225 WHP from an NA D-series motor

[apierce18]

Is 225 WHP Naturally Aspirated possible and with what motor combination? The local shops say that they have never seen over 175 with an NA D-series. I was planning for a turbo build, but if it is possible to reach my HP goal NA then that would be my preference.

[egcivic95]

ya its possible. but u are going to have c/r of 15.1 or something. if u want 225hp just boost that thing.

[apierce18]

the only thing about boosting is that it kicks you out of alot of classes of the SCCA and the NASA.

[SOHC_Rules]

in a tiny little hon-duh, 150whp n/a is more than enough. suspension should be your focus if you do autox or track racing..

[shifty35]

There is another thread floating around about hitting 200 whp with a ZC. Major themes seem to be...

1. Sleeve it, bore it out to 80mm+
2. > 15:1 compression, not on your life with pump gas =)
3. Massive cam and headwork
4. Race quality header
5. Carbs / ITB
6. Tune, tune, tune, tune
7. Retune
8. Tune some more

[SOHC_STUDENT]

Is 225 WHP Naturally Aspirated possible and with what motor combination? The local shops say that they have never seen over 175 with an NA D-series. I was planning for a turbo build, but if it is possible to reach my HP goal NA then that would be my preference.

no way.

/thread

[myHonda1]

the amount of money your gonna spend going n/a could build a motor and turbo it making WAY more power!

[weebeastie]

You can meet that power goal, but how fast do you really want your Honda to be? Power to weight ratio is the reason that a 150 whp crx hf will outrun a Mustang GT. Sure the Mustang makes more power, but weighs more than twice what the CRX or Civic does. 225 is attainable, but its not going to very streetable N/A. What are your goals for the car, not just a power number that sounds good, but how fast do you want it to go? Quarter mile/autox/?????

[K2e2vin]

Talk to Bisi. I think he was at around 250whp on his old carbed D15 or D16(street CRX). It was high compression; but ran on pump gas IIRC. I'm not sure how the low-end was though; I'm guessing it was a little difficult to drive around town though.

[builthatch]

in a tiny little hon-duh, 150whp n/a is more than enough. suspension should be your focus if you do autox or track racing..

exactly. worry about the trans and suspension if you want to road race. if you do happen to build something over say 170-180 whp, i'd be worried about durability. alot of the higher whp sohc's, like bisi's stuff, are for drag. this means very focused power bands, pulling a car that is next to nothing weightwise (less stress) and low engine running hours...

to the OP, i'm out of the loop i guess, but why have a p28 for a d16a1 as per your signature?

FTR, i've never seen a dyno graph for a NA sohc over whatever matt moreland's engine was, which i think was like 180ish and that was a mostly drag, some street (flexing mostly) setup. due to variables and dyno differences, that doesn't mean that someone's 170ish engine wasn't more, but i've never seen much over 160 for that matter, just a few.

*note- all these years and i've never seen a bisi dyno graph!

[apierce18]

about a 13 second 1/4 is what I was shooting for. The focus of my build will be toward braking and suspension. Would ZC cams get me going in the right direction or do i need something else?

[weebeastie]

Get the compression up, but the lack of cams is definitely going to hinder an N/A build. Don't know what else to tell you. Get the compression up and run race gas, but stock cams won't like that much compression.

[rushi]

to the OP, i'm out of the loop i guess, but why have a p28 for a d16a1 as per your signature?

Maybe his car has stock ODB1 wiring? And isn't P28 pretty much most versatile tuning-wise and has better resolution than OBD0 ECUs?

FTR, i've never seen a dyno graph for a NA sohc over whatever matt moreland's engine was, which i think was like 180ish and that was a mostly drag, some street (flexing mostly) setup.

http://www.jgenginedynamics.com/_dyno%20pdfs/D16Z6%20with%20pic.pdf
How about that, and it's said to be DD. That should be around 200whp.
IMO my +170whp engine is very smooth and great DD, it's only a bit jerky(only a tuning issue) at off-idle and flywheel could be too light for most of ppl.. And it's not powerful enough for my car, would love to have a lot more power 8)

[builthatch]

Maybe his car has stock ODB1 wiring? And isn't P28 pretty much most versatile tuning-wise and has better resolution than OBD0 ECUs?

well, previously, p06/p08 were way cheaper compared to p28, and worked just as well, esp for non-vtec engines. that's why i was curious why the p28...



http://www.jgenginedynamics.com/_dyno%20pdfs/D16Z6%20with%20pic.pdf
How about that, and it's said to be DD.
ha, how much is 100 octane a gallon? i'd love to drive that around all the time. nice setup tho.


IMO my +170whp engine is very smooth and great DD, it's only a bit jerky(only a tuning issue) at off-idle and flywheel could be too light for most of ppl..

most engines approaching 180 that i know of are very very high compression setups which = race fuel, and if they were to be using pump gas, it'd be pretty risky. the difference from 160 to 170 to 180 is great. then again aside from yours (i'm unaware of the dyno you tested on or it's compareable numbers to get a gauge on how that dyno reads) i've not seen any other streetish engines making over 170whp other than that one that you posted and the aforementioned matt moreland's z6, but like i said, matts was not a daily and was very high compression (13~:1).

[SOHCinWA]

D motors love high compression.. Although gas does get expensive. Compression is the D's friend when wanting to make power. But the more compression, the less streetable it becomes. And with more compression comes higher lift cams to make the engine perform at its peak. There is a trade off.

[apierce18]

What would be a good barely streetable cam, piston, and rod combination?