06-19-2021, 04:38 PM | #1 |
Enlisted Member
6
Rep 31
Posts |
Dyno results....
I strapped the M235 to a chassis dyno known as the ultimate heart breaker.
383whp 430wtq. My Bootmod3 data-log was cutting in and out and only have about 13 seconds of data. Boost is 18.7. My AFR is in the 12.1 range. Big kudos to Jordan for the custom tuning for 93 octane. In addition to the obligatory upgrades are Dorch HPFP, Snow Meth injection, 1 step colder NGK plugs. |
06-19-2021, 05:37 PM | #2 | |
Lieutenant
74
Rep 410
Posts |
Quote:
|
|
Appreciate
0
|
06-20-2021, 04:54 PM | #4 |
Lieutenant
74
Rep 410
Posts |
|
Appreciate
0
|
06-21-2021, 09:05 AM | #6 |
Captain
1104
Rep 736
Posts
Drives: Lexus RC F
Join Date: Nov 2019
Location: Florida
|
Stock snail running out of steam.
__________________
Estoril Blue E36M3
Mineral Grey M235ix/12.02 @ 115 Ultra White Lexus RC F |
Appreciate
0
|
06-21-2021, 09:12 AM | #8 |
Joint Chiefs of Staff
24204
Rep 190,807
Posts |
It looks like the dyno operator let go of the gas paddle after 5000rpm
__________________
Check out our current sale by clicking on this link!
https://x-ph.com/sale/ Phone number 702-494-9435 |
06-21-2021, 11:00 AM | #10 | |
Joint Chiefs of Staff
24204
Rep 190,807
Posts |
Quote:
You are correct, to looks off
__________________
Check out our current sale by clicking on this link!
https://x-ph.com/sale/ Phone number 702-494-9435 |
|
Appreciate
0
|
06-21-2021, 07:10 PM | #11 |
Enlisted Member
6
Rep 31
Posts |
Again....This tuner uses a Mustang dyno. A pro shop used to tune drag cars. It's not a Dynojet! Hence the lower numbers.
Let's use the Dynojet's translation, which became a rule of thumb on automotive forums for manual transmission cars. The percentage changes based on if the car is automatic (20%) or even all wheel drive and automatic (25%). Here we have the total following the Dynojet logic: WHP Mustang: 383.5 @20% Dynojet: 460.1 Mustang: 383.5 @25% Dynojet: 479.4 A good read: https://www.igotasti.com/threads/mus...am-maker.5230/ |
Appreciate
0
|
06-21-2021, 11:11 PM | #13 | |
Brigadier General
2283
Rep 4,146
Posts |
Quote:
|
|
Appreciate
0
|
06-22-2021, 08:54 AM | #14 | |
Joint Chiefs of Staff
24204
Rep 190,807
Posts |
Quote:
Did you show the dyno to Cary? If so please let us know what he says about the sudden drop. He's the expert, if the drop is intentional, he will have a good reason for it.
__________________
Check out our current sale by clicking on this link!
https://x-ph.com/sale/ Phone number 702-494-9435 |
|
Appreciate
1
spidy512494.50 |
06-22-2021, 09:32 PM | #15 |
Major General
5556
Rep 5,372
Posts |
Given that this a Mustang Dyno and the car is running meth with a custom tune, this N54-like powerband doesn't surprise me one bit.
It's very common for EWGs N55 on meth to make huge power to around 5000-5200rpms and then die out quickly, comparitively speaking to the massive power gain from 3500-5200rpms. Mustang Dynos make this effect way more pronounced, especially if the dyno operator is applying a good amount of brake to increase load. This N55 is seeing around 260whp at 6000-6200rpms on the Mustang Dyno. That would be around 320whp on the Dynojet. About what I'd expect from this mod combo. The gear dynoed in can also be a factor. Personally, I'm not a fan of these diesel-like powerbands, but the car will still be quite fast. I certainly do not agree that AWD sucks out 25% power to the wheels. It's more like 15%. The RWD 6MTs see about a 10% loss. On a Dynojet this car will make ~420whp and 460wtq. Definitely good for low 11s in XDrive. Last edited by XutvJet; 06-22-2021 at 09:39 PM.. |
Appreciate
0
|
06-23-2021, 01:21 AM | #16 |
Brigadier General
2283
Rep 4,146
Posts |
Even if the Mustang dyno has a 8% reduction (about standard) vs a Dynojets, those numbers still don’t make sense. The car loses 100whp in 1000RPM, which is ridiculous regardless of whatever dyno platform you use.
On a EWG with meth, you’re also not making peak power at 5000rpm, unless the tuner is tying to tune it like a PWG turbo |
Appreciate
1
spidy512494.50 |
06-23-2021, 09:24 AM | #17 | |
Major General
5556
Rep 5,372
Posts |
Quote:
|
|
Appreciate
1
spidy512494.50 |
06-23-2021, 01:27 PM | #19 |
Brigadier General
2283
Rep 4,146
Posts |
No. Read the post above mine.
__________________
Mods: Yes.
|
Appreciate
0
|
06-23-2021, 02:12 PM | #20 |
Major General
5556
Rep 5,372
Posts |
I still don't buy it. The OP said his data log was short and the data cutting in and out. How can they determine a boost leak was occurring with weak data?
Also, power was very strong right up until 5200rpms, well after peak boost was made. There appears to be no issues with power from 2000-5200rpms and max boost was likely occuring at 2500-5000rpms and then tapering. If you're going to have a leak, one would think you'd see it when max boost was happening. If anything, the AFR could be going a bit rich in the upper rpms hence the power drop after 5200rpms. It could be a tuning issue or perhaps the DME was seeing knock and dumping fuel and closing the throttle. Like I noted earlier, other EWG N55s have shown similar power bands with meth where power ramps up to ~5200rpms and then plummets, some worse than others. For reasons I can't totally explain, meth changes the shape of the power band and pushes peak power to the lower 5000s vs lower 6000s like we typically see on EWG N55s. Perhaps a turbo efficiency thing. PWG N55s on meth tend to see peak power in the 4800rpm range and then drop. Yuck. |
Appreciate
0
|
06-23-2021, 03:37 PM | #21 | |||||
Brigadier General
2283
Rep 4,146
Posts |
Quote:
Quote:
Here is MY datalog and notice I make peak boost closer to 6000RPM https://datazap.me/u/amuroray/log-16...ta=3-4-5-15-24 Quote:
Quote:
Quote:
https://f30.bimmerpost.com/forums/sh...1622618&page=2 Same car:
__________________
Mods: Yes.
|
|||||
Appreciate
0
|
06-23-2021, 11:41 PM | #22 |
Major General
5556
Rep 5,372
Posts |
- I do not believe "BMW DIY Guy" had meth on his F30 N55. I thought he did the HPFP only.
- Mustang dyno numbers are wildly variable because the operator can apply brake to increase load. That's why they're so freaking great for tuning. You can essentially tune the car for street driving like grades and such. A Dynojet is a very simple dyno, more for measuring power than tuning. A Dynojet can't vary load. The measurement is simply how quickly the motor can spin a 2,000lb drum over a given amount of rpm and time. It's crazy simple and generally repeatable. - I do not see anything on the dyno plot suggesting the Mustang dyno numbers are being converted to reflect Dynojet numbers. I've been modding cars since 1995, spent countless hours on various automotive forums since the dial-up age, have dynoed many of my cars, and I can't recall any shops converting Mustang dyno numbers to Dynojet numbers. Again, it's totally an apples to oranges comparison. However, Mustang dynos definitely show much lower whp/wtq numbers than a Dynojet and it often confuses the crap out of most people that don't understand the differences in how the power is measured. - It would help if we knew which gear the OP dynoed in as it greatly influences turbo load and ultimate numbers. - You'd be surprised at the difference in the power curve if this car was dynoed on a Dynojet. It's also VERY common for Mustang dynos to show a 200-300rpm earlier peak in the power curve vs the Dynojet. Why? I have not clue but I've seen the phenomenon on a number of cars over the years that dynoed on Mustangs dyno and then Dynojets or vice versa and no changes in mods/tuning. I have not a clue why it happens. It's above my pay grade. - I'm not saying definitively that there might not be an issue here, but I'm not seeing evidence of a boost leak. If anything is happening, my guess is meth delivery and DME reaction, especially after 5200rpms. - Like I've said earlier, this huge surge in power followed by a quick drop in power is common to meth injected BMW turbo motors and most any meth injected car for that matter. With the HPFP upgrades now, I don't know why you'd want to use meth.
__________________
The forest was shrinking, but the Trees kept voting for the Axe, for the Axe was clever and convinced the Trees that because his handle was made of wood, he was one of them.
|
Appreciate
1
spidy512494.50 |
Post Reply |
Bookmarks |
|
|