Have a question for ya...my car was missing when it warmed up.....so I ended up swapping out the spark plugs to NGK's 4554's. Installed those earlier today and she ran fine. My question to you guys is this. How do your cars (6-speeds) run below 2,000rpm? Mine does not like to be run below 2k....the shifter begins to vibrate a bit and a miss here and there.....like the engine is working harder. Once I shift from 6th into 5th and keep the rpm's 2k or above, she smooth as can be? Is this normal or am I missing something? Thanks for any input.

 

I can cruise in 6th at 40mph no problem. About 1050 RPM. But its probably not a fair comparison with all your mods.

 

hmmmm, what can be my problem then? If I am below 2k....my engine seems like it's choking......my tranny shifter seems more rough....could it be the tune? my car what dyno tuned.....

 

Well it could be 1 of 2 things. You have a miss or its just cam surge. My car will cam surge like a Bi+ch even with the 3.90 gears. Before the gears my car was horrible to drive at like 20-30mph in 2nd gear it would surge all the time. It could also be a miss. Misses show up a lot easier when you are in a higher gear at a lower rpm. I guess you should be able to tell the diff. between cam surge and a miss.

 

Hawk350 I have the xe230/236 cam 112 lsa and my car does the exact same thing. Like you say it does not like to be below 2000 rpm, like when I'm in parking lots in 2nd gear moving slowly the car starts to shake. I was told it was just a bit of cam surge. I adapted my driving style since then (shift a bit higher) and it's fine now though. I also heard the cam surge is reduced if you get gears, but I see you have 3.73's. I may go to 4.10's in the near future.


I wanted to ask you... Is your car harder to get going from a stop? Like sometimes when you come to a complete stop and then go do you have to give it more gas than usual or it will bog down? Just wondering...

 

Yeah, i hear ya. I have been adjusting my driving and shifting 2-3k and highway driving 2k+ I wish I has 4:10's so I can use 6th and less than 80mph.

 

Mine does the same thing with the cc306, i have to be above 2k or it will surge a little. I have just learned to live with it...

 

Ya, thats the conclusion that I am coming to....

 

Your tuning needs some fine tuning. You either have too little timing down low or too much (causing KR). I had suffered from the latter and once the KR was removed I only had cam surge below 1200-1300rpm.

 

It sounds like you have a miss or a dead cylinder. I was running on 7 cylinders for a while. The car would vibrate under load in 6th gear. Once I changed out the plug wires, it runs fine. I have gotten it to pull 6th gear from about 55 with 4.10s.

Try spraying water on the primaries. If one of them doesn't evaporate as fast, that would indicate a problem. That's how I found my problem.

The 4.10s make it drive almost exactly like stock at low speed. I can even start off in second gear. In a way, second feels like first used to with the stock 3.43s. I don't really get much in the way of cam surge. Usually it's around 1500-1800 RPM and very light throttle. It starts bucking a bit. Giving it more throttle will usually stop it.

 

how do I test for a dead cylinder? My car seems to have plenty power... I have 8mm wires, new....ran them on top of the valve covers, they are definately not touching headers...

 

He just told you how to check for a dead cylinder right there.

 

ok, just mist the wires...I will do that and see what happens....is thee anything else I can try?

 

He said to mist the primaries. Primaries = header tubes.

 

What could misting the wires possibly tell you??