Specs on my set-up:

B18C1 motor fully rebuilt to stock/factory specifications.

Go Autoworks street kit which includes (precision 4831B journal bearing turbo, 2.5" DP, 2" hotside / 2.5" coldside IC piping, cast manifold, Tial 38mm WG, Tial 50mm BOV)

Precision 650 injectors, Omnipower 3bar map sensor, walbro fuel pump, tuned by Servion on Hondata S300.

I'm also running a 2.5" testpipe and Greddy 60mm exhaust.

Tuned at 14psi and made 258whp, ~190ft lbs of torque. Currently running 11 psi via Tial springs.

I'm in the Denver metro area so we're over 5280ft elevation.
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At 11psi I'm roughly making 230Whp and would like to increase my output closer to 250-270 at the same 11psi and am looking for knowledgeable input on what parts should be upgraded or additional tricks I can consider.

A/C and P/S is currently installed and the first things I'm going to do is lose some weight (removing my sub/box, amp, A/C, P/S). Will be looping my steering rack and using an Civic type-r pulley. I realize this won't do a whole lot but it'll free up weight, less drag, open engine bay for better cooling...


I'd like to keep my budget under $1000 for the added power and I've considered switching to a mini ram, 3" DP and 3" full exhaust, starting with the exhaust first.

Based on *experience* what whould you recommmend?

Don't have many photos at work but attached is one from when assembling.

Thx in advance for any solid advice.

 

The exhaust manifold isn't the issue. The issue is your elevation and turbocharger size relative to that elevation.

If you want more power with the same boost pressure, you have to have more CFM airflow that's converted to pressurized air; meaning, a larger turbocharger compressor wheel has to be used.

 

Thx Shodan, so you're saying my bottleneck is the turbo I'm using? Manifold, DP and exhaust won't free up much / if any power?

What turbo would you recommend?

 

Honestly, really answering that, my question is, why not turn up the boost pressure instead? Boost pressure doesn't kill engines, its the power it creates. The stock engine can't safely do more than about 350whp no matter which turbo you use. Don't start thinking about 11psi as a limitation.

 

I guess that would be too easy Shodan, lol. Just trying to figure out best way to make more power and didn't bother thinking about turning up the boost as my thinking was more boost equals more chance of going ka-boom.

I'm tuned to 14psi and can replace the springs for that pressure. Any other suggestions?

14psi, ITR cams, bigger throttle body, 3" exhaust and a new tune?

 

you're on s300, why not use boost by gear?

 

I am from colorado, and just wondered what shop you had tune your setup?

 

considered boost by gear and my S300 has boost option. Tuning for boost by gear was more $$ and my tuner didn't see the benefits since I'm running relatively low boost.

For now, I'm just running various boost springs and can turn it back up to 14psi.

Tuning was done by Servion at Revolutions Performance in Colorado Springs. Jeremy is considered the best Hondata tuner in colorado. Look him up if you're in need of a tune.

 

i have a tuner, that i trust more. lol. no offense to your guy, but i would love to see your tune. Are you on e85? also, and what trim?

reason i think your tune is junk, is i had a friend with a stock y8, with a 52 trim make as much horsepower as you at relatively the same boost level. He also was in denver, so altitude was not the reasoning.

 

If your in colorado, you should know about the PFC hatch. and what a stock gsr engine is capable of on a good tune, and what it can handle.

 

Don't just switch springs. Get a proper boost controller, tune for higher boost levels and be happy. The tuner is the only one that will know when its not safe.. (Unless the tuner doesn't know how to "tune")

 

You have a tuner that you trust more than someone you don't know or have heard of? No offense taken. Servion / Jeremy has been around for a long time and is well respected in the Colorado import community for offering great tunes.

Revolutions performance (shop he does tuning at) uses a Dyno Dynamics dyno system which will be 10-15% less than some others. They call it the heart breaker. http://www.revolutionsperformance.com/honda.php

I trust my tuner and my tune. Looking for longevity along with more power. I'll be taking my car to the same dyno/tuner once I've determined if any upgrades are needed for a retune.

Precision 4831B is a 48mm inducer, .63 A/R
tuned on 91 pump

BTW, who / which shop do you use/recommend for tuning?

 

Thx Shodan. When dyno'd my map was properly tuned for 14psi (boost cut). Jeremy, my tuner said we can keep going as all numbers etc. showed to be safe. I asked for fine tuning of map at/up to 14psi and told him I'd be running anywhere between 10-12 daily using springs. I currently have the springs needed to get to 14psi so I'll be doing so shortly.

Any other recommendations for more power?

 

Sorry I don't know the PFC hatch. I know of PFI in Loveland, one in the same?

 

it's not just a matter of regulating max boost, but you can also kind of ramp the boost with boost by gear.

 

To be brutally honest if you want to make killer power per psi on the same turbo increase the compression a boat load, get a very high flowing head and cams and youll make 15-16hp per psi.

But thats silly when you can easily turn up the boost. You have the fuel, the map sensor and enough turbo left. Just turn it up and retune. This is not an N/A motor.

 

Nope. This isn't an LSVTEC with bolt ons. Turn the boost up safely, and make sure that the tuner has it covered.

 

this is what a stock gsr in colorado on a good tune is capable of doing. The turbo you are using is very small also, get a 52. trim and i bet you can run 12 psi and make 250-300 horsepower.

http://www.youtube.com/watch?v=CFf7A1JwpAs