If I would like to add more power to my Evolution VIII how much does lag come into play?
I have read that bigger turbos are not as “streetable”.
Does that just mean you need to spool a little higher or is there more to it?
I don’t mind winding her up to get more power if that is the only reason.
At this point I think I have tapped out the 2.0 with the stock turbo unless I install some type of system that requires refilling.
The only thing I want to fill is the gas tank.
Even though it takes more rpm to get to the peak power doesn’t the turbo/engine have a little more low-end power to start with?
In other words, I have seen charts that show 500hp up near 7000-8000 rpm BUT, at 5000 rpm the engine is putting out more power than 300hp so even with “lag” the car is still putting out good power.
I realize there are more factors than just the turbo itself but in general does the lag really make the car “slower” at lower rpm?
Can someone with tuning and or big turbo experience chime in?
Thanks in advance.
PS: For anyone following the sale of the car; I have decided to keep it for now.(unless I can get more money for it.)
Its pretty easy actually, the bigger the turbo you go with, the more lag you will have. Lag will make your car slower at low RPM, you lose the power down low in place of big gains up top. It all depends on how big you want to go.
There is a “stock replacement” turbocharger available from Forced Performance that we could get you, but for the price you could just as easily upgrade to a larger turbo such as the FP3052, or 3065. This all depends on what type of power you are looking to make.
You can take a look at the stock replacement turbo here called the White Rabbit.
If a car has a peak of 350hp at 5000rpm and you add a turbo that has 550hp capacity on the car at 7000 rpm wouldn’t you still have about 350 at 5000rpm?
My point is the peak is so much higher that it would have at least that power at lower rpm.
Or would the car only have 250hp at 5000 rpm with a bigger turbo?
Does the car gain 300hp between 5000rpm and 7000rpm?!?
Again I realize there are other factors.
Assuming you are just going to bolt on a turbo and not change anything else, and that your stock turbo is pretty effiecient, you will start to lose power at lower RPMs as you bolt on anything bigger than your stock turbo.
For example if you just bolted on a bigger turbo to net you 200 hp, your probably going to lose power down low <4000 RPM, but wherever the new turbo will hit full boost (say 5000) you will be above your stock turbos hp.
The best way to choose the right turbo, is to check you dynos graphs with similar cars with a turbo you are considering, and see if you like the powerband it delivers.
yeah poopra explains it well. Just remember that ur turbo now is small and that means its very easy for your motor to get it spinning. If you put in a turbo the size of a gorillas head, its gonna take so long for it to get spooling that you will never make power. Its kind of a trade off. And as you can see the reason why big turbos arent as streetable is because they take a long time to spool and therefore are dogs to drive.
