24v input on couple items

[Varinn]

Planning to 24v my car soon, trying to round up parts now but need a little input on a couple things. The car is 90% daily driver with some trackdays and autocross. Primary goal is to have a smoother running motor with more significantly more torque and an increase in mid-top end.

Engine choices are stock S52B32 and M52B28 with cams. Will be using G260, car currently has V3.91 diff. Engines will come complete with all accesories/harness, starters etc

1. Flywheel, should I use stock 24v dual mass or modify/install my 13lb m20? Car is a daily driver, the 24v motors seem to rev pretty quick as they are and I worry the 13lb would be overkill for a street car, it's rough enough on the slower revving m20. Great on the track though.

2. Differential, what gearing for each motor behind a G260? Found a calculator that seems to say a 3.46 is a close match to the stock ratios as they were in the e36 donors with ZF's. I was thinking even a 3.25 in an e30 would be good as they would have the power to pull the lighter car without wasting time shifting too often on the track and in town.

3. Airbox. Castros, or modified stock? Is there any downside to running a stock airbox? I do not care about "potential HP gains" from aftermarket, I want a smooth running engine.

4. Mounts, e28 M5 or AKG? I worry the AKG mounts will add lots of noise/vibrations, but the M5 mounts seem to get a twist to them from the angle difference

5. Brakes, I plan to shift my stock booster over as both it and my master are less then 2 months old. Is this still a heavily debated idea or has it become fairly accepted? I will modify and offset the clevis for correct alignment.

6. "Bang for buck", is the M52B28 worth the effort and cost savings or does it pale in comparison to the S52? I am not looking to go overboard on the power but do not want to swap and be dissappointed with the result.

[Dphraner]

hey, just my 2cents, i would go for the s52. i have a m52 with cams m50 intake manifold lightweight flywheel ect and i wish i had a little more power. i wasnt dissapointed after the swap but i thought it would have more power. I would go for the akg mounts, i have them and they worked great. they add a little nvh but well worth it. light weight flywheel works great on mine but i had my computer tuned for it. if you have questions just let me know the swap is still fresh in my mind

[evandael]

1. use stock dual mass so you can use the e36m 240mm clutch. the stock unit can reportedly hold up to 350 ft lbs.

2. keep your 3.91 and use proper sized tires.

3. modify stock, save some money for the next part..

4. AKG. don't waste your time or money on the e28 mounts, they will fail and will cause drivetrain misalignment.

5. slotted firewall and stock booster seems common enough but IMO, sell them and pick up an audi A4 booster. no hack-job firewall cutting.

6. what cams on the m52? if they are s52 cams, IMO just go with the s52 right off the bat unless there is a significant cost savings (more than $700). if you are unsatisfied with the s52 power, pick up some schrick, VAC, MM, Sunbelt, or DSR cams.. the extra displacement leaves some headroom for more power (somewhere in the vicinity of 270hp with street cams)

good luck!

[Varinn]

Thanks for the input so far

1. Flywheel I will try and get the dual mass unit with the motor, if it is not included I will go with the m20 fly

2. 3.91 it is, it's a brand new rebuild so it's plenty reliable. I run 205/55 15 S-drives street and 225/50 15 RA1's for track. I will likely be finding a set of 16's eventually and my S-drives will become 225's as well. A differential is easily changed later anyways

3. Stock airbox mod sounds easy enough. Does the e36 unit fit in an e30 or do I modify the m20 box to open up the passage?

4. AKG it is

5. I will do some research on this audi setup, I had never heard of it before

6. S52 cams would be the choice. I'm looking at $2500-$2900 for a stock S52 or $800-$1400 for the M52B28 +$300 for cams and 300-$400 for M50 manifold. The S52 stock will be more power than I'll ever need so I don't care to do manifold swap/cams as I want to keep the torque for daily driving.

[evandael]

in my opinion, i'd go for the m52 + cams if the price differential is that much.

i plan on modifying an e36 airbox to fit into my bay, with a late model rad/reservoir and ABS. others have used airboxes from the e30 m20 and m42, e28 528e, and e34 m50.

check out mtlbloodshot's build thread http://www.r3vlimited.com/board/show...235231&page=18 and this thread http://www.r3vlimited.com/board/showthread.php?t=275883 on the audi booster. it's a very common part in junkyards, having been installed on numerous audi models, and imo it's a superior option (dual diaphragm.. also, mine came with a 25.4mm master cylinder)

a 3.91 with those size tires will be great and if you do decide to go with the m52 will give you a slight bump in gearing relative to s52/g260/3.73 swaps.

[smerfs]

I've driven both an m52 swapped car and an s52, and it was a very clear decision to me for what I should swap in. S52 seems to have the most "bang for your buck" if you aren't running a turbo or planning on it in the near future. From my brief search of an m52, it was harder to find a clean engine compared to an s52, but that was probably just the current market

Castros airbox will clean up your engine bay a lot and make it look somewhat factory.

The easiest brake booster setup is to run an IX master with a 2002 remote res (in my mind), no firewall slotting required, and the manifold just has to have some fins shaved off. I don't know enough about the audi booster setup, so I wont comment on it. My biggest reason for the IX/2002 is simply because it's free, hahah

I would run an ZF320 just for ease of install and not needing to twist the selector arm and modify the brace, but that's just me. If you went that option - 3.25 is the way to go.

[dude8383]

Why not go for the ZF tranny? You're already replacing all of that stuff. Sure it will cost a bit more but why not do it right the first time around?? I too think you should get an S52. You say that its enough power now... but you'll be wanting more later and you'll curse yourself for not getting it then.

It doesn't make sense to save 500-700 now only to end up spending more than that to get it done.

Are you doing the work yourself or is a shop working on the car?

[smerfs]

OP bought an s52. The race to who finishes their swaps first is on!

[Varinn]

What the hell? How did you find out that fast Kent? I put some cash down on an S52B32 this morning but I wont be getting delivery of the motor for a month or so as I need to sort out my workspace. I will be having a BMW tech friend give the engine new gaskets, water pump, safety wire pump nut etc. afterwards another friend has a hoist and we'll do a bottom up install of the motor/trans instead of feeding it in from above. I'll answer the rest of the responses in here after work tonight.

PS: No race bud, I have plenty of time to stretch this out as I have school coming up again in the fall (so 2 months no work) and I'd rather do it right than try to rush it in before winter. If it happens it happens, it all depends on how the cards play out.

[smerfs]

I have my ways of finding out information. I'm looking forward to seeing your build! It seems there are quite a few s52 e30's running around locally now

[Varinn]

Should I be looking to upgrading the stock m20 clutch to something beefier or will it handle a stock S52 fine? I would prefer to keep as close to oem feel as possible

[übersteuern]

Start with your stock clutch, then upgrade if you smoke it. In my opinion, a race clutch does not make for a comfortable daily driver.

[smerfs]

replacing a clutch/flywheel is a helluva lot easier out of the car than it is inside.