Vilhuer

14.7 for idle and cruise, 12.5 for WOT. WOT proved to be mistake in German autobahns. Fuel consumption was terrible above 130mph, something like 5mph.

Vilhuer

With 500 hp SC I would just go with 42s and stock fuel pressure. Two such cars I have driven haven't had any issues with idle.

all4woody

Glad this thread got started.
I just got my ST a few weeks ago and the only thing I've done so far is modify my fuel map. First I installed the 044 fuel pump and Accel 40lb injectors, this brought the fuel pressure down from 90psi to 38psi. The car seemed to run fine without any tuning, but I didn't really get into it before hooking up the ST. I have an 89S4 twin-screw with 8.5psi pulley. I could not get the car to idle with the ST set to 40lb injectors, but when I set it to 30 it seemed to idle fine and the autotune function made the baseline changes to the map. A friend and I the went up and down this long rural road near my house and he tuned cruise and WOT setting (he is an import tuner but was glad to get involved). This was last Wednesday night, so I had him burn a chip and I put the car back together to get ready for SITM. I have a Dyno 5 miles from the house, so I ran by Thursday after work to see how we did; the rwhp number were the same (around 450) but the fuel curve was great. I still need to fine to for cold start, but I eliminated the smoking problem I was having WOT.
I did not get into the EZK because I am in the middle of installing water/methanol injections and a 10lb pulley. Once I have these in, I will start advancing my timing and hopefully get more HP.
Once I have done a few cars, I will ST others as time permits. Having a dyno and garage close by make it easy to fine tune.
Just thought I would add my 2 cents. Any advice would be appreciated.

Later, Woody

AO

Woody, you just gave me an idea. One of the problems with the 30# injectors is that under the cruise map I run out of fuel when rolling on at 3/4 throttle making moderate boost at about 3500~4000 RPM. Then she goes really lean until I hit WOT or that 5200RPM magic point where is fires twice per cycle, then it goes fat and I'm off like a scalded banshee.

Wat if, we told the ST that we were using 19# injectors? Would that give us a longer pulse to add more fuel? Just trying to think of ways to skin this cat.

DR

Tony,
Cool Thread and a great idea.

As of last week it is now official, the ST wil definitely tune a Euro S !!! When I told John a few weeks ago that I was going to be firing up and SharkTuning my 85 Euro with my new 16V Twin Screw Prototype, he told me it hadn't been done yet. He joking said it "should work OK", talk about adding stress to my preperation to unviel the 16V system at SITM!!!

So far it is working great on the Euro, hope to get it to the dyno in the next week or so.


Andrew,

What you are talking about is covered in the ST Owners manual. If I recall John recommends to not go down or up more that 1 injector size when tricking the ST and LH this way. In order words, if you had 30s you would select 24s, or 36s to go the other direction.

bd0nalds0n

Not to be pedantic, but doesn't the magic point trigger one firing per two cycles, rather than vice versa?

Regarding the 42# injectors and the oversized fuel pump--has anyone calculated at what amount of boost/horsepower, etc these items would be necessary? It seems like the initial reasoning has been "more is safer than less," rather than the definitive determination that they are required. Not trying to be a naysayer, just trying to determine what's necessary vs. what might be overkill.

Also, with the SharkTuner, what's the need to have the WOT switch? Wouldn't you be able to program the ST to respond with the desired a/f ratio given a set amount of load while keeping everything in closed loop, rather than dumping over to a map when it goes open loop? Seems like that would be more precise, and therefore desirable.

Tony

I thought the RPM that the switch over is made was adjustable? Perhaps you can lower it?
What the results/consequnces are of doing so i have no clue!

also, what about the accleration enrichment table. I know its just a look up table based on temp for enrichment, but that may work?

Just tossing out ideas.

Tony

I think of the switch as allowing you to make the AFR YOU want...and not the 14.7:1 commanded at times other than WOT. The way i think of it is...the WOT map is a piggy back ON TOP of the base map to provide more fuel during WOT conditions. Darien and i played with this today for the first time...with some success

Our basic tuning run was from a stand still in 1st...running through the gears into 3rd with the foot to the floor. We hit appx 6200-6300 rpm and oh..130ish plus mph in 3rd. The 3rd gear run was nice as we got a solid 20+ second run at WOT in autotune with a nice gradual increase in RPM over the range of 4000-6300 rpm. We did our runs on a pretty deserted road with a fairly good incline(helped slow the rate of RPM increase). I sat calling out the AFRs as Darien kept his foot to the floor driving. Once this was done we data logged an identical run.....then went into the WOT map and added some fuel at the upper end.

Im still not too familiar with the ST but we pulled up the RPM log and noted the times from the 3rd gear shift...until 6300 rpm at WOT. Using these times I then found the corresponding area on the AFR plot. From here i could see 2 areas where we were just getting above our target AFR of 12.5:1. I then went into the WOT map and added fuel at those areas (question on this later). It was a total guess on how much to add but we inputed "21" into the last two WOT cells which correspond to 4800 and 6800 rpm. I saved this file then we did another identical run...data logging as we went...and me calling the AFRs. It worked! The AFRs were richened up where we wanted them, although just a little too much. I then went back to the two cells(4800 and 6800) and lowered the values..from 21 to 12.…then saved the file again. Thats were we left it for today.
I know that all may be hard to follow for those that havent seen the device or how it works..sorry....but i have video coming

Tony

Best i could do below...for some reason it wont let me enter BOOST?..but yo get the idea

The nice thing about using the 42lbs and the 044 pump is you can keep stock fuel pressures ie. S4 57psi. and still have enough fuel to support the HP your looking for.

30s will work, you will just increase the duty more and have to force more fuel through them via high pressure when they are open.

We are curently getting good AFRs on Dariens car with the 30lbs injectors...his fuel pressure peaks at 75ish

Tony

Some stuff i just put up on YOUTUBE

...autotuning of the base map at idle and cruise. Yeah, the image sucks and you cant read the numbers but it should show those that havent seen how the ST works some idea.

http://www.youtube.com/watch?v=JkHP3wRRPYk

then after that one this...
http://www.youtube.com/watch?v=l88BW98lSro

and the fun stuff...
http://www.youtube.com/watch?v=IK5T1tocXv0

BrianG

Is Darien's car using a RRFPR ?

Darien

Hi Brian,

I'm still using the BEGI for now because I'm not sure if my stock FPR will support WOT fuel pressures. We found that the BEGI can actually supply too much fuel pressure as noted in the beginning. I was hitting 93-95 PSI, and although the ST tuned the correct AFR, I chose to adjust back to 70ish to be safe. I didn't want to blow any fuel lines.

Should be burning my first EPROM with Bill soon and hope to get back to the dyno soon.

Darien

As usual, great camera work Tony

IcemanG17

Sweet videos......with Sharktuner and superchargers......we can get some silly HP out of our sharks and still have great daily driveability!!!

Congrats to John for making such a great product and to Tony and the other tuners who take the time to dial everything in!!

Tony

http://www.youtube.com/watch?v=NU00OMvQWYA

thats the last video after we added the fuel. Not too exciting of a vid, but you can hear me calling out the Air fuel ratios as got into 3rd gear.


Ill also add that we go those pressures after we added the 044 pump. I think the pumps on the 86.5's and older are even smaller than the stock S4 pump. Either way we have more than enough fuel pump now.