike

DJChunter

most likly your hitting fuel cut.. get a FCD for $95 or do a search for a DIY one and that should fix the proble,..
Dave

Ryde _Or_Die

Ya what boost gauge do you have? What mods altogether?

rx7_88turbo2

iTrader: (4)

i have apex boost gauge. I already have FCD and SAFC.

rx7_88turbo2

iTrader: (4)

i have apex boost gauge. I already have FCD and SAFC.

gsracer

Try to be a little more specific and maybe we can try and pin point it down. I assume you mean the car ran and boosted just fine prior to putting on the dual n1 exhuast? If your boosting less after putting on the catback than obviously something is going on. My number would guess would be a clogged cat. Does this have anything to do with putting on the catback? I don't think so, it's just one of those things that happens to 15 year old cars. Do you have emissions testing where you live? If not just punch out the cats and clear all the honeycomb crap out of there, although I'd wear gloves since the stuff inside of there is supposed to be carcigenic.

What boost levels are you currently seeing, and what were they before the exhuast? When you say it bounces up and down, do you mean the idle, or the boost, I'm a little confused by that statement so maybe you can clarify. As of now I would guess clogged cat.

rx7_88turbo2

iTrader: (4)

I have a stright pipe, no cat. The boost bounces up and down while it is boosting.

nonameo

hrm... if you put a gasket on wrong it could cause the air to cavitate in your exhaust pipe? a long shot....

DonaldC

iTrader: (20)

How is the condition of your clutch? I had a similar problem with a turbo II I had. I was boosting about 5 to 6 psi then I added a full turbo back racing beat exhaust and then the car only boosted to 4 or 5 psi. Come to find out, it ended up being a slipping clutch. The clutch was slipping because of the added power, causing less resistance on the engine which was causing less boost pressure. I have seen this happen on some friends cars also. Good luck.

rx7_88turbo2

iTrader: (4)

i am sure it is not my clutch. coz i already put a new clutch.

importboi22

if the boost isnt steady its usally becuz you low compression sorry i would do a compression test it takes about 10 mins you need to have someone else help you too... series4 with a stright exhuast and stock wastegate size is asking for trouble

dr0x

Uh, not true at all. My blown motor held perfect boost in 1st, 2nd and 3rd. My rear rotor is completely dead (not 1 seal left in it).

importboi22

no no if you have no compression at all it wont affect boost but if its low compression it will i dunno how to explian it but the pulses are different patterened now like strong weak strong weak.... not like strong nothing strong nothing... see what im saying? its hard to explain but all the 13bts that ive seen with shakey boost have had low compression on one the rotors

dr0x

The s4 manifolds combines the exhaust pulses before the turbo anyways. So that kills that argument.

importboi22

oh ok... didnt know screw s4's! well the manifolds and such.... and dr0x do you ever you know..... sleep? i swear your always on!

dr0x

I usually dont close stuff when I leave my computer, browser refreshes every 15 minutes automatically

importboi22

no need to lie to kick it dr0x!

Josepi

How many miles on the turbo itself? Have you checked for exhaust leaks around the turbo/manifold area?