I am swapping out my DX engine for another DX engine that's in better condition, just until I have some money for a bigger swap... I am thinking about doing the MPFI swap and adding some bolt ons. Is it worth the money? I've heard the engines have pretty high compression. Right?

 

don't bother modding a D15 unless you plan on doing it all out. all out meaning, pistons, rods, higher compression, higher octane gas, etc etc etc...Otherwise, a I/h/E D15 is about as fast as your grandma with her stroller in a 40 yard dash against carl lewis.

 

hahaha.......yah save your money for a b series swap

 

The fastest SOHC in the world is a D15B, at least the block is. It's a crx hf with a D15B block, D16Z6 head that's turbo nitrous. I think it runs low 10s, but I'm not sure. So yeah a D15B can be fast, but it depends on what your going to do.


[Modified by asnx6pac, 2:55 PM 1/21/2002]

 

You can do anything you want if you have the $$$

 

if you want to stick a 1.5 then:

-92-5 d15b (DX version not the 8 vavle CX), already has a MPFI, some mods are required, such as swapping driver side mount, change out the 90-1 si cam and gain even more power

on stock DX the MPFI mod, is one of the best for the money (get a 92-5 manifold si/ex (but need to use the TB as well from it), and 88-91 injectors
next get some 92-5 si/ex exhaust manifold (4-2-1 type not the crappy 4-1), use 90-1 Si ECU or ZC or even 88-9 Teg and of course do the 90-1 si cam again

 

eg6ajk,

What is done to your D15B to make 117whp/100trq?

 

Well I do have alot of extra Si parts lying around, so I think I am gonna throw on the MPFI, Si Cam & , Teg ECU, B18a Injectors, Maybe an adjustable Cam gear, and some basic bolt on's. How much HP do you think those would add.

 

100-110 flywheel hp

 

That little... hmmm.. that's not to good. I mean stock is 92hp right?

 

yeah but the si motor is only 108..
and youre not using the 1.6 crank and the b18 injectors are the same as the si..
it should pull a little harder than an si in the higher rpms but the wider gears pretty much would cancel that out imo.

 

its just stock JDM d15b (basically d15b bottom end + d16z6 head), with just one of ecu programs and exhaust

new dyno soon this time with a different header, Zex cam and maybe an intake
who knows maybe a 125-130whp can be achived.

as far as the second combo i quoted its imilar to Mista bones combo which putout 118whp and 102lb of torque to the wheels, with just I/E/H, so there is still potential with the D15B

 

fast enough to run 11.20s allmotor

and then that weird JDM d15b (vtec motor ) makes same HP as the dohc ZC...


but yeah... 16 valve d15b can go really really fast

 

I've been in eg6ajk's D15 Hatch...this is b4 he put in the zex cam...and man it felt as strong as my stock b16!

 

he tinkers with his ECU..!

 

Well I think I'm gonna throw on my MPFI off an old 89 Si engine and I also got a ZC Exhaust manifold that I think I'll throw on.

 

Dont waste your time.. Its a full race motor and wouldnt be surprised if that motor cost $20,000 to build.


[Modified by CRX_VTEC, 8:50 PM 1/21/2002]

 

I am guessing my d15b2 with Z6 head is around mid 13's @ 8psi... It's pretty similar to my ZC turbo @ 6 psi and it ran 13.5... Just put the head on last night



Jeff

 

can be a very fast engine!, just need a lot of mods!!' it's basically the same block as all that 1.6 sohc engine, so plan to get a d16z6 head, good pistons would be a great thing and plan on having you head ported and polished. then after having a good base, put on a header, CAI, nitrous, turbos, etc etc etc, ( a list as long as ¼ mile track can be put here) then you will be in good shape.
I'm all SOHC' these are good engine, really though!!,
good luck !!
see ya

 

well not really slow my d15b1 yes the std motor will take a new si 99 on up stock on sunday as long as wheather permits im gonna attempt to get to the track and the dyno will be there
the d15 internalls are also lighter and smaller than teh d16 so less rotational mass there for possibly more hp im not saying its better than a b16 but its worth the $5 i spent for all the parts

 

yeah and the guy who built the fastest D15 is also a Chemical Engineer.

that is why it runs good.

 

the 11 sec crx guy's name is bizi ezeriaho (not sure on the spelling) his motor was built by r&d it is no longer a 1.5 its stroked and bored and i think its displacement is more like 2.0 now. it was covered in a back issue of scc. if u do a search a few of us have got in contact with them (r&d). i was quoted a price of 1600 dollars for a stroker kit (crank, rods and pistons) for the d16's this would bring displacement up to a 1.8 liter and he said it was dyno'd to make around 140-150 hp at the wheels with a stock head and cam (can't remember exactly but i think this was for a non-vtec since i was talking to him about building the y7 up) i think those are pretty respectable numbers considering it was with a stock head and cam. Can't remember the c/r either. oh yeah they also built the motor for l'natural.


[Modified by sohc_boy, 8:36 AM 1/22/2002]

 

after i did the mpfi swap on my crx back in the day i tuned it to a 15.7 in the 1/4 on street tires. i am going to build a d15b soon with zc pistons non vtec 98 head and 98 ex intake manifold. this will be my road race car. i have seen some fast d15s. n/a and f/i. what is your goal for your car a drag/street car or a auto x/road racer? and yes the b18 and d16 injectors are the same. they are both 240cc. the lud vtec injectors are 260cc. use them. and use 96+ exhaust manifold if posible. it is a tubuler desighn. then get a si/zc tranny. and you should be set.

 

FYI, the only class you will be able to run withe the newer head and intake manifold for SCCA is GT3 .... trust me, I already looked into this after I did a 2000 DX head swap withe an '89 Si intake manifold and ECU ...... you cannot alter the intake manifold in any class EXCEPT GT for the STD or DX hatch .......

And if you are running NASA Honda Challenge, the MPFI swap automatically puts you in H1 (Hybrid class).

Hence the reason I said f--k it, and don't plan on building my daily driver for club racing anymore.

 

his motor isnt a 2.0 ... his new motor is 1530 cc.... and stroking a single cam is useless....
and they? built lnaturals.. ive heard 1 person built his motor... not a team effort

edit: R&D didnt build that guys motor... the magazine just said that .... dont believe most crap in magazines... specially HP numbers he


[Modified by IM ALL SHO, 3:00 AM 1/23/2002]