LordBritish

I got Tillman's All-out 91 octane tune installed and sometimes my car pings - or at least something seems to be rattling.

I assume it's pinging because that's what it sound like - sort of a raspy, metallic sound. Does that sound like pinging/detonation?

I live in the socialist republic of California where 91 octane is about the highest octane you can get.

I increased the WOT Fuel richness by 2% (XCal2) and it seems to improve the pinging/detonation.

Perhaps Seafoam will help as well?

GONE_N_60

I had the same thing with my Brenspeed tune.They suggested retarding the timing by 1 interval in the RPM range giving you the issue. I think it should do the trick.

I noticed that the recent change in weather in my area has seemed to help the issue for me before I adjusted the tune.

It could also be a bad tank of gas with all the stuff added to fuels. Chevron always works well for me.

Americanboy86

I always use Chevron too. I read an article from a third party organization that ran tests on gasolines from the major producers (BP, Shell, Chevron, etc.) and it concluded Chevron was the best gasoline for engines (cleaning, mpg, etc.). I tend to agree...never had any problems with Chevron fuel!

ski

Give Seafoam a try. FWIW, it eliminated a pinging problem on my 05 GT.

LordBritish

How do you use Seafoam on an 05 GT?

GONE_N_60

Not an 05 gt, but the same principles should apply.

http://www.youtube.com/watch?v=Ef3HNvxblxQ

jedikd

Same issues here with my 91 All-Out in California, I stopped using it until I get a tune update from Tillman Speed.

mdun6

I had the same problem with the Tillman 93 Street Race Tune. My car would ping like crazy on hard throttle. I took my car a local shop and had it dyno'd. I think we ended up taking 10 degrees of timing out and in the end gained a couple HP. DON'T nobody get me wrong i am NOT slamming CR or Tillman Speed, they never had the car to dyno it themselves and I feel for the most part i am still running the Tillman tune it's just tweaked a little. I would take 6-8 degrees of timing out of 4000 - 8000 rpm range and that should help till you can get it on a dyno.

LordBritish

What would happen to the engine if I didn't stop it from pinging?

mdun6

You could damage the engine. .... CR left end user adjustment in my tune so i just took out 6 degrees untill I got it dyno'd or you could just not drivr it hard till you get something done with it.

theedge67

Dude, you are so wrong it is not even funny. Pinging is NOT valves hitting the pistons. That would cause catastrophic engine failure, grenade style. Pinging is also called spark knock, or detonation. Basically it is the fuel/air mix in the cylinder lighting prior to the spark plug firing. This causes an uneven flame wall inside the cylinder, and causes extreme pressures inside the cylinder. This is bad for the engine, and is why modern engines have knock sensors that will retard the spark timing to help cure the knocking/pinging/detonation. It still happens in tuned Mustangs because many times the knock sensors are either disabled by the tuner, or they are simply unable to compensate enough for the massive knocking caused by an improperly tuned engine.

ski

Dump it into an almost empty gas tank while at a station immediately prior to filling up. It took approx. 200 miles of driving for the pinging to disappear on my car. I drove in the lowest gear that was feasible(2nd and 3rd around town, 3rd on the highway) so that the engine was always running at higher rpm's(after it was fully warmed up of course). This caused the gasoline to flow at high velocities thru the injectors and into the combustion chambers, which maximized Seafoam's scouring effect on any carbon deposits, varnish, etc. And forget about trying to get good gas mileage on that tankful. The purpose of using Seafoam is to clean out the engine and injectors as effectively and efficiently as possible.
If the pinging subsides but does not completely disappear when the tankful is almost gone, then dump in another can. It's only about $7.

GONE_N_60

I got my pinging dialed out today with the help of the awesome folks at Brenspeed. I needed to pull some timing in various rpm ranges.

But I think I want to try the Seafoam now after what I heard about it.

LordBritish

I heard you should put part of the Seafoam bottle in the tank and part of it someplace else - not sure where though.

TillmanSpeed

6-8 degrees of timing pulled out from our tune?!?! That's absolutely positively related to an outside source. Whether you went somewhere that they misinformed you, or you had 87 equivalent running a 93 tune. 6-8 degrees is absolutely nuts. We dial every 93 tune in for approximately 29-31 degrees of timing depending on ethanol content, tune type, etc. For us to send you a tune with 35-38 degrees is ****-near impossible.

There must have been another factor left out. Give me a shout I'd like to find out some more info.

LordBritish, give me a shout and we'll browse over your file together on the phone. It may just be the quality of 91 in your area, but we took that into consideration. California throws up a red flag when we calibrate. Either way, I'll get you running good! I want to send over one of our files. I know 2% fuel seems to get rid of it, but only because you're cooling cylinder temperature and allowing for more timing. That could be a temporary fix. Let me do my magic on it and you'll be in good shape!

ski

Some can be poured into the oil crankcase, and some can be sucked into the air intake side of the engine with the help of a vacuum line. But one has to be careful on the latter procedure in order to prevent hydro-locking the engine.

GottaHaveIt

interesting I had a brand new rebuild 351 Clevland in my 1977 Cougar and gas from Shell was fine my second fill I was leary as I was dang near empty I popped in $20.00 of Chevron and it pinged like a bad lifter so I then filled it all up with Premium at Shell and no ping so I never used Chevron again ! to bad they didn't have Fordron eh !

mdun6

6-8 degrees of timing pulled out from our tune?!?! That's absolutely positively related to an outside source. Whether you went somewhere that they misinformed you, or you had 87 equivalent running a 93 tune. 6-8 degrees is absolutely nuts. We dial every 93 tune in for approximately 29-31 degrees of timing depending on ethanol content, tune type, etc. For us to send you a tune with 35-38 degrees is ****-near impossible.

There must have been another factor left out. Give me a shout I'd like to find out some more info.


CR. You knew I had to take out timing from the 4000-8000 rpm range, I'm not blaming anyone or saying you gave me a tune with that much timing. If i recall correctly it was somewhere around 29-32 degrees but for whatever reason my car will ping with that ammount of advanced timing. The place I had dyno it just tweked your file to make it stop pinging and accually gained 2.5HP or so. I have the dyno sheet and I can upload it or maybe I could send you the file off my SCT for you to look at which would really make me feel at ease that you think it's ok.

GONE_N_60

That's crazy! I had the opposite happen to me with Shell. It seemed to give my car indigestion on the stock tune. I only put like 10 bucks worth in it because I would rather run Chevron but I was in a pinch.

Different region I suppose

It's also hot as donkey butt out here too during the summer. So many little things to consider with this car. This is my first sports car so was used to just filling it up with anything and going about my merry way.

Oh well.

gmantheman

I am wondering if the metallic sound I am hearing is pinging as well. I will take some timing out the tune and see if that helps.