Help! M20B27 Performance Upgrades?

[squidrope]

Looking for advise on getting more usable HP out of an ETA for crapcan racing.

Please don't tell me to do an "i" head swap, motor swap, or forced induction.

We want to race (and beat) the other e-30's with an ETA


Some things we're considering.

1a-Removing the vibration dampener and putting on a smaller diameter pulley
1b-Increasing alt. pulley and removing every other blade on water pump

2-Matching ports to manifolds

3-"Cleaning up" casting seams in the in/ex ports.

5-Windage tray?

What we've done-

Lightened flywheel
Electric fan
Weight reduction (car weighs 2,054lbs)
Block squared to crank, deck cleaned, freeze plugs, honed
Pistons cleaned and new rings
Warped head machined flat (-.018")
Lapped valves
PS deleted
Oil pan baffle
Oil passages cleaned
ETA-Chipped


Thoughts or other ideas?

TIA

[3vilE30]

"i" electronics + chip
Bigger Cam + dual valve springs
Swap Round intakes i and seta

If you wanna get crazy e85 but you need static cr of at least 10:1 and a standalone or remapped chip with massive injectors and fuel pump.

[digger]

engine aside don't forget take some weight out of the car and use a shorter diff. don't remove the vibration damper even though you wont be turning a lot of rpm it has a important job to do, a lighter FW is the better option.

[squidrope]

engine aside don't forget take some weight out of the car and use a shorter diff. don't remove the vibration damper even though you wont be turning a lot of rpm it has a important job to do, a lighter FW is the better option.

Diff is 3.73 LSD 65/35
Took ton of weight out of the car.
FW has been lightened


Does anyone know of a smaller vibration damper that I could adapt to fit? (I have a machine shop)

[Regnar75]

2k lb eta must be a blast to drive!

i dont know much about exhaust systems and whats tried and true to work for m20's but maybe since you have a machine shop you can try and make a better exhaust system, something that actually does a decent job scavenging? and better flow than the ETA exhaust. I'm all about this idea of making the eta kick ass and take names.

[squidrope]

2k lb eta must be a blast to drive!

i dont know much about exhaust systems and whats tried and true to work for m20's but maybe since you have a machine shop you can try and make a better exhaust system, something that actually does a decent job scavenging? and better flow than the ETA exhaust. I'm all about this idea of making the eta kick ass and take names.

It's lots of fun to drive https://www.youtube.com/watch?v=h70fFVvsBHA 50 passes in 17 minutes.

I should look into a header for this. We're currently running stock ex. man. to cherry bomb. (no cat or res)

[Bullhead]

It's lots of fun to drive https://www.youtube.com/watch?v=h70fFVvsBHA 50 passes in 17 minutes.

I should look into a header for this. We're currently running stock ex. man. to cherry bomb.

Ebay header isn't bad, I think Garagistic makes one too but I'm not sure. I have talked about the exhaust with others and it seems 2.5" is the right number, Y pipe at the header into 2.5" all the way back or do the stock I setup. If your racing I would just run a muffler no res or cat unless it's spec. Magnaflow and Vibrant both sound decent without a cat or resonator imo.

[squidrope]

Ebay header isn't bad, I think Garagistic makes one too but I'm not sure. I have talked about the exhaust with others and it seems 2.5" is the right number, Y pipe at the header into 2.5" all the way back or do the stock I setup. If your racing I would just run a muffler no res or cat unless it's spec. Magnaflow and Vibrant both sound decent without a cat or resonator imo.

Just searched Ebay and found a header that fits both the b27 and b25. Will the same header work on a B25 and B27?

The Y pipes also have 2 outlets. Is this advantageous to just running the 2 into one 2.5", or should I run 2 pipes to the muffler?

[Ether-D]

Just searched Ebay and found a header that fits both the b27 and b25. Will the same header work on a B25 and B27?

The Y pipes also have 2 outlets. Is this advantageous to just running the 2 into one 2.5", or should I run 2 pipes to the muffler?

Yes.

That racing vid was kickass. ETA FTW.

[Regnar75]

http://www.r3vlimited.com/board/showthread.php?t=322899

i was reading up in this thread and theres some cool info about things like most efficient distance of y pipe from head, info on sizings etc. if your all about shaving weight maybe you should stick with a y-pipe into a single, and maybe shave a few feet of metal off and put it out the passenger side by the tire?

whats your intake set up like?

have you done anything to try and keep the engine bay cooler?

[squidrope]

http://www.r3vlimited.com/board/showthread.php?t=322899

i was reading up in this thread and theres some cool info about things like most efficient distance of y pipe from head, info on sizings etc. if your all about shaving weight maybe you should stick with a y-pipe into a single, and maybe shave a few feet of metal off and put it out the passenger side by the tire?

whats your intake set up like?

have you done anything to try and keep the engine bay cooler?

We do run the exhaust out the passenger side in front of the rear tire.

Intake set up is stock.(maybe piping it to where headlight used to be?)

We run an air dam below the bumper and the headlight areas have plastic over them. Our engine has never come close to overheating.(except when we lost our fan belt) http://www.murileemartin.com/UG/LNHF...-IMG_6014.html

Aerodynamics be damned, the Arooogah Horn on the roof has to stay!

[Regnar75]

yea i would never ever recommend removing that horn. i guess if your down to 2000lbs you have definitely thought of some of that stuff. those K1s? there comes a point when i guess you just start drilling holes in the non structural parts of the car haha.



BTW does your horn button say Hooter?

[squidrope]

yea i would never ever recommend removing that horn. i guess if your down to 2000lbs you have definitely thought of some of that stuff. those K1s? there comes a point when i guess you just start drilling holes in the non structural parts of the car haha.



BTW does your horn button say Hooter?

Kosei K1's-good eye

The horn is labeled "Hooter"! (As is the button on our dash that operates it) :)

In the movie Chitty Chitty Bang Bang (our theme) Dick Van Dyke says "A couple good squeezes of the Hooter would have prevented this" to Truly Scrumptious after a near miss accident where she ends up in a pond. We had to have a hooter!

[E30 Wagen]

Modify the head to accept a 325i cam and dual valve springs, go to motronic 1.3 w/ chip, along with port matching to a 325i intake manifold, then of course using a 325i throttle. I would actually try running a taller diff than a 3.73, might help you reach higher speeds on the straights??

[Regnar75]

^as much as i love the 2.7i and variants, i think he wants to keep it almost all ETA as far as engine internals go so that he can tell people hes beating them in an ETA.

We want to race (and beat) the other e-30's with an ETA