What is the most powerful NA S2000 on Pump Gas
 

Hey guys I was wondering if anyone knows who has the most power naturally aspirated out of our motor with pump gas. I am in the middle of my build and before I got my head ported and my intake manifold expanded I was making 286 whp 231 ft lbs tq on 93 octane. shooting for over 300 in the next couple months and I thought it'd be awesome to have the most powerful NA on pump gas.

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Refer to this

https://www.s2ki.com/s2000/topic/107...p-f-series-na/

And by pump gas I'm referring to 93 octane and below. While e85 is found at pumps it's not readily available all over. While I know there's fluctuating dyno calibrations it will be nice to see some comparisons

There's a couple of racers pushing 290-300 in France, on pump fuel, 2.0L engines.

Do you know what they have to make 290-300 on a 2.0. Is that engine hp or whp? That seems really high for 93 octane for a 2.0

Urge's engine is making 375bhp on texas 93 pump. Their thread is in the N/A section somewhere

Bhp is crank right? That's still very impressive either way

it's my understanding N/A builds overseas(Japan) are going to produce higher numbers due to the higher quality fuel.

sucks for you CA 91 guys :p

Well I am getting my motor back from InlinePro on the 17th and have a tune scheduled at Evans tuning the 19th so I'm hoping for some better numbers. On 93 oct. Maybe next year I will do different cams and e85. For now I just wanna drive the damn thing!

That's crank, from an engine dyno so very accurate, they're endurance spec though, so they'll do a full season of endurance racing before a refresh, there's probably a bit more in there if they could use more rpms but reliability becomes an issue.

Well I got my tuning done last Thursday at Evan's Tuning by Jeff Evans. I was able to make 295.8 whp and 232 wtq on 93 octane. Might be able to squeeze a little bit more out of this street car with Inline Pro Stage 3 cams, Kinsler ITB's, a custom exhaust manifold and maybe switch to E85. I want to thank Jeff and Jeremy from Inline PRO for helping me make this build a reality to bring the rest of my car together.

Link to the dyno video

Wow nice numbers, and Jeff's dyno is pretty comparable and not inflated like Church's or something. You have a build thread or a parts list somewhere? Curious to see what it took to do this. I'm guessing high comp. and fully built engine?

I haven't made one yet but I will list here everything that I have currently.

Engine built and assembled by Jeremy at InlinePRO. Great guys over there and they do things right

Inline PRO Stage 3 Cylinder Head
BC Stage 2 NA Cams
Inline PRO 2.7L Stroker kit (90mm Bore 106mm Stroke)
Inline PRO Closed Deck Sleeves w/ Copper O ring
CP 12.5:1 Piston's
Carillo Rods
Injector Dynamics 1000 cc injectors
Walbro 255lph fuel pump
Hondata Intake Manifold Gasket
Custom Intake Manifold by Jeff Evan's of Evans Tuning
74mm throttle body
J's Tsuchinko intake
PLM Header and Test pipe
Invidia N1 Exhaust
Tuned on an AEM EMS Series 2

I think that covers it.

Plans for the future when im not BEYOND BROKE

Inline PRO Stage 3 cams
Custom Exhaust manifold (all ones available don't make any power and are designed for 2.0's not 2.7)
Kinsler ITB's
maybe eventually get a flex fuel sensor and do an E85 tune. But then I am pretty much maxed on on power since I cannot do forced induction anymore with such small cylinder walls. It will probably blow head gaskets none stop.

Also I plan on doing a tune on another local dyno shop to show what the current setup produces on maybe an inflated dyno.

Consensus I really like it i just pulls and pulls. I haven't had many chances to drive it so I have nothing to compare it to.

Do you know what size injectors they are using?

I'm not certain, I can find out though, I do know they're running twin sets.

Stock S2k injectors and a set of 206 RC's injecting into the bellmouths - not sure what the size is on the latter as I didn't ask, but I'm sure google will find 'em.

Interesting setup!

I'm over 300 crank hp, but that's a 2.2 with a very high spec and 9200 redline.

https://www.s2ki.com/s2000/topic/961851-my-f24/


309 WHEEL hp

That's with 100 octane? What does it make on 93?

Octane is measured differently in europe

100 octane there is ~94 in north america

Oh ok so barely better than 93. That's really good. The kinsler itbs must have helped a lot as well as inline pros stage 3 cam. How's drivability with the itbs?

100 octane here is actually more like 96 in the US, or just shy.

Europe USA
95 = 87
97 = 89
99 = 91
101 = 93

the itbs are jenvey..i think that kinsler will be better for top power.the cams yes are very hepfull but i had dyno the bc stage 2 and there was not too much diffrent.. i have no problem with itbs .now i have make and a custom plenum.they work perfect.

No, what you have there is RON vs MON, the USA uses PON, which is the average of RON+MON.
So it goes

95 = 91
97 = 93
99 = 95
101 = 97

Give or take a little.

101+93=194. 194/2=97

i m comfused.i dont know how to calculate it. i just google it..

If I am understanding this correctly there are three different types of ratings. RON (Research Octane Number), MON (Motor Octane Number), and AKI (Anti-Knock Index) also known as PON (Pump Octane Number).

The rating used in Europe is RON and that would be the following values you provided

95
97
99
101

The rating that shows how fuel behaves when under load is the MON and are the following corresponding values

87
89
91
93

The rating for USA gas is AKI also known as PON and is determined by taking RON+MON and then dividing them by 2 and are shown below.

95 + 87 = 182 182 / 2 = 91
97 + 89 = 186 186 / 2 = 93
99 + 91 = 190 190 / 2 = 95
101 + 93 = 194 194 / 2 = 97

So in conclusion your 100 oct in euro would be closer to a 96 octane equivalent in the USA and if you did your dyno using a 97 it would be like our 93. Either way doesn't really matter because unless all cars all done on the exact same dyno/weather conditions (temperture and humidity and elevation)/tuner there's now 100% way to compare.

Did you notice a powerloss making a manifold for your ITB's?

thanks for all that help..
the car has the same power when it's cold and when it's warm...
the air/fuel it's the same exept low speed that I think that I lost a very small ammount of power.. the a/f was 13,2:1 and made 12,9:1 -13,1:1. 3000-5000 rpm