Disappointing dyno results

[e30gumball]

Whats your ecu number ?
i wouldnt mind sending you over a chip to see if it betters the conforti chip (they often do)

Just a thought.

[lukasbmw]

Considering AA got a 94 325i to dyno 176.8 HP and 164.1 ft-lbs with just their intake, exhaust, and software on a MUSTANG Dyno, I think my stuff should be much higher. That's the same power with more TQ and a better TQ curve.

http://aatuning.com/dyno/94-325i%20vs%20AAChip%20Exh%20CAI.asp

ECU # is 413, but I'm sticking with the conforti software. The line is exactly how it should look. I really don't think tuning is the issue.

I suspect my exhaust system is holding my car back so we will see if I am correct.

Jonathan, you are exactly correct. The Valve float is due to thew fact that I am still running stock springs with the cams. Stu warned me of this but I'll deal with it later when I rebuild to a stroker.

[e30gumball]

are these power figures at the wheels ?
or are they flywheel.

[bimmerphile]

are these power figures at the wheels ?
or are they flywheel.

176 RWHP = rear wheel horsepower
156 RWT = rear wheel torque

[e30gumball]

Are the U.S models lower power in general over the euro models ?

My M20 E30 powered cab made 196rwhp with 220rwtq

[bimmerphile]

Are the U.S models lower power in general over the euro models ?

My M20 E30 powered cab made 196rwhp with 220rwtq

In general, Yes.


For 1, Eric has an M50


Secondly, your M20 is pushing 237bhp/265tq (assuming 17% drivetrain loss)

I find that hard to believe, but then again, I can't remember what you did with your motor.

[e30gumball]

It is a 0.5mm overbore on a 2.7 engine with lightened forged pistons, corrillo con rods, knife edged crank, lightened flywheel, tarmac spec race head, kent cam, alloy head gear, vernier pulley, bored throttle body, 6 branch with full racing exhaust,

I was thinking more along the lines of 230hp at the flywheel.

here is a clip of the car pulling away at the lights, http://e30gumball.users.btopenworld.com/gas50.WMV

i am using 102 ron fuel which is a little higher than the states though.

[reelizmpro]

Eric, sorry to hear about the numbers but I kinda figured it would be hard for stock M50's with just M3 cams to make 200rwhp. However, I'm sure you can make more than 176rwhp. Have you decided on what to do about engine management? Are you sure the engine has good compression?

[PrinceE30]

Re: Disappointing dyno results

I'll have to post the graph tomorrow, but the results are:

176 RWHP
156 RWT

My M50 put down 162 RWHP/156 RWT with just an intake and super sprint e30 exhaust.

I have since added M3 cams, and the M3 cam chip (Conforti software).

M50TU's with intake, M3 cams, proper software, and open exhaust typically make 230-240hp at the crank. Therefore I was expecting 230 crank hp as my exhaust system still needs to be opened up.

With a 15% drivetrain loss factor my numbers equal about 208 crank hp and 183 crank tq. Nothing to brag about.

The car was running very lean at first which really makes me question the conforti software (others who were running conforti software also were running lean). My Air Fuel curve only reached a safe level once I bumped up the fuel pressure to 58PSI (from stock 44psi). The bump in fuel pressure definitely improved drivability. That said, my air/fuel curve is pretty goddamn flat which I'm obviously happy about. The air/fuel curve on my modded m20 was up and down like whore on X jumping up and down on a waterbed.

Next step:

Cut off the cat
Install the aluminum manifolds
Get a new fuel pressure regulator

Re-dyno and hope my numbers improve. I want to see at least 230 crank hp from this bitch.

Other notable pulls:

E36 M3 3.2 with intake/exhaust/software 216RWHP
E36 M3 3.2 stock 208 RWHP
M42 powered e21 122RWHP
James (M42-technic) 0RWHP :)

Dyno was a ground mounted dynojet.

Eric, just face it...no matter what engine goes in your car the power is going to be down. It's a curse taht started with your M20 :) j/k

Good lock on getting this thing figured out (or doing the 2.8 swap)!

-prince

[EVOIIIM3]

It's hard to read that graph, but your numbers do not look that bad.

Is everything else working good? What shape are your plugs in? Is the air filter clean?

You can try an adjustable FPR, or get some nice Plasma coils. Also try some under drive pulleys.

How good was the gas?

Some times it hard to get good numbers, there are a lot of factors involved. If a stock S52 is at 208, and you are at 176, that I would say you should have about 10-15hp more. But I don't see how a 2.5 can do to much more then that unless you really tear into it.

[Jonathan M3]

Once you get some new valve springs your peak numbers should go up a bit since your hp curve hadn't peaked before the valves floated, probably worth about 5-7hp.

[Rob]

Considering AA got a 94 325i to dyno 176.8 HP and 164.1 ft-lbs with just their intake, exhaust, and software on a MUSTANG Dyno, I think my stuff should be much higher. That's the same power with more TQ and a better TQ curve.

grain of salt or two are highly recommended for those claims, or any tuner claims