[Shadowbelmi]

Hi, I have a concern with my car that has been an issue that I don’t know what the cause is. My tune is stage 2+ e30 with all supporting mods (7.5 inch vrsf fmic and arm catless downpipes) I have brand new boost solenoids, along with all new vacuum lines. Walnut blast was just completed as well and vanos solenoids.


It is a 2009 335xi e90 n54

With all of this my car feels faster but not as fast as advertised. I see that a lot of people achieve 350whp+ with less mods but my car is not doing this. While I know virtual dyno are inaccurate but a lot of people have used them and gotten better numbers. According to this log I’m only achieving 315 whp and 370 torque. The numbers are worse on other maps, this is the best so far.

Even on 91 tune I was getting timing corrections running 2.5 gallons e85 and the rest 91 premium.

I have attempted to change a bunch of things including fueling and stage 2+ versions but the results are very similar every time.

Is there anything wrong with this log and also what could be the cause of my car underperforming.


(P.S: my fueling in this one was 8 gallons e85 from maverick/Kum and Go and 4 gallons 91 with 20% on the tank left)


I'm new here so plz no hate

[Shadowbelmi]

https://datazap.me/u/charbelmi/mhd-s...og=0&data=3-23

Link to the data log

[335i54n]

youre not reaching boost target and have really high wgdc (do you have wg rattle?). look for leaks and try adjusting the wg arms

[Shadowbelmi]

Originally Posted by 335i54n

youre not reaching boost target and have really high wgdc (do you have wg rattle?). look for leaks and try adjusting the wg arms

Yeah my car used to overboost on the other tunes in mhd like stage 1, which is why I changed out a bunch of the parts with boost. Maybe one of the vacuum lines is not in all the way. I will check again. My car doesn't have wg rattle when driving, I've heard it a few times when I start the car but it doesn't really bother me. I did have all the gasket changed on my intake manifold and chargepipe o ring when the walnut blast was completed but none of the parts were OEM. The o ring was boost monkey off amazon, and the intake manifold gaskets brand was URO parts, both of which had good reviews. I noticed that the chargepipe is not sitting flush with the throttle body, would a vacuum leak cause underboosting issues?

[SlowE92]

Originally Posted by Shadowbelmi

Yeah my car used to overboost on the other tunes in mhd like stage 1, which is why I changed out a bunch of the parts with boost. Maybe one of the vacuum lines is not in all the way. I will check again. My car doesn't have wg rattle when driving, I've heard it a few times when I start the car but it doesn't really bother me. I did have all the gasket changed on my intake manifold and chargepipe o ring when the walnut blast was completed but none of the parts were OEM. The o ring was boost monkey off amazon, and the intake manifold gaskets brand was URO parts, both of which had good reviews. I noticed that the chargepipe is not sitting flush with the throttle body, would a vacuum leak cause underboosting issues?

The weird thing is your boost oscilates while youre WOT. Are you doing pulls with DSC off? It could be a leak, or a boost solenoid. Your fuel trims look normal so you can rule out a fueling issue.

[Shadowbelmi]

Originally Posted by SlowE92

The weird thing is your boost oscilates while youre WOT. Are you doing pulls with DSC off? It could be a leak, or a boost solenoid. Your fuel trims look normal so you can rule out a fueling issue.

DSC is fully off, interesting enough when I switch back to the 91 map, it hits proper boost. Either way getting a boost leak/smoke test done today to find any leak. My car has always been weird with ethanol but the LPFP doesn't really look like its dipping too badly.

[SlowE92]

Originally Posted by Shadowbelmi

DSC is fully off, interesting enough when I switch back to the 91 map, it hits proper boost. Either way getting a boost leak/smoke test done today to find any leak. My car has always been weird with ethanol but the LPFP doesn't really look like its dipping too badly.

Looked at your log again and your boost dips with your cylinder timing corrections, specifically cylinder 5. Have you replaced/moved the coil/injector, or changed the spark plugs lately? Youre detecting knock and youre pulling timing to avoid damage. Are you on an upgraded fuel pump?

[Shadowbelmi]

Originally Posted by SlowE92

Looked at your log again and your boost dips with your cylinder timing corrections, specifically cylinder 5. Have you replaced/moved the coil/injector, or changed the spark plugs lately? Youre detecting knock and youre pulling timing to avoid damage. Are you on an upgraded fuel pump?

Plugs and Coils were done roughly 6k miles ago, smoke test revealed a massive leak on rear inlet. I have been obsessed with trying to find out why my car pulls timing, I thought I fixed it by adding 2 gals of e85 but there was still some slight timing adjustments happening in other logs. I'm convinced its either the plugs or my injectors but it's never misfired which is why I'm confused. The plugs are I believe are Iridium but not 2 step colder, I believe they are OEM replacements. Coils are eldor. Stock Fuel pump from my understanding.

It pulls timing on 91 tune as well which is very infuriating. Never more than a few degrees.

[konstat]

Originally Posted by Shadowbelmi

Plugs and Coils were done roughly 6k miles ago, smoke test revealed a massive leak on rear inlet. I have been obsessed with trying to find out why my car pulls timing, I thought I fixed it by adding 2 gals of e85 but there was still some slight timing adjustments happening in other logs. I'm convinced its either the plugs or my injectors but it's never misfired which is why I'm confused. The plugs are I believe are Iridium but not 2 step colder, I believe they are OEM replacements. Coils are eldor. Stock Fuel pump from my understanding.

It pulls timing on 91 tune as well which is very infuriating. Never more than a few degrees.

In my experience the MHD OTS maps either run aggressive timing or we both have junk gas in our areas. To curb the timing issues I was having on the Stage 2+, 91 octane map I need to run at least E25. I run E30 for extra octane in case things get squirly in the combustion chamber. With that said I wouldn’t be surprised if you need more then E30 to run the E30 OTS map without timing corrections. Probably something like E45 to E50.

Are you able to put in 93 octane along with the E85? You should also confirm your ethanol percentage every time you add fuel with an E85 calculator available on apple or android app stores and then you also want to test the ethanol at the pump. Testers are about $10 on Amazon. Depending on the season it can vary from E51 to E83 per ASTM D5798, where you’ll want to put the actual pump ethanol content in the calculator.

If my gas tank is close to empty, for me to achieve E30 for example, I need to put around 2 gallons of pump gas per each gallon of “E85”, which tested at E70 the other day at the station I use.

[Shadowbelmi]

Originally Posted by konstat

In my experience the MHD OTS maps either run aggressive timing or we both have junk gas in our areas. To curb the timing issues I was having on the Stage 2+, 91 octane map I need to run at least E25. I run E30 for extra octane in case things get squirly in the combustion chamber. With that said I wouldn’t be surprised if you need more then E30 to run the E30 OTS map without timing corrections. Probably something like E45 to E50.

Are you able to put in 93 octane along with the E85? You should also confirm your ethanol percentage every time you add fuel with an E85 calculator available on apple or android app stores and then you also want to test the ethanol at the pump. Testers are about $10 on Amazon. Depending on the season it can vary from E51 to E83 per ASTM D5798, where you’ll want to put the actual pump ethanol content in the calculator.

If my gas tank is close to empty, for me to achieve E30 for example, I need to put around 2 gallons of pump gas per each gallon of “E85”, which tested at E70 the other day at the station I use.

I only have 91 and e-85 in my area. I have been told by many reputable shops and people that the Ethanol from the station I go to is e70. With this in mind I attempted to go with a calculator and used the amount specified for a station that has e70. I receive non stop timing corrections after letting the car mix the fuel for half an hour. After I was like let me try to add a lot more e-85 so I added what would have been closer to e50, and the timing corrections were way better but my boost wasn't holding at all for some reason. When I map switch to 91 and re log, the boost overshoots by a little but at least it's hitting boost now. Even though my fuel trims don't look bad, the timing corrections make the car unbearably slow. Of course I stayed on the e map until I refilled with just premium and then I switched back to the 91 map.

Getting new inlets in soon and having them installed, wish I knew about this leak when they were doing the downpipes 2 weeks ago. Hopefully everything resolves it self with the inlets. I am also in colorado, so maybe altitude is playing a part


I'm also going to try 2 step colder plugs to see if that resolves the issue.

[Shadowbelmi]

Correction:


The spark plugs that are used are already 2 step colder plugs, I misread the description. They are the NGK 97506.

[konstat]

Originally Posted by Shadowbelmi

I only have 91 and e-85 in my area. I have been told by many reputable shops and people that the Ethanol from the station I go to is e70. With this in mind I attempted to go with a calculator and used the amount specified for a station that has e70. I receive non stop timing corrections after letting the car mix the fuel for half an hour. After I was like let me try to add a lot more e-85 so I added what would have been closer to e50, and the timing corrections were way better but my boost wasn't holding at all for some reason. When I map switch to 91 and re log, the boost overshoots by a little but at least it's hitting boost now. Even though my fuel trims don't look bad, the timing corrections make the car unbearably slow. Of course I stayed on the e map until I refilled with just premium and then I switched back to the 91 map.

Getting new inlets in soon and having them installed, wish I knew about this leak when they were doing the downpipes 2 weeks ago. Hopefully everything resolves it self with the inlets. I am also in colorado, so maybe altitude is playing a part


I'm also going to try 2 step colder plugs to see if that resolves the issue.

Typically the stock LPFP can only handle E40 so keep an eye on the low pressure.

I would still run E30 on the Stage2+, 91 octane map. I have to at least. My quarter mile time correlates roughly to 400whp (haven’t dynoed yet). I also do think the altitude is playing a role as another person on forums had a similar low power issue with 17ts. I’d say based on altitude alone you need a custom tune.

If you’re not getting misfires under heavy load I wouldn’t go with the 2 steps. Those are meant for 600+ whp. Ken at Wedge Performance who created these OTS maps advised against 2 step colders unless pushing big power.

Send another log when you get those inlets fixed up.