86 CRX HF vs Si

[justblackwell]

Other than engine components, how much stuff listed in parts catalogs for the si will fit my hf? I want to know about suspension and brake upgrades specifically. Also, I want to build a d15a2 instead of swapping to a b series. Where can i find performance parts for these d series engines.

[lxndr]

Everything for the suspension will swap over. I'd keep the aluminum rear drums and just swap the front discs from an '86-'89 Integra and use '88-'91 Civic/CRX front calipers.

The first thing you should do is add a rear sway bar since the HF never came with one. Try to pick up an OPM or Lightspeed swaybar, the Suspension Techniques sway bar is OK, but it's more of a helper bar. Keep the stock front sway bar.

Building a D15A2 will be a challenge since there are hardly any aftermarket parts left for this motor. The best thing to do is add a header (still available), dual carbs, port the head, regrind the cam and rebuild the block. The block can also be bored out to accept 1.6L D16A1 Integra pistons. You should also consider swapping in an SI tranny since th HF tranny is geared for fuel economy and the SI is geared for speed. Check out www.redpepperracing.com for more info.

[justblackwell]

Thanks, I appreciate it. The one thing I am still looking for is an aftermarket intake manifold. Any ideas?

[lxndr]

Ask around on RPR (lnk provided above). TWM once made a dual carb manifold but the chances are slim that you will find one. The best option might be to modify your stock intake manifold.

[pimpmcdaddies]

And if the engine is modified will the standard (SI) fuel injection system be able to cope with demand?

[lxndr]

Originally Posted by pimpmcdaddies

And if the engine is modified will the standard (SI) fuel injection system be able to cope with demand?

For a fuel injected motor all you'll really need in addition to any mods is a fuel pressure regulator and fuel pressure gauge (and an air/fuel meter for tuning). You don't need bigger injectors, you just need to increase the fuel pressure a little to keep up with the increased air flow. The ECU will not have any problems with a modified motor unless you go turbo.

[btec88]

also if you can find a computer from an 86 or 87 intergra than will help out alot with better fuel maps

[lxndr]

Originally Posted by btec88

also if you can find a computer from an 86 or 87 intergra than will help out alot with better fuel maps

An Hf does not use a computer since it is carbureted (well, it uses a small one for emissions).

The Teg ECU does nothing for performance in a stock SI. I know, I tried. http://www.automotiveforums.com/vbul...d.php?t=199192

[btec88]

I was speaking in terms of ecu keeping up with modification. The computer raises the fuel cut and has a fatter fuel curve. So if you have changed the breathing capacity of the engine the ecu from said Integra will help. Using an 88 or 89 Integra ecu in my 90 that I have opened up a little and it helps, maybe not all that noticeable untill you run against a known factor, dragstrip, consistant car, dyno. It also raised the fuel cut to 7500 (approx). Stock fuel cut is 7000 (approx). Also with the 90 it also changes the ignition curve since that is controlled byt the ecu, the 85-87 ignition is mechanical, hence needing the 86 87 Integra ecu, wich is also a mechanical advance. By the way I am looking for 86/87 ecu, anybody have one?