victor25

I installed 2 kits at the OCIC, Seans car, and Robs car. Robs car started right up and runs awsome. And we all know whats happened with Seans car. The only difference is that Sean supplied his own injectors & PEMS.
One thing is for sure, every kit that leaves my office will come with the injectors and chips I supply. NO short cuts or discounts!!! That is the only way we know for sure that the car will run spot on right out of the box with no hickups like this.

Ed Scherer

Another Bosch injector data info source:

Bosch Injector Data (as an .XLS spreadsheet)

Doesn't contain timing info either, but does contain some other useful info (e.g., spray angle).

rgs944

The car is running very nice and I am sure Sean's soon will be too. I really like the mild boost of this kit. I have usable power even at the lower rev range. Since it is not a twin screw I did not expect it would feel so nice in traffic but it does.

John Speake

You can still keep those injectors for now, just extend the opening time on the parmeters screen of the ST2 - start with 2mS as suggested.

Then it should behave itself, and enable you to use the correct # setting. It should then behave more logically - probably needing you to reduce the hot cranking pulse width somewhat.

victor25

+1 with John

Sean I think your injectors will work just fine now that you have them figured out. But if you decide to take them out, I will gladly sell you a set of the ones that come with the sc kit, and hook you up with the LH and EZK files that match.

SeanR

The injector opening time is set at 1.95 for the past day and a half, works just fine. I think where people are getting confused is the setting for the crank pulse width on hot motor. That is where I have it set at 4.85 and where the problem was.

Bill Ball

OK, Sean, I did not understand that it NEVER restarted well once warmed up. I still think something is odd about all this. I've worked on a number of supercharged cars (mine, George Suennen's, others) with 30lb, 36lb, 42lb, and higher injectors and never had to fiddle with these pulse width parameters to get the cars to start and never saw the injectors fail to respond.

SeanR

Just went to go buy more of this Rotrex Traction oil since it all seems to have leaked out. Whollychit, $100.00 per bottle.

Ed Scherer

Now there's some good incentive for not having leaks.

AO

Wow! Glad you're getting it sorted out. I've told a lot of people this and I'll just re-state it 'cause I know a lot of people are following along at home:

Many people think the hardware installation of a supercharger is what takes the most time, when in reality it's the tuning. I would conservatively say it's 20% hardware / 80% tune. And if you're isn't in 100% good condition, you could be chasing problems for months or years.

Also, at the boost levels you're running (sub 8psi) the tune is relatively easy. Anyone running 10psi or more knows stuff begins to fall apart and complexity increases 10 fold.

We are very lucky to have people like John Speake and Jim Corenman that help shorten the learning and tuning curve, but it's still a large undertaking.

Welcome to the club Sean!

dragonflyjones

Sean! You're finally a "Boostard"! What took so long!?!?

jeff spahn

This makes me want to boost my S4. New head gaskets, check. Intake refresh, check. Everything else seem to work, check.
All I need now is a check.

SeanR

You are not kidding, and thanks for the advice you have put out there.

Timid about doing it on my own car, after doing yours and the trials/tribulations. It is my daily driver after all

I can tell you right now, you want to do this. I've not got mine "tuned" right so I've been going pretty easy on the gas, but damn, this is a nice feeling and can't wait to get it dialed in properly. Victor has been great on the support also.

rgs944

"Also, at the boost levels you're running (sub 8psi) the tune is relatively easy. Anyone running 10psi or more knows stuff begins to fall apart and complexity increases 10 fold." AO


That is why I always said I want to stay at modest boost. 6 or 7 Psi feels kind of natural for the car. As much as I would love to feel that 13lbs of boost, I also want improved performance but with reliability. I am confident this modest and well designed kit provides that. I also will not be beating the car up at full throttle very often. For me, the little punch it gives at partial throttle throughout the rev range is plenty of enjoyment. It really has transformed the car into something more modern. Sure you do have an initial investment, but look at the cars that cost 5 times more and you can now run with them and likely beat a lot of them. It sounds cheap to me compared to making payments on a newer Vette, Viper or 996.

John Speake

Hi Sean.
Your figures are in fact logical. The cranking pusle width is a stand alone parameter and does not use the setting of injector opening time that the main maps use.

So with stock injectors and an open time set at 0.9mS then the actual inj open time is 3.3mS when the cranking pule length is set to the default 4.2mS.

With your lazy injectors, opening in (say) 2mS, then with a set value of cranking pulse at 4.85mS your actual inj open time is 2.85mS - 0.45mS less than for 19# injectors which seems about right.