Bill, I have never thought of you as odd.............just unique ;-D

 

Would the EIS have any reasonable impact on an S3?

 

First off..there will never be a "set" of chips, because every car will be different. My tune may crater your engine.


With Xpipe, 3" single exhaust, EIS, I gained 14Hp and 17Ftlbs from the stock maps with FUEL only.

We have not yet done timing work..

 

Jeff: That's not much gain for all that work. X-pipes alone have been 15-30 HP and TQ, depending on model, even w/o tuning. How much gain did you see before fuel tuning?

 

Unknown.

 

Great point you brought up; that there is no "one size fits all" chip that guarantee's increased power output. I think those "one size fits all" chips (Autothority for example) might improve power, but on some cars might not do anything for power or just shift the power band.

Also, while we're on the topic, does anyone have any LH-Jetronic specific material/manuals? I would love to know more about the 87+ LH systems so i can better understand 928 specific tuning. I did find this but it is Volvo specific and just for troubleshooting purposes. I know the WSM has information about the system but i would like a more comprehensive guide to LH-Jet, is there any Bosch material on LH-Jet?

 

There is no S3 version yet. We're still waitin' and a hopin'.

 

I'm not sure I agree that there cannot be one-chip fits all; that is, for cars with the same equipment. That's what Ken has for S3s and it seems to work well. We have one chip fits all stock, and I see no glaring problems. Autothority chips were just not well done.

 

That's sort of what I was thinking. Porkens chips are widely praised for the S3. Couldn't something similar be done for the s4. Not looking to push the limits just leave less on the table. A tuned chip for a specific set of mods. I'd buy that!

 

As usual some interesting observations and variations. Some folks have engines that run well and some that run not as well as others. If we eliminate the ones that run poor because of maintenance issues that leaves a range of performers.

It is well known that some engines run stronger than others but when Porsche say their engines produce 320 BHP what they mean is they all produce 320 bhp and some produce more.

In case some have not noticed all S4's are tuned the same as are all GT's and all GTS's I believe and you can use the GT maps on a S4 and I doubt it would do any harm. Thus incremental performance gains may be a case of YMMV. My 90'S4 motor with stock FPR felt quite lethargic but when I installed a rrfpr it felt livelier. This was running slightly higher fuel pressure. When I fitted the x-pipe and the other exhaust mods the engine revved easier. Then after losing the S4, I then put the s4 motor into my GTS chassis and fitted the GTS inlet cams. The motor felt fine upon commissioning. Then I had a go at sharktuning- backed off the fuel at top end to give 13.5:1 and mid range a bit richer at 13.0. Then played around with the timing a bit, especially mid range.

When playing with the ST2 I noticed that mid range circa 3.75k rpms knock initiated on a couple of the cylinders so I assume these were the cylinders flowing more air effectively leaning them off thus knocking earlier.

Later I fitted the cam cover spacers and felt an immediate improvement mid to top end, nothing spectacular, just smoother and more willing to rev.

Then I fitted Roger's EIS system and again it felt to give an immediate improvement with punchier top end I would say- no numbers to back this lot up as no dyno here.

One of these days I need to go back to the ST2 and see if I can get some more out of it.

I reckon that if you have a good example then these things probably make little difference but if you have lessor one then perhaps more scope to achieve improvement.

Regards

Fred

 

Have just come across the 928 Motorsports Firebird intake system. Looks very similar to Roger's system but more expensive (??) Has anyone installed or tested one of these. I am guessing that it is likely to deliver similar results to Roger's EIS system??

Cheers

 

Have a link to it?




If the tuner leaves enough safety margin in the programing, the chip will be safe for all cars. The problem is when all the safety margin is removed and then if something goes worng, it can be catastrophic.

 

oooops.......got the supplier wrong

Its 928 Specialists and it is the kit developed with the Supercharger that they are now making available for normally aspirated engines. Here's the link,

https://www.928gt.com/default5.htm

Cheers and apologies any confusion.