i have 86 crx si, can not find out what ecu i have, anybody know?
second, was woundering if it could be swapped for an other ecu say from 88-91 crx si or perhaps early model teg. any info would be helpful, thanks

 

ahh the 86-87 Si engine/ecu/ignition system. I'll reminisce. Ok basically any hopes of upgrading your ecu just went out the window. Why? because 84-87 civic/crx's use a vaccum advance type ignition system w/external coil. The ecu that controls that ignition system isn't reprogrammeable...unless you somehow find one of those rare *** Feel's chipped 84-87 PGMFi reprogrammed ecu's, which I'm sure you'll never find. (I've never found one!). And because of this vaccum advance style ignition system w/external coil, you cannot use any 88-91 ecu at all. The car will not run. I tried this back when i owned my 87 civic.

However, there is an option for you. You can use an 86-87 integra ECU if all you want is to have your redline increased. The 86-87 integra ecu redlines at about 7500rpm vs the 86-87 crx/civic Si ecu which cuts out at around 6500rpm.

 

thanks for the info, alot more than i could find. i don't know about that 6500 redline though, i have had a few pissed off moments in my rex before and rapped the tach around once or twice, maybe its not like others that won't let it go passed set rpm at all. one last guest, is the xternal coil upgradable to say msd, jacobs, ect.???? how bout msd box??????? is the teg(pg7) ecu give any better performance inprovement?


[Modified by 86CRXSi, 2:19 AM 6/13/2002]

 

well when i had my 87, I did run one of those MSD external coils...but after I think about it, I don't even know why I ran and MSD ext. coil....it didn't do anything for me. I eventually put the stock ext. coil back on. Actually, why do you want put an MSD on? you going turbo/supercharger/or nos? if not you dont need it.

The 86-87 teg ecu should show some slight gains...slight tho....besides a higher redline.

 

thanks for the info, really helped me out, same me money too. are the teg (86-87)
injectors also adaptable, inprovement????? also, kateman do you have any advice for me on a 1st gen rex??? right now would like to keep ew4, kinda peppy. thanks.


[Modified by 86CRXSi, 11:25 AM 6/13/2002]

 

I THINK.....don't quote me on this tho... an 86-89 integra tranny can be mounted to an 84-87 SOHC engine. If this does work, you'll need to use the 86-89 complete axles. The gear ratio on the integra tranny is way nicer (tighter) than the any of the EW SOHC trannys too.

A lightened flywheel is always a good upgrade...you'll get some snappy throttle repsonse once you add one of these.

 

i think trans is stock, it feels like it is geared tow low already. it runs 3000@60mph, 4000@80mph, 5000@100............and so.did i mention all in 5th.
also dosn't 1st gen have rev limiters? have been pissed off before and hit just under 8000rpm's, redlines at like6500???????????????

 

Katman, this is Roy in LR, I have a BAD problem with the spoon chip now...I'll send you an email and tell you what happened, I think I need another copy of the program I sent you....

 

have been over 6500rpm's quite a few times, like i said once to 8000............
thought it should cut out on me.

 

no....was pissed off realy bad bout constant overheating, so i stompped as hard as i could on the gas and watched the tach bounce off the "8"...............
fixed overheating.....................new radiator.

 

Here are my thoughts about the stuff covered above...

86-87 Teg ecu and injectors, which are bigger than the Si ones, make a noticable difference when combined with i/h/e.

I don't think the teg tranny bolts up to the CRX block. The way I heard to make it work is to use a wagon block, Si head, and teg tranny.

 

thanks for the info, think i will try the ecu and injectors. is there a grs, or better
version thouse years?? not real intrested in swapping trans, my gears too low already......are there anyother good upgrades for the ew4?? have found out most are homemade or borrowed stuff.


[Modified by 86CRXSi, 9:37 PM 6/14/2002]