I changed the plugs about 2 days ago, last night I mixed some race gas with regular gas about 2 gallons of race and 5 gallons of premium. Will this and 13psi on the Petit ECU give me high end break up? I mainly feel it only on 1st and 2nd, rarely on 3rd.

 

BTW What are the colors of the stock ignition wires? Cause 2 of mine are blue and 2 are black.

 

blue trailing and black leading

 

Sounds like you may be running too rich....feels and acts like breakup sometimes.

 

My stock wires were black.

What octane race gas? If it's say 92 & 103 you are mixing, then you have 96 octane and that should not cause you any trouble. Race gas burns a lot slower so if you push the octane up too far you will "put out the fire" unless you are tuned for it.

 

It was 110 and 93. =/ Maybe thats it plus I should get better wires.

 

Anyone know whats the best wires to get btw?? Magnecore or NGK, or MSD if I can find it in MSD?

 

Throw the HKS twin power in there. I can't say enough about this product.

 

Thanks I want to but I dont have the cash for it atm. Im looking for some in the parts section but Im not getting any answers =/. I want to dyno first without it and then with it and see what happens.

 

Taylor wires but add another gallon or so of 93 first, and see what happens.

Octane is linear so with your combination it is (2/7 x 110)+ (5/7 x 93)= 97.9 or so.

I know my car goes to hell, just sputters like mad off the line, with "too much" 110 & I am tuned for 103.

 

I'll try that, looks like MSD does make a sec, Ive always had a good experience in quality with MSD products so I may go that way.

 

I had the same problem and just changed my o2 sensor. Now the car pulls hard to redline. Change the o2 sensor if its been a while. It worked for me.

R.K.

 

whats the part # for it and what does it go for normally?

 

If you use race gas (lead based) your life expectancy for the O2 sensor goes away......

 

Im well aware of that but just after one mixed tank?? I know race gas burns plugs too but that quick?

 

What's wrong with unleaded race gas? You are not pushing 30 lbs of boost. Plenty of protection for 13 PSI.

 

Theres none around here, I heard about 100 low lead (Av gas) that they sell at Sunoco as well. Maybe thats what I'll get next time.

 

Here is a link for the o2 sensors:www.oxygensensors.com. Hope that helps you out. Thats where I bought mine.

R.K.

 

IIRC, O2 sensors can get coated by the lead in leaded gas and not respond quickly! Did I remember correctly?

 

yup.....

 

Isnt there a part# for a Bosch equivalent? Thats relatively low priced? 77$ for a Denso and 55$ for a Walmer or w/e is price. I saw some "universal" one for 20$

 

I got my O2 sensor from rx7.com. I think it was about $40.

But O2 sensor only plays a role when you are in close-loop. That is under 3700RPM or so. After that you are running off the maps in your ECU.

Someone please correct me if I'm wrong.

Usually new plugs fix the ignition breakup for only for a while if you are running rich.

I'm planning on getting HKS TP for some time now also, but putting it on a dyno to get some AFR readings I think is a must (especially if you dont know how your injectors flow).

 

What does high-end breakup feel like? I was at the track the other day and found that I was getting slight hesitation or stuttering in fourth/fifth gear pulls down the straight. Suspecting that I was getting boost spikes, I turned down the boost a little to be safe (from 10 to 9.5) and it seemed to go away. But could this have been ignition breakup or a similar problem described in this thread?

 

Well I just pulled one spark plug , its brand new (since i replaced them 3 days ago) and I turned down the boost to 11 psi, and it still hesitates =/.

 

Fatman, I'm telling ya, just throw a gallon or two of premium in it to dilute the race gas and see what happens. Easy, cheap & and quick. If that does not work, then you can fool with more obnoxious stuff.

Everytime I went to the track I would indiscriminately add race fuel. If a little is good, "more must be better", right? And under full throttle, I would misfire off the line. And I put in new wires, and three new coils, and a new coil harness, and a new PFS harness for the Purple box, and got a fresh battery, and new plugs, and a Twin Power and cleaned up every ground in town.

After all that, it was the gas mixture, moving the octane down towards what it was tuned on, 103, and the problem went away.

Try the gas first. Race gas burns slow so you have to start the fire sooner so unless you putzed with your timing, there is some level of octane that is going to cause your car to hesitate, sputter and misfire. You may be there, depending on your tune.