[Malaka1]

2007 BMW 335I 6MT
-265's General Exclaim UHP in the rear..
-Temperature outside was about 65 F
-Shifting around 6000-6200k rpm
-Slipping the clutch from 3200k rpm launch
-approx. 2 gallons of 93 octane and 4 gallons of 110 leaded.
-clutch toast after last run

Best Time/Trap
1.987 60ft
ET 12.369 @ 116.897mph

A bad launch
2.289 60ft
ET 12.889 @ 115.772

Very bad launch, lol
2.484 60ft
ET 13.610 @ 111.092


I only got four runs in, and the car felt like it was getting faster after every run...either it was adapting to the race gas or I started driving better... The last run I made though the clutch was toast! You could smell it for about 30 min. Either from slipping the clutch too much or it just can't take the increase in power over time. I only have 23,000 miles on the factory clutch though, so for it to be dying this soon is strange. I could feel it slipping in all the runs when I slammed the 3-4 shift. I think that if I had another 4-5 runs with a clutch that was grabbing it would have started trapping 118mph+

[ianthegreat]

I ran about 3 gallons of straight 110 leaded and my car felt pretty damn fast too.

[jpsimon]

just curious, since I'm not a 1/4 mile guy, but isn't the "sweet spot" right around 6500-6600rpm for shifting? All my fastest datalogged times have been when shifting up there. 6000 seems pretty low, especially when you're running race gas with no boost taper up towards redline. Did you do any datalogs?

[Malaka1]

Originally Posted by jpsimon

just curious, since I'm not a 1/4 mile guy, but isn't the "sweet spot" right around 6500-6600rpm for shifting? All my fastest datalogged times have been when shifting up there. 6000 seems pretty low, especially when you're running race gas with no boost taper up towards redline. Did you do any datalogs?

I did datalog some runs but I think everytime I did one it would overwrite the last one saved, so I have one datalog...and it is the last run I made where my clutch started to slip like crazy!

[OpenFlash]

Good work.. Just an FYI, there is no adapting necessary with v4 when running race gas. In your 3 runs, your traps went from 112mph to 116mph to 117mph. That's all from better driving and nothing else With some more practice, you have a 118-119run in there. Probably even with your clutch slipping.

And the 6000-6200rpm shifting suggestion was just for 3rd to 4th. You definitely want to run 1st and 2nd gear out to 6500rpm. Or else you'll be down some torque at the upshift.

Shiv

PS. Email me your datalog file and I can host/post them for you.

[JayKay335i]

You've got everything you need for good numbers.

Now just keep practicing and get that 60' down.

[Malaka1]

Originally Posted by shiv@vishnu

Good work.. Just an FYI, there is no adapting necessary with v4 when running race gas. In your 3 runs, your traps went from 112mph to 116mph to 117mph. That's all from better driving and nothing else With some more practice, you have a 118-119run in there. Probably even with your clutch slipping.

And the 6000-6200rpm shifting suggestion was just for 3rd to 4th. You definitely want to run 1st and 2nd gear out to 6500rpm. Or else you'll be down some torque at the upshift.

Shiv

Ok, I would shift a little early 6000-6200rpm from 1st to 2nd due to wheelspin once the clutch was fully depressed.. I will definately shift higher next time 2nd-3rd gear.

Next time I will have new tires, Forge DV, Evolution Racewerks Chargepipe, and a new clutch..so hopefully I will see some better trap speeds..

[OpenFlash]

Originally Posted by Malaka1

Ok, I would shift a little early 6000-6200rpm from 1st to 2nd due to wheelspin once the clutch was fully depressed..

Next time I will have new tires, Forge DV, Evolution Racewerks Chargepipe, and a new clutch..

And a stg 4+ that actually runs full boost

[Malaka1]

Originally Posted by shiv@vishnu

And a stg 4+ that actually runs full boost

Thats right, I forgot about that. An extra 1psi of boost will be nice!

[DuffySpeed]

Originally Posted by Malaka1

2007 BMW 335I 6MT
-265's General Exclaim UHP in the rear..
-Temperature outside was about 65 F
-Shifting around 6000-6200k rpm
-Slipping the clutch from 3200k rpm launch
-approx. 2 gallons of 93 octane and 4 gallons of 110 leaded.
-clutch toast after last run

Best Time/Trap
1.987 60ft
ET 12.369 @ 116.897mph

A bad launch
2.289 60ft
ET 12.889 @ 115.772

Very bad launch, lol
2.484 60ft
ET 13.610 @ 111.092

Congrats on the runs but do the times especially the MPH seem pretty disappointing to anyone else? I expected to see 124mph traps for a Stage4+ on race gas. At 116mph traps you are down around 80hp from my expectation. Are there any other Stage4+ race gas times to compare these with?

[Malaka1]

Originally Posted by DuffySpeed

Congrats on the runs but do the times especially the MPH seem pretty disappointing to anyone else? I expected to see 124mph traps for a Stage4+ on race gas. At 116mph traps you are down around 80hp from my expectation. Are there any other Stage4+ race gas times to compare these with?

Well, my best trap was closer to 117mph.. And it was my second time out in this car, so I need some practice. I also had a clutch that started to slip during shifts so that could have dropped my mph by a little. Also I had 2 gallons of pump gas mixed with 4 gallons of 110 leaded, half a gallon or less of pump gas mixed with some ms109 unleaded would be optimal. And the Stage 4+ maps will be producing another 1psi of boost today/tommorow, which should be good for another 20-25 hp...another 1-2mph possibly.

With some good driving, and all of the above things mentioned it should go 120+mph...

[DuffySpeed]

Originally Posted by Malaka1

Well, my best trap was closer to 117mph.. And it was my second time out in this car, so I need some practice. I also had a clutch that started to slip during shifts so that could have dropped my mph by a little. Also I had 2 gallons of pump gas mixed with 4 gallons of 110 leaded, half a gallon or less of pump gas mixed with some ms109 unleaded would be optimal.

I just read another thread and my expectation for what it should run may be unrealistic. I saw a GIAC Stage2+ went 116-117mph also. Maybe 117mph is just what they run at this power level.

[Big Tom]

To be honest; not impressive.

[Malaka1]

I really think the slipping clutch ruined any chance of great ET's or trap speeds.. I mean there was a huge delay between shifts... I would slam 4th gear wait, wait then grab and wait for boost to come back up and then go. Those 3-4 gear changes usually take .3 seconds with a 6mt but I would guess that with the slipping clutch around .6 seconds or more...I can check this later with the datalog.

[badass1g]

Also buy my MT setup with my 16lb kosei wheels and you will run a 11.7ish if i would decide to sell them that is (probably wont). But you seriously need some better tires for drag racing.

[Malaka1]

Originally Posted by badass1g

Also buy my MT setup with my 16lb kosei wheels and you will run a 11.7ish if i would decide to sell them that is (probably wont). But you seriously need some better tires for drag racing.

Radials will definately help a lot! But I want to see how fast I can go on street tires first..

[GeorgiaTech335coupe]

Originally Posted by Malaka1

I really think the slipping clutch ruined any chance of great ET's or trap speeds.. I mean there was a huge delay between shifts... I would slam 4th gear wait, wait then grab and wait for boost to come back up and then go. Those 3-4 gear changes usually take .3 seconds with a 6mt but I would guess that with the slipping clutch around .6 seconds or more...I can check this later with the datalog.

Your ET (12.36) looks slow for your mph trapped (~117) and 60' (1.98). I had an ET of 12.45 and only trapped 112 with a 60' not too much better, so I'd say either you were losing traction during the run and/or clutch slippage. PS your clutch can go out with >25k miles, I had mine replaced at 21k. I do a lot of drag racing.

[oddjob2021]

malaka1, thanks for the honest result, you could have easily skewed the results so that you never had a bad run. and drag racing is fun but not really where the procede outshines the other tunes. on a road course or auto-x, the partial throttle control and logic is what bests the competitor's product.

as for the clutch, I can suggest ASR's. They have 5 stages to choose from with and without a lightweight fly, the 4th and 5th stage are for drag racing only, I dont know how hardcore of a fan you are.

[ridin135]

Dang kinda of dissapointed I was expecting to see 120+ traps, but then again this is still beta. Eh whatever its still fun as hell to drive.

[kjrulz]

I'm glad you had fun. Sorry about your clutch. Those times can definitely be better with your supporting mods.

Tires > clutch > 6500 rpm > reaction time.

[jpsimon]

Originally Posted by ridin135

Dang kinda of dissapointed I was expecting to see 120+ traps, but then again this is still beta. Eh whatever its still fun as hell to drive.

eh, i'd blame it more on the clutch+shift points. When more people start getting to the track we'll see much faster times, fear not.

[OpenFlash]

Originally Posted by ridin135

Dang kinda of dissapointed I was expecting to see 120+ traps, but then again this is still beta. Eh whatever its still fun as hell to drive.

You really expected him to pull a 120mph trap with a slipping clutch and 2 practice runs? Give him some practice and he'll get it. I'm still surprised he managed to pull a sub 2s 60' time on Generals. Launching has never been my strong suit

shiv