This is not a honda but a sr20det making about 350whp car is tuned really conservatively and we have even taken another 3degrees of timing off towards the end of the map (while we work through another issue) car doesn't detonate at all on the dyno, its a dynapack.

Tuner doesn't think it really is detonating, I DON"T get a knock reading in the lower gears but once into 4th and 5th it is quite severe. Seems more prevalent if going up hill.

THe added load have something to do with this??

ANy input would be good.


Modified by turbozxi at 6:30 PM 9/5/2007

 

my friends s15 did this all day. the cam sensor was a tooth off and way advanced. make sure your base timing is dead on.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by boostedcivicsir &raquo;</TD></TR><TR><TD CLASS="quote">my friends s15 did this all day. the cam sensor was a tooth off and way advanced. make sure your base timing is dead on. </TD></TR></TABLE> Thanks I'll look into it but it would most likely detonate on the dyno to wouldn't it?

I should add I am not maxing out 4th or 5th not nearly just acclerating for a couple of seconds.

 

What are you using to determine if you are experiencing actual detonation ?
A lot of "newbs" think missfiring is detonation....

 

I should record my YZ490's engine.. that is detonation... sounds like a bolt is being slapped into the head by the piston... weirds peopel out thinking the motor is gonna explode...

anyways, what did you use to tune? is the AFR correct in these gears? it could be a per gear fuel trim issue, or tranny gear ratio setting...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mtber &raquo;</TD></TR><TR><TD CLASS="quote">What are you using to determine if you are experiencing actual detonation ?
A lot of "newbs" think missfiring is detonation....</TD></TR></TABLE>

sounds like 2 hammers smacking together.

 

tuned on dyno in 3rd? theres more load in 4th and 5th so if uve got a stoner tuner, maybe they wouldnt account for that?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mtber &raquo;</TD></TR><TR><TD CLASS="quote">What are you using to determine if you are experiencing actual detonation ?
A lot of "newbs" think missfiring is detonation....</TD></TR></TABLE>



i might be one of them.

 

You can generally get away with a half *** tune through the first 3 gear, but it's when you hit 4th and 5th is when the tune really shows it's true flaws.

 

I used to think my ignition break up was detonation lol Easy fix of the spark plug gap and i was good to go.

 

You're positive it's detonation? If it's severe enough you can hear it ... Something is off. What are you tuning with?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by alpha &raquo;</TD></TR><TR><TD CLASS="quote">You're positive it's detonation? If it's severe enough you can hear it ... Something is off. What are you tuning with?</TD></TR></TABLE> I have a Power FC the tuner is very experienced... You guys would love the cars at that shop trust me.

Nah dyno'd in 4th am using the knock detector that is built into the Power FC it most likely is going to be just a false reading I think.. Unless you guys think there is more load on the road then on dyno and the difference is enough to cause knocking... Its unlikely.

 

It's most likely a false positive. Only way to tell for sure is to pull a fresh set of plugs during a pull

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by alpha &raquo;</TD></TR><TR><TD CLASS="quote">It's most likely a false positive. Only way to tell for sure is to pull a fresh set of plugs during a pull</TD></TR></TABLE> To do this do you have to turn the car off right after a pull? You can let it slow down aye?

 

To properly do it, you have to check the plugs in mid pull.

 

could it possibly just need a tighter plug gap?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ndogg &raquo;</TD></TR><TR><TD CLASS="quote">could it possibly just need a tighter plug gap?</TD></TR></TABLE> Not sure currently it is misfiring as the timing is retarded.. But that doesn;t give a knock reading I don't think.

 

100 mph wind puts alot of extra load on the motor especially that box on wheels you call a 240 (just joking).

 

this is interesting because ive got a turbo civic also using a power fc and it also shows knocking 70 in 4-5th only from 5.5-6.5K rpm but the car dose not make any noise or missfire at or really seem to loose any power. and when looking on the commander it reads 60-70 but on my fc-datalogit program it reads like 9-10. still havent figured it out. mayby boost spike? im not sure. more thoughts would be great


Modified by b16spaz at 2:43 PM 9/30/2007