I want an EBC that can vary boost by RPM with a user programmable curve. is there such a product?

how much boost can the stock turbo build on a stock engine above 6500 rpm?

what im getting at is that i would like to add boost in a curve in an effort to keep cylinder pressure up at higher rpm's. i think this would make the car significantly faster, but im not sure if the stock turbo (or it's ancillary devices) are up to the task.

what if i wanted 35 psi at 7200 rpm? what would i need to do that?

thanks in advance

 

I have a box that sounds like it would meet your needs; its called an XEDE. It also controlls ignition timing and fuel ratios. It can do a bit more, too.

The stock turbo will max out with up top slight mods to the car. If you want big boost up top, you will need to upgrade your turbo and make the supporting mods.

 

erioshi, i read some dude's post (maybe he was crazy, but he made the idea sound legit) in which he said that the stock turbo is pleny capable of making big boost up top, but that the wastegate and/or (something or other part) wasn't strong enough to stay shut to build such an amount of boost.

and really, im not so much after boost as i am blower efficiency and real airflow. im new to turbo applications so pls bear with me... if the blower is big enough to make lots and lots of boost at high rpm (efficiently), is the downside for such a turbo the low-end of the game?

in other words, do you generally only get so much of a powerband with any given turbo? is it such that moving the powerband up gives you top end while sacrificing bottom end (like cam duration)?

thanks again!

 

Turbocake, what you have sounds about right, but it depends on the the turbo as well. The stock turbo is designed as a very good mid-range all around turbo. The punch is biggest from 3000-5000rpms, where the car just wants to keep on accelerating. As you get higher, the car seems to drop off for a number of reasons.

1) stock Evo runs too rich up top
2) the boost tapers to redline

These can be fixed by boost controllers and fuel controllers of course, but with regards to boost some argue that going beyond a certain pressure level does nothing for the car and only generates hot air. Every turbo has an efficiency range, and once you exceed that efficiency range you are doing nothing but generating hot air.

In theory to correct this lack of top end power you could put on a bigger turbo - but like you mention, this will sacrifice mid to low end. For some (especially drag racers), this is acceptable, but for the serious road racers the stock turbo so far appears to be the most well rounded solution.

And you are correct about the turbo's powerband. Each turbo has a unique powerband - given the nature of the turbo's operation, you can't always expect it to give linear gains across the entire powerband.

 

BTW, many products fit your description. Any stand alone or piggyback type ECU will be capable of mapping boost vs RPM (AEM, XEDE, UTEC, Autronic, the list goes on and on).

If you want a single solution, then I believe only the Apexi AVC-R boost controller allows you to do this. The Apexi does work rather well too, IIRC.

 

zstryder, thanks for the apexi info.

im not looking to do anything right now because of warranty concerns, but once the 100k mark hits, i want to make some more power.

in my opinion, the evo engine has a lot more left in it, especially up top. id like to do whatever i can to keep torque up in the higher RPM's. Doing this with boost seems to be the most practical way.

if the torque curve were flatter and lasted longer, the HP would go way up because of the relatively high RPM the engine is already capable of. building cylinder pressure at high RPM just takes (efficient) boost.

 

JUst get a Greddy E-01. THat's what I do. That way I can hold boost flat all the way to redline.