735i mods

shootupbuddie101 · Post by **shootupbuddie101** » Tue Apr 22, 2008 8:58 am

I have a 1990 735i automatic with a cold air intake and a performance ECU from Bavarian Autosport. I was thinking about putting in an MSD 6a ignition system for more power but what else can I do to make it faster??

badbadm · Post by **badbadm** » Tue Apr 22, 2008 5:34 pm

turbo.

http://www.turbochargingdynamics.com/

colin · Post by **colin** » Tue Apr 22, 2008 6:31 pm

Ya know, I was gonna say something smart like "shoot it out of a cannon!" ... but yeah. Turbo.

Somebody brought an E34 with a turbo'd M30 in it to an autocross a couple of years ago. It was sick. Couldn't keep the car straight.

shootupbuddie101 · Post by **shootupbuddie101** » Tue Apr 22, 2008 7:47 pm

I do agree that a turbo would be sick, however I am just entering college and a turbo isn't the cheapest option.

RAYADAM · Post by **RAYADAM** » Tue Apr 22, 2008 8:26 pm

shootupbuddie101 wrote:I do agree that a turbo would be sick, however I am just entering college and a turbo isn't the cheapest option.

of course I second badbadm suggestion of a turbo (the M30 is one engine that could handle it

)

you want a cheap clean upgrade, if your production date is older 7/90(which it is probably) , you then have a 3.91 differential...find yourself a used 1991-92 735i/il diff which would be a 4.27 !!!

Ray

shootupbuddie101 · Post by **shootupbuddie101** » Sun Apr 27, 2008 3:32 pm

The date of production is 2/90, now what? Can I still play with the differentials?

RAYADAM · Post by **RAYADAM** » Mon Apr 28, 2008 7:57 am

shootupbuddie101 wrote:The date of production is 2/90, now what? Can I still play with the differentials?

absolutely! but be sure you are getting a 4.27(LSD would be a bonus!).
there should be a medal tag attached to one of the cover mounting bolts in which will indicate the ratio...

in rare cases it is not there,spin the input flange about 4 1/4 turns should turn the output flanges 1 complete revolution.

Ray

shootupbuddie101 · Post by **shootupbuddie101** » Tue Apr 29, 2008 8:31 am

Alright sounds good. At highway speeds will the engine be running higer rpms though??