[Coupes33]

I took the car out to the Test N Tune last night, had 4 runs with the best a 11.056s @ 129.77mph. Conditions were ideal with temperatures dropping from 21C to 12C during the night. Surprisingly, there wasn't a great number of cars that turned up. There was a couple of M140s pulling mid 12s but they were out gunned by 5 Audi S3s which were pulling times between 11.3s - 12.0s. This time of mine is the best I have ever achieved in any car down the strip which is good but to be so close to a 10s is frustrating. Looking at the datalog for the run, I believe there is still improvements that can be made. I have an issue with oscillations in the boost and wastegate readings which need investigation. There are still some timing corrections also.

https://datazap.me/u/coupes44/datalo...0&tmax=1974.72

[MJ80.]

Thats fantastic mate.

[e36mmm]

Awesome for a 335i mate. Consider it a 10 second pass once you have made a few adjustments. Congrats

[DR-JEKL]

Nice work hopefully with some more dialling in tweaking and practice you'll break into the 10's huh

[Socket]

Go Coupes !!!!!

[Coupes33]

Thanks fellows for your comments. Working out what is causing the fluctuations in the boost and wastegate readings is the first issue that I need to solve. The wastegate readings on Bank 1 have very large fluctuations so to start with, I will log Bank 2 and see if it is the same. If I can solve this issue and get a smooth boost curve that maybe enough to get into the 10s.

[DR-JEKL]

What's Dimitri saying to resolve it (BURAQ is your tuner right?)

[Coupes33]

Originally Posted by DR-JEKL

What's Dimitri saying to resolve it (BURAQ is your tuner right?)

He is of the belief that it could be the rear silicone VTT inlet collapsing. As the oscillations are from a low rpm and consistent throughout the rev range, I was thinking more like a wastegate oscillating. I am going to check out, the best I can, the wastegate actuators and vacuum hosing. With the RB outlets and shield installed, there is next to no opening to get to the front turbo but I will see if I can find anything.

[JB4-335]

Originally Posted by Coupes33

He is of the belief that it could be the rear silicone VTT inlet collapsing. As the oscillations are from a low rpm and consistent throughout the rev range, I was thinking more like a wastegate oscillating. I am going to check out, the best I can, the wastegate actuators and vacuum hosing. With the RB outlets and shield installed, there is next to no opening to get to the front turbo but I will see if I can find anything.

Nice ET mate.

That's a possibility. One of mine had collapsed before it was installed.

Looking at the log it does seem hardware related. If you could clean that boost up you would definitely run a high 10 second pass. Cylinder 5 and 1 are taking a slight hit too. I recall my cylinder 5 was always the unhappy one. More meth cleaned that up though for me.

What's your fuelling setup?

[Coupes33]

Originally Posted by JB4-335

Nice ET mate.

That's a possibility. One of mine had collapsed before it was installed.

Looking at the log it does seem hardware related. If you could clean that boost up you would definitely run a high 10 second pass. Cylinder 5 and 1 are taking a slight hit too. I recall my cylinder 5 was always the unhappy one. More meth cleaned that up though for me.

What's your fuelling setup?

Thanks mate. My thoughts are that there is something continually opening and closing. Whether it could be a wastegate or a DV, I need to investigate. I agree that a fix to this issue will improve my chances of a 10s run. Fuelling - Fuel-it Stage 3 LPFP, original OEM HPFP, Fuel-it PI and 100% E85.

[tawfeeqh]

Great time Coupes, such a shame you missed out on the 10 by such a small margin. hopefully next time you go out you get the 10

[Coupes33]

Originally Posted by tawfeeqh

Great time Coupes, such a shame you missed out on the 10 by such a small margin. hopefully next time you go out you get the 10

Thanks I am trying to get there.

[Rob@RBTurbo]

Strong results sir ESPECIALLY for "ONLY" 23-25psi. We see some competitors "Largest" hybrids in this ET/Trap zone running 28-32psi.

On the email you'd sent we suggested checking out the wastegate solenoids (and supporting vacuum actuation system)- but wow if the inlets looks anything like those pictured above we'd recommend replacing it ASAP (restrictions like that we'd imagine could snap turbo shafts, etc and at minimum significantly effect performance). We've always stated that fitting a 2" hose through that crunch zone is a bad idea- but the masses mostly discarded it. The RB Silicone Inlets are tapered down to 1.75" just before the crunch zone where they remain until the turbo connection, which allows for a much nicer fitment.

Rob

[Coupes33]

Originally Posted by Rob@RBTurbo

Strong results sir ESPECIALLY for "ONLY" 23-25psi. We see some competitors "Largest" hybrids in this ET/Trap zone running 28-32psi.

On the email you'd sent we suggested checking out the wastegate solenoids (and supporting vacuum actuation system)- but wow if the inlets looks anything like those pictured above we'd recommend replacing it ASAP (restrictions like that we'd imagine could snap turbo shafts, etc and at minimum significantly effect performance). We've always stated that fitting a 2" hose through that crunch zone is a bad idea- but the masses mostly discarded it. The RB Silicone Inlets are tapered down to 1.75" just before the crunch zone where they remain until the turbo connection, which allows for a much nicer fitment.

Rob

Thanks Rob. I will start looking into the cause of the oscillating boost today. The wastegate solenoids were changed not long ago but one could have failed. Hopefully, a 10s run next time. My time is not as impressive as Duck's 9.85s @ 140mph that he achieved on Saturday night.

[waterbottle1]

awsome results

[JB4-335]

Originally Posted by Coupes33

Hopefully, a 10s run next time. My time is not as impressive as Duck's 9.85s @ 140mph that he achieved on Saturday night.

Whooh!!!!! That's moving. Just saw that one the other forum.

[101Duck]

haha thanks coupes.


Yeah on paper it sounds like it was moving, in the car it still felt slower than it normally does. haha. Never happy, I think I've torched the convertor sadly so it's not grabbing like it's meant to. Hence it feeling slow in the mid range. Boost was also not set on kill mode and i left the line at 15psi, it's gotten out of the hole without spinning on 25psi before. So my 1.51 60ft coulda been deep in the 1.4's. 1 tenth in the 60 is 2 at the deep end. So without any major changes (converter, leave the line a bit harder and up the boost/steady the timing) I reckon it's got a 9.3 to 9.4 in it.


Part of me wants to do all that and take it to warwick and see if it can send it there. Another part of me wants to go all out and make the motor less stock, go standalone ecu and do a 4link 9" rear end, cage chute, seats tech setup and then it'll get on down the track at some pace.


Maybe a compromise? head work, boost, stand alone and go send it somewhere else? maybe a trip to WSID to see if it can get down into the low 9s before I go "cheating" as the yanks would say.

[Rob@RBTurbo]

Originally Posted by 101Duck

haha thanks coupes.


Yeah on paper it sounds like it was moving, in the car it still felt slower than it normally does. haha. Never happy, I think I've torched the convertor sadly so it's not grabbing like it's meant to. Hence it feeling slow in the mid range. Boost was also not set on kill mode and i left the line at 15psi, it's gotten out of the hole without spinning on 25psi before. So my 1.51 60ft coulda been deep in the 1.4's. 1 tenth in the 60 is 2 at the deep end. So without any major changes (converter, leave the line a bit harder and up the boost/steady the timing) I reckon it's got a 9.3 to 9.4 in it.


Part of me wants to do all that and take it to warwick and see if it can send it there. Another part of me wants to go all out and make the motor less stock, go standalone ecu and do a 4link 9" rear end, cage chute, seats tech setup and then it'll get on down the track at some pace.


Maybe a compromise? head work, boost, stand alone and go send it somewhere else? maybe a trip to WSID to see if it can get down into the low 9s before I go "cheating" as the yanks would say.

Congrats on the 9's pass man. Great work for the advancement of the platform into the single digits.

As for the yanks believing it is "cheating" not sure if that is the case, it is however doing something rather substantial to the drivetrain that not your average enthusiast would be open arms about doing to their vehicle. Thanks to you however it is a very well proven and effective drivetrain modification, so something to consider if one wants to skip over all of the AT drivetrain BS/waiting for an otherwise solid bolt-in/DME integrated solution.

It also would be very interesting to see/discuss how a "basic" setup like coupes were to perform with adding in the powerglide and suspension setup, just as it would be interesting to see/discuss what would happen to Ducks setup if we were to go back to a drivetrain setup similar to Coupes. There is likely going to be a dramatic swing in both scenarios and as such if at anything it is not cheating but rather a means to an end for the drag racers of the world.

Rob

[Coupes33]

Originally Posted by 101Duck

haha thanks coupes.


Yeah on paper it sounds like it was moving, in the car it still felt slower than it normally does. haha. Never happy, I think I've torched the convertor sadly so it's not grabbing like it's meant to. Hence it feeling slow in the mid range. Boost was also not set on kill mode and i left the line at 15psi, it's gotten out of the hole without spinning on 25psi before. So my 1.51 60ft coulda been deep in the 1.4's. 1 tenth in the 60 is 2 at the deep end. So without any major changes (converter, leave the line a bit harder and up the boost/steady the timing) I reckon it's got a 9.3 to 9.4 in it.


Part of me wants to do all that and take it to warwick and see if it can send it there. Another part of me wants to go all out and make the motor less stock, go standalone ecu and do a 4link 9" rear end, cage chute, seats tech setup and then it'll get on down the track at some pace.


Maybe a compromise? head work, boost, stand alone and go send it somewhere else? maybe a trip to WSID to see if it can get down into the low 9s before I go "cheating" as the yanks would say.

It is good to hear that there is still more left in it Duck. A slipping TC certainly wouldn't help in getting a better time. What power is your engine putting out since the rebuild? Your 60' time (1.51s) is still pretty good. My mates Mustang was lifting the front wheels with a 1.49s 60'. You should keep it registered and get a roll cage installed. I have seen quite a few street registered muscle cars at the drags with neat roll cages installed. You need to update the Dragtimes database with this result.

[Coupes33]

Originally Posted by Rob@RBTurbo

Congrats on the 9's pass man. Great work for the advancement of the platform into the single digits.

As for the yanks believing it is "cheating" not sure if that is the case, it is however doing something rather substantial to the drivetrain that not your average enthusiast would be open arms about doing to their vehicle. Thanks to you however it is a very well proven and effective drivetrain modification, so something to consider if one wants to skip over all of the AT drivetrain BS/waiting for an otherwise solid bolt-in/DME integrated solution.

It also would be very interesting to see/discuss how a "basic" setup like coupes were to perform with adding in the powerglide and suspension setup, just as it would be interesting to see/discuss what would happen to Ducks setup if we were to go back to a drivetrain setup similar to Coupes. There is likely going to be a dramatic swing in both scenarios and as such if at anything it is not cheating but rather a means to an end for the drag racers of the world.

Rob

The ZF auto transmission is a major issue in getting low times down the strip. A 4L80E or powerglide with a 3,500rpm stall TC would get my car into the mid 10s very easily IMO. Putting an upgraded ZF into Ducks would probably bring his times back to mid 10s if the transmission held together and if you could get it to launch somehow.

[mikenazz]

Wow so close to 10s !

How did you launch, thats a good 60ft.

[Rob@RBTurbo]

Originally Posted by Coupes33

The ZF auto transmission is a major issue in getting low times down the strip. A 4L80E or powerglide with a 3,500rpm stall TC would get my car into the mid 10s very easily IMO. Putting an upgraded ZF into Ducks would probably bring his times back to mid 10s if the transmission held together and if you could get it to launch somehow.

Agreed but based on what we have seen in the states a solid ST setup has very much difficulty running low 11's on the ZF auto- let alone 9's. All said we'd say Ducks setup on your drivetrain would run probably 11.0-12.0sec ET's. What is the larger mystery is what your setup would do on Ducks drivetrain (we do not think it would be 9's, rather easy low-mid 10's).

Rob