Detonation

sprstr1000 · 12-22-2009, 12:18 AM

I was talking to guy recently about our engines and the detonation issues they have
he said one of the main causes is the exhaust port is to small

anyone heard of this ?is it true?

Harley#356 · 12-22-2009, 06:54 AM

Nope, not at all.

Detonation issues are a crappy tune, or lackthereof with increased boost and poor gas.

You still having issues you didnt' get fixed yet?

steinjr · 12-22-2009, 09:50 AM

The exhaust ports being too small and the restriction in the #3 port lead to blown plugs, but not detonation.

1BAD4DR · 12-22-2009, 12:49 PM

Bottom line, make sure you get a good tune from a reputable tuner if/when you increase boost and you shouldnt have much to worry about. What pulley combo are you planning on running?

sprstr1000 · 12-22-2009, 01:41 PM

No I haven had it fixed yet,Im waiting till spring,I gonna be takin it to brown bros ford performance division there is a guy there that has a very good reputation

sprstr1000 · 12-22-2009, 01:47 PM

Quote:

Originally Posted by 1BAD4DR

Bottom line, make sure you get a good tune from a reputable tuner if/when you increase boost and you shouldnt have much to worry about. What pulley combo are you planning on running?

right now im runnin a dyno tune from a local place (mopac, they did a good job on my 05 C6)the engine right now is stock with a 4# lower,intake,jba shorties,magnaflow highflow cats,magnaflow cat back.it came back at 359hp an 432tq an do date a best time of 13.69@100mph on 22s full weight

ive got a 6# goin on in the spring and gonna gettin retuned at brown bros ford
that should keep a smile on my face the my built motor is done

Harley#356 · 12-22-2009, 02:16 PM

Quote:

Originally Posted by steinjr

The exhaust ports being too small and the restriction in the #3 port lead to blown plugs, but not detonation.

I don't think the exhaust ports cause any issues with plugs blowing out since even N/A trucks have issues blowing plugs just as frequently, with the same exact heads and manifolds, and guys have run the stock manifolds up to 600 RWHP. I don't think the exhaust is really a restriction causing plug issues, or detionation issues for that matter. If anything the coolant path could be a possible one for detionation, guys do the coolant crossover mod to improve cooling to decrease the chances for detionation, but thats still in more extreme conditions. sprster's truck is pretty stock with basically just a 4 lb lower (2 lbs of boost), and some exhaust mods that don't gain any power.

Quote:

Originally Posted by sprstr1000

No I haven had it fixed yet,Im waiting till spring,I gonna be takin it to brown bros ford performance division there is a guy there that has a very good reputation

Thats going to bite you man! Detonation is something that is cake to fix, a simple adjustment of the tune, and it can bite you HARD if you dont get it sorted out, especially in the winter with cooler temps and crappier quality gasoline. You're playing with fire. Bet you didn't even get a wideband yet did you?

sprstr1000 · 12-22-2009, 05:51 PM

Quote:

Originally Posted by Harley#356

I don't think the exhaust ports cause any issues with plugs blowing out since even N/A trucks have issues blowing plugs just as frequently, with the same exact heads and manifolds, and guys have run the stock manifolds up to 600 RWHP. I don't think the exhaust is really a restriction causing plug issues, or detionation issues for that matter. If anything the coolant path could be a possible one for detionation, guys do the coolant crossover mod to improve cooling to decrease the chances for detionation, but thats still in more extreme conditions. sprster's truck is pretty stock with basically just a 4 lb lower (2 lbs of boost), and some exhaust mods that don't gain any power.

Thats going to bite you man! Detonation is something that is cake to fix, a simple adjustment of the tune, and it can bite you HARD if you dont get it sorted out, especially in the winter with cooler temps and crappier quality gasoline. You're playing with fire. Bet you didn't even get a wideband yet did you?

Yes i did get a wideband
Im drivin somethin else for the winter months and the HD will be retuned before its a DD in the spring

Harley#356 · 12-22-2009, 07:48 PM

what are the A/F's looking like when you're seeing detonation?

1BAD4DR · 12-22-2009, 10:14 PM

^ what he said...cant say that enough

sprstr1000 · 12-23-2009, 02:23 AM

It doesnt do it all the time but when it does it usually happens during WOT shifting to third it is usually fine in first or second but 80% of the time when she hits third it starts
the A/F is around mid tens when it happens

'02 H-D #677 · 12-23-2009, 02:58 AM

Quote:

Originally Posted by sprstr1000

it starts
the A/F is around mid tens when it happens

Pretty fat/thick for detonation! IMO, you have a bad gauge or something else goin' on. Get it in to your tuner.

Harley#356 · 12-23-2009, 06:22 AM

if you're seeing 10.0's on the A/F gauge, you've either got a detonation problem soley on the passenger bank where the A/F isn't monitored, meaning a bad/clogged injector or something (very unlikely), or its not detonation your hearing. Detonation doesn't happen at 10.0 A/F's, thats rich as chit! Did you calibrate your wideband correctly?

sprstr1000 · 12-24-2009, 12:57 AM

I had a shop do the install (I know i should do the work myself but I get lazy sometimes)
I will have to dig up the instructions If I still have them
its definitly detonation !!!!!

Harley#356 · 12-24-2009, 06:12 PM

well if your wideband shows 10.0 and you have detonation, like I said its either an isolated issue on the other bank, or that wideband is calibrated wrong. Either way I wouldn't be using that shop again!

12-22-2009, 12:18 AM	#1 (permalink)
sprstr1000 Registered User Join Date: Aug 2009 Location: canada bc Posts: 121 View this user's gallery iTrader: 0 / 0%	Detonation I was talking to guy recently about our engines and the detonation issues they have he said one of the main causes is the exhaust port is to small anyone heard of this ?is it true?

12-22-2009, 09:50 AM	#3 (permalink)
steinjr needs more cowbell! Paid Member Join Date: Sep 2005 Location: Fort Worth, Texas Posts: 3,402 NHTOC member #: 427 View this user's gallery iTrader: 5 / 100%	The exhaust ports being too small and the restriction in the #3 port lead to blown plugs, but not detonation. __________________ Yes officer... I am aware of how fast I was going! graphic by S\|ck

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12-22-2009, 06:54 AM	#2 (permalink)
Harley#356 Worlds Fastest HD F150!!! Paid Member Join Date: Jan 2003 Location: Week-Philly; Weekend-Souf Jerz Posts: 29,512 NHTOC member #: 3 View this user's gallery iTrader: 0 / 0%	Nope, not at all. Detonation issues are a crappy tune, or lackthereof with increased boost and poor gas. You still having issues you didnt' get fixed yet?

12-22-2009, 12:49 PM	#4 (permalink)
1BAD4DR Registered User Join Date: Oct 2009 Posts: 62 View this user's gallery iTrader: 0 / 0%	Bottom line, make sure you get a good tune from a reputable tuner if/when you increase boost and you shouldnt have much to worry about. What pulley combo are you planning on running?

12-22-2009, 01:41 PM	#5 (permalink)
sprstr1000 Registered User Join Date: Aug 2009 Location: canada bc Posts: 121 View this user's gallery iTrader: 0 / 0%	No I haven had it fixed yet,Im waiting till spring,I gonna be takin it to brown bros ford performance division there is a guy there that has a very good reputation

12-22-2009, 07:48 PM	#9 (permalink)
Harley#356 Worlds Fastest HD F150!!! Paid Member Join Date: Jan 2003 Location: Week-Philly; Weekend-Souf Jerz Posts: 29,512 NHTOC member #: 3 View this user's gallery iTrader: 0 / 0%	what are the A/F's looking like when you're seeing detonation?

12-22-2009, 10:14 PM	#10 (permalink)
1BAD4DR Registered User Join Date: Oct 2009 Posts: 62 View this user's gallery iTrader: 0 / 0%	^ what he said...cant say that enough

12-23-2009, 02:23 AM	#11 (permalink)
sprstr1000 Registered User Join Date: Aug 2009 Location: canada bc Posts: 121 View this user's gallery iTrader: 0 / 0%	It doesnt do it all the time but when it does it usually happens during WOT shifting to third it is usually fine in first or second but 80% of the time when she hits third it starts the A/F is around mid tens when it happens

12-23-2009, 06:22 AM	#13 (permalink)
Harley#356 Worlds Fastest HD F150!!! Paid Member Join Date: Jan 2003 Location: Week-Philly; Weekend-Souf Jerz Posts: 29,512 NHTOC member #: 3 View this user's gallery iTrader: 0 / 0%	if you're seeing 10.0's on the A/F gauge, you've either got a detonation problem soley on the passenger bank where the A/F isn't monitored, meaning a bad/clogged injector or something (very unlikely), or its not detonation your hearing. Detonation doesn't happen at 10.0 A/F's, thats rich as chit! Did you calibrate your wideband correctly?

12-24-2009, 12:57 AM	#14 (permalink)
sprstr1000 Registered User Join Date: Aug 2009 Location: canada bc Posts: 121 View this user's gallery iTrader: 0 / 0%	I had a shop do the install (I know i should do the work myself but I get lazy sometimes) I will have to dig up the instructions If I still have them its definitly detonation !!!!!

12-24-2009, 06:12 PM	#15 (permalink)
Harley#356 Worlds Fastest HD F150!!! Paid Member Join Date: Jan 2003 Location: Week-Philly; Weekend-Souf Jerz Posts: 29,512 NHTOC member #: 3 View this user's gallery iTrader: 0 / 0%	well if your wideband shows 10.0 and you have detonation, like I said its either an isolated issue on the other bank, or that wideband is calibrated wrong. Either way I wouldn't be using that shop again!