Dyno tune increase mpg?

[88fiveohGT]

Would a dyno tune get me any increase in fuel mileage over the standard predator tune i have in the L now?

[mnstang]

i'd say so, yes.

[289Notch]

depends; if you are richer than stoich at closed loop and mid throttle then the answer is YES.

This question seems impossible to answer with no info.
You aren't gonna get any worse milage with a new correct tune while not on the gas.

[88fiveohGT]

Well assuming diablosport programs in an extra rich tune to compensate for variables with different set-ups i was thinking it could be leaned out some which would net slightly better mileage while bumping up the power too. It rarely sees boost though so I was curios to know if anyone had experience from changing from a standard held held tuner program to a dyno tune for mileage.

[TRDon]

probably not enough to justify a $500 cost.

[Hack]

probably not enough to justify a $500 cost.

This makes sense to me. Unless you drive a ton of highway miles.. But I would expect most "standardized" tunes to be "safe" (meaning rich). The stock tune is normally somewhat rich as well. So I expect it would be possible to save something. However, under WOT you'll still get really crappy mileage.

[Macs Stang]

In my case yes, because I switched at a time to 42 lb/hr injectors and my car ran super rich. Rich enough to carbon up the plugs with in a few min. So in my case yes.

[HTMtrSprt]

If you already have a Predator the tune time on the dyno is $150 per hour. Most cars take a little over an hour to tune. The predator tune wants you to run 91 octane fuel in most circumstances. If you have a stock compression engine premium fuel is a waste of time. The way we tune on a predator is: run on the predator tune and log the result, return to stock and log the run, then custom tune the car. Our guarrantee is that if the predator tune makes equal or more power than our custom tune, there is not any charge for the tune time or dyno time. As far as fuel economy, in closed loop the system should be active and running the AF at 14-18 depending on a bunch of feed back sensors. The biggest thing is the spark curve to maximize your set up. Too much and too lean and it "Pings". Too little and it does not maximize the fuel charge in the cylinder. You can talk to Casey while he is doing your tune if you have any questions.

Bart

[dynotune]

MOST of the time on the lightning you will NOT gain any MPG with a custom tune over a predator tune (this applies directly to lightning) If you want you can take your global spark adder in the modifer on the predator and add 1-2 deg, and then pull out 1-2 @ WOT (between 2-4k and 4-7k, or however it's labeled in that one) That way it will increase the timing at part throttle, and pull the timing back out at WOT (for safety sake) Yes, you can make a few more HP than the diablo tune, but then you are nearing the ragged edge- although it is good to double check the A/F and make sure it's OK. The stock tunes are not RICH on any vehicle, except at WOT. If you are worried about fuel consumption at WOT, drive a lawnmower. The biggest thing on a lightning is be careful on the timing (the only point that MAY gain you a little mileage) and CHANGE THE FUEL FILTER OFTEN! If it starts to ping, change the filter. Depending on what year your L is, the filters are too small and if they start to get restricted they restrict fuel flow. Usually need to change the filter every 10k or less if moded. You don't need to pay anyone for a custom tune, you can make the changes you need to make in the predator already.
Just my $.02

[Sweet35th]

MOST of the time on the lightning you will NOT gain any MPG with a custom tune over a predator tune (this applies directly to lightning) If you want you can take your global spark adder in the modifer on the predator and add 1-2 deg, and then pull out 1-2 @ WOT (between 2-4k and 4-7k, or however it's labeled in that one) That way it will increase the timing at part throttle, and pull the timing back out at WOT (for safety sake) Yes, you can make a few more HP than the diablo tune, but then you are nearing the ragged edge- although it is good to double check the A/F and make sure it's OK. The stock tunes are not RICH on any vehicle, except at WOT. If you are worried about fuel consumption at WOT, drive a lawnmower. The biggest thing on a lightning is be careful on the timing (the only point that MAY gain you a little mileage) and CHANGE THE FUEL FILTER OFTEN! If it starts to ping, change the filter. Depending on what year your L is, the filters are too small and if they start to get restricted they restrict fuel flow. Usually need to change the filter every 10k or less if moded. You don't need to pay anyone for a custom tune, you can make the changes you need to make in the predator already.
Just my $.02

Although I agree with you 100% about the fuel filters on Lightnings, both them and V10s are notorious for having issues with them. It has been in my experiance, and my opinion that the Diablo tunes are usualy TOO agressive. Usualy have WAY too much timing down low and do not pull out nearly enough for air charge temp, and in some cases too lean simply because of factory discrepancies in MAFs...... I feel (and as I said this is my opionion) that any lightning or cobra should at the very least be dyno'd to check A/F and spark advance if they are using a non-custom tune. I have seen WAY too many Cobras and Lightnings running mail ordered, generic diablo, or even SCT tunes that are too lean and way to agressive.

Now 88Five0GT, some of the earlier lighting calibrations (CUX* cals for example) can pick up some milage by correcting some of thier convertor lock/unlock issues.. This mainly only help at freeway cruising were some of these calibrations would unlock the convertor with very little change in TP in compairison to later cals, which hold lock-up much better. I have had some people report back as much as 2mpg gain on freeway trips.. But around town driving, LIghtnings just dont get very good fuel economy. Thier heavy weight combined with the blowers very quick boost reponse means they have to transition into open-loop fuel very quickly as you come into boost, and as you know accelerating away from a stoplight or stopsign without getting into any boost is VERY hard to do and takes massive will power......Realisticaly, if you want to get good milage with your lightning, pull the blower belt off. John M. who used to post on this board before moving back to texas actualy got 21mpg in his lightning on a trip to Iowa when he pulled his blower belt. Compaired to the 16.5mpg I got on the same trip

[OrangeCrush 86]

A lightning will run if you just pull the blower belt with no tune modification?

[Sweet35th]

A lightning will run if you just pull the blower belt with no tune modification?

Yup. They are slugs, but they run just fine. Still a mas air vehicle.

[88fiveohGT]

Well I take trips up to moorhead about every 2 weeks so maybe i'll have to try pulling the belt before i leave. cruising 70-75mph it pulls 15-16mpg with some weight in the back. I'll report back on the belt difference.

[Fosters]

Yup. They are slugs, but they run just fine. Still a mas air vehicle.

that's crazy!