DYNO Results - Stock vs AA Downpipe (Manual Transmission Supra)

[SupraGTS]

Recently installed an AA Downpipe on my 2023 Supra (MT).

Put it on the Dyno before, made 235.5kw (315hp for the Americans) at the wheels.
After the AA Downpipe was fitted, ran the car again and made 255.3kw (341hp) at the wheels.

An increase of 18.8kw (25hp) just with the AA Downpipe - An increase of around 8.5%.

To put all of this in perspective, a standard Automatic Supra on the same dyno will usually make around 210-220kw (280-295hp). It was expected the Downpipe would only add around 5-10kw (7-13hp).

Very happy with this result.

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[SupraGTS]

Its sad that some in the world still get the 335hp first gen B58. But it's still plenty quick though.

It's not the first gen B58. It's the 6 port 382hp engine.

The power is measured at the wheels with no correction for drive-train loss. It's how it's done here.

From what I have seen, US dyno numbers are higher than Australia but looking at trap speeds in drag races, our cars trap the same with a lot less power (on paper).

 

[Sub-MkV]

It's not the first gen B58. It's the 6 port 382hp engine.

The power is measured at the wheels with no correction for drive-train loss. It's how it's done here.

From what I have seen, US dyno numbers are higher than Australia but looking at trap speeds in drag races, our cars trap the same with a lot less power (on paper).

Yeah I realized that after I posted that. Also that dyno is not the same as a dynojet or mustang dyno.

 

[razorlab]

Both the two port and six port are 2nd gen B58.

 

[zrk]

It's not the first gen B58. It's the 6 port 382hp engine.

No Supra has a first gen B58. They are all B58TUs. 2 port vs 6 port has nothing to do with the engine generation.

Edit: oh- @razorlab already said that.

 

[razorlab]

From what I have seen, US dyno numbers are higher than Australia but looking at trap speeds in drag races, our cars trap the same with a lot less power (on paper).

That is incorrect. They read differently because the dynos in Australia spin backwards.

 

[eliotrw]

SO this is super interesting, just a few things i want to clarify.

I have an Auto pre ECU lock version (Jan 2020) so there are some differences between our cars and as you point out the major one will be the Losses between Manual and Auto, with auto's usually having higher losses.

But the main point of interest for me is that i believe we have otherwise similar spec in UK as in Australia (and japan and europe) which is to say the following really:

2port B58
Sport valve is basically always open regardless of mode
and crucially OPF's are fitted.


I'm pretty sure then, that like in UK, maybe you can't touch the OPF legally?
But you are OK to get a sports cat as long as you pass an emissions test?


So are you saying, You still have the OPF, but have fitted the Sports cat (assume 200cell?) and gained all that power while being road legal?
If so i'm probably going to do the same as you, as well as a stage 1 remap and i'm happy to leave it there with the assumption that this sport cat will add similar power on top of the stage 1.


One final question, Any difference in sound???

 

[Kujiwara]

It's not the first gen B58. It's the 6 port 382hp engine.

The power is measured at the wheels with no correction for drive-train loss. It's how it's done here.

From what I have seen, US dyno numbers are higher than Australia but looking at trap speeds in drag races, our cars trap the same with a lot less power (on paper).

The whp numbers in NA are mostly uncorrected too hence the "whp". I think the difference between Aus and NA is most of the time different because of the popular dynos used in both regions. Dynos aren't as international as people think. It's mostly meant for calibration purposes anyways so it just has to be consistent, doesn't really matter if its 340whp or 370whp unless you're trying to get an engine certification as an OEM.

3.0 GTS does appear to be rated the same as the 21+ 3.0 in NA and you mentioned that trap speed is similar so I have no doubts about it, I think defs just the dyno differences.

 

[Sharocks]

Maybe try Haltech's dyno?

Scott might be able to get those numbers up haha

 

[SupraGTS]

No Supra has a first gen B58. They are all B58TUs. 2 port vs 6 port has nothing to do with the engine generation.

Edit: oh- @razorlab already said that.

You are missing the deleted comment from another user telling me my car had a Gen 1 engine.

 

[SupraGTS]

SO this is super interesting, just a few things i want to clarify.

I have an Auto pre ECU lock version (Jan 2020) so there are some differences between our cars and as you point out the major one will be the Losses between Manual and Auto, with auto's usually having higher losses.

But the main point of interest for me is that i believe we have otherwise similar spec in UK as in Australia (and japan and europe) which is to say the following really:

2port B58
Sport valve is basically always open regardless of mode
and crucially OPF's are fitted.


I'm pretty sure then, that like in UK, maybe you can't touch the OPF legally?
But you are OK to get a sports cat as long as you pass an emissions test?


So are you saying, You still have the OPF, but have fitted the Sports cat (assume 200cell?) and gained all that power while being road legal?
If so i'm probably going to do the same as you, as well as a stage 1 remap and i'm happy to leave it there with the assumption that this sport cat will add similar power on top of the stage 1.


One final question, Any difference in sound???

It's a bit louder, I dont know, maybe 20%. Not really night/day difference. Still to quiet for my liking but better than stock. Gets a few more crackles and pops if thats your thing.

 

[Extreme Power House]

Nice results, thank you for sharing

 

[GRMan]

SO this is super interesting, just a few things i want to clarify.

I have an Auto pre ECU lock version (Jan 2020) so there are some differences between our cars and as you point out the major one will be the Losses between Manual and Auto, with auto's usually having higher losses.

But the main point of interest for me is that i believe we have otherwise similar spec in UK as in Australia (and japan and europe) which is to say the following really:

2port B58
Sport valve is basically always open regardless of mode
and crucially OPF's are fitted.


I'm pretty sure then, that like in UK, maybe you can't touch the OPF legally?
But you are OK to get a sports cat as long as you pass an emissions test?


So are you saying, You still have the OPF, but have fitted the Sports cat (assume 200cell?) and gained all that power while being road legal?
If so i'm probably going to do the same as you, as well as a stage 1 remap and i'm happy to leave it there with the assumption that this sport cat will add similar power on top of the stage 1.


One final question, Any difference in sound???

The Australian Supra has the same spec as the US and Japan, not the UK or EU.

That means no OPF and the 6 port higher power B58.

The only mechanical difference (as far as I know) between the US and Australian model is the muffler which the Australian model uses the EU muffler.

 

[GRMan]

The difference in dyno reading between an Australian and US dyno has been around for decades. I remembered a flashed Evo 9 on an Australian Dynodamics was around 300hp and it was around 340hp on a US dyno on average. The quarter miles (0-400) trap speed were similar so one can deduce they make similar hp dispite the different dyno readout

 

[fireball]

that sounds about right . my late 2019 model made 289whp on a dyno dynamics. when i put on a high flow catted downpipe and a e30 tune it made 405whp on the same dyno (different day though)

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