I had this posted over in the Prelude forum and I thought I would share this set-up with you guys. It's not everyday you see this type of NA build in a 5th gen prelude.

Specs
-AV Tuning & Development Stage 5 Stroker Engine (90x95mm)
-Custom designed CP Pistons for application (12.5:1 c/r, dome-strutted, lateral gas port, CP Full groove gas port, pro wrist pin, etc) and Carrillo Super-A light weight rods
-AV Tuning & Development Stage 4 Cylinder Head
-Skunk2 Pro3 Cams, valves, Pro Series Valve Srings, Pro Ti Retainers, etc
-AV Stage 3 cylinder head
-AV Stainless Steel 3" Exhaust
-Hytech Header
-TWM 52mm ITB's and air box
-Hondata S300
-Injector Dynamics 725cc (<---GREAT INJECTORS)
-AV Stage 3 Traction Bar
-TONS of other stuff

The customer wanted to make reliable power on pump gas with this set-up so we sat down and did our homework with the cam selection as well as piston design. A lot of guys think high compression is the only way to make big power... that's not 100% true. Granted, had we gone with something along the lines of 13.5:1 - 14.0:1 power we could have easily made MUCH more power but then you could kiss running pump gas goodbye.

This set-up should make a very competitive track with the right suspension modifications. We are leaving the tune on 93 octane per the customers wishes but with race fuel I predict a gain of 14-20ish whp/tq. This engine lovesss timing and made a tad bit more than the dyno chart that's posted but reliable power is much more important than big numbers.















EDIT 1/13/10

We got the car back on the dyno this afternoon. It was brought up that the air box robs power... and it does. I did not spend a lot of time tuning without the box because the customer HAS to run the intake if he doesn't want to see IAT's of 180 Deg. With box removed we picked up a good amount of power. The vtec engagement point needs to be lowered around 300-400rpms and the a/f's could be leaned out a tad bit. These numbers are pretty much only good for bragging rights. The gain in midrange is very impressive. This engine needs more timing but we are limited to 93 octane on this engine.

 

damn thats some great numbers.

 

very nice -- that is a great build !!!

 

Did you have the TWM airbox fitted as we found it lost power on our B20Vtec build the airbox has no where near enough volume for anything more than 160hp.And that is a nice engine build good job guys.

 

K killer lol

 

Thanks James.


On the 270whp and 272whp pulls we had the airbox on. On the 281whp chart we had it removed... read the notes on the bottom part of my first post about having the box removed. The box definetely restricts power... but it is a must on the street.

 

Very nice! That is a great looking torque curve.

The size of the TWM box is the restriction. A larger plenum could be made to support the airflow. I would imagine a 4L to 5L airbox with a 4" inlet would be ideal. I like the idea of keeping an airbox for lower IAT's and better filter options, since it is a street car and all.

 

wow, you guys managed to get 210 ft/lbs using an h-series tranny. now that's an accomplishment!

 

I love the powerband of this engine.Look the gain whitout the air box.Your customer want to try another kind of im?

 

Shame its in a Lude

Needs to be in a hatch

(Prepares for lude owners objections)

Great work....custom crank or mod'd OEM?

 

Yea... it does need to be in a hatch, lol. Mod'd OEM.

 

Now thats an amazing build.
Wish I could just pay someone to build me a motor like that.