Cool... btw, I haven't had time to post a full commentary on CPRacing's fantastic job of tuning my car. (THANK YOU, ERIC & RALPH!!!) Will do so as soon as I can get my dyno videos uploaded to the ZDayZ site to link them in.

 

quick question about dyno tuning: does tuning on a dyno carry over safely to street driving?

 

yes as long as its tuned on a load based dyno like the mustang dynos..... dynojets are not good idea to use when tuning

 

thank you kind sir.

 

Yeah using the load bearing dyno really helps improve drivability, and making sure it will be safe on the street, that’s the main reason we got a dynodynamics dyno.

 

It would be nice if they also posted the HP from the load based dyno's instead of converting the numbers into what a dynojet would give them . It funny that a load base dyno is a real world , real hp reading and every one keep posting converted to dynojet numbers . Its not good to tune on a dynojet because it isnt what the car would see on the street . But a load base dyno gives you what HP you would see on the street . Load based dyno's are more accurate , and more repeatable . Guys are shocked as hell when they have been told thier car made 340whp , when the last time they dynoed was on a dynojet and got 400whp .

 

387whp on a dynjet would be around 330-340 on a load based dyno

 

CPRacing should be able to post my uncorrected numbers for me by simply removing the correction factor. All the data they handed me was corrected.

My local Z club does dyno days at a place with a Dynojet... whenever the next one occurs, I'll be sure to go and get a comparative run.

 

The reason we have the corretion factor is because in our area there are a lot of dyno jet dynos in this area, when people talk hp around here they talk dyno jet numbers. A lot of people in this area don't understand that load bearing dynos read lower yet they are better for tuning. The main thought that goes through their head is wow their dyno reads low lets go someplace eles. That is the reason we do the correction factor. We use about a 13 percent correction

 

It's a bummer a buisness would lose money because of a mans EGO . But thats basicly what it comes down to . We have 2 Mustang Dyno's in town and the operator of one says....they come to him to tune...and go straight to a place 50 miles away that has a Dynojet for a big number .

 

Very true. And as long as CP maintains the correction factor, which they do, then all is good. The number is irrelevant...you are just looking for the delta.

 

Many don't understand that oem software may [usually does] have different factors depending upon the gear one is in, to correct for rpm rise per second [load] on the road and use different factors with AC on and with rising coolant temperature [Summer protective mode vs load].

Problem with tuning on any dyno in just a single direct gear [4th or 5th depending].

Same with wind load simulation on the drum. The dyno rpm acceleration should as close as possible simulate the time [in each gear] for a similar track acceleration.

 

what about tuning via the ecu with the car physically at ts or aam?

 

Question I would like to ask is what difference does it make if you are tuned on a load based dyno or an non load based dyno? So long as the A/F ratio is somewhere around 11/12 on non load and timing is in a safe area what difference does it make.. Do both of these values change depending on what machine your on?? A load based dyno more closely replicates street driving which places a more realistic load on the engine? Is the A/F ratio a function of engine load..Understand the hp and tq #'s will be different between the two..Appreciate any insight..Thanks

 

True... btw, my delta from bone stock to now is +192rwhp!

 

It makes a huge difference. When I tune cars, like Todd's on an inertia dyno, you have to dial in the A/F ratios and timing, and then road tune the car. Since the dynojet doesnt put nearly enough load on the motor after 5000rpm or so, its important to double check the boost buildup, and the A/F ratios particularly at higher RPM's. You can still get a great tune out of dynojet, it just takes more time, and more effort.

With a load based dyno, you can simulate the precise load that the car experiences at a given RPM and load factor. For instance, on a flat road, lets just say that a 4th gear pull from 2500rpm to redline takes about 8 seconds. We can dial this ramp rate into the dyno, so the load is nearly identical to what would be experienced on the road.

This is why CP Racing chose to get a DynoDynamics dyno, vs. the less expensive dynojets. Its a more precise and faster tune, and offers faster sampling rates, and superior datalogging....among other benifits.

 

Thanks for the reply. If I am tuned on a non load dyno to an A/F ratio of 11.5 and pulling say 6 deg's at 6k, boost is 8 psi and take it out on the road and my Zietronics reads same values then is this equivalent to what a load dyno tune provides in terms of safety and optimal power?

 

Very close, but not as precise across all the different load points. At WOT, is probably very close. From a safety perspective, its hard to say without looking at the tune. But if your A/F ratios look roughly the same as seen on your inertia dyno, then you are likely fine.