Swap 1/4 Mile Thread

[ed94r]

What is amazing to me...is that you picked up 1 mph on the big end, all else being equal.

On paper, that's a 10 horsepower increase.

Ed

[samiam3356]

Damn, you're lucky!

[MacBudd541]

That's amazing. Your 13.0 is awesome, even with a 2.0 60'. But your 107 trap speed blows my mind. What's done to the s52? Did you dyno it?

My donor car was a 95 M3 that had already been S52 swapped. I knew very little about the mods done to it and I was surprised to find some goodies when putting it in my car. Aluminum flywheel, oil pump nut already welded and a wax plug in the back of the head indicating a rebuild. This all told me somebody had put some thought into the build of this e36. There was a Dinan chip in the car but it had ews (i tried it). I got a TRM chip for pink injectors, stock MAF, aluminum flywheel, 7k rpm. I am very impressed with the time I put down. Seems to be one of the quicker NA street car swaps out there. I am running the zf320 with 3.46LSD.
We are throwing a dyno day at HPF in portland on 10/22. There will be several e30s including other s52 cars there so I will get a feel for what else is done or how healthy the engine is.

-Mac

[JGood]

Last week I ran my car at PIR. Just a bit slower than my run last month at the Woodburn track but good runs none the less. There was a new 335i there too and I was beating him by a few tenths. Here is last week at PIR:


And last month at Woodburn:

That's amazing. Your 13.0 is awesome, even with a 2.0 60'. But your 107 trap speed blows my mind. What's done to the s52? Did you dyno it?

[sohc12vm20]

Last week I ran my car at PIR. Just a bit slower than my run last month at the Woodburn track but good runs none the less. There was a new 335i there too and I was beating him by a few tenths. Here is last week at PIR:



And last month at Woodburn:

What modds? very nice.. (borat voice) Im dumping a s52 obd1 in me car, would love to see high 13's!

[MacBudd541]

Last week I ran my car at PIR. Just a bit slower than my run last month at the Woodburn track but good runs none the less. There was a new 335i there too and I was beating him by a few tenths. Here is last week at PIR:



And last month at Woodburn:

[samiam3356]

Not lifting was faster, every single gear

[JGood]

.2 (faster)was about the difference between powershifting every gear w/spinning and lift/shifting. Albeit on a straight axle mustang.

Which was faster?

I noticed when I ran the v710 r-comps, I barely lost any of my acceleration rate with the spinning induced by powershifting. The slip angle (not sure what you'd call it in terms of straight line traction) of v710's is pretty high, so even though they were spinning, the car was still accelerating almost as fast as it would if they had full traction. With street tires however, there was a noticeable decrease in acceleration rate with the spinning into 2nd gear, when they finally hooked in 2nd gear it threw me back in the seat, telling me I lost a lot while I was spinning.

[samiam3356]

I was running 15 psi in the r-comps, 35 in the street tires. Not sure what you mean by a two stage clutch launch.




I'm lifting for 2nd (probably not enough, as it does spin into 2nd), and lifting just enough to keep it from bouncing off the limiter in 3rd, and basically keeping it floored into 4th (which is irrelevant, I'm 99% sure I'm across the line in 4th. 7000 RPM's is 95mph in my car, and that's what I trap at, which is also my redline and what I shift at, but I stay in it until 100 or so).

.2 (faster)was about the difference between powershifting every gear w/spinning and lift/shifting. Albeit on a straight axle mustang.

[Wanganstyle]

if you are launching an AWD car (esp one with turbo), the launch technique ends up being a 2 stage affair -subaru loves to blow up transmission on launch, so this is another reason - its also very easy to bog if turbo not loaded enough!

-usually this is done to pre-load the driveline as the tree goes from yellow-yellow with the first stage of clutch let up also spooling turbo like brake boosting.

the second stage of release is to take off and fight bogging paired with more throttle, if you were running super low PSI and bogging a bit with 2wd perhaps a 2 step clutch launch MAY help. May not lol

[JGood]

perhaps lower rear tire pressures and try a 2 stage clutch launch like an AWD car?

I was running 15 psi in the r-comps, 35 in the street tires. Not sure what you mean by a two stage clutch launch.

Are you lifting and shifting or keeping the bitch pegged?

I'm lifting for 2nd (probably not enough, as it does spin into 2nd), and lifting just enough to keep it from bouncing off the limiter in 3rd, and basically keeping it floored into 4th (which is irrelevant, I'm 99% sure I'm across the line in 4th. 7000 RPM's is 95mph in my car, and that's what I trap at, which is also my redline and what I shift at, but I stay in it until 100 or so).

[samiam3356]

Are you lifting and shifting or keeping the bitch pegged?

[Wanganstyle]

perhaps lower rear tire pressures and try a 2 stage clutch launch like an AWD car?

[JGood]

Two years ago I ran 14.4@94 with my m50, g260, and 3.73 LSD, car weight is 2870lb. I was using v710's which seemed to launch well but I had to run such low PSI that I think they hurt my trap speed. I was only getting 2.2 60ft's because I was dumping the clutch at 5k instead of slipping it like I should have, so the tires hooked, engine bogged, and it took off. My times were 14.4-14.7 all night.

I put s50 cams and software in, dyno'd 188whp, and this past weekend ran 14.5@95. I was using street tires, slipping the clutch, and was getting high 2.2 - 2.3 60 ft's. I was spinning in 1st a little (or a lot if I messed up the launch), spun a good 1/2 second hitting 2nd gear. My times were 14.5-14.8 all night. I'm pretty disappointed. I'd like to go back with the slicks again. But I still feel I should have been able to do better then 2.2 60' with the good high performance summer tires.

Any tips? I was holding the RPM's at 3k or so, slowly leaving off the clutch and as the car speed matched the RPM's I went full throttle. Sometimes I spun, sometimes it bogged, and I'd be close to 2.4 60'. But sometimes it seemed to work perfect and I'd still be over 2.2 60'.

[samiam3356]

I ran my car last night at the Woodburn dragstrip. I have never gone to the strip before and my first run was my best for the night. Here is the slip.

It was 80 degrees out.

1989 325i
S52
zf320
3.46lsd
TRM chip, 21lb/7k
ebay headers, no cat, no name muffler
2700lbs last week on a truck scale
225/50r15 in back Kuhmo ecsta cheap street tires

I am very happy with the result and now that I have been to the strip I cant wait to go back.

Damn nice times! Very similar to my setup. The car feels fast but I guess I wouldn't expect it to be that deep into the 13's. Been down a drag strip a couple hundred times in different cars, some fast, others not.

I've got to get mine out there and see what it will do. Not anytime soon though as the heat around the Southeast right now is miserable and I don't want any excuses for it not putting down decent times.

BTW my set up is s52 obd1, fresh 3.46lsd, g260, need to get it weighed as well.