Swap 1/4 Mile Thread

[PiercedE30]

i'm wondering how my high comp m50 is going to due compared the the normal m50's and s50's..........this will be interesting.......got my top end gaskets today too......will make a thread about it at a later point.....

[KangamangusDriver]

Dudes, if you're planning on dropping in a m50 to help your 1/4mi times you're doing it wrong! The m50 is a better motor all around, but its no speed demon.

I agree, no speed demon.
But a hell of a good time, trust me!

Dont sweat it too much, you will enjoy the different style of power that the
M50 delivers, highway travel will never be so much fun.

May not be the quickest 1/4 mile swap, however the power is so usefull.
Torque down low, revs that pull hard create a very fun car to drive.
Power you can use when screaming up canyons in third!!

Obviously a S50/52 will be faster, however that may not be in your budget.
I know it wasnt in mine at the time, I opted for the M50 and it was a blast!

[325Projectz]

Dudes, if you're planning on dropping in a m50 to help your 1/4mi times you're doing it wrong! The m50 is a better motor all around, but its no speed demon.

[JGood]

M20's usually dyno, what, 140-150rwhp? M50's are supposed to be around 160-170rwhp right? So.... Why does anyone expect it to drop seconds off the 1/4 time with only about 20whp? My eta's chip gave me about that much, I'm lucky if it dropped 2 tenths.

I know that's only peak numbers, and power band is more important (and m50's with the variable valve timing are very good at broadening the power band), but I think everyone is being a little too optimistic.

S50's put out about 200rwhp, and run about 1-1.5 seconds faster then a stock m20 (when put into an e30). So with less then half the hp increase (in the case of the m50), I'd expect less then half the gain: ~.4-.5 seconds faster in the 1/4. Nobody has consistent runs unless they are a GOOD drag racer (I doubt anyone here is), so take the numbers with a grain of salt... and you'll see there's no surprises here.

Even when I drag raced my eta (I just HAD to see what it could do...) My runs varied by over .5 seconds, from 16.3 to 16.9. It's hard not to launch an eta properly, wheel spin really doesn't happen. That goes to show, the same driver in the same car can be off by that much, imagine a different car with a different driver.

[DREWHALL]

That's what I figured. I was thinking 14's fairly easy. I'm kind of about to do the swap, but if I find out I'm still only going to run 15's I'm gonna be pissed!

[Jean]

So the M50 cars are only pulling like 15's/high 14's? That sucks....

When in reality should be faster than an e30 m3 (or I would think with basic bolt ons that people normally do to the m50).... maybe it's the wrong gearing and or driver...

[DREWHALL]

So the M50 cars are only pulling like 15's/high 14's? That sucks....

[BingM3]

So I put on used Motorsport 17" Double Spoke e36M3 rims on my car yesteday, and the acceleration is night and day vs. the 18's I had.

I hope to hit high 13's:) when I G-Tech it.

[digger]

For sure they are low. Bone stock E36 M3's have been known to hit 13.9 on street tires (I got a 14.2 stock with 2.1 60' in my M3 at 1000 feet). And considering S50 cars are quicker than E46 M3's, which run 13.2's, we should be able to hit high 12's.

I think some guys on here might be living in higher elevation areas affecting their times and, of course, most seem to be running puny tires.

IF S50E30 cars are faster than E46 M3 (debatable for stock S50 depends on type of race aswell) then all that means is you will trap higher. The faster ET means the car the leaves the line better it does not correlate to the better performer on say the highway which trap speed indicates. The M3 has very good traction, the same cannot be said for an E30 so the logic behind a 12s ET is a bit flawed IMO.

An ALPINA B6S (3.5 M30 260hp 237lb-ft 2.79 LSD 2950lbs) was capable of a 14.4 @ 97

A Hartge H35 (3.5 M30 260hp 257lb-ft) was capable of 14.7 @ 9x

so an S50 should be capable of a mid to high 13 @ ~100mph with a few weight saving strategies, a few bolt ons, an appropriate LSD ratio and a good driver. But low to mid 14s is more realistic

There should be a list of documented runs showing the time sheet, mods, weight, tyres, track, conditions etc etc if there isn't already.

[mazur]

12's is a different ballgame..:)

Eh...guys with stock e46 M3 with drag radials are pulling 12's.

[BingM3]

12's is a different ballgame..:)

[mazur]

I think its fair to say the examples in this thread are on the low side of what the cars are capable of.

I know that mine would do low 13s with a good launch/driver.

For sure they are low. Bone stock E36 M3's have been known to hit 13.9 on street tires (I got a 14.2 stock with 2.1 60' in my M3 at 1000 feet). And considering S50 cars are quicker than E46 M3's, which run 13.2's, we should be able to hit high 12's.

I think some guys on here might be living in higher elevation areas affecting their times and, of course, most seem to be running puny tires.

[Jean]

You ought to or I'll ask mods to ban you j/k

[ATLe30]

1987 325is. m52, with s52 cams, software, stromong exhaust, long tubes, pulleys, conforti intake with custom airbox, 227rwhp. havent taken it to the strip yet. an M52 with these mods puts your engine output just north of an STOCK s50/s52. can expect some ok times?

[Jean]

-Truth. The et clock doesn't start until your tire passes the line

Correct.