This one is nuts. This is basically a Stage 2.5 EVO9. So stock engine/head/cams/turbo/intake/throttle body all stock.

The car came here with our turbo back, our upper i/c pipe, AMS FMIC, AMS MBC, AMS MAF pipe with a K&N open filter on the MAF, stock EVO9 BOV. The car made mid 340 whp on 100 octane at 26.5 psi of boost.

The customer is looking for 370 whp. I felt it was possible with the addition of our 02 housing and a better BOV. So we added our 02 housing and the Synapse BOV. Put it back on the dyno and power was 350 whp/334 ft lbs. I tried turning the boost up and it just didn't want to make any more boost. I then swapped to our MBC as the AMS brass thingy was all the way tight. Our MBC made no more boost either. Very odd.

I stood and stared at the engine for a few minutes wondering what was going on. Then I noticed the K&N was rather beat up, dirty and looked small. I figured "What the hell, something is holding it back." I went and got our filter and was going just swap it in place but it wouldn't fit. Our filter was substantially larger than the K&N and wouldn't fit because of the ACD. I pulled the MAF pipe off and replaced it with our single bend MAF and then put our filter on. Jumped back in the car and with ABSOLUTELY no other changes the above dyno graph was produced. As you can see it went WAY lean and the boost went up. I fixed the fuel map, added some fuel and ended up at the same whp/torque level as above with the AFR's in the 11.8:1 range.

This is just incredible to me and goes to show how important the "little stuff" truly is.

We are talking a 16 whp and 19 ft lbs increase in power just from changing the MAF and filter!

 

That's awesome. Nowadays people get so stuck on the "big" money mods that you can overlook things like that. It's not one single thing that makes all the power, it's how effective the parts your using are. This is the perfect example. Makes me want to run up to STM real quick and ditch my K&N and grab one of these

 

very nice post, intake filters are different. in this case a big difference.

 

Good catch. Sometimes its the simple solutions that work. In my job I always try the simple fixes first.

 

Not trying to kiss daves ***, but i feel buschur parts are the best...I know from experience, buying one companies parts and not making the power i want, swapping them with buschur parts and making the power i should have to begin with

 

My build is in progress and reading this made me think I could be holding myself back with the stock 9 BOV.

Amsoil Filter, Stock MAF
3.5" FMIC (UICP & LICP)
70mm Throttle Body
Ported Intake Manifold
Ported Exhaust Manifold
BBK Full
FIC 1100cc Injectors
O2 Housing + TBE (100-cell HFC)
Walbro 255
Forge MBC
GSC S2 Camshafts/Valve Springs
COP

Will this setup benefit from an after market BOV?

If so, which do you recommend for running 93 octane with the goal of keeping it as civilized and easy/pleasant/stock seeming as possible?

 

If your after making big power on that setup yes it will hold you back, Stock metal ones leak badly anywhere from 21-24PSI. I maxed out my stock one at 370WHP on the stock 9 turbo Swapped to a stronger one (read below) and ended up at 389whp.

I was after stock driveability and ended up with the synapse DV(smaller unit) They claim it holds a lot of pressure 60psi maybe i dont recall for sure. Ive tested it to 35 with no leaks and it drives as good if not better then the stock DV at low speeds. The synapse also bolts right into the stock location perfectly. Its pricey but worth every penny IMO.

 

i seen something similar before. a guy on the dyno had a k&n that looked like it was sucking itself inside out and they removed the air filter and the car picked up 50whp lol. sometimes its amazing what the little things can do.

the big picture here being, the gains are across the board. im sure the owner was very happy you found his bottleneck.

 

Thank you, this sounds like what I want/need. At this point I've got every last thing I can think of that will yield gains as a system and I don't want the last $200 holding me back. I'm not finding the exact piece you mentioned at MAP, however. I'll keep looking.

 

http://synapseengineering.pinnacleca...9_X-562-0.html
Link for you, i ordered mine through MAP You might have to call or email as i dont see it listed on the website theres a very long review thread on evom about it, people love it! chris@maperformance.com

 

Thank you! Found it for $244.60, shipped here:
http://www.customcarscentral.com/syn...o-viii-ix.html

If no EvoM vendor beats or matches that by the AM I will pull the trigger.

 

Edit, didn't realize this was another vendor's thread, sorry Dave!

 

They are on our site but we spend a lot of time testing and posting information, I can't price match, I like to hire ******, not be one.

If you crush that EVO9 BOV you can run it without it leaking up to about 28 psi.

 

I agree, using a good air filter can make a huge difference: https://www.evolutionm.net/forums/ev...t-results.html

 

Maybe it's time to get rid of the stock airbox and get a Buschur intake/maf pipe/turbo inlet pipe on my beater. The bigger turbo might like it.