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Old 11-10-2013, 12:59 AM   #901
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buying a used HPF M3

Quote:
Originally Posted by Twin_Turbo_S54 View Post
Good luck with the conversion. I wish you would stick to SMG, work on it, and come with a solution for the E46 platform.
I am still looking at possibly changing the torque value that the DME sees for shifting and experiment a bit before I make the swap. There is another fellow I have been speaking with that knows the DME really well that I have tossed some ideas around to see what could work... If I had my preference I would stick with SMG as I think it's the best solution in a high horsepower car with revs that climb so fast...


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Old 11-11-2013, 02:09 PM   #902
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Spent the morning tuning for my open dump exhaust... The car ran much leaner and needed lots of more fule up-top which tells me I making lots more power. In fact where peak power was made and where the power dropped off at with the old exhaust is where I needed to add the fuel. So my hp curve should not drop off as it did previously. The car in low boost is scary... Haven't even tried to use the 50/50 yet... From what my butt dyno says I am over 700+ rwhp on pump and pulls harder than my meth did with the old exhaust and it made 722 / 652... 5th gear pulls to red line quick and uses less of the road than 4th did with my old exhaust. The reason the reduced back pressure and the scavenging the cylinders of spent exhaust allowing for more fuel to be burnt hence more power. So it's much more efficient especially at the boost levels I run. Needed to get the base tune done before I used 50/50 anyway so I might build up the courage before the end of the day to run 50/50 and tune it ....


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Old 11-13-2013, 01:11 AM   #903
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A few pics of the cutout being welded in

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Old 11-13-2013, 03:46 AM   #904
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Re: buying a used HPF M3

Looking good!

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Old 11-13-2013, 10:08 PM   #905
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Well my Walbro 400 e85 pump packed it in... 20psi of fuel rising and falling 10psi at idle... I noticed the other day the gauge was fluctuating and then progressively got worse very quickly.


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Old 11-14-2013, 11:51 PM   #906
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Quote:
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Well my Walbro 400 e85 pump packed it in... 20psi of fuel rising and falling 10psi at idle... I noticed the other day the gauge was fluctuating and then progressively got worse very quickly.


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My gas gauge was miss reading so I was out of gas... lol


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Old 11-14-2013, 11:57 PM   #907
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Cut out positioned at rear of car.

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Old 11-15-2013, 12:02 PM   #908
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That's a different position.

On my own project, I plan to put one pre-cat.
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Old 11-16-2013, 12:49 AM   #909
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Quote:
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That's a different position.

On my own project, I plan to put one pre-cat.
I originally was going to have it in section one. I decided that the noise and vibration as well as having to rework 02 sensor location not worth it. I decided that a straight 3 inch pipe all the way with almost a straight shot to the dump exiting at the rear the best. The muffler has to take the more restrictive path. I can actually run the dump open as it angles down and back far enough not to put that much sound into the cabin. The power would be about the same IMO as well. I may add the waste gate dump if I think its necessary. I am very happy with how it turned out. Still have to dial in the tune a bit more... Should have that done this weekend.


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Old 11-25-2013, 06:31 PM   #910
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Had my 02 sensor fail today.... It started to idle funny and I noticed my AFRs were showing lean even though I have 02 FB off in boost and made no changes. Swapped it out and it was back to normal.


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Old 11-25-2013, 06:33 PM   #911
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Custom Southbend clutch good for 740 wheel torque arrived today with pressure plate
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Old 11-25-2013, 06:39 PM   #912
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Dialled in the tune today and am ready for the dyno tomorrow afternoon so we will see what the final numbers r... Seems that 3rd gear wont hook on pump so that's a good sign.... Ill post the graphs for those interested


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Old 11-26-2013, 07:50 PM   #913
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Well had a good afternoon at the dyno..... The real surprise was pump gas tune with rear wheel torque below the curve.. Made a 125 foot pound gain around 4200 rpm over previous exhaust. 600 total rear torque. Very fun to drive best it has ver run since owning it...

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Old 11-26-2013, 07:54 PM   #914
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Pump 654 rear horsepower comparison old exhaust at 630. Power under the peak was the most impressive and very noticeable in driving. Gaining over 100 horsepower in some areas. The car is lot a different and pulls from low rpm amazingly torque reminds me of a big block


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Old 11-26-2013, 08:01 PM   #915
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Now for the 50/50 numbers. Not as impressive gains 742 verses 721 but still in some areas a 50 hose power gains was made. I was very happy with the torque number from 652 to 685. So a decent gain. Some areas had 60 foot lbs gains

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Torque comparison with cutout

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Old 11-26-2013, 08:25 PM   #916
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Horsepower comparison 50/50 with exhaust cutout verses old exhaust. 30 to 50 hp gain throughout. Theses runs were after 3 hours of dyno time so some heat soak for sure...

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Old 11-26-2013, 09:43 PM   #917
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My observation thus far is the car doesn't seem to be a high rpm big horsepower car as others. The real power of this car for some reason is in the lower rpm and the vast amount of torque it makes. I spent a lot of time dialling in the tune / boost as best I can in the low to mid range which translates into some nice numbers and a blast to drive. It literally plants u in ur seat and keeps u there. I must admit I have not messed a lot with timing and boost levels to make more topend. Maybe that will be a focus when I get my new head finished being ported and cams as well as tune for race gas. For now the car is going into the garage for the winter for some planned surgery. Stay tuned


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Old 11-28-2013, 10:55 AM   #918
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Impressive numbers A! Great job!

PLEASE dyno it on a DynoJet somewhere in your area ... we'll be seeing some considerable differences...
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Old 11-29-2013, 01:25 AM   #919
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On further review I looked at my logs from the dyno runs... After 6500 the AIT rose an additional 14+ C reducing timing by 2.5+ degrees which would account some of the power drop up top. The most AIT I see from road tuning is 14c to 29c max and the dyno was over 43c. I was also in 5th gear for all the runs which builds heat fast. This was done as 4th gear traction issues with all the torque. Also I was not removing fuel above 6500 rpm to compensate for water / meth so my AFRs were 11 and should have been 11.5 to 11.8. So I'm leaving power in the table up top. I was playing it safe initially up top but ran out of dyno time. I will be adding an open waste gate dump to free up a few extra ponies. Coolant temps were between 74C and 79C and the max was 83C toward the end of the day which is good.

So I guess its back to the dyno... We only have 1 dyno that's reasonable to get to within a days drive and its 2 hours away and no dyno jets... It would be nice to see what it does with the changes... I'd like to get it on a dyno jet one of these days.


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Old 01-14-2014, 11:15 AM   #920
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Well I added a 4 inch exhaust and open dump for kicks. ...

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It's loud.... Sounds like a new machine.... very angry .. So much for being a sleeper

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