Well I took my car to the 1/4 mile track last night. put in 112 race gas, launching at the rev limiter and the clutch just touching then on the last yellow light launching WOT, best reaction time .071 worst reaction time .201

First run with 20psi of boost.....12.9 seconds, second run with 21psi of boost....12.7seconds, third run with 24psi of boost......12.5 seconds, fourth run with 27psi of boost..... BOOM!!!! CLANK CLANK CLANK CLANK CLANK CLANK... KNOCK KNOCK KNOCK KNOCK....GRIND....SHUTTER SHUTTER.... car died.... wont start.... Its not an intercooler pipe either. All i got to say is i did exactly what i was told by 2 companies (will not meantion whom)

Am taking the head off tomorrow and seeing how bad it is.

 

ouch....hopefully it's not something toooo bad.

 

I see the insinuation, but running 27psi on 112oct is fine - not a thing wrong with it, so whatever may have happened isn't because you were given poor advice.

 

Ouch, sorry to hear that.

What are you using for fuel management? The stock ECU and all aftermarket reflashes (except one company) have high and low octane maps for safety. That way, if you get too much timing or become a little lean, the safety map can take over and protect your car.

I never turn up my boost at the track, its just kind of risky. Going from 20psi to 27psi is pretty dramatic without monitoring equipment hooked up to your car, though.

 

Not really. Tons of us turn our boost up at the track on race gas and have been doing so for years. Not sure why you'd say it's risky other than you having a large turbo. Regardless of the high/low maps, the ECU still pulls timing when it sees knock.

 

t-case?

 

did it start to smoke?

 

i spike the '03 to 27 but i taper it down from there as the stock ignition can't keep up & WILL misfire. maybe the guy was shifting too high, stretched the head & snapped a timing belt. i've seen that happen. or maybe he didn't get all the supporting mods with his cam install causing his cams to smack the inside of the valve cover. who knows. i guess he'll have to pull it apart 2 find out...

 

Every Dynoflash map I've pulled with ECUflash does NOT have high/low maps, because Al makes the values the same. He's the only reflasher I've ever seen who does this, BTW. And thus the ability to dramatically pull timing is taken away from the ECU's authority range.

Ultimately, if the owner of the car turned up the boost from 20 to 27psi on his own, the destruction of his engine is his fault.

I was just stating that the dual maps have the authority range to cover a huge error in judgement like this.

We don't know what his race gas mix ratio was, how accurate his boost gauge is, or how old the race gas was.

He can't blame it on the vendor if he turned the boost up himself, but making vast adjustmsnts at the track (like a 7psi increase)without tools to monitor fueling and timing is not a good way to keep your engine running for a long time.

 

Regardless, he can turn up the boost like that on 112 even with a mix. Many of us have done it many times - it's not a big deal. And as I said, regardless of how the maps are made, the ECU can still pull timing. It doesn't matter what the low octane map says.

 

Have you ever tuned a car with a reflash? Do you really believe what you're typing? Of course the low octane map matters; I've seen cars that were on the edge jump maps on the dyno several times. That's why Mitsubishi put different maps in there, and that's why EVERY other reflash vendor retains these maps.

Do you understand the map grid? The ECU follows by load cell. On the low octane map, it has the potential to pull a ton more timing than the parameters it can pull in the high map (or twin map in this case).

In the Dynoflash cars, there's not another map to jump to. If its too far past the edge from what the single (identical twin) map can compensate with timing and fuel, sayonara engine.


You and others might've gotten away with it, but maybe you had better race gas/mix/less than a 7psi variation/who knows.

 

you sound like u know what u talking about...so i go with you...

 

Sorry, he just thinks he knows more than he really does. Unfortunately, we can't divulge any tuning secrets just to appease his skepticism. The ECU can still pull timing - it doesn't need the low octane map to do it.

 

regardless of whether the map can pull enough timing, going 7psi over what you were tuned for without any monitoring equipment isn't a recipe for longevity.

It's not an ecu's fault if you made a poor decision - live and learn.

It's also hard to believe that any vendor would release a 20psi map and then say it's okay to run 27 on race gas with the same settings...from a liability standpoint that's just not good business.

 

Bah, you guys at like Evos haven't been doing this for the duration of their existence. We run 21-22psi on 93oct, and you can run as much boost as the stock turbo can give you on race gas even without a change in tuning. In fact, when we change the tuning on race gas + boost, we LEAN OUT the AFRs _and_ add timing. So, not changing the tuning is even safer, because the AFRs and timing are not as aggressive.