bmwe21.net forums

Does anyone on here know what itb throttle bodies would fit on the m52 engine without too much messing about

This guy should have kits available sometime this year...

http://www.e30tech.com/forum/showpost.p ... stcount=99

http://www.racehead.com.au/

Probably not the answer you are looking for but worth consideration, for the cost of throttle bodies and ecu etc you will be hitting the cost of a 36 m3 Evo lump. Would you not be better swapping one in? It will give more power for easier work.

I can understand if you want to keep the m52. I'd assume if you did the throttle bodies from a 36 m3 Evo would bolt straight up, have a linkage system that would be simple to use and would be cheaper than an aftermarket kit.

Dbilas and Jenvey do off the shelf kits for just under £2k. You'll then need to sort ecu and mapping. You could buy their manifolds for about £450 - 500 and use S50 ITB's but it's a bit of work. You can get an s54 for about £1850.

How difficult would that be to drop an s54 engine in and what else would be needed

What gave you the throttle bodies idea then.

M3 engine yea not a problem. You problem is gearbox, diff and half shafts will need an upgrade so look at about 2k for all that + cost of engine.

Don't forget you will be needing massive brakes.

Ben is the chap to ask but it isn't much harder than an m52 swap. The problem then though, is you'll be trying to put 300+bhp through a stock e21 rear end. (You're probably getting close to the maximum for a stock e21 LSD and driveshafts already) You'll also be wanting to change to an M3 gearbox, so you'll also need a digital speedo conversion and your brakes would probably need upgrading too. For what it's worth, I'd sort your rear beam / diff out next and then you have a choice of routes to more power if you want it. ITB's are great for looks and induction noise but if it's grunt you want, a 3.0 conversion like Nas doing, is probably a better option.