[mm5300]

I was trying to find the answers to my questions in the forum, but since I had a few different ones, I was getting a headache searching through them all. Didn't help that all the terms are pretty generic and returned a lot of results.

I just started going to drag strip near me and seeing what I can run. Been trying to learn the car to get the best time. It's a stock '18 Comp and out of about 6 runs, the best is a 11.2. I was looking for some recommendations on some tweaks to make to get it down a bit. I forgot to charge my dragy, so it was off the track times. It was with the OEM Pirellis and with almost a full tank of gas using LC. I know, I wasn't thinking at the time and didn't plan well Here's what I was wondering:

1. I saw that Shell premium gas seems to be recommended. Is there a max octane number to stay under to make sure you don't do any damage? If you can go over the regular pump gas, do you mix with race fuel or use some type of additive?

2. I know the M5 4WD is something like 60/40 to the rear, so does it make sense to put drag radials or something more sticky on just the rear, or across all 4? I've seen people mention 20' and 19'. What size(s) have people had success with?

3. What drag radials have people had success with? Seems like most people recommend the MT ET or R888R?

Sorry for all the questions, but just trying to see what people have had luck with and see what I can get it to do. Thanks and any suggestions are appreciated!

[TrevorM3]

You should be cracking 10's with a comp iirc. I'm doing 11.1 with a non CP, on Pzero's, on a 85 degree day.

I think r888's would be overkill for someone who is stock. The car doesn't have any problems hooking out of the hole in stock form.

[mm5300]

Originally Posted by TrevorM3

You should be cracking 10's with a comp iirc. I'm doing 11.1 with a non CP, on Pzero's, on a 85 degree day.

I think r888's would be overkill for someone who is stock. The car doesn't have any problems hooking out of the hole in stock form.

Thanks TrevorM3. I would like to crack the 10's. I just thought maybe getting some better traction might help, plus I eventually will do some kind of flash, so I would imagine I would need them then.

What have you used for gas on your runs?

[TrevorM3]

Originally Posted by mm5300

Thanks TrevorM3. I would like to crack the 10's. I just thought maybe getting some better traction might help, plus I eventually will do some kind of flash, so I would imagine I would need them then.

What have you used for gas on your runs?

93. I actually can't remember how much gas i had in the car at the time.


Do you have your timeslip from the track?

[SickGTR]

A better tire can only help! R888 are my favorite!!

[mm5300]

Originally Posted by TrevorM3

93. I actually can't remember how much gas i had in the car at the time.


Do you have your timeslip from the track?

Here's the timeslip from the best run.

https://f90.bimmerpost.com/forums/at...1&d=1625105406

[TrevorM3]

hmmm too lazy to post a timeslip pic but i'm reading mine..

.434
1.686
4.680
7.170
98.57
9.317

ET 11.12
MPH 125.4


I'm trapping 3mph faster than you. You're letting the car shift itself right?

[bcparker2]

my times on my dragy run are identical to Trevor's except I let out early so my 1/4 was 11.3 because I wasn't at a track and 100 on the feeder is fast enough even in the middle of the night. I have a 19 non comp with heavy everything including my fat 250 lb ass.

[GTATX]

I'm heavily modded and tuned but my best times have always come via launch control and let it handle 1st 3 shifts and I take over 3rd to 4th and 4th to 5th and let 5th run until 1/4 mile. I trap around 136-139 depending on weather. I normally shift around 5500 rpm.

[mm5300]

Originally Posted by TrevorM3

hmmm too lazy to post a timeslip pic but i'm reading mine..

.434
1.686
4.680
7.170
98.57
9.317

ET 11.12
MPH 125.4

I'm trapping 3mph faster than you. You're letting the car shift itself right?

Yes, I'm using launch control and letting it shift all the way. I'm def no expert on analyzing the time slips, but the 11.3 I ran 2 weeks before trapped a higher mph. So not sure if that's from the added gas weight. This run was with less than 1/4 tank.

https://f90.bimmerpost.com/forums/at...1&d=1625144812

[DrivenAgain]

2018 CCBs E30 10.85 128.45 Dragy run no tune.

[mm5300]

Originally Posted by DrivenAgain

2018 CCBs E30 10.85 128.45 Dragy run no tune.

So you can run E30 on a stock car? I've never really done any changes with gas. If it's ok to run it, I'll probably give it a try.

[DrivenAgain]

Originally Posted by mm5300

So you can run E30 on a stock car? I've never really done any changes with gas. If it's ok to run it, I'll probably give it a try.

Originally Posted by mm5300

So you can run E30 on a stock car? I've never really done any changes with gas. If it's ok to run it, I'll probably give it a try.

Yes, worth at least 1mph in trap

[GTATX]

Originally Posted by mm5300

So you can run E30 on a stock car? I've never really done any changes with gas. If it's ok to run it, I'll probably give it a try.

It's should help, I'm tuned and run between e46-48 without any issues.

[TrevorM3]

wouldn't running e30 w/o a tune damage something? might as well throw a piggyback on... that's probably safer than fueling w/o a tune..

[GTATX]

Originally Posted by TrevorM3

wouldn't running e30 w/o a tune damage something? might as well throw a piggyback on... that's probably safer than fueling w/o a tune..

Without tune as long as u don't have loss of power or misfire u should be fine.

[mm5300]

Originally Posted by TrevorM3

You should be cracking 10's with a comp iirc. I'm doing 11.1 with a non CP, on Pzero's, on a 85 degree day.

I think r888's would be overkill for someone who is stock. The car doesn't have any problems hooking out of the hole in stock form.

First of all, I think I'm an idiot I had looked at videos of the launch control, but it seems like I was looking at the F10 where you adjust the RPM. I was somewhat manually doing that by keeping the RPMs up before I let off the gas. I just realized that I should be keeping the gas down to activate LC. I had seen it pop up previously and thought I was doing it correctly, but it might have been in LC and then let off the gas and went into more of a power brake situation.

Now that that's out of the way, I went to the track last Friday and when I did the correct LC, I couldn't get any traction. I'm not sure if it was the track that particular night, but it was after sunset and the temp was probably around 80-85. Should I now consider some type of street slick to get traction with the LC? If so, what types are people running successfully with? I know the Toyo R888's are mentioned and I went to a local wheel/tire place and they were thinking some Nitto's. They mentioned NT05 in the front and NT555RII in the rear.

These will likely only be at the track, but what to make sure I don't run into any rubbing issues, so what are the recommended sizes? I've seen some people mention using 275 square, but others 305 with 19's. Just seeing what's out there for recommendations. Thanks all!

[TrevorM3]

Originally Posted by mm5300

First of all, I think I'm an idiot I had looked at videos of the launch control, but it seems like I was looking at the F10 where you adjust the RPM. I was somewhat manually doing that by keeping the RPMs up before I let off the gas. I just realized that I should be keeping the gas down to activate LC. I had seen it pop up previously and thought I was doing it correctly, but it might have been in LC and then let off the gas and went into more of a power brake situation.

Now that that's out of the way, I went to the track last Friday and when I did the correct LC, I couldn't get any traction. I'm not sure if it was the track that particular night, but it was after sunset and the temp was probably around 80-85. Should I now consider some type of street slick to get traction with the LC? If so, what types are people running successfully with? I know the Toyo R888's are mentioned and I went to a local wheel/tire place and they were thinking some Nitto's. They mentioned NT05 in the front and NT555RII in the rear.

These will likely only be at the track, but what to make sure I don't run into any rubbing issues, so what are the recommended sizes? I've seen some people mention using 275 square, but others 305 with 19's. Just seeing what's out there for recommendations. Thanks all!

again, if you are stock, i dont really see how you could be having traction issues.. the car dead hooks out of the hole.. even on pzero's which everyone on this forum hates..

[DrivenAgain]

Originally Posted by TrevorM3

wouldn't running e30 w/o a tune damage something? might as well throw a piggyback on... that's probably safer than fueling w/o a tune..

no it wont damage anything. its much less volume than regular gas so logging your fuel rail pressure is key.

[gpdriver17]

I always ran E30-E50 without any issues stock. Definitely noticed improvements, measured by dragy.

[gpdriver17]

Originally Posted by TrevorM3

again, if you are stock, i dont really see how you could be having traction issues.. the car dead hooks out of the hole.. even on pzero's which everyone on this forum hates..

I had issues hooking up with them, but it was 30 degrees out on the street. Maybe getting some heat in them will help.

[apsuard]

Originally Posted by gpdriver17

I had issues hooking up with them, but it was 30 degrees out on the street. Maybe getting some heat in them will help.

I would stay away from the NT555R2. I ran them on all 4 corners of my E63 275/35R20 front and 305/30R20 rear and I wasn’t impressed. Traction was no better than MPS4S, sketchy in rain, no rim protection, and overall rough ride. My suggestion to add grip would Toyo R888R in 285/35R20 square