I have a 91 civic with a sohc ZC swapped, running OB0.

First off this is a RACE CAR ONLY. It is strictly an oval track race car. Has cage/fully stripped of everything.

I need to know how to raise the rev limiter on it. I've searched and haven't came up with any answers on how to do this. Everyone says don't do it etc...well I need a few extra RPMS at the end of the straights to run 2nd gear. Although I won't be making any power up top, I need the power off the corners and shifting disrupts the car too much to do that.

So how can I up the Rev limiter on my car?

Thanks in advance!

Kyle

 

Though I am uncertain, I think you would just need to get an eBay chip or anything like that installed in your ECU. Hopefully someone else can chime in and correct me or further explain.

Any pics of your race car?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by RockinthEFhatch &raquo;</TD></TR><TR><TD CLASS="quote">Though I am uncertain, I think you would just need to get an eBay chip or anything like that installed in your ECU. Hopefully someone else can chime in and correct me or further explain.

Any pics of your race car?</TD></TR></TABLE>

That, and or, talk to http://xenocron.com

 

You probably need to chip it, but i would be careful with that... Once my 89 crx si went past the rev limiter in 3rd gear(i think its related to a vacuum leak) and the car was going over 90 in third. What was bad about it was the car instantly overheated, so im not sure if your car would overheat as well by upping the rev limiter.

 

Something I should have asked. What would be the most you would run the RPM too? I was thinking 8500 or 9k. Like I said it's a race car and I need the most out of second gear. If she blows up, she blows up, I got a spare motor in the garage.

Ofcourse I'd like to keep it from not blowing up, but what do you think is the highest you can go before you start to do some serious damage??


Thanks
Kyle

 

IM pretty sure u Lose power after 9k on a built dohc motor. Its probably not worth rasing the rev limiter on that car because u stop making power after so many rpms ne way. Just my .02. And it done mean its a race car cuz its gutted.

 

I'm not worried about losing powe up top.....what I really want/need is power off the corners and 3rd gear is simply too low to get any kind of power off of 2 and 4. By going with a higher rev limiter, I'm hoping the power I get off of 2 and 4 will help me more than the power I lose at the end.....

 

Thats a tough call, generally the rev limiter is there because any higher and you would start doing damage, the red line is where the car stops making power, have u considered using stronger internals? Your best bet would be a chip that raises the rev limiter and also adjusts the fuel ratio accordingly, at least if somebody thoguht that part out you might have a better chance of not killing your car.

 

get some dual valve springs in the head and a cam that makes power to 8,000 or so, gude has a few choices, this is off thier site for 88-91 sohc engines: PART NO: HCCS07
DESCRIPTION: Awesome power!
POWER BAND 4000 RPM. to 8200 RPM.
IDLE: Good
SPECIFICATIONS: Intake LIFT - .415 DURATION - 241
Exhaust LIFT - .421 DURATION - 228

PART NO: HCCS08
DESCRIPTION: "New team cam!" Awesome race cam. Requires BULLFROG ECU and headwork!
POWER BAND 5000 RPM. to 8500 RPM.
IDLE: Fair
SPECIFICATIONS: Intake LIFT - .428 DURATION - 242
Exhaust LIFT - .428 DURATION - 237

PART NO: HCCS09
DESCRIPTION: (GORILLA JR.) Pro Cam! Requires BULLFROG ECU
POWER BAND 5000 RPM. to 8600 RPM.
IDLE: Fair
SPECIFICATIONS: Intake LIFT - .409 DURATION - 261
Exhaust LIFT - .404 DURATION - 237

PART NO: HCCS10
DESCRIPTION: (GORILLA) Pro Cam! Recommended for carburators. Hot with NOS!
POWER BAND 5500 RPM. to 8300 RPM.
IDLE: Fair
SPECIFICATIONS: Intake LIFT - .428 DURATION - 283
Exhaust LIFT - .421 DURATION - 268