I was re-tuned last Sunday with the HFS-5. We first did a 91 octane tune and then a 91 octane with the HFS-5 activated using a 50/50 mix of water/methanol. I gained 44 HP and 42 ft-lb of torque. The power band is just amazing, the car is totally a different animal. Here's the link to the thread started by my tuner for more details:http://www.socalevo.net/index.php?op...&topic=69396.0.

 

I am amazed at your gain without upping the boost. The CA gas must be terrible for power.

I guess you also save fuel at the same time.

 

CA gas is the worst i think.
was that 44bhp gain at the wheels?
just read that thread! awesome you can tell he got the tune right by the graphs on meth exactly copied your non meth runs but with just more torque more power.
loving the airbox mod too.
ps. where can i get that filter/bracket mod?

 

I agree, power gain is impressive for same boost. I can't believe how much he was able to increase timing. Those are really some pretty crazy timing numbers there.

Have you been driving the car much? How awesome is the meth/tephra integration. It's so nice to literally have a single button which gains you an extra 50-80 hp. It reminds me of an m5 with the ability to switch between 400hp and 500hp. SO COOL!!

 

will this meth setup inject when cruising if switched on?

 

Depends where you set the trigger point. You can set it as low as 12% IDC if I rememeber correctly.

That would be a pretty big waste of meth though, no need for it while just cruising.

 

my thoughts exactly, i had the s1 system years ago and i had that triggered from 10psi boost

 

Very nice! Glad to see a great gains out of the best mixture! Your tuner knows his stuff and doesnt depend on "octane" to get power!

Might I ask what size nozzels your running?

I have seen with enough "injection" (2x 1.0mm no restrictors on Evo IX) 6* at peak tq 15* by redline and 28 psi at 12.5 AFRS! On **** 91 too!


Evan Smith

 

Thanks. I'm running twin 1mm nozzles in the stock UICP. I'm very curious how much more boost I'll be able to run once I get the boost solenoid repaired. I just ordered a 3-Port Boost Solenoid and will hopefully be re-tuned in the next several weeks.

 

^^^ Thats seems to be magic in the evo??? Twin 1.0's at 50/50 mixture???

Do you have restrictors in?

I think you can run 30psi, just note timing will come down a couple degrees but its ok boost will net more power than timing

Evan Smith

 

I'm running the largest restrictor that was supplied with the kit. I believe it was the .9mm restrictor. Also thanks for the advice on the tune. Will be interesting to see the final outcome with how much boost this set up will tolerate. I'm still on the stock head bolts, so unfortunately I won't go too crazy.

 

Cool I wish you luck!! You might want to try to take out the restrictor, remember the HSV maxes out at 500cc at 4 bar, so its pretty much your restricor by itself.

Good Luck!

Evan Smith

 

Are you sure about the HSV maxing out at that point?

Also you could drill out the restrictor to make it bigger if you need.

The restrictor is important for helping the meth to flow linerarly at low IDC trigger points. Have you ever logged meth flow with and without the restrictor? Without it the flow spikes and then settles, like boost. But with one the flow is very smooth.

 

http://www.vividracing.com/catalog/a...l-p-22642.html

Maybe not "maxed" but "HIGH FLOW: The valve has and orifice of 1.4mm and maximum flow of 500 CC of water per minute at 4 bars."

I understand why its there. I also understand why others use check valves, but after the lengthly debate about flow through a check valve it came to the conclusion that they do hinder some flow. Same with restrictors. I would rather more over all, than smoothness. (At least with the HFS-5)

I find as long as the IDC trigger point is set up right the need for the restrictor is not needed as long as the cars demand is large enough (more boost and timing) for the incoming mixture. This is on the more extreme side of tuning and should not be used on a "road race" tune. Ill post up some logs tonight, to show the AFR's and what I mean.

If the IDC is set too early it will "spike", it needs to be progressive. Also Remeber the HFS-5 is unlike the 2D with a pressure sensor. With the slower reacting Sureflow pump and the long trip across the car takes some time for the pressure to rise to full force, so the amount isnt as high as we think.

Remember the precision came with the ERL Race pump in the 2D kit. Pressure was immediate and so was the response. Just lack of volume. The HFS-5 provides the volume at some sacrifice of precision. You can make up for that loss in more tuning of the ECU.



Evan Smith

 

The HSV on the 2d is basically limited by the race pump's capacity and pressure when the flow remains is in excess of 500cc/min.

If you put a Shurflo behind the HSV, it will allow in excess of 1,800cc/min at 125psi.
The HSV's flow can be extended by increase the piston lift. We have opted for the existing configuration, rarely anyone needs more than 1,800cc/min.

The two systems cannot be compared.