DT Headers Dyno Result Thread (3 Viewers)

[RobRed]

I did say above that our plot was smoothed - the plot you posted was REALLY (overly?) smoothed, which I find to be typical of product sales literature.

I'm not trying to argue either but for others who may be reading this thread and are less experienced reading dyno results, I dont want them to misinterpret and think there is something wrong.

My opinion, in answer to your question, is that the ECU is has been programmed to deliver torque down low. Toyota claims peak torque at 3600 RPM and our result is indicative of that. Horsepower is a calculated value based on torque recorded. I dont think an engine designed to peak at 3600 RPM should be evaluated much on what it's doing at 4200.

Oh and by the way I have wood on my dash.

 

[Copenhagen1]

Thanks for doing this. It will definitely be worth the $10 I chipped in. I have a really dumb question though...... what is AFR?

Sorry for the elementary question but I figure if I don't know, probably others don't know as well.

Looking forward to results, how has the header install gone this weekend?

 

[RobRed]

AFR = Air Fuel Ratio

It took quite a while to do it, prob 13 hours. We took food breaks and were not trying to be speedy. We ran into a few snags where we took our time to figure out how to resolve it.

Lexi4Darin's truck is in progress (sitting in my driveway) as were are finishing up today.

 

[CappyKD]

AFR = Air Fuel Ratio

It took quite a while to do it, prob 13 hours. We took food breaks and were not trying to be speedy. We ran into a few snags where we took our time to figure out how to resolve it.

Lexi4Darin's truck is in progress (sitting in my driveway) as were are finishing up today.

Sweet, when's the next set of testing scheduled for?

 

[RobRed]

Thursday 9/8

 

[SHAGGY101]

I've dyno'd quite a few vehicles and it's quite normal to see peaks and valleys in the power curve. We are looking at a smoothed plot but that's not accounting for the changes you're pointing out. These variables can be a number of engine factors making peaks and valleys.

More over it's normal for a 2000 Land Cruiser, we dyno'd a second LC just 10 minutes later to answer these types of questions. The curves were identical.

Time to up date your book

Torque converter?

here are my charts:

https://forum.ih8mud.com/100-series-cruisers/457958-2-wheel-dyno-results.html

 

[RobRed]

Torque converter?

here are my charts:

https://forum.ih8mud.com/100-series-cruisers/457958-2-wheel-dyno-results.html

I've seen your two wheel results and what do you know... same dip in HP curve

What do you mean by TqC? Are you referring to lock-up? If so I think the converter is well past that - roll speed on the dyno must be approaching 100mph.

 

[tarmacblack]

I've seen your two wheel results and what do you know... same dip in HP curve

What do you mean by TqC? Are you referring to lock-up? If so I think the converter is well past that - roll speed on the dyno must be approaching 100mph.

The dyno plot from my LC shows a small decrease in power at the same RPM, it's not as much as yours is but my HP output was substantially lower also.

Could be a characteristic of the cam, could be fueling curve, could be timing curve. Whatever it is, I agree that it's very normal to see this kind of dip in a power curve on a factory calibrated vehicle.

I've spent days in calibration laboratories running Federal Trace Profiles for emissions certifications and sometimes you simply have to back power off in order to hit your emissions target. That could be the case here.

What I find interesting is the difference in your AFR curve and mine. I'm wondering if its a difference in the MY or the altitude. You're pushing low 11:1 afrs, once my cruiser went OL it pegged 12.2:1 (Dyno Chart). Very interesting.

I look forward to seeing the post header results.

thanks for sharing.

 

[lexi4darin]

Torque converter?

here are my charts:

https://forum.ih8mud.com/100-series-cruisers/457958-2-wheel-dyno-results.html

Here is another FJ100 dyno result that substantiates the 4.7 liter's characteristics, including and notably the power curve.

To everyone, the exact numbers at such-and-such RPM are less important than the overall analysis of the data. This was a baseline dyno with upwards of 6 runs (then 4 more runs on a second LC/LX with the same curves). Let's all focus on understanding the natural power curve of the 4.7L, understanding the results of DT header product (results coming Thursday), understanding where there might be areas for improvement, etc.

I'm anxious to see if the DT header product makes the 4.7 liter motor as strong or stronger than the 4.7liter with VVT-i.

 

[lexi4darin]

Lexi4Darin's truck is in progress (sitting in my driveway) as were are finishing up today.

Thankfully my truck is no longer 2 feet in the air nor still in your driveway.

 

[tabraha]

Yes, thanks. Great information, even for those that do not currently have the headers.

Dittto, and who knows, could boost another header GB.

 

[Layonnn]

Dittto, and who knows, could boost another header GB.

If the dyno shows some actual gain, i'll be in.

 

[RobRed]

Dyno about to commence.

 

[Supra88]

Yes! I'd be very surprised if there wasn't a nice increase in HP based on on how the LC responds with theDTs on. I guess we'll let the data speak for itself.

 

[nakman]

so? .

 

[RobRed]

Dyno run completed. I am analyzing the data and will post results back at the top of this thread once I have plots.

 

[SupraTuRD]

Very cool... thanks for stepping up to the plate to do all this testing. It would have been neat to see if the airbox mod with the screw plate made any difference.

 

[RobRed]

Surprises me to see the stock HP number that high. I would have expected to see the wheel number in the 180's or so.

Thanks for taking the time to do the run.

Standby for an update on that.

 

[RobRed]

Results are posted:

Please reread posts 1,2 and 3. I've made some data changes based on new information.

 

[BamaHeel]

Awesome results - 20+ HP and 10+ ft/lbs torque - you should be able to feel that from the seat. Any change in gas mileage?