RDS928S

In planning my spring time mods-are adjustable fuel pressure regulators required if you have added Autothority software and a x-pipe(no cats) for a 86S 32 valver?
Will it add any HP/Torque?.

Thanks Rich

MarkRobinson

Rich, I've commonly seen 30rwhp/tq wiht teh addition of both & some fuel tuning will add another 10 or so if done correctly. AA chips just make it too rich, although, I plan to put the AA LH chips back into the turbo car: can't get enough fuel with the stocks I'm thinking...

Mark

RDS928S

Mark,

thanks.
An extra 10 ponnies is worth it. What equipment is involved in fuel tunning and how is it done ?
You are right about the Autothority set up-my car always has that rich unburned fuel smell at idle.

Rich

mark kibort

I want to see the dyno runs of 40hp gain on a 85. seriously. just a set of pipes, fuel reg and a chip??

I know the fuel optimization on my 5 liter 2 valver, saw only 4hp going from 13.5 :1 to 12.5:1.
timing was only worth 3hp all the way through the curve fo about 5 degrees retard, and 4ftlbs lost at max torque, but that was worth it. headers gained us 12hp and the open exhaust gained us another 12hp. so, thats a 34hp difference, but with headers too.

what do the 85s put down usually? 250 at the wheels?

mk

mk

jeff jackson

RDS...how old is your oxygen sensor ? You might consider a new Bosch replacement for your 86...but as far as "fuel tuning"...you are pretty much limited to the OEM scope of tuning by the proper operation of the "feedback" loop...or Lambda loop, as far as "off-idle" performance tuning is concerned...Plus, the benefits of your "performance calibrated" LH+EZK chips...In other words...without going to some sort of supplemental AFC, (which BTW...is completely adjustable via inputs from your narrow band O2 sensor, and MAF inputs to your LH computer)...you can use the Dyno, to "tailor" your specific A/F ratio at 7 or more different RPM points in your power delivery curve to keep the A/F in the desired parameters for your car. The Apexi SAFC is very popular amongst the "turbo crowd" for this purpose...and is much more economical...and just as effective for a "street car" tuning, as going to a "wideband O2" control system and standalone fuel management computor. Or...Greddy also makes a controller that allows independantly programmable fuel, and ignition curve mapping...in one piggyback unit.

RDS928S

Jeff,

O2 sensor is as old as the car(1986) i assume.
What will the new O2 sensor get me?

Thanks Rich

tammons

The rising rate part wont do anything for you.

Those are designed for boosted engines and typically raise the FP so many # for every # of boost. Just a plain old adjustable FP regulator would do it.

mark kibort

new o2 sensor is for better fine tuning of your part throttle operation. (mpg, and emmissions, thats it)

MK

jeff jackson

Just more confidence that the factory control loop is performing as it should under "optimal" conditions...The O2 sensor, is often neglected during "routine tuneups"...as unnecessary...In my view, if not regularly changed...say every 50K or so...your system is probably not running as good "off-idle", as it should. The Lambda loop...is out of the controller function during Idle+WOT conditions...all other conditions...when the engine is warmed to operating temperature.... the loop is controlling the A/F mixture via a voltage signal to the LH controller...The LH reacts to this signal by "varying" the injector pulse duration...The SAFC, allows you to "intercept the MAF signal to the LH unit, and accordong to Dyno data...manipulate the signal...to achieve maximum A/F tining across the "usable" RPM / power band of your engine.

ErnestSw

Make all the additions that you're planning to make and dyno the car with an air/fuel ratio sensor. If your car leans out too much at the top end add an adjustable fuel pressure regulator. Chances are you won't need it, but it pays to be safe.
Your "narrow band" stock O2 sensor only tells your car whether it's rich, normal or lean. If your CO and O2 measurements are normal with a tail pipe sniffer replacing your O2 sensor is a waste of time and $$$$$$$$$$$.

RDS928S

Jeff/Mark,

thanks. Ok no rising rate mod then. That money will be spent on a Bosch O2 sensor. Car currently has 65k on the clock.The original owner did'nt change a thing except timing belt.
The car does exhibit a slight stumble coming off idle when accelerating.
Jeff any time you find yourself close to NJ feel free to stop by for some fine tunning

Rich

Rick Carter

Mark et al,
The following is from Jim Komiak at:
http://members.rennlist.com/jkomiak/

The first number is rwhp the second rwtq,when I dynoed I lost power with AA chips, also unusual I gained 4-5 hp with K&N and most people lose the same.

Glen McCartney 85 S Auto 237 221 Stock
Rob Fossett 85 S Auto 235 229
Glen McCartney 85 S Auto 253 252 Autothority Chips
Brian Fleming 86.5 S Auto 253 251 Cat Bypass
Patric Fransko 86.5 S Auto 255 244 K&N/RMB/Chips/RRFPR
Carlos Hernandez 86.5 S 5-Speed 267 285 Stock, Cold Engine
Richard Carter 85 S 5-Speed 291 290 T. Cloutier Exhaust, Louis Ott Perfect Power SMT-6 Piggyback, Heads P&P

jeff jackson

Rich...the new O2 sensor..wil get you an improved fuelmixture, in all operating conditions...except Idle...and WOT. The chipset will "optimize" your fuel and ignition maps...but this programmed "tuniing"...is dependant upon proper input signals, from both the MAF meter, and the O2 sensor. So...Either one of these signals, (if incorrect), will alter, and cause less than optimal injector pulse duration from the LH controller. The MAF is the more significant of the two, in terms of "driveability" + performance concerns...but the O2 sensor, if oil fouled..or not functioning properly...will cause poor fuel economy, and generally less than optimal off-idle performance (other than WOT)...

James-man

2 5 speed 86.5s were dynoed last year. Stock ran 250 rwhp. RMB + AA ran 272rwhp (no baseline cuz the mods were done 8 years ago - back when dyno was not a household word).

The stock runner should have RMB and chips installed by now. Next dyno run will make a for another good proof of AA chips.

The car that ran 272 has X pipe now. Next dyno run will make for another good read on what RMB + AA + X can do on an 86 32v.

40 hp is probably on the outer limit of our total potential gains (N/A). Much less than 30 would be disappointing.

John Speake

It makes you wonder if AA optimised their chips on a car with quite an aged MAF, because many people complain of the car running too rich on their chips....