New Steve W Chip
 

Steve W. installed a chip in my stock 1987 Carrera yesterday. Steve also pointed out the brown, power zapping, "California/Japan Emisions" wire coming out of the DME control box (quickly disconected).

The change is immediate and unmistakable. Any flat spots or lagging sensation my Carrera had at lower RPM's are gone. The top end feels the same. But, below 4,500 RPM, my car is much more responsive and quicker. This will be my only mod as long as the Carrera is my daily driver. I am very pleased with the results thus far.

Steve: Thank you for the assistance with the installation and THANK YOU for the exhilarating ride in your car--Hehe!!!

Thank you Steve.

Sincerely,

Mike

- does this mean my euro carrera from Japan has this nasty little brown wire??

I mentioned this is another posting...

I added the SteveW chip and disconnected the brown wire also. I noticed alot of smoke and a headache inducing smell from the exhaust after that. I reconnected the brown wires, no more smoke, and smell is gone. The car still feels powerfull and the lower RPM range is definitely blessed by SteveWs chip.

So just in case you see smoke and get a headache from any exhaust smells, try reconnecting the brown wires, it worked for me.

LOLs Mike! Glad you like it, though I was thinking the improvement wouldn't be too noticeable after going for that joy ride with 493 hp and 500 lbs of torque! :D

Moazam, thanks for the update. Looks like the slightly revised low rpm/idle mapping which I implemented a couple of weeks ago caused the smell. One other person also kind of noticed it also. So keep me up to date, and if you want, we can switch you out with the previous version that had no problems.

Steve:

The improvement is noticeable. It just feels like I improved a 1950 VW Beetle. I hope to forget about the 500 lbs of torque soon so I can appreciate the relatively modest performance of my Carrera again--lol!

Mike

Kevin:

You should check the numbers of the engine in your car. The Japanese 3.2 is rated the same as the US spec, ie 217 hp rather than 230 as the true euro cars have.

You mean 207hp rather than 230hp right?

Nope 87-89 have 217 bhp.

Mike

Mike is right on the US 3.2s. The euros had 230 from the start. Higher compression and different DME

Er, Gentlemen: 231, 231 !!! :D

Paul:

With the "brown wire" off my DME and Steve W chip, I am sure I am feeling you at 231--perhaps even 232.5!!!

Mike

Steve - I've noticed my car smokes a little when coming off a sprint and back down to idle. It's scared me - I've been monitoring my oil intake so, don't think it's valve guides. Any chance it's the chip?

- checked before I bought it- its a Euro.

Here are my first impression after installing a steve w chip and disconnecting the brown wire in my very stock 86 carrera. I also verified that the throttle opens completely and that the full throttle microswitch closes.

Nicer to drive around town at part throttle. The car responds better to very small throttle inputs, making it feel like it's always ready to go.

A little more power at the top end.

No occasional hesitation below 2000 rpm when taking off from stop signs.

Possibly easier to stall when cold

No bad smells yet (and that's maneovering into the carport with exhaust tip passing within 3 ft from gf's nose)

/ Johan

Hi guys - here's a page from the Porsche manual on the terminal 10 brown jumper wires. Chris Bennet just reminded me of it and scanned this for us. The 15, 17, 18, 19, DMEs are 28 pin Euro/ROW DMEs, and the 16 and 20 DMEs are U.S. spec cars. For 24 pin U.S. boxes, the bottom chart would apply.

http://forums.pelicanparts.com/uploa...1069094285.gif

Hi Jeremy, Moazam, what you're seeing is from some fuel richness at parts of the chip mapping, which seems to be appear for some 87 owners and a 24 pin chip, with a certain variation of chip coding I am using. They use an entirely different coding for a 24 pin of that year. One thing that causes richness is a weak or disconnected O2 sensor. But Jeremy, what you could try is what Moazam did with the jumpers, or email me and we can try to switch you out with a different 87-24p program.

Hi Steve....hey I am still running (and liking) your chip in my 85....the car was originally a Cali car....is there an additional improvement I can make by diconnecting a wire that will not cause any other problems?....TIA

Seems so. Allegedley about 7HP difference (reading from another of SteveWs posts).

Marc, you still have it connected? Disconnecting it should make quite a difference for the 84-86 cars. On those years, leaving them connected almost seems as if no chip was installed. Give it a shot and tell me what you notice.

From:
http://forums.pelicanparts.com/porsche-911-technical-forum/135777-stevew-equipped-carrera.html


As per SteveW:

"Regarding the two brown wires off the DME harness you have inquired about, they are only supposed to be connected for California and Japan cars. Their function is to lean out the fuel mixture further to meet extra stringent emissions requirements in those regions and reduce the car's overall hp rating to 200 hp with a 0-60 of 6.7 seconds. The 49 state versions have 207 hp with a 0-60 time of 6.1 seconds. These are the published spec in your owner's manual. Just disconnecting these two wires with a stock chip will already improve the car's performance."

Wow....I cant wait to try it out....thanks...

So I guess the question for the 84-86 cars is if it was a California car or Japan the brown wire would be connected? If not it comes disconnected?

I put in your chip Steve but did not check for the jumpered brown wire, I assume my car that lived on the east coast all of it's life would have this disconnected.

Dyno runs of all of these combos you spoke of in another thread would be helpful but I know that time is expensive.

-Jeff
nolift911@hotmail.com

Correct.

OK I am a little confused. What brown wires? Are there 2 of them and where are they exactly? Where are they disconnected from? Does anyone have pics? I have a CA car and Steves Chip and I do have a performance gain and I didn't disconnect no stinking wires. Should I have?

I'll try to take some shots tonight and post them.

The wires are right in front of the harness, you should see them after you flip back the carpet covering. Two somewhat thin brown wires connected by plastic white connectors. CA/Japan cars have them.

You should see a performance gain with SteveW chip even if you have not disconnected the wiring. If the wiring was the only trick, we wouldn't need to buy SteveWs chip. :)

there's a brown wire which has a connector on it. The wire runs along the main cable that goes to the connector on the DME. Disconnect this connector and see what happens.

It might be that the jumper wire is already disconnected on your car.

/ Johan

Any chips on the horizon for the 993 3.6??

brown wire
 

I located the brown wire in question on my '88 (CA model) Would I be wise to dis-connect it? Should I see a difference? I always thought the car was a little weak off idle.

Re: brown wire
 

Try it, wont hurt. Worst case, you can connect it back in about 1-2 minutes.. I think you'll see some improvement, but maybe more so in the overall top end.

If you feel the car is weak off idle, you should probably give the SteveW chip a try if you don't already have it.

Here is a pic of underneath the drivers seat, with the mat flap pulled back. You can see the wires right up front. Some cars might have them pushed back behind those black cables, not sure.

http://mail.hudat.com/~moazam/CAJapanWires.jpg

My God..my hand looks like the hand of Ol' Grandpa Simpson.

Code7, the only 993 chips I developed are for the '95s. 96s are unchippable, and the 97-98s are a pain to hack with OBD-II. So if a 95 is what you have, email me and we can set something up.

Moazam, that's a great pic. I'm gonna save it for every one that asks about it. You know, if I had a nickel . . . . .

Si if I'm running a euro premuffler and I connect the brown wires will it improve my emissions ...for testing purposes?

zzwhm - it should. It's what I usually do as part of my routine just to make sure my emissions will be way below test limits. Never failed to pass all these years. But then I also put a cat back on too.

I have been told a well tuned 87 will pass here in TX even with a euro premuffler. I'll connect the brown wires and be a CA car for a day if it'll give a little extra margin. Your chip is on my Xmas list.

Yur cars run on them there computr chips? Gaullly

:D

beats pushin

I have gotten a Euro 3.2, with headers, performance chip and no cat through emissions in TX. However we had to (temporarily) pull the Euro DME out and put in a US stock DME to do it.

The two brown wires do the following:

1. Pin 10 to the DME affects the timing for lower NOX and/or octane,
open advances the timing

2. Pin 28 to the DME affects the mixture by bypassing the
altitude sensor, open richens the mixture

So by using these two jumpers you can basically get a performance
gain without buying one of the so called performance chips. If you are
seriously considering wasting money on a performance chip,
have the supplier provide dyno data which should be available
if the performance chip was developed properly; i.e. maps
must be determined using a dyno to maximize the torque for
all loads & RPMs and to avoid pinging & detonation.

Properly developing fuel and ignition maps is NOT a simple effort
that can be done using a PC. Just "winging it" by offsetting map
numbers without dyno testing can cause problems; e.g. pinging,
detonation, emissions failures, and damaged cats. Check out this
website (www.systemsc.com) on the Technical & Graphs pages for
some info on the problems performance chips cause.

Have Fun
Loren
'88 3.2

I just put in my Steve W chip two nights ago as well, and it rocks!!!!

I really notice a strong power surge where there used to be none - between 3-4K RPM.

It really kicks in at about 4K RPM

BTW, this is for a ROW car with a Dansk pre-muff.

Keep up the good work Steve!

Get em while they are hot - Steve has posted a price increase soon......

With all respect Loren, are you here to spam us here with your website again? The pin 10 connector is already disconnected on the 49 state cars, as they are only connected for the California and Japanese versions for the U.S spec 930/25 motors. 90% of the guys running chips that I know are outside of California, and still get a dramatic improvement in power, response, and fuel economy.

Though you might think, richening the mixture everywhere does NOT increase power. It can increase throttle response in certain regions of the power curve, making you think its faster, but it will loose power in others. My dyno testing on an otherwise stock U.S. 89 Carrera has shown an 8.4 hp loss with a 5% richer mix. In addition, running richer everywhere will only decrease fuel efficiency, increase overall emissions, cause excess fuel wash into the motor and valve guides, dilute the motor oil, and overtax the cat and O2 sensor - but we've been through this already. You can play games now, or pay up later. This is why specific fuel curves are set up for each owner's configuration, from stock with a cat, to modified with headers and megaphones, cams, etc.

Some of my customers have reported that they just passed California emissions testing, no problem, and some have actually realized a 50 mile per tank increase in fuel economy on their highway mileage. Try doing all that by playing with the sensors.

Hey Loren, how about you jump over to the "electric supercharger" thread?