davek9

Ken I just picked up a used '87 FPR from 928 Intl (half off sale !

Now I am just wondering how much timing to remove with the Nitrous 150 hp shot I am running B4 I order a set from you, currently I am pulling out three degrees w/the low Octane loop.

She is extremely quick now…, but like Andrew said: “HP is a very addictive!” and I want more !!!

PorKen

Dave - good plan. The /55 fuels more consistently at WOT.

The EZF octane loop will put you into the v2.0 'superhot' column (~135F/57C) which has more retard than the stock octane loop, depending on load (vacuum level), but I can set it to whatever you want.

I am going to program the LH loop to also switch the cruise warmup map to a richer one. For nitrous (or whatever), I could make it much richer, if you wanted. (Stock, the LH octane loop only switches the scaling map of the O2 sensor loop to a slightly different scale. I assume to a slightly richer bias.)

BC

How do you get a list of all the bosch FPRs that are on german cars? I have one from the 928 that I was thinking of putting on the BMW if it raises the pressure.

Mike Frye

So Ken, if I had a WBO2 or some other trigger I could then wire it into the LH loop to choose a richer map if it was running lean or possibly if I had a knock sensor or something? Would it dial back timing also or just change to a different (richer) fuel map?

PorKen

If you had a knock sensor, with a little circuitry you could have a two stage knock control. Retard the timing, then richen the mixture if it still knocks. I think this is what the 951 KLR box does.



For those just tuning it...there are octane loop plugs on both the EZF and LH harness connectors. One or both may still be factory taped to the harness. You plug them together when using poor quality gas. Stock, only the EZF loop does anything. It grounds the air temp sensor input, which appears to the EZF as if the air temp was very high, which results in a 3° retard. The LH loop is wired directly to an input of the 8048 processor, but doesn't do anything noticeable.

anonymousagain

Ken - you stated "Stock, only the EZF loop does anything".

Does this imply, since your chips are not stock, both EZF and LH <now> do something? Or simply that stock wiring is only setup to address the EZF...regardless of chip?

goodspeed928

Make me some 90 s4 chips

PorKen

At the moment with my chips, only the EZF octane loop does something. (With v2.0 of the EZF chip, the OL retard is gradual according to load.)

Both the EZF and LH octane loop plugs are wired. The EZF OL just shorts the air temp sensor to ground (= no resistance = high temp). The LH loop is a proper input, and has it's own terminal, pin 19. It is referenced in the code, but all it does is change the location of a map used for the oxygen sensor loop. The OL map is very similar to the regular map, so in effect it doesn't do anything.

I'm working on making the LH OL do a little more, but I have to find room for the new code and map, which means having to rearrange the old hex code to fit.

Darklands

Ok,Iīm back from the dyno!

*tease*

*tease*

My car is a 86.5 ROW 5 speed with LSD and Kenīs newest chips.I use a motorsport x plus racecats and an RMB.

Max. HP was 327 at 5500 rpm

Thatīs 39 HP over stock.

Exellent work Ken. :-)

Darklands

Here the graph.

Mike Frye

That's got to be the most HP anyone's ever gotten out of an N/A S3. VERY COOL!


Correct me if I'm wrong, but 327hp at the wheel is a hell of a lot more than 39hp over stock. I think the stock numbers I've seen were 288-292 at the crank.

What does 327rwhp translate to at the crank?

Darklands

Hi Mike,

itīs at the flywheel/crank calculated! (DIN HP)

~ -20 HP (6.5-7 %) and you have HP at the wheels.

But again,I think a very good running engine.

Mike Frye

OK, gotcha. Sorry I'm not familiar with that graph. I usually see something with the peak rwhp and rwtq somewhere on it. (in English ).

Are you sure about that -20hp number also? I thought it was a percentage. So what were you putting down to the wheels, did it say?

Anyway, that's really cool and I know the torque is as much (or more) fun as the increased HP.

Darklands

I think we have 307 HP at the wheels.

Maybe the cold weather (5-6 ° Celsius) make a lot of power.

I donīt know if the hole between 2500-4000 rpm in the torquechart is right,maybe slip'?

Itīs my first visit in a dynoroom.

Ken or other specialists can maybe say more.

Mike Frye

That sounds right. I dyno-ed at 291 at the wheels last summer with the AA chips and crossovers. I don't think the AA chips raise the peak hp though. So I'm hoping to crack 300 at the wheels when I go back with the new chip/FPR setup and I'm still using the stock cat-back setup.

I think they told me with 291 at the wheels I was close to 340 at the crank so you must be even higher than that.

That dip does seem odd. Did you log AFR? I'd be curious what was going on with that as well.

Very cool though!