Less than expected dyno results.

[Isaleus]

Like the other said. Each Dyno is different.

https://www.supramkv.com/threads/what-did-you-do-to-your-supra-today.2074/post-351502

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[zrk]

Asking for a friend - don't we also typically do dyno pulls in 6th gear?

5th

 

[jRuN]

5th

All of my pulls, the shop did them in 6th...

1. I thought you typically dyno in the gear closest to 1:1 ?

2. If my pulls were done in 6th, what kind of change if any would I expect to see to the numbers if redone in 5th?

3. Now that my baseline and subsequent custom tune runs have been done in 6th, am I forever beholden to doing dyno pulls in 6th?

 

[COLLINS]

All of my pulls, the shop did them in 6th...

1. I thought you typically dyno in the gear closest to 1:1 ?

2. If my pulls were done in 6th, what kind of change if any would I expect to see to the numbers if redone in 5th?

3. Now that my baseline and subsequent custom tune runs have been done in 6th, am I forever beholden to doing dyno pulls in 6th?

It could just be an AT vs MT difference. In the AT 6th gear is 1:1, in the MT 5th gear is 1:1. You are correct though, dynos are typically run in the gear that is 1:1, or as close as possible, though technically it’s just math, so you can still calculate at a different ratio.

 

[PikkaGTR]

Need a stock baseline
Dyno difference is what matters
One car stock 390---tuned 430 dynojet
One car stock 330---tuned 430 mustang Dyno
One is much faster than the other

 

[bk5]

2. If my pulls were done in 6th, what kind of change if any would I expect to see to the numbers if redone in 5th?

3. Now that my baseline and subsequent custom tune runs have been done in 6th, am I forever beholden to doing dyno pulls in 6th?

It's not a big deal, so long as the operators got the gear ratios configured correctly. You do 1:1 because that's technically the most efficient gear ratio, but the difference is negligible and well within the margin of error.

Sometimes operators have to use a lower gear because the wheel speed at redline in the 1:1 gear is well over the top speed for the car.

 

[ColonelAdama]

Got the car dynod today after getting a JB4 installed on the map 1 configuration, and disappointingly it only pushed 352 whp on a 5th gear pull, and 344 on a 4th gear pull.

For reference I'm running a catless downpipe, cold air intake and the jb4 on map 1. I was expecting somewhere in the mid 400's but results showing less than advertised for a stock supra surprised me.

Unsure if there's something I did wrong or I had my expectations to high, or if anyone else has also had a dyno result similar to this after installation of modifications.

Yes we were in dyno mode on the car as well as sport mode. Any advice would be appreciated or things to check to see why the results might be lower would be awesome.

Post dyno chart and JB4 datalog. catless DP MUST be tuned for...

 

[Turrizm]

Also, what was octane of the gas? map 1 with downpipe seems conservative unless you have low octane gas I guess.

 

[Hardac_]

Listen to ColonelAdama, he knows his stuff. He helped me get to pretty good power with 415bhp and 456ftlb. This was during a rain storm with shop doors open, about high 70s, on 93 octane Shell pump gas.

The only thing I don't see often mentioned often in these threads is a different spark plug and gap recommended by BM, specifically a colder heat range plug with gap at 0.022".

 

[ColonelAdama]

Listen to ColonelAdama, he knows his stuff. He helped me get to pretty good power, as posted, with 415bhp and 456ftlb. This was during a rain storm with shop doors open, about high 70s. This was on 93 octane Shell pump gas.

The only thing I don't see often mentioned often in these threads is a different spark plug and gap recommended by BM, specifically a colder heat range plug with gap at 0.022".

View attachment 122150

Thanks!

~40whp/~60wtq gains are pretty spot-on for JB4 on 93 octane. Of course it is only the gains that matter and not the overall number, as it is dyno dependent.

 

[EddieNel]

Try not to get too hung up on the numbers. I can’t tell you how many dyno numbers I’ve seen and the car reading the lower hp number be faster then the car with the higher numbers on paper. Every dyno seems to read a little differently. I agree with all of the above. The base line and end dyno tell you what you have accomplished with that set up.

 

[SuupYota]

Yea bro, not the size of the wave, but the motion in the ocean, uh er something..

 

[Dr. Supra]

on my 2022 i dynoed 380/416 on 93…..stock

 

[kern417]

I see you're in california. I'm assuming you only have 91octane fuel, and it's known that Cali 91 is worse than most. The numbers on dynojets don't vary that much in my experience other than potential elevation changes/compensation. My bet is your bad fuel quality is why you have low numbers.

I would check logs to make sure your car is handling the boost well before making any more changes. As easy as these cars are to mod, good quality fuel is key to making power, safely.

 

[Loco38SUP]

Without knowing what stock Supras make on that dyno any help will be difficult.

A local dyno shop consistently has stock Supras make 350whp/350wtq. With this in mind modded hp numbers will be lower than expected.

-RJM

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