stock d16a6 5spd in an ef sedan. when i say stock i really mean stock, even down to the air intake box.

i know the motor now is at 108hp and im looking to get up in the 120's somewhere. any ideas? or what would be a good start point?

NOT doing a mini-me!

 

The first thing to do is get the proper bolt on parts. Find the right combination of parts that will help the engine system flow better. Bigger than stock exhaust piping, no Kinks, good free flowing muffler(not necessarily the loud ones). A good basic header will free up some power. Once you do the basic intake, header and exhaust, look into the internals of the engine. The easiest to do would be upgrading to a more aggressive camshaft than the stock one. To get the most out of the cam, install it with a cam gear to adjust the cam for optimum performance.
As far as Camshaft choices, we have several to choose from. A mild street cam to all out race cam. Like our Stage 2, SR909 A6 camshaft, it retains stock idle, and can be used with stock valvetrain. Good for what you are trying to achieve.

Those basic parts plus the cam, will get you a good 15-20hp gain over stock. Good enough to make the A6 a little more powerful for everyday driving.

Any other questions in detail, feel free to email us at sales@exospeed.com

 

with the mods that ExospeedAMcrx just mentioned if you still have your a/c you could remove it and free up some horsepower and reduce some weight as well

 

It is possible to reach 120hp to the wheels quite easily.

Good intake. Well designed headers. Free flowing exhaust or a dump(not advised for the street). Factory engine rebuild(oversized pistons). Clean up head and port match intake and exhaust. Tune engine using some sort of engine management system(most important). Ditch the unnecessaries(p/s, a/c)

Done in Honda Challenge H4 class.

 

yes 120hp to the wheels is nothing. We used to do alot of Circle Track D16A6 race motors for a couple series in Idaho, North Carolina and here in SoCal. They were very limited on what they could do, but we were able to get 118-121hp to the wheels without porting, same pistons, stock camshafts, even on a stock airbox.

Streetable Camshafts itself can do 8-12hp to the wheels gain on its own.

 

wow this is the type of response i could only hope for. normally on this thread i would have gotten this answer..."swap to a B series" or "go DOHC" or "skunk2 lugs 5hp each one".

its nice to have a sponsor that wont bullshit with people. i will definitely good into this stuff as those are easy mods. the only expensive one, well MOST expensive will be either the camshaft or the exhaust.

 

I've been there done that you know. Been in your shoes in the past. Best thing we can do is share an experience and you can decide on your own what is best for you. Take the information and find out yourself if that is the route you are wanting to go with.

Here's another post I did on a recent thread in a diff part of HT. Just to show the capability of the D16A6 engine.

"You can make good power with a good flowing D16A6 head. Of course a good combination of parts will make a great difference overall. But in my opinion, with experience of over 12 years with the D16 engines, the Head and cam is the most significant part on making these single cam engines work.

If you're doing it on your own, just dont over work the ports where its just way too much. If you've never done this before, its better to do less than to do TOO much.

Just to show the potential of the D16A6. This is a dyno # of a friend of mine that is using our Exospeed Stage 3 Cyl Head, Exospeed Stage 4 A6 cam, P29 Pistons, SKunk2 Int Manif, ITR Throttle Body, tuned by Church Auto Testing with a Hondata.

 

after reading some of that, i see that this was a dyno on an EG...that d16 would have been stock and obd1....im running d16a6 out of a 89-91 si hatch which is obd0.

also what do you mean "exospeed stage 3 cylinder head". are you saying you MAKE the heads or you port and polish them to a certain spec which u call "stage 3"? everything else is self explainatory and awesome i might add.

but to be honest, if im going to be spending near 1000$ on souping up a SOHC, i may as well just get a base b16a1, tranny, axles and do a swap. if i piece it together i could do it for maybe 1500$

 

Our Exospeed Stage 3 Cyl head is the works, meaning its the full competition port work, Supertech Valvetrain and Valves. We do the porting on our heads in house.

and that dyno above was on a D16/ZC SOHC Non-VTEC engine like the one in your 88-91 Civic. Its just on a diff chassis.

If you are doing any extensive upgrading on the Motor, I suggest changing up to an OBD1 setup, which you can do on the EF chassis. Just have to get a 92-95 DX computer and Distributor and of course the wiring.

As far as the $, no matter what engine you plan to do, its going to cost money. Some people just want to do up an SOHC and some dont. Its all preference.

I myself grew up in your area, Riverside and was racing my ol D16a6 out there in the 90s. Thats where I did alot of the Trial and Errors of the D16 and coming out with our own A6 camshafts and combinations. Honestly, most of the ones we were beating with the D16s were the B16 swapped Civics.

 

P29 pistons...are those stock honda pistons or aftermarket?

an ITR TB is a direct bolt on to a skunk2 D series IM? what MM?

 

ITR TB is 62mm I believe. Its slightly bigger than a D16 skunk2 IM, but you can match port that to make it even.

P29 pistons are stock 89 Integra pistons. gets you about 12:1 Thats all I can say, but to really get the HP that we get, I cant give that away for free.

 

alright looks like a P06 ecu and dizzy. i can just get an obd0-1 conversion harness and re-pin the dizzy connector. im not about to screw with the engine bay harness.

 

assuming you bore out the block? is your porting and polishing expensive? well, i mean can you ballpark the price say if i wanted to get my blocked bored to match p29 pistons along with the stage 3 head?

what would that ROUGHLY cost me if i brought the motor in myself already taken out of the car.