S5 Turbo Build Questions!
08-27-07, 03:00 PM
#1
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S5 Turbo Build Questions!
Hey, I am new to the forum, and I have been reading through, and it seems like you guys know your stuff, so I am gonna ask away!
Alright, I am helping my friend out with his car, which is a 1991 TII, recently rebuilt with strong apex seals, and a mild street port. He also has a catless downpipe, but other than that, the car is STOCK. We hooked up a boost gauge to it, and the car was only seeing 3-5 PSI of boost, which seems low for the car. After taking it to a mechanic, he said the turbo needed to be rebuilt. Right now, he is looking at going with the BNR stage 2 or 3. The goal is to run 14-15 PSI and 320-350 RWHP. I do know the injectors will need to be upgraded, and possibly the fuel pump as well.
My questions for you all is:
1) He was thinking about going with a Rtek, but they don't have anything made for the S5 yet, so what other options are out there for him? Neither of us have the ability for a megaquirt, and the only other thing I would think of is a piggyback setup, but which would be your best recommendation?
2) With that kind of boost levels, I don't think that the stock IC will be a good fit for it, so I am sure an FMIC will be in order. How many people have bought them and how many people have built them? Also this is an A/C car and he NEEDS to keep it that way (New Mexico summers are NOT fun at all).
I appreciate your help! I am a Mustang guy mostly, but I appreciate speed in all forms, even if you don't have things like camshafts and valvesprings ;-).
P.S. We have taken the car to the track one time, and it has run a best of 15.3 at 91 MPH, with a 7800 ft Density Altitude (hot day, mile high to begin with, not the best for record setting times
)
Alright, I am helping my friend out with his car, which is a 1991 TII, recently rebuilt with strong apex seals, and a mild street port. He also has a catless downpipe, but other than that, the car is STOCK. We hooked up a boost gauge to it, and the car was only seeing 3-5 PSI of boost, which seems low for the car. After taking it to a mechanic, he said the turbo needed to be rebuilt. Right now, he is looking at going with the BNR stage 2 or 3. The goal is to run 14-15 PSI and 320-350 RWHP. I do know the injectors will need to be upgraded, and possibly the fuel pump as well.
My questions for you all is:
1) He was thinking about going with a Rtek, but they don't have anything made for the S5 yet, so what other options are out there for him? Neither of us have the ability for a megaquirt, and the only other thing I would think of is a piggyback setup, but which would be your best recommendation?
2) With that kind of boost levels, I don't think that the stock IC will be a good fit for it, so I am sure an FMIC will be in order. How many people have bought them and how many people have built them? Also this is an A/C car and he NEEDS to keep it that way (New Mexico summers are NOT fun at all).
I appreciate your help! I am a Mustang guy mostly, but I appreciate speed in all forms, even if you don't have things like camshafts and valvesprings ;-).
P.S. We have taken the car to the track one time, and it has run a best of 15.3 at 91 MPH, with a 7800 ft Density Altitude (hot day, mile high to begin with, not the best for record setting times
)
08-27-07, 03:56 PM
#2
Sounds like the turbo could be Ok
I would say gut the cats or add an exhaust system. You will see boost increase.
Maybe if the cat was clogged it could only boost to 5lbs.
The stock fuel system is setup for 7.5 lbs of boost. Anything more than that and you should upgrade the fuel. Some people don't upgrade but you run the chance of blowing the engine.
If you were at sea level how fast would your 1/4 mile be? I would guess 14.5?
Sounds like the car is running great. Check those cats!!!!!
check ebay for a FMIC. Cheaper
Clean out the A/C rad/cond and upgrade the stock rad to a KOYO.
I would say gut the cats or add an exhaust system. You will see boost increase.
Maybe if the cat was clogged it could only boost to 5lbs.
The stock fuel system is setup for 7.5 lbs of boost. Anything more than that and you should upgrade the fuel. Some people don't upgrade but you run the chance of blowing the engine.
If you were at sea level how fast would your 1/4 mile be? I would guess 14.5?
Sounds like the car is running great. Check those cats!!!!!
check ebay for a FMIC. Cheaper
Clean out the A/C rad/cond and upgrade the stock rad to a KOYO.
08-27-07, 11:19 PM
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Well, the car currently has NO cats on it. It has a JDM downpipe and a piece of pipe connecting to the catback with no cat, so, no cats lol. It was actually converted to this after the car only saw NO boost, and the cats were pretty much sealed shut with crap. Any other ideas why the car may not be boosting?
Using an online calculator, the car would run a 13.8 at sea level, with a trap of 100, but that is using a calculator going to a DA of 0, so I wouldn't take that as an actual time. I would say at a lower altitude it is definitely a mid-low 14 second car.
A/C and everything has been cleaned recently, the car had to go from New Mexico to virginia, and had everything looked at to be in good working order.
Do you know if it is hard to do custom plumbing on an FMIC on a A/C car? Seems like that compressor is RIGHT in the way...
Also, any ideas on what to do for tuning?
Thanks guys! I really appreciate the help!
Using an online calculator, the car would run a 13.8 at sea level, with a trap of 100, but that is using a calculator going to a DA of 0, so I wouldn't take that as an actual time. I would say at a lower altitude it is definitely a mid-low 14 second car.
A/C and everything has been cleaned recently, the car had to go from New Mexico to virginia, and had everything looked at to be in good working order.
Do you know if it is hard to do custom plumbing on an FMIC on a A/C car? Seems like that compressor is RIGHT in the way...
Also, any ideas on what to do for tuning?
Thanks guys! I really appreciate the help!
08-28-07, 12:07 AM
#5
on a BNR stage 2 or 3 you will need big enough injectors that piggybacks won't work. it won't be able to handle injector transition with big secondarys (over 720cc). you are also getting close to the limit of the stock airflow meter
that leaves you with megasquirt, haltech, microtech, and Power FC. Power FC is pretty much plug and play provided that your harness is in decent shape. It will require either the AP engineering unit or the Banzai adapter kit, both of which make an FD unit work on an s5. Either way i'd expect $1000 at least.
also check your boost control solenoid
that leaves you with megasquirt, haltech, microtech, and Power FC. Power FC is pretty much plug and play provided that your harness is in decent shape. It will require either the AP engineering unit or the Banzai adapter kit, both of which make an FD unit work on an s5. Either way i'd expect $1000 at least.
also check your boost control solenoid
08-28-07, 12:18 AM
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With the stage 2 or 3, would the fuel system be able to handle around 6-7 PSI before the computer could be dealt with?
And I like the look of the Power FC, including it can also be used as a boost controller (if I am reading it correctly). But lemme see if I understand this correctly: The power FC can plug and play into the s5, but with the use of a converter from and FD to an s5? and it will take care of the fact the stock airflow meter is maxed?
And can you send me a link to the AP engineering unit or the Banzai adapter kit?
And I like the look of the Power FC, including it can also be used as a boost controller (if I am reading it correctly). But lemme see if I understand this correctly: The power FC can plug and play into the s5, but with the use of a converter from and FD to an s5? and it will take care of the fact the stock airflow meter is maxed?
And can you send me a link to the AP engineering unit or the Banzai adapter kit?
08-28-07, 07:00 PM
#7
Banzai Racing
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08-28-07, 07:31 PM
#8
on a BNR stage 2 or 3 you will need big enough injectors that piggybacks won't work. it won't be able to handle injector transition with big secondarys (over 720cc). you are also getting close to the limit of the stock airflow meter
that leaves you with megasquirt, haltech, microtech, and Power FC. Power FC is pretty much plug and play provided that your harness is in decent shape. It will require either the AP engineering unit or the Banzai adapter kit, both of which make an FD unit work on an s5. Either way i'd expect $1000 at least.
also check your boost control solenoid
that leaves you with megasquirt, haltech, microtech, and Power FC. Power FC is pretty much plug and play provided that your harness is in decent shape. It will require either the AP engineering unit or the Banzai adapter kit, both of which make an FD unit work on an s5. Either way i'd expect $1000 at least.
also check your boost control solenoid
Definitely go FMIC.
If your friend can afford it the definitely go with the standalone otherwise the piggybacks should be ok for 720cc injectors.
You can always buy a decent core from ebay and custom make the pipes so you can keep the AC or go with the oldschool Greddy kits. I don't know if the new kits are good for AC cars.
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