johntorg

I just managed a couple of street runs on my 951 to check the AFR. I am starting a new thread because my last thread was getting too long.
Here are the details of the car from the first thread: Link

SFR stage 2 turbo with stage 3 turbine
Stratosphere forged 006 Diverter Valve
SFR stage 1 SS headers
Tial 46mm wastegate with adaptors
Pro Flow 75mm maf with arc2 fuel controller
Turbonetics MBC
52lbs injectors
Huntley AFPR
SFR short throw shifter
Russell liquid filled gas pressure gauge
Autometer boost gauge
Guru custom chips for 18 lbs.
Tech edge wide band o2 with NGK sensor.
Rebuilt head with 3 angle valve cut
SFR 3" exhaust
Wide Fire Headgasket

Its running pretty well and was Dynoed at 320 RWHP
I would like to take this car to the next level 375 to 400 RWHP

This JIMBOIIII's old car, and he and others have been helpful in giving me suggestions for upgrading the power output.

I am currently trying to tune the ARC2, since the ***** may have been moved since the Dyno run was made. Any input will be appreciated.

toddk911

Looks pretty good actually.

I am also in the process of tuining with ARC2. I know there is a lot of overlap from LOW, MID,HIGH into each other.

Is there any where to find out the exact rpms each **** controls?

toddk911

Did you just do a 4th gear run, like if a dyno run, but on the street?

I.e. drive normal speeds in 4th then go WOT till redline?

hard to do unless you have a lot of open road

johntorg

Run was a third gear run. I found out that I also had a possible air leak after the MAF sensor. I haven't found out where exactly the ranges work in terms of RPM. The manual shows some graphs, but they aren't scaled.

macnewma

I hope your ignition timing is spot on.

Eyal 951

why?

hally

a/f looks nice and safe, being below 12 by 3200rpm.
What's your cold side?

macnewma

Why? Are you curious as to why appropriate ignition timing is important or why I would hope his ignition timing is appropriate given his Guru chips, a MAF and an ARC2?

hally

For AFM chips, guru WOT ignition timing is identical to the current flavor of the month vendor.

macnewma

That may be true, I really can't say, but do you know what timing cell is used after it passes through the ARC-2? On route to dialing in your A/F you are also changing the timing as it is based on the perceived air consumption from the MAF. Might it be spot on? Maybe, maybe not.

hally

unlike fuel, WOT timing is based on RPM only.

jimbo1111

Your A/F isn't bad. Try and turn down the high one click at a time. If It has no affect than drop your fuel pressure a couple of psi. This will affect the whole fuel curve. You may have to add fuel to the mid and low setting on the arc2 to compensate for less fuel. Ultimately you will get to a happy medium.

As you can see by the HP thread there aren't that many 400 rwhp cars around. The first thing I suggest you do is change the stock pressure plate. It's only good for 360 fp of torque at best. You will need a good cam and possibly some seat work done to the head. High flow fuel pump. The turbo has to go.

jimbo1111

Cool. Can someone varify that. If nobody ansewers I guess it's true.

hally

jimbo i am offended that u would doubt me
ps looking forward to trying out those 52#ers you sent me soon, once my new turbo is in.

johntorg

Jimbo, the high RPM **** is already full lean, so I guess I can turn the low (which affects all rpm ranges) down a click and boost the midrange up a click and see what happens.