|
|
06-28-2011, 03:43 PM | #23 | |
BimmerPost Supporting Vendor
92
Rep 1,064
Posts |
Quote:
With high octane fuel the ECU will very much hit it's ignition targets (Stock) and make best power. The Dinan car is quite clearly hitting it's ignition targets. The car we tuned is on 91 and will not hit ignition targets as you can clearly see and nor are we forcing ignition. The sudden drop and rising of the ignition is quite normal at high rpm's. Will vary from run to run. Last edited by Sales@Evolve; 06-28-2011 at 03:57 PM.. |
|
Appreciate
0
|
06-28-2011, 03:45 PM | #24 | |
BimmerPost Supporting Vendor
92
Rep 1,064
Posts |
Quote:
Doesn't work like that. Dyno numbers will change from day to day. No stock car was tested on the day so do not try and compare to a stock car. The fact is that primary decats add power. This is a fact. The tune we do is specific for decatted cars. |
|
Appreciate
0
|
06-28-2011, 03:46 PM | #25 |
Sheetrock Intl.
28
Rep 128
Posts |
very uneducated about dynos, but can someone help differentiate between "blotmans" and "mindless-spades" cars, and the reason for the difference in output?
from my glossed over pov, blotman is running a little more boost, temp was 10 degrees cooler, but retains his stock cats, and gets about 70 lbs more torque at a lower rpm. |
Appreciate
0
|
06-28-2011, 03:49 PM | #27 | |
BimmerPost Supporting Vendor
92
Rep 1,064
Posts |
Quote:
The differences aren't huge. Tyres and wheels also play a role in power output. |
|
Appreciate
0
|
06-28-2011, 04:10 PM | #28 |
Private First Class
4
Rep 169
Posts |
I think the boost gauge was acting all wonky for my run. For wheels, I was running 18" Apex on Yokohama Neova Ad08. Don't remember what Mindless Spades was running, but I was expecting quite a bit more due to his Akrapovic Evolution system.
|
Appreciate
0
|
06-28-2011, 04:29 PM | #30 | |
Major General
2740
Rep 5,478
Posts |
Quote:
It's threads like this that make hanging around these forums worth it, awesome stuff.
__________________
Last edited by Richbot; 06-28-2011 at 04:34 PM.. |
|
Appreciate
0
|
06-28-2011, 04:33 PM | #31 |
Major General
2740
Rep 5,478
Posts |
I wonder if the reduced exhaust restriction on the car with the Akra exhaust caused lower boost? Way back when I had a positive displacement blower on a car the boost dropped 2-3 psi when I went catless, but made more power thanks to reduced IAT's and better exhaust flow
__________________
|
Appreciate
0
|
06-28-2011, 05:19 PM | #32 | |
BimmerPost Supporting Vendor
92
Rep 1,064
Posts |
Quote:
Here is the stock full throttle ignition target for an M3: With high octane fuel these targets will be met. With 91 US they simply will not. Light knock is detected and the ECU is continually pushing and retarding ignition. You can 'force' ignition by raising the preset ignition maps by quite a few degrees. |
|
Appreciate
0
|
06-28-2011, 05:23 PM | #33 | |
BimmerPost Supporting Vendor
92
Rep 1,064
Posts |
Quote:
Even an old MSS52 ECU can continually advance and retard ignition! |
|
Appreciate
0
|
06-28-2011, 05:26 PM | #34 |
///M
158
Rep 3,195
Posts |
quoting wrong person?
__________________
2011.5 AW/FR E92 M3 6MT
|
Appreciate
0
|
06-28-2011, 05:30 PM | #35 | |
Colonel
471
Rep 2,991
Posts |
Quote:
That wasn't my point, I was actually curious as to whether or not the stock rear section becomes a bottleneck as power goes up. I don't doubt that primary decats add power. What I am curious is that for cars with the turner test pipes, that retain the stock secondary cats but remove the primary cats, do you think any adjustment would be necessary, vs a fully catless tune? (I'm asking selfishly because I run the Turner test pipes with stock secondary cats too) I've found that nothing behind the primary cats makes a lot of power, if the primary cats are in place. What I'm curious is that if the primary cats are removed, do the secondary cats and/or the stock rear section become a bottleneck? -k |
|
Appreciate
0
|
06-28-2011, 05:36 PM | #36 | |
BimmerPost Supporting Vendor
92
Rep 1,064
Posts |
Quote:
- the rate of knock advance/retard based on the frequency and type of the knock detected - Store knock values as adaptive values and these will then apply to overall ignition advance - Alter the overall ignition offset based on fluid temperatures These are just the basic things. Anyway, not to go off topic! |
|
Appreciate
0
|
06-28-2011, 05:44 PM | #37 | |
BimmerPost Supporting Vendor
92
Rep 1,064
Posts |
Quote:
The rear exhaust does not really become a bottleneck in our tests which are not for the purposes of marketing material. If we concentrate on gains and forget the final figures it all falls into place nicely. If we try and compare different cars on different days the results are not so consistent. What we find is that we get roughly the same gain with an Akra/Evolve/Supersprint/ AA X Pipe with both stock rear silencer and any rear exhaust from the above mentioned companies. We have fitted rear exhausts to cars on their own and the results are very inconsistent. Sometimes there is a gain, other times not. More recently where we have really become strict and data log every test we seem to gain very little power at all with a rear exhaust. That's when we compare runs where the ECU is being allowed to hit ignition targets before and after the rear exhaust is fitted. Typically most tuning companies will take the lowest and highest power figures and then compare the results for marketing! Typically run 1 or 2 is compared to run 7-20!! The ECU would never hit it's ignition targets or the temperatures would be high enough such that a negative ignition offset is applied on the first few runs. As for just removing the front CAT's - it should be incredibly close to an X Pipe because when we have seen secondary CAT's removed there is hardly any gain at all. The difference between a tune for Turner Pipes and X Pipe is not really going to be that different. Not different enough that you will feel a difference and given the ECU is mostly target the changes made would need to be very large to actually take effect. |
|
Appreciate
0
|
06-28-2011, 05:51 PM | #38 | |
Private First Class
10
Rep 133
Posts |
Time for me to go put some 100 octane in baby!!!!
Quote:
|
|
Appreciate
0
|
06-28-2011, 10:43 PM | #39 | |
Colonel
471
Rep 2,991
Posts |
Quote:
I'm glad I bought software from Evolve just because they are so willing to support the boards like this. |
|
Appreciate
0
|
06-28-2011, 10:50 PM | #40 |
10720
Rep 27,536
Posts |
wow awesome post, some very interesting data there. Thanks for posting
__________________
BEFORE YOU BUY YOUR NEXT BMW, EMAIL OUR GUY KOTE FIRST! Kote M Sales:Kotem@bmwofcamarillo.com Cell:805-368-9101 vipfinance@bmwofcamarillo.com for warranties! |
Appreciate
0
|
06-29-2011, 12:41 AM | #41 |
435
Rep 2,373
Posts |
we are not sure ... i think he had stock exhaust with test pipes ... he was trying to load stock file in ECU but decide not to ...
|
Appreciate
0
|
06-29-2011, 12:45 AM | #42 |
435
Rep 2,373
Posts |
|
Appreciate
0
|
06-29-2011, 12:54 AM | #43 | |
435
Rep 2,373
Posts |
Quote:
I guess we both will have to hurry to brake new cars in |
|
Appreciate
0
|
Post Reply |
Bookmarks |
Thread Tools | Search this Thread |
|
|