I just got my ECU back from you a couple of weeks ago (Buschur Stage 1 Flash). The car runs great and I have no complaints so far. When you sent it back to me you put in there not to run any more boost than 21 psi.

I just installed a Walbro fuel pump and I plan on taking it out to the dragstrip this weekend and get some passes in it. Will I be able to run race gas and turn the boost up, if so how much boost and what octane fuel do you recommend me running?

Last but not least, I believe I read somewhere that with the reflash the fuel cut feature is eliminated on the ECU. Is this true? If so what will happen if the car over boosts and senses knock? Since the fuel cut feature is eliminated will the car still pull timing if it senses knock?

Sorry for all the questions I just want to get everything cleared up before I take it to the track.

-Leonard

 

If you use race gas your going to need to pull some fuel out. Like with a AFC. If you don't have a way to pull some fuel out you should just run it on pump gas. It'll save ya a sh*tty time at the track.
Yes your car will still pull timing if it sees knock.

 

Were you flashed for the Walbro pump? If not you'll be running richer and you'll need to pull even more fuel out if you want to take advantage of the race gas. Removing the fuel cut has nothing to do with ECU sensing knock. As evo 8 ya says, I would run pump gas until you are able to tune for race gas. If not you'll probably be dissapointed on how your car will perform at the track.

 

Its an equation. Your ECU might pull timing at the track under heavy load and that might cause you to loose some power. On the other hand, if you use race gas like C16 or C12 you will run extra rich and you will be wasting your money on race gas for nothing. If you run 93 gas you might face some knock (maybe, maybe not). If I were you I would do this, our ECUs learn to some point and they adapt to the environment to a point, if you go with race C16 gas as I stated above you wont make any power but if you MIX gas (93 and 100) you will end up with 96~97 which will most likely no let you see any knock and the ECU will not pull timing under load. You wont be making much more power but hey you wont be loosing any and you will run safer and faster

 

^^^^Good advice.

Try to get to the track with just a couple gals. of 93.
Then put 2 gal of race gac to sweeten the mixture.
Most tracks sell unleaded 100; I suggest using this.
You want to up the octane to get rid of any detonation; any higher and it's wasted. Here's why ...

Higher octane gas has 2 interestings properites:

1. - It's harder to ignite
2. - It burns slower

Advantages:
#1 is how it helps with detonation issues. And you can also go to a leaner A/F.
#2 lets you add timing.

Disadvantages:
#1 - with the stock (richer) A/F, you may not ignite all the fuel. Great for EGTs but for power, not so much.
#2 - with stock timing and really high octane (C16) you could actually lose power, because
point of maximum detonation is happening too late relative to piston position.
We are only talking a couple of degrees, but it can be noticable.


So again, add just enough of the sweet stuff to take away any det. problems you may see.
Without a method to adust A/F (SAFC) and tweak timing, more will be a waste of money.

 

I disagree with most of this advice

My advice is go to track with near empty tank, pour in 3 - 4 gallons of a good leaded race fuel and turn the bost up to 24 psi peak

You can report back to us what kind of difference this makes in your trap speeds

Have fun !

 

Thanks for the advice. Im gonna make my first few runs on 93 octane and see how it goes. My goal is to get in the 12s with the BR stage one kit. If I cant do it on pump gas I will do like Al said and dump in a few gallons and see what happens.

 

but don’t you think that running 96~97 gas is better than running 93? even if your tune is completely safe any tune could face bad gas or bad weather right?

 

But dont forget to make sure the pump gas is almost all out and then turn UP the bost with the race gas - that is how you make the extra power

My flahes are all set up to work with this method

 

how much can you turn up the boost with race gas ????

 

Read what i wrote above

 

Well I went to track and just ran it on pump gas. My best was 12.97@107.9. Im very pleased with the way the car is running. Thanks to Al for the flash and to all the guys at Buschur Racing for making a great kit (stage 1). Boost was around 19 psi, maybe 20 tops.

 

Al, Did you mean what you wrote.? Is it "Leaded Race Gas" or did you want to say "Unleaded Race Gas".

MachC5

 

Congrats on breaking into the 12's! It's good that you tried out your runs on pump gas. Now you know that you made it into the 12's without having to use race gas. Next time you could try out Al's advice, run some race gas, turn up the boost and run even quicker

 

The highest unleaded gasoline availabe is I believe 104 octane. Everything above that contains lead and shoud not be used with a Catalytic Converter.