lorenolson888

I am trying to get a handle on how many chip options there are for the 85-86 US cars...

I know there are Autothority chips.

Anyone ever heard of these guys...

Seems to be euro S2 only...
http://www.promax.uku.co.uk/promaxchip928.htm

or
Seems to be vague...

http://www.automotion.com/productpag...werchips%c2%ae



Many have said that the e-bay chips are autothority.

But what other makes of chips are there.

I have been looking at the stock and ebay chips.... but am interested in collecting the Bin images from any others out there..

Seems like superchips does not make a chip for 928 anymore... and it may have only been for 87+... any comments...

Please let us know what chips you guys have bought for 85-86... also let us know your source. Any real dyno numbers sould be great too...



Thanks,

LO

MGW-Fla

Per the dyno shown on Dave Roberts at 928 Specialist's web site on the Auto Authority Chips for the 85/86 US 32v models:

"Our AutoThority chip upgrade provides your 85-86 928S with an approximate 20+ horsepower gain at the wheels and an approximate 20+ ft/lbs torque gain to go along with it. The low-end torque and throttle response are improved and the driveability is smooth throughout the entire power band. The performance can be felt right away as your 928S will speed through the revs quickly before reaching the raised rev limiter. The rev limiter has been raised 300 RPM in each gear and there is no top speed limiter. Our AutoThority Performance Chip is a simple upgrade and comes with full instructions on how to install it in your 928S."

Shane

Here is my dyno chart running AA copies I believe, with no other modifications, still has the cat in place. I did have a RMB on though.

RDS928S

So that looks like a rip if the stock run is 279. ONLY 2-3 HP & Torque.

RDS

jeff jackson

Rich...on my 86.5...the difference, (with NO other changes),...was like night and day...the car was noticebly more responsive, and the Rev Limiter is raised to 6300, and it even seems to idle smoother. BUT...the power increase has to be more in the 20 HP range from my experience...This was with Autothority genuine chips...but I have lots of prevaricating information regarding the "counterfeit" type copy chips and their actual benefits... One thing is certain...when Porsche first gave the go-ahead for the 4 cam 32V engine for the 85-86 series cars..they had Bosch "detune" to a point that excessive recalls, or owner complaints would not be problematic, while they worked on refinement of the engineering of this Brand New 32V V8...so...the fuel management maps for the 85 particularly..then the 86 up to a certain VIN number of production, were somewhat less than optimal, compared to the late 86s...and the 87 and beyond S4 models...so, there is a significant ammount of power and torque in the existing components, left untapped by the OEM fuel Management for these models. this was something Autothority quickly capitalized on..but unfortunately...by 1987, Porsche had enogh confidence in their engines, to "tune" the fuel management, and ignition control..to a pretty high level for a factory produced vehicle, and thereby "lessening" the benefits to be gained by aftermarket chips to a point that they weren't even close, to justifying the cost of the aftermarket parts...85-86s...are the epitome of the "chip" benefit, for the 928 LH system...beyond that...they simply aren't worth the money.."bang for buckwise'...

RDS928S

Hey Jeff,
good to hear from you.
Check out my 928. Added aero mirrors, electric fans and lots of leather.
Actually the biggest bang for my buck as registered via the butt dyno was the electric fans. More so than the Autothority software/x-pipe etc.

Rich

Shane

All three runs are back to back runs with the chips. No before chips dyno to compare to except most stock 86's run at around 250-260rwhp.

Imo000

I've also noticed a huge improvment (~25hp) with just the chips and nothing else.

RDS928S

ok,

now i feel better knowing the first run was not a baseline stock run.
I have the Autothority set up too.

RDS

stealth

Would these maps be the difference between Jetronic brain 928.618.123.03 and 928.618.123.04, do you suppose?

Shane

Actually the map I posted above is from an early '86 928.618.123.03 version. Rather than switch chips in both cars I just swapped brains when I put the whipple on my '86.

zoltan944

the notice in the AA chips was absolutly night and day! Every part of the power band you complained about in your head before the chips are fixed with em! its a MUST have for 85-86

Mark

That link to promax, in the initial post, is the FIRST I have ever seen of chips for my EURO.

Anybody have any experience with these??

How 'bout you guys on the right side of the big pond?

jeff jackson

Yes Shane..I think it is...I had the "04" brain in my 86.5...and the WSM lists either of the numbers as "applicable" for these cars...but I think Posrche was "ramping up" the performance in advance of the 87 model S4 32V engine...Although rated the same for HP and torque from the factory specs...I think there is a noticeable "difference" between the 85s with the "03" LH brain...and the 86s (particularly late production 86s...with high serial numbered "04" LH brains... as the tuning was optimized, and the fuel maps more aggressive...

lorenolson888

So it seems as though the Autothority (AA?) chips are the only real ones out there....

Is there anyone local to the bay area who has a set of autothority chips not currently installed. I would like to read them in and comparethe bin to the e-bay chips...

Also I have been looking into the bosch and porsche part numbers...

There does seem to be two different numbers for the LH2.2 brain

The number is 0 280 002 502 (that corresponds to a 928 618123 03). The 03 has been superceded by the 04 which is probably just a small software update. I don't know whatr the Bosch # for the 04 is.

928 618123 04 is the number currently in pet.

I imagine that this was a slight change to the eprom code...

I think that a friend has the 04 code... will have to take a look at his LH box to see if it is a 04

Thanks,

LO