This is a lapping car, just looking for more torque low down. Will retune with a S300 or other. I think it's pretty solid but open to any suggestions to improve torque in the 4000-8000 range.

Relatively simple build:
USDM GSR block decked ~0.005"
USDM GSR Head decked ~0.002", Mild P&P
RS Machine ITR Pistons (USDM copy) 81.5mm
Skunk2 Pro 1's degreed @ +4 exhaust, +3 intake
PerformerX intake manifold
AEM 3" CAI
TDM hytech knockoff header
S2 Megapower R catback
RC370's
Tuned on a Power FC

Motor was just tested for leakdown, <4% on all cylinders. Thinking of switching to RDX injectors for a better spray pattern.

Thanks in advance!!

 

LS crank or a stroker crank if you have the money

 

Check out my thread: https://honda-tech.com/forums/showth...7#post42504267

Engine mods are there...and I was tuned on the EXACT same dyno. Nick did my tuning with Crome.

 

Thanks guys!!

Should have been more specific, don't really wanna open the motor up again. Keep the suggestions coming.

 

Our motors are very similar...I'm surprised you aren't making more power.

I'm also using USDM GSR block and head. I don't think they are decked/milled at all with a three layer head gasket. I'm also using RS machines ITR pistons. I also have a PerformerX intake manifold.

I'm using the stock throttle body still, stock injectors and an OLD tired fuel pump. I have a generic intake arm (3" I believe) with a dirty K&N at the end. I'm using ITR cams. I'm using a narrow, long tube 4-2-1 header with 2.5" collector. My cat is gutted. I'm using a 2.5" BuddyClub ProSpec exhaust.

The only things that are different between our two setups that would affect power are my LS crank/rods, my intake arm, and my exhaust. You have bigger cams. As I said, I'm surprised you aren't making more power...it must be the exhaust.

 

I'd use the LS crank as well. No replacement for displacement.

 

I crossed 125wtq at 4500rpm and stayed above that all the way to 8000rpm.

My set-up is very similar to this. But NO LS crank. I was also on a DynoJet, very hard to compare. I also have a Performer X I/M. One thing I had found with a little smaller IM, Skunk2 Pro we might see an increase down low but might lose a little up top.
Do you have a V-stack on you Intake pipe?
Look into FIC525 injectors also. Isn't a Power FC a piggy back unit?

I will be starting a post later today "Quest for the final 10whp, 200whp here I come" these should be my final steps to 200whp with OEM internals.

 

If you don't want to open it up I would suggest the following
1. Change the injectors. Most of this will be in the top end, the improvement is not across the board. As the rpm increase so does the power increase with the Bosch type injectors.
2. Add a BPI Velocity stack.
3. Retune with Hondata, Neptune, Ectune, Crome, piggy-backs are not as good.

 

Power-FC is a stand alone, not a piggy back. Plenty good for his setup

 

I stand corrected. I read the entire Apexi site. Stand alone it is, and really expensive.

 

stumpyf4 if you don't mind me asking what is your max duty cycle on the RC370's? Mine are at 68% on my ITR cams.

 

only other suggestions is play with intake length and width, and maybe smaller exhaust? would that help..?

 

i would say maybe a custom intake manifold with tuned length runners. but by the time you spend that money you can throw an LS crank in there and be much simpler

 

What's the rest of the setup of the car? Instead of looking for more power, how about gearing change or weight reduction in the car?

 

The only other way to make "torque" from the current setup that you have is to change the final drive to a 4.785 or even 4.929. It doesn't show on a dyno, but trust me, that modification is enough to go after some turbo cars. I use a 4.929 myself.

Power FC FTW!!!!



An example of the 4.929 Torque multiplier final drive
http://www.youtube.com/watch?v=Qg_BzDZjHoA

My wife's car with the final drive.
http://smg.photobucket.com/albums/v2...t=DSCF9736.flv

 

jenvey itbs will pick up power and torque. a better header also would work.. skunk2 megapower header had a better low end than the hytech copy on an engine dyno with a 2 liter.. the kidracing narrow header actually worked well for the range youre looking for..

 

You may have to go back to a GSR Manifold. I know sacrilege. The GSR manifold would have to be heavily ported and polished, 1mm to 1.5mm larger butterflys. Port matched before and after the butterfly plate. Get a 65mm to 68mm TB, port matched to the manifold.
I ran a PnP'd GSR manifold with the stock size butterflys, it made gains from 2200-7000, biggest gains from 4000-6000, 6-8wtq.
When I changed to the Performer X and lost 20wtq down low I almost changed back to my GSR manifold. A lot more tuning narrowed the loses down low, still not the same as with my GSR manifold. I have thought about this a bunch.
But like 1.5Slowmatic said it will cost a bunch to get a custom intake. My GSR PnP'd I think was about $350, and if I need more work done maybe another $350. $700 for an intake that will get you what you want or a 89mm crank and rods. What to do? Good luck

 

WOW Thanks guys!!

My exhaust:
TDM hytech copy, test pipe, S2 Megapower R (70mm). Better header would definitely make a difference, I had remove quite a lot of material to gasket match the TDM. I think I'm gonna hold out for a premium header.

Don't think the Megapower R is holding me back, every car I have seen has made more power by dropping the exhaust so I'm not about to go to a smaller exhaust.

Haven't looked at the max duty of the with the RC370's but the reason I'm looking at switching them out is not because they're maxing out but better spray pattern.

Tranny is a USDM ITR, untouched. A 4.785 or even 4.929 final drive may be the ticket, thanks TheShodan!!

Anybody do any cam tuning with the Pro 1's? If so what did you find?

 

I know the Bosch injectors have a better spray pattern. I am changing my RC370's to FIC525's I was just curious.

 

Did you try playing with the cam timing gears? If you advance the intake cam so that the intake valves close sooner, you should see a boost in low RPM power.

 

that race is brad from RLZ's itr or marshalls.. lmao that video alone inspired me to get a 4.9 and it was worth...every...single..penny.

 

you could also try some RDX injectors instead of the Bosch if your looking for a good deal.

 

The change of injectors is not going to make any additional torque. Timing gears would help with small amount of power if on stock cams, but not torque.

 

How does it help power, but not torque?

 

pmed you with a question.