Hey guys im building a dirt race car. I have a 99 prelude h22a4 motor. And the rules is that vtec cars can't run. So i was wondering if there is a way i could take off the vtec solenoid. And what i could put in the spot off the solenoid?

 

youll be better off with 4th gen 92-96 prelude with H23 engine - its lighter than 5th gen and engine is ok for those rules

 

Yea i would like to do that. If i could find someone to buy mine. But i just thought there might be away i could just take off the vtec solenoid. if i cant sell it.

 

Hmmmm... this is NOT going to work like you think. First, Rosko Racing makes a block off plate to replace the VTEC solenoid assembly. This allows you to remove the VTEC assembly. The non-vtec lobes of the camshafts will only make power to about 5200 rpm and then dive off rapidly... and this is assuming that the ECU will allow you to rev the engine to redline when throwing codes for VTEC since they will be unplugged. The proper fix would be to pin the rocker arms together to lock the engine into VTEC all of the time and utilize a tuneable engine management solution like Hondata to tune the engine on the high cam full time. This will create a really choppy idle and the performance will be lacking below 4500 rpm or so... but it will run like a normal VTEC engine above that.

 

You would need to swap a non-vtec engine into it, and a correct ecu for that motor.
Pinning a vtec engine so that it stays in vtec all the time does not pass the rules for your type of racing. It has to be an actual non-vtec engine.

 

could i put a h23 head on it? Then put a non vtec computer in it or have it tuned. Then would i have to change the wireing harness or would it be ok? Is there a big difference between the h22 and h23 block?

 

i was also thinking about putting a h23 head on it. Would i have to change the wireing harness and computer or could i just get the computer tuned?

 

prelude ecu's are not tuneable. You would need an obd2a-obd1 conversion harness (ecu side only), and a tuneable ecu (all honda based tuneable ecu's are obd1).

Yes you can put an h23 head on an h22 block. It will have a little less torque than a complete h23 though due to the lower stroke. If you do this, you absolutely need to make sure you get the oil restrictor from an h23 block and install it in the h22 block. You'll also need the h23 distributor, and might need a conversion harness for the distributor. The exhaust manifold flange is different, so you'll need an h23 header or manifold. The intake manifold flange is also different, so you would need the h23 intake manifold as well. Might need the h23 throttlebody too.

Personally, I suggest just getting a complete h23 engine.

 

I guess I would have to see how the rule is worded before I conceded this point... RULES are black and white, and WINNING is in the GREY. VTEC is an electrical and mechanical system that transitions between camshaft profiles... removing the solenoid, pinning the rocker arms and tuning the engine for the high cam lobe only is no longer VTEC. For good measure, one might grind off the "VTEC" letters on the valve cover and wrinkle coat it again to remove the suggestion of what it once was...

 

What does rules say about ecu?

 

I don't know for sure with the OP's class, but most rules for his type of racing say the ecu needs to be from the same make and model of the chassis, without specifying year. Some just say need to be the same make, and don't specify model or year. On rare occasions, they say needs to be original to that exact chassis

 

OP Just should get than 4th gen Prelude with non vtec H23 and M2B4 transmission

 

Sounds like you are working within the Grey as well motoxxxman.

 

I haven't raced in those classes for several years now. I've started turning my car more towards drag lately. I was 100% within the rules at the time though, with the exception of occasionally breaking the decibel level while on the track. They always issued 1 warning though, so after that I would just ease off the throttle a hair when I was near the meter

 

H23a's are give away's almost. Surely you can find one for next to nothing, or trade for someone's H22 (and they give you some money).