Anyone experience spark blow out?
 

Anyone get spark blow out or something similar when VTEC kicks?

Or should VTEC be disabled on turbo cars?

if youre blowing out spark either your ignition system is too weak or your gap it too much

Im at .028 right now. I have read that people are using 16. Still on stock external coil.

.16?! No

what engine?
Ecu?
Mods?
Tune?
Oem external coil huh?

what engine? H22A4
Ecu? AEM EMS
Mods? .50 Trim, 272/280 cams .505 lift

Tune? in process and its running 11 - 11.5 AFR with 4 lbs. boost 18-19 degrees timing at 4lbs. Knock voltage averages .8 and lower.


Oem external coil huh? Yep its got an external coil.


I was kinda suspecting the coil is weak since its a 97.

Wires look factory to me.

there a reason why youre pulling about 10 degrees of timing for 4 measly pounds?

Just a starting point. I used to have it at 22.

I know 4 is low. Its where I wanted to start out.

please stop touching your car and take it to someone that knows what they are doing

I have to save up 600$ to do that.

Its not that I dont know what I am doing its that the EMS is foreign to me. I tuned the Evo I had myself on 22 lbs. of boost, NOS 75 shot, with methanol inj and ran 12.2 at 110.

pretty obvious that you dont, youre comparing a maf to a map system.

on four psi you should be able to get away with stock gap if not very close.

No offense, but you have to pay to play.

If you sunk all the money in the car, why risk it by "tinkering" - spend the money and get it done right.

Dedspool said advance advance advance smooth set 2step at 6700 and boom done deal

The things I dont know I am learning. I do know that hondas are map and evos are maf. My point was that I didnt blow up the evo so I must know something.

I would think so also that it should be fine with stock gap so thats why I asked. I dont know what honda guys do for ignition on boost.

depends on the motor, most will say 1 degree per pound of boost, on pump on SOME motors i have found this to be not enough, but its case by case. Lock your timing with the ecu, put a timing like on it to make sure your base timing is set or else your whole curve will be fucked, go from there.

[ ..

I will when I get my tax return regardless of what happens. If it croaks it give me a reason to pull the engine and have it sleeved.



Yes sir. thats the first thing I did. I set base timing at 15 degrees. My ignition map is set at 1 degree per lb. I think I am gonna raise it back to 22 degrees tomorrow and check for knock.

I also think I will replace the plug wires and coil. Then test again.

what knock sensor are you using? If it's oem then your wasting your time with that.

very true. any single wire knock sensor is going to give you shit for readings.

You're always going to have knock.....more so if you have stiff mounts... False knock and real knock... Knock sensor isn't gonna be able to pick the two apart..

This is false, cars equipped with more sophisticated knock sensors have better range, this with the way the ecu looks for knock lets it separate what's real from false. Only high end ems's can replicate this. example would be, the ecu will only register a knock count at certain points in the combustion process not all the time.

What do you guys use?

I unhooked my balance shaft also so I am sure that the extra vibration is from some of the readings.

I drove my car today and did a 3rd gear pull with VTEC off and didn't get any misfire. Which is good.

A Dyno

do you have it tuned for vtec? could it just go super lean and begin to detonate when you add all that entra air?

Get it tuned plain and simple. Or atleast run some logs of the a/f on the street and get the a/f in a target range. Thats pretty simple to do with the right ecu aem/s300 etc.

Thats what I am doing. I saw some pulls on dynos and didnt see vtec engage on the preludes.

Im actually almost done tuning it without vtec enabled.

Might as well pull the turbo off and go back to a p13 ecu......

Im gonna let UMS tune it when I get $600 and they can enable vtec again. My primary lobes are almost as big as my stock primaries.

wut? You mean your current primary lobes are as big as your stock secondaries?

Pretty close man. Lol I'll look up the specs again

here they are.

Honda Prelude Type SH cam :
IN: .465 , EX: .445 <--- .465 = 11.8 mm

Current cams
Intake Lift : 12.8mm / Intake Duration : 272 or 0.503
Exhaust Lift : 11.9mm / Exhaust Duration : 280 or 0.468