Does anyone know where the 10HP difference (130-140) comes from on the 2G integras? The 90-92 have 130HP but the 93 get 140HP. Just want to see how hard it would be to bring an older integra up to 140HP under the IT update/backdate rules.

 

Thinking about this again, the easiest (and perhaps only legal) way to do this is to swap the entire engine. Remember that the up- and back-date rule requires the shifting of complete assemblies. You could not, for example, take the cams or pistons out of a '93 and poke them into a '90. This was done to prevent Frankenmotors, where mixing parts can result in dramatically higher compression ratios, for example. If the difference is in the brain, you can swap that as an assembly, I would think.

What I do NOT know is if the engine is actually faster, in addition to having a bigger number associated with it. Someone out there should know.

One good ITA strand dies, may another take its place!

Kirk

 

Raised rpm for horsepower figure, from 130 @ 6000 to 140 @ 6300 - so probably changed the cams a little and/or redid the timing and fuel mapping after discovering the motor actually could take 10 additional hp reliably . If you look at the torque curve both the 90-91 and 92-93 make 121 lb/ft, the 92-93 just make it at 5,200rpm instead of 5,000 rpm. Also slightly better intake flow I believe.



[Modified by Vracer111, 9:04 AM 7/31/2002]

 

That's pretty much it. Slightly more agressive cams and a little better airflow(intake mani and. exhaust mani.), not sure aobut the fuel mapping though...I'll have to look into that.

 

The changes that gave the extra 10 bhp were intake cam ( I have the core numbers somewhere ) and an improved ex. manifold whitch does not mater as headers are free, and some improved mapping in the obd1, whitch does not matter as you can chip the ecu. The 93-94 cams are probably worth only about 4 bhp on ther own, a full blueprint,IT port work, .5 compression increase, and oil windage control produce the other 20.

 

Thinking about this again, the easiest (and perhaps only legal) way to do this is to swap the entire engine. Remember that the up- and back-date rule requires the shifting of complete assemblies. You could not, for example, take the cams or pistons out of a '93 and poke them into a '90. This was done to prevent Frankenmotors, where mixing parts can result in dramatically higher compression ratios, for example. If the difference is in the brain, you can swap that as an assembly, I would think
-------------------------------------------------------

If it the same (engine designation) per honda would this rule still apply? I thought that all of the ITS RX7s were bastardized. I guess maybe they are and it's just not legal. Guess I better read my GCR again. Thanks for the responses.

 

It's my understanding that the wiring harness is also different between the 90-91 and the 92-93. I'll be making a swap later this winter if I can raise the money...

Greg

 

Not 100% sure, but I think it's just the cams that are different between 90-91 and 92-93. Ex/intake mani are a little different in the b18B (94+).

Can anyone comment on this. If the code on the head and block are the same (I don't know if they are) and a 90 motor with 92 cams conformed exactly to 92 specs (including codes, if it is indeed the case) could it then be considered a complete swap?

 

The engine designation has nothing to do with it. The part numbers/castings are what matters. If they happen to be the same thing, then life is a bit easier, but that rarely is the case.

The only legal way to update/backdate is by component. That said, if the difference is the cam (ie casting number for block and head are the same), then swapping the cam has the same effect as swapping the whole engine. But you better make damn sure the block and head are identical between the years in question. If the intake manifold is different as well, then it would have to be installed along with the appropriate year cam.

As for the RX-7s - I believe the rotor housings and endplates are the same (equivalent to block and head). The rotors were higher compression in 89+ - so by putting 89+ rotors in a 88- motor, you have essentially built a 89+ motor. The only other difference I am aware of is the counterweights on the flywheel - those would have to installed with the corresponding year rotors. Of course, there were ECU changes as well, but that is a seperate component and could be swapped on its own.

 

The engine harness for the 90-91 and 92-93 are different because of the OBD-1 for the later and non-obd for the early car. If you use your original injectors and distributor, the harness can be used on either car.

Good luck

 

hey, how about a separate head tuned for each track..... completely legal!

i know a person who had 3 trannies with separate FD for 3 different tracks we run in our region... swapped em in 30 mins.

 

86-89 integras 1.6 dohc 130 hp non obd ecu fits into 88-91 civics for sohc for much improved fuel maps and timing

90-93 1.8 dohc 140 hp rated

 

The 90-91 1.8L Integras were rated at 130hp. I know, I had one.

 

I still have one.

 

IM StorminMatt - he is the master of all B-series engines, codes, electronics and swaps...