antlee928

Hi, I am considering some minor performance improvements for my S4 MY89. To the possible disappointment of some on this forum I shall not be considering supercharging or turbocharging....well not on this baby anyway. Happy to have her in reasonably stock condition.

I have read on Roger's EIS system and am seeking information from people who have implemented this system and what kind of results they have achieved - dyno and/or seat of pants e.g. better throttle response, more mid to top end power, etc.

I have seen previously some folks say that going with the aluminium system creates a heat soak for the cold air induction and therefore potentially robbing the car of power i.e. less dense air. Roger's own web site reports on dyno results on the same day across 3 different cars (87 S4, 88 S4 and 2 x GTS) of improvements.

I am also considering the the intake manifold spacers which I understand provide improved breathing/air for mid to top end. Comments?? Combine this with the EIS system for better air/breathing on the intake??

Maybe my money might be better spent on the SharkTuner and to re-tune/optimise the standard tune in the cars current configuration??

BTW, my car current runs Roger's X-pipe and hi flow cats. No other modifications. Oh, I did disconnect the airpump.

Cheers

SeanR

You will be happy with the results of both in terms of performance and looks. The intake spacers, we weren't able to show any measurable improvements dyno wise but I think they look fantastic.

As far as heat soaking of the EIS? People will say anything. The air moves through it fast enough that it does not have a chance to get heated up and even if it did increase it .001 of a degree, the more even airflow results in way more gains than will be lost.

S4ordie

Start with the Shark Tuner to get the car running as it should then bolt on the power adders. You need a good baseline first otherwise you have no idea if things really increased performance.

17prospective buyer

I have to agree on your rebuke to the heat soaking question. Hell i bet the MAF hot wire heats the air more than the "heat soaking" effect! I heard the intake spacers were supposed to deliver gains at really high top end, but who ever travels at 6400RPM sustained for longer that 2 seconds? Are we talking about the same thing as 928MS's spacers for the "end caps" of the intake?

Bill Ball

Has anybody really gained anything significant by Sharktuning a stock S4?

antlee928

Hi, I am referring to the 928MS intake spacers.

Cheers

antlee928

Hi Bill,
I have seen a number of positive commentary about Sharktuning a stock S4. These things tend to run way to rich in the higher rpm and I believe theere are improved fuel and ignition maps that do make a noticeable difference to the stock car. Does anyone esle have any views on Sharktuning a stock S4?

Cheers

antlee928

Thnx SeanR. I tend to agree.

Cheers

SeanR

Use Rogers intake spacers so you don't have to smother goo all over the intake. It uses the factory seals.

antlee928

Thanks Bill. It hadn't occurred to me that Roger also had intake spacers. I will query Roger shortly. That way if I go intake spacers and EIS I can source from a single supplier :-D

Cheers

Bill Ball

News to me. I must not be paying attention. I've had Sharktuner on my car and really couldn't find anything to change. Mine goes mid-13s AFR on WOT. Not much room in the ignition maps without generating knocks. The Sharktuner was very useful when I had my supercharger, but I never thought there was much room for improvement with stock S4s. Even now, with my X-pipe, my wideband O2 isn't showing any anomalies using stock maps.

Jim M.

Your car is not stock with the X-pipe and hi flow cats so shark tuning will help a great deal and should be your first step.

17prospective buyer

Thanks for the clarification antlee928, actually i was just going by the 928MS website information on the benefit at the spacers where they found a restriction at high RPM's with the "ram" tubes.

My S4 was sold to me chipped with the Autothority chips and to me the car ran wayyyy too rich at idle, exhaust felt way too gassy, moist, etc. Mind you the cats were gutted and so acted like an additional resonator to condense the H20 from combustion, so maybe i wasn't used to the smell of a car without cats. I changed the chips out for the stock ones and it ran a little less rich at idle.

John Speake

With a stock S4 you won't pick up a great deal with careful tuning at the top end. These cars had a very effective knock control system and so Porsche didn't have to be conservative with igntion timing, unlike the 85/86 cars.

Louie found there was about 10HP to gain with SharkTuning the fuel at max power and another 10--15HP with igntion tuning.

My own experience is that there are significant gains to be made in the mid range with igntion timing and fuelling. This makes a much more useful boost in performance for everyday driving.

Mike Frye

This is what I was thinking. The car already has exhaust mods, hence the benefit of the Sharktuning.

To the OP,
I can't speak personally for the EIS performance aspect, but I think I can speak for Roger's character and if he says there are gains on his website, I believe there are gains.

Plus it looks way cooler than stock.