100hp per liter SAE from stock S14-B23 2.3

[Anri]

Gents,

For those who are interest. I want to share some data.


I decided to push a stock engine and see how much power S38-B35 can produce and find the limit. Okay okay not really a direct meaning that std just how it came from the factory. I will describe the Bolt-On parts I have installed and we will take it from there.

-Intake and exhaust custom grind profile based on the cyl head flow I have.( I work with grinder and I love the freedom of making any custom profile I want to try )
-long tube headers.
-I custom 3D printed velocity stacks.
-Hi flow exhaust system (S85 Catalyst converters but placed way behind the trans to reduced back pressure)
-Haltech Engine management. coil-on-plug
-Large plastic intake box, same as S14 CF.
Everything else is all bone stock

I will skip the details with numbers with the given parts above I upgraded.


The dyno I am using is Dyno-Jet. I have taken number of bone stock E34M5s and they show all 265rwhp+/-. Factory don't lie with HP US 3.6 M5 is rated 311SAE Crank HP. There are 2 ways to calculate the %. 311-265=46hp is how much loss we have. 46 divide by 311 = 0.147x100=14.79% drive train loss from factory. Or 311-14.7%=265. So the Dyno-Jet I am using has 14.7% drive train loses this is stone set. I have taken also number of E46M3s absolute stock with stock file and the power is right at 280-283rwhp. On the same exact dyno US E30M3 2.3 bone stock made 165rwhp.US S38-B35 makes 256 SAE Crank hp. On the same dyno one of my bone stock E24M6 makes 224rwhp.


Whit the S38-B35 3453cc I was able to pull 345 HP at the crank SAE or 345-14.7%=294rwhp. 345 hp crank is exact 100hp per liter. This comes to about 57.5hp per cylinder. S38 3.5 has 9:8CR, bore is 93.4mm and stroke is 84mm 144mm rods. (I will come back and try another cam timing setting and see if I can get few hp more)

So basically from std M6 rated at 256hp crank I gained 89crank HP. The reason of gaining that much power is the limitations it comes which are same as on the S14 since its sharing same components.

US S14 2.3 is basically S38 B35 -2 cylinders. 93.4mm bore 84mm stroke, valves are identical intake exhaust.

US S14 2.3 comes with 10.5CR (if memory serves me well) and that will add a bit more HP on the table compare to having 9:8CR as on S38-B35.

Both of these engines are very alike S14/S38-B35.


I am a firm believer that I will able to pull out 235hp-240hp with the same parts (I used in my S38B35) out of bone stock S14-B23 2.3 which is just right at 100hp per liter at the crank SAE.


On S14s S38s to achieve exact 100per liter one does not need to open the engine for complete bottom end and head work.

Regards,
Anri

[evommm]

Please keep me posted I love the idea
Mike

[Anri]

Please keep me posted I love the idea
Mike

Hi Mike,

Thanks for the positive support. I was not really sure if people would even be interest.

I am absolute confident and don't want to sound too much but I am sure 240hp SAE is absolute possible.

I am posting a link from the dyno on the S38 B35 https://www.youtube.com/watch?v=wiSsXF2-MVA At present I am changing 2 parts and will see if I can do hot passes at 300RWHP.

This is my track toy M6 with 3.5 when tuned it on OEM 1.3 Motronic. This engine never wanted to rev ever :( throttle response was absolute shit :( https://www.youtube.com/watch?v=e7nLYTqrtg8

This is after complete Haltech full upgrade I did. Throttle response from the Haltech and the tune was absolute day and night....I also re-timed the engine and added to the package different velocity stacks this all together made the engine dynamics like its not same engine....My engine has 260k miles on the bottom end stock pistons new rings, and cyl head valve job to ensure my 1% leak down at TDC tested on cold engine. https://www.youtube.com/watch?v=y5S6tIOoNGU

I reached the limit of the 3.5 3535cc it was making 305rhwp and after very big project with Haltech, re-timmed it, velocity stacks this together brought me about 6rwhp so I ended with 103.2hp per litre.

After the stacks and re-timed it the power curve stretched even further, before it will pull hard to 7200rpm and right after it will fall on its nose...Now the pick power is reached at the same rpm but it keeps it up to 7800rpm and even 7900rpm but with the stock 130grams wrist pins and boat anchor OEM cast pistons, and 675grams oem rods is not a clever idea but for the test its not a problem.

I will post a Dyno after I complete the S38-B35-S14 in a week or two I am going back to see if I can make 300 wheel on Hot Passes !

At present on a Cold Pass it makes 300rwhp but the the 3rd pass the power drops down to 294rwhp and stays there as a stone.

Fingers crossed will keep an update.

Regards,
Anri.

[RAD2LTR]

I don't see why a 2.3L couldn't make 100 hp/ liter. When I go through mine, that will be my goal. I have an Evo3 and and Evo 2 intake cam, as well as a possible motorsports cam (I got it dirt cheap and couldn't pass it up. I don't have any specs on it however.) The biggest restriction seems to be the AFM, and the small cams. I'd guess with a modified head, some cams, and the Alpha N setup, it would be pretty easy to see 230hp at the crank.

Will

[Anri]

I'd guess with a modified head

Hi Will,

Not sure if you read my goal. I have never ever modified the cylinder head its all stock.

Goal is min 100hp per liter, possibly 103hp per litre and this will be due to 0.7CR more.

Will shall see, may be 250hp crank.

[Crank]

Please keep us updated.

[Dave @nz]

Hi Anri,
You made a nice job of installing the Heltech on the M5, sounds very interesting what coils did you use and any other useful details thanks.

[JimK]

Hi Anri

Have you added a knock sensor with the Haltech installation?

[Anri]

Hi Anri

Have you added a knock sensor with the Haltech installation?

Hi Jim,

Not on the current stock engine I am working on to make the maximum HP from the bottom end, head ports, itb do offer. Also on pump 91 piss California gas I can do so much. The std 3.5 cr ratio is 9:8 so we reach max power way before knock.

I have special project coming which is a Must to have knock control.


Regards,
Anri

[Anri]

Hi,

I forgot to mentioned that at 294rwhp with the sequential set up I maxed out the Lucas S38-B38 3.8 280cc Injectors at 3 Bar at 6600rpm, engine is making power up to about ~7250

At present I updated the injectors with 4 pin hole at 360CC at 3 Bar and they operate at ~72-75%. If add another 5rwhp to keep 300 on hot passes then I should be in perhaps 80-85%.

We shall see next week.

Regards,
Anri

[nilsp]

Anri,

very interesting reading this stuff.. looking forward to more news

Regards,,
NilsP

[stevesingo]

Sound's like you are having fun.

Dyno losses are not a fixed % of a measured power. The greatest factor is road speed as the tyre roller interface is a greater consumer of power than the g.box, prop shaft, diff, driveshafts and their associated support bearings. I trust you are using the same gear, diff ratio and tyres for all E34 tests, and the tie down is the same. In such a case, expressing the loss as a % is not so wide of the mark. But, a different car will have a different loss at a given road speed and more so at a different road speed.

But, it is not stock.

-Intake and exhaust custom grind profile based on the cyl head flow I have.( I work with grinder and I love the freedom of making any custom profile I want to try )
-long tube headers.
-I custom 3D printed velocity stacks.
-Hi flow exhaust system (S85 Catalyst converters but placed way behind the trans to reduced back pressure)
-Haltech Engine management. coil-on-plug
-Large plastic intake box, same as S14 CF.

If we are talking external bolt ons, then a header and intake lengths tuned for peak power will help some, but probably kill torque somewhere else in the rev range.

FWIW, the Evo 2 engine comes the closest to 100bhp/lt DIN at 220hp from 2302cc. I'm pretty sure just a change of EMS to an A/N system would yield 100bhp/lt. On a pre '89 engine probably not as the intake cam is only 248deg.

What is the cam specs on the S38 engines?

[jimmy p.]

FWIW, the Evo 2 engine comes the closest to 100bhp/lt DIN at 220hp from 2302cc. I'm pretty sure just a change of EMS to an A/N system would yield 100bhp/lt. On a pre '89 engine probably not as the intake cam is only 248deg.

I agree w/ this 100%.
A good Alpha N intake setup on a genuine Evo 2 engine, w/ no cat exhaust, free flow muffler and a good dyno tune probably gets there pretty easy.

[1990m3]

I don't think 100hp / liter is a problem at all. My 2.3 race motor with the first overbore (like .001) made 250whp on a mustang dyno. I know dyno's are all over the place but that is clearly well over 100hp / liter regardless of how you calculate. It's a race motor with many non factory parts, but it makes it easily.

[jimmy p.]

I don't think 100hp / liter is a problem at all. My 2.3 race motor with the first overbore (like .001) made 250whp on a mustang dyno. I know dyno's are all over the place but that is clearly well over 100hp / liter regardless of how you calculate. It's a race motor with many non factory parts, but it makes it easily.

Oh yeah, once you get inside the motor, cams, pistons, porting its easy on an S14.