How do some people get a flat curve? Is it all in the tune? Would love for some of you to share some insite and your set ups on the subject!

 

nobody?

 

im trying to battle this now.
one important thing is a good boost controller. i went from 26 psi to 22psi close to redline- you would want a boost controller to hold boost throughout the powerband.

this is why im getting rid of mbc and trying my old ebc from my honda possibly- that held 18 lbs all the way to redline.

 

ha. love your sig..................roofies!!!! i was thinking about a ebc......

 

I would say right off the bat from looking at your mods, flat curve is not necessarily what you are shooting for... but, here goes...

(All Stuff you already probably know)

Displacement, Quick Spool, and a Boost Controller that can hold the boost... (and, not having any vacuum/boost leaks helps).

Those 3 above all feed into each other... the key is to find the right sized engine (2.0, 2.3, 2.4... and, they even have a 2.6) for your turbo setup... and vice versa.

Big turbos/comparatively small displacement cause lag, the more lag you have the steeper the slope you'll see on a dyno graph as the power comes on... on the other end of this, a 2.4 with an '03 style stock turbo's graph would probably look like a supercharger's graph (instant power), but you'll sacrifice up top... likewise, if you have a crappy MBC that can't hold boost, you'll taper harder up top, and lose power in the high RPMs... it's all about finding the right combo for your goal...

The larger the displacement/quicker the spool... the flatter the curve.

 

^like I said, stuff you probably already know... I'd consider a 2.4l, if you have the cash... it'll help spool that FP Black you are rockin

 

Flat power or flat torque, pick one. The main thing is timing and MIVEC if equipped. Boost is secondary but depends on overall torque goal and airflow level.

 

Flat torque-



Flat power-

 

Aaron, for kicks and giggles, what cars produced those graphs? How were they built?

 

what he said ^

 

thanks everyone, and Aaron for the graphs......i know part selection is part of the equation, i just didnt really know much about this subject. i would love a nice flat tq curve!!!

All this stuff is very interesting, it would be nice to see some more graphs and what mods were done and any relative info to achieve that curve............is that asking to much? haha!

it seems ive ready every thread on here lately and looking for something new to read up on!!!
thanks again everyone

 

Arron has the best tuning skills for flat tq curves and fast spool using the mivec.The tuner can adjust it with * some know how to do it and others don't...And by the way the graph with 575 whp is arrons stock block evo on 92 oct that ran for 4 years with no ill effects.

 

The first one is my car with every bolt on part + S2s, ETS3586, and a Magnus.

The second one is a IX with S1s, a Red, and bolt ons.

Both were stock IX 2.0L motors using a Hallman MBC. Mine was on SD, the bottom one was a MAF.

 

Flat and wide torque curve is what you want as it will extend your power band and HP along with it. Two ways to do it. Easy way is to make sure your turbo is flowing air to redline. Not necessarily boost pressure perse but actual usable airflow. Sometimes you can maintain pressure but the air is sooo hot that it's not really making much power up top. Secondly, cams. A good set of cams will extend the torque curve and it will drop more slowly than a stock camshafts equipped car. They also usually raise your peak power point which is nice.