How to maximize your low end power on a T2 S5
09-03-10, 07:47 PM
#26
Im another one for the "not running right" crowd.
First off, before you ever start working towards improving the low-end on the motor, i'd suggest you do a complete maintenance job on the car.
Starting from the fuel system from the tank all the way to the injectors. Clean the injectors as well.
Spark plugs and wires
air filter(is it dirty?)
engine oil, tranny oil, diff oil(time to change all of them, more friction equals more power robbed)
vacuum lines(you may find a boost leak)
compression numbers
check for splits/leaks in couplers/tubes
get a boost gauge and see what its boosting at
DO EVERYTHING on a 60k+ mile maintenance job you can think of before trying to do anything else to improve low end.
If for any reason you still feel the motor is "too gutless" for your tastes, then its time to start saving for a complete rebuild to include brand new engine gaskets and any solenoids relating to the turbo and twin-scroll operation. rebuild the stock turbo or get a BNR turbo and even a LIGHTWEIGHT pulley set, NOT underdrive set, lightweight STEEL flywheel.
once that is all done only THEN, will you notice a much better low end on the car.
if you still cant get what you want... well then you can start looking into a shorter final drive.
First off, before you ever start working towards improving the low-end on the motor, i'd suggest you do a complete maintenance job on the car.
Starting from the fuel system from the tank all the way to the injectors. Clean the injectors as well.
Spark plugs and wires
air filter(is it dirty?)
engine oil, tranny oil, diff oil(time to change all of them, more friction equals more power robbed)
vacuum lines(you may find a boost leak)
compression numbers
check for splits/leaks in couplers/tubes
get a boost gauge and see what its boosting at
DO EVERYTHING on a 60k+ mile maintenance job you can think of before trying to do anything else to improve low end.
If for any reason you still feel the motor is "too gutless" for your tastes, then its time to start saving for a complete rebuild to include brand new engine gaskets and any solenoids relating to the turbo and twin-scroll operation. rebuild the stock turbo or get a BNR turbo and even a LIGHTWEIGHT pulley set, NOT underdrive set, lightweight STEEL flywheel.
once that is all done only THEN, will you notice a much better low end on the car.
if you still cant get what you want... well then you can start looking into a shorter final drive.
09-03-10, 07:49 PM
#27
neofreak had an S5 t2 back in the day that did more tq than HP on the dyno, it was like 220lbsft@3000ish, and it only did like 200-210hp something like that.
i think the only mod was the turbo back exhaust.
IMO its a waste of time to try and get more power under 2500rpms, you're only there in 1st gear...
i think the only mod was the turbo back exhaust.
IMO its a waste of time to try and get more power under 2500rpms, you're only there in 1st gear...
I believe he also got rid of the turbo and went with a Camden s/c and went with shorter final drive ratio, unless it was someone else.
09-04-10, 12:00 AM
#29
My S5 TII pulls hard below 4k rpm.
It almost pulls just like a 350z v6.
I have 90psi in all front, and 80psi in all rear faces lol.
I have a stock port engine.
When I had my 4.3 diff in last year, it pulled really nice. :P
I could see doing a custom intake with longer runners would help low end torque, but on a turbo engine, I doubt its going to do anything since the intake system is going to be pressurized, but it will probably help before the boost comes on.
On a turbo engine, theres nothing you can really do to the extent of maximizing low end compared to a N/A engine.
You can maybe custom a turbo manifold with longer runners thats more straighter and a little smaller in diameter leading to the turbo to maximize velocity towards the turbo to increase boost responsiveness in low rpm range.
The best mods I can see to maximize low end power or the usage of it is to get a higher ratio rear end, higher compression rotors, and stay on stock intake ports. Of course, lightening the car would help a lot also. With flywheels, just dont go too excessive with a lighter one. Too light and boost will have trouble building up in low rpm when shifting.
It almost pulls just like a 350z v6.
I have 90psi in all front, and 80psi in all rear faces lol.
I have a stock port engine.
When I had my 4.3 diff in last year, it pulled really nice. :P
I could see doing a custom intake with longer runners would help low end torque, but on a turbo engine, I doubt its going to do anything since the intake system is going to be pressurized, but it will probably help before the boost comes on.
On a turbo engine, theres nothing you can really do to the extent of maximizing low end compared to a N/A engine.
You can maybe custom a turbo manifold with longer runners thats more straighter and a little smaller in diameter leading to the turbo to maximize velocity towards the turbo to increase boost responsiveness in low rpm range.
The best mods I can see to maximize low end power or the usage of it is to get a higher ratio rear end, higher compression rotors, and stay on stock intake ports. Of course, lightening the car would help a lot also. With flywheels, just dont go too excessive with a lighter one. Too light and boost will have trouble building up in low rpm when shifting.
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