safe or not?
11-28-12, 04:33 AM
#1
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safe or not?
this post is regarding my plans to upgrade my 93 rx7 with 72k miles. i currently have exhaust and intake and i do have my down pipe and mid pipe ready to be installed.my question is, is it safe for my car to do all those mods without the pfc?or any aftermarket ecu? or fuel pump or new IC? thanks in advance!
11-29-12, 04:13 AM
#2
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I think you already know the answer to your question(s)....
Install the downpipe, but do not install the midpipe until you change your ecu. No fuel pump is necessary until you raise your boost level (which is not advisable on stock twins) or go single turbo even then you would want to change your injectors as well.
If you get an aftermarket intercooler I would suggest just getting the stock location type like the one Greddy used to make. If you go V mount or front mount with stock twins you will have turbo lag.
Install the downpipe, but do not install the midpipe until you change your ecu. No fuel pump is necessary until you raise your boost level (which is not advisable on stock twins) or go single turbo even then you would want to change your injectors as well.
If you get an aftermarket intercooler I would suggest just getting the stock location type like the one Greddy used to make. If you go V mount or front mount with stock twins you will have turbo lag.
11-29-12, 11:20 AM
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Thanks alot.i tested the mid and down pipe yesterday.i ddint like the sound.its too lound and coos here in san diego will defintly take their time and check my stuff.(rx7 sounds like harley motorcycle.).
11-29-12, 12:14 PM
#4
I think you already know the answer to your question(s)....
Install the downpipe, but do not install the midpipe until you change your ecu. No fuel pump is necessary until you raise your boost level (which is not advisable on stock twins) or go single turbo even then you would want to change your injectors as well.
If you get an aftermarket intercooler I would suggest just getting the stock location type like the one Greddy used to make. If you go V mount or front mount with stock twins you will have turbo lag.
Install the downpipe, but do not install the midpipe until you change your ecu. No fuel pump is necessary until you raise your boost level (which is not advisable on stock twins) or go single turbo even then you would want to change your injectors as well.
If you get an aftermarket intercooler I would suggest just getting the stock location type like the one Greddy used to make. If you go V mount or front mount with stock twins you will have turbo lag.
to compensate for the lag . should I not?
P.S. sorry for hte hijack , But I figured it may be relevant to the OP anyways
12-01-12, 12:06 PM
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Deffinately need the pfc before you run it hard with the MP. I had a friend in AZ that did not heed my warning. He installed the MP with his stock twins a fresh rebuild and stock ECU. He had no way to monitor his setup, a little boost creep, no back pressure from the old catalytic converter, and injectors running I'm assuming past 100% duty cycle makes one lean mixed ka-pow. Needless to say Apex seals we're gone compressor wheels got chewed up and it sat for months after only 2 days of being back on the road. But it does give a good reason for a complete tear down and rebuild, and you get to make things shiny again.
12-01-12, 02:49 PM
#6
I agree, stock fuel is fine with stock boost levels. And that's the key...keeping it at stock boost. That's why I also agree with leaving the mid-pipe off to avoid boost CREEP.
Be sure to understand the difference between boost CREEP, exhaust overwhelming the wastegate from too little back-pressure, and boost SPIKE, which is from the intake side. Both can result in lean conditions and cost an engine. The significant difference is that a Boost controller will only control SPIKE. It will not control CREEP. Regardless of whether your running the stock ECU or a PFC you can get CREEP. The only way to avoid it is to port the wastegate, which is a huge PITA since it's internal and you have to remove the turbos...or retain some backpressure in the system. A cat...even a hi-flow cat, is typically enough.
Since your car is relatively low mileage and presumably a streeted car, the other benefit of keeping a cat is that it won't **** your neigbors off every time you pull in to the driveway (quieter), and the exhaust stench won't make your eyes water.
I'd also consider having the downpipe heat-coated or at least header-wrapped before install. It really helps to reduce underhood temps.
Regarding your "intake', if you still have the stock IC, you probably don't have to worry about SPIKE. But if you reduce restriction anymore I'd be careful...especially on cool mornings or evenings until you have some form of boost control (manual or EBC). Especially on the stock ECU.
Be sure to understand the difference between boost CREEP, exhaust overwhelming the wastegate from too little back-pressure, and boost SPIKE, which is from the intake side. Both can result in lean conditions and cost an engine. The significant difference is that a Boost controller will only control SPIKE. It will not control CREEP. Regardless of whether your running the stock ECU or a PFC you can get CREEP. The only way to avoid it is to port the wastegate, which is a huge PITA since it's internal and you have to remove the turbos...or retain some backpressure in the system. A cat...even a hi-flow cat, is typically enough.
Since your car is relatively low mileage and presumably a streeted car, the other benefit of keeping a cat is that it won't **** your neigbors off every time you pull in to the driveway (quieter), and the exhaust stench won't make your eyes water.
I'd also consider having the downpipe heat-coated or at least header-wrapped before install. It really helps to reduce underhood temps.
Regarding your "intake', if you still have the stock IC, you probably don't have to worry about SPIKE. But if you reduce restriction anymore I'd be careful...especially on cool mornings or evenings until you have some form of boost control (manual or EBC). Especially on the stock ECU.
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12-02-12, 11:16 AM
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I guess time to buy a high flow cat.wife is complaining about that strong fuel smel that makes here eyes watery.plus car is too loud specially when cold start up.thanks for the info.
12-02-12, 06:08 PM
#10
^Probably. But just to make sure I'd stay away from wide open throttle (WOT) boost runs. As long as you keep to stock boost levels you're golden.
Yep. Have a friend who has a HIGHLY modded single turbo with a midpipe. I can't even stand to follow him on the highway,. And your eyes really do water...don't they. 
12-03-12, 02:31 PM
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^Probably. But just to make sure I'd stay away from wide open throttle (WOT) boost runs. As long as you keep to stock boost levels you're golden.
Yep. Have a friend who has a HIGHLY modded single turbo with a midpipe. I can't even stand to follow him on the highway,. And your eyes really do water...don't they.
Yep. Have a friend who has a HIGHLY modded single turbo with a midpipe. I can't even stand to follow him on the highway,. And your eyes really do water...don't they.
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