changing gears in tranny

I have a 1990 honda civic si with a 5 speed tranny and race it on a 1/3 mile oval.I can stay with most cars but just dont have enough off the
corners to pass I need about 10 mph more. I was told I could change third gear to get that pop. I dont want to spend a lot but will do what it takes

Yes! most definately! I love cirtuit racing and what i've learned from the pros is that gear ratios must but changed according to the track. if there are alot of hair pin turns you'll need a close ratio to for more acceleration. Suspension is one of the most important set ups as well. There are five factors that determine a race win 1. tranny gears 2. suspension set up 3. down force 4. tires 5. weight.
Tires and down force will help you kill the competion
You'll corner faster and compete better when all these factors work together

But if you really need 10 mph extra here how all you need is tape. Heres how , connected to your fuel rail is the fuel reculator (whether there stock or after market) on it is a vacum hose. If you disconnect the hose from the regulator your boost pressure will go up 10psi. But you have tape up the end of the hose or you'll idle funny. The hose could hang and all of this will not harm your motor its just extra fuel. Ive done it and let me tell you it works. PLEASE LET ME KNOW IF THIS TRICK WORKED FOR YOU AT YOUR RACE, SEND ME A PRIVATE POST! :)

PLEASE! :disappoin This guy is talking about OVAL track racing. He wants a little more power coming off the corners so he needs a little more RPM to be able to beat out some other cars. The way to do this is to change gear ratio slightly. Your five factors that determine a race win are pretty far off. You know what wins a race on a road course? The driver. I don't know what you are thinking with this stuff about taping over the vacuum line and what not to raise the fuel pressure, but upping fuel pressure will NOT help a stock engine. We are trying to get away from giving out bad information around here, not add to it.


To the original poster. What size tires and wheels are you running? A shorter tire/wheel combo will change your gear ratio slightly and maybe help you get these cars off the corner like you want to. Otherwise you might be able to swap to a different d series transmission but you will have to get more info on that as I dont know too much about the 4th gen Civics.

I guess your the time to try and pick on newbies.

I guess your the time to try and pick on newbies. I YOU READ AGAIN YOU'LL THAT I SAID what i've learned from the pros is that gear ratios must but changed according to the track And everyone knows its the driver who wins the race not the car, thats why I said these factors will HELP ( key word ) YOU COMPETE ( another key word ) BETTER. Maybe you should read it again and think next time. I dont make up any of this info. I'm no newbie in racing.
As for the oval track racer, yes like I said "what i've learned from the pros is that gear ratios must but changed according to the track"
Those five factors are for racing in general, I dont care if your a good racer cuz theres always a racer next to you with just as much talent, but by setting up your according to the track conditions will always greatly increase your chances of winning.
As far as the regulator trick is concerned, plugging the vacumm hose does nothing its just keeps the engine breathing through the throttlebodie and not both the throttlebody and the open vacumm hose (which causes a wierd idle) the little hp gain comes from the add fuel by increasing fuel pressure (removing the hose from the regulator)

Mr miataracer with a civic (?) you should try it or at least know if it works before you make your comments or become a critic, but I accept your concern about stupid info in the forum, but he said he didn't wan't to spend a whole lot of money, hence weight and suspension ( if he has adjustible struts/shocks) will help in that area. A stock settings are useless for that racer trying the shave off .10 sec on time slips

Ghost, shut up.. In no way at all did you help with answering this guys question about gearing, and your ghetto fuel pressure ideas are just plain stupid.

bobga, I've never heard of anybody changing out one gear in a d-series Honda tranny before. I know of some websites selling aftermarket trannies which are stronger and some are adjustable, but they cost $4,000 and up, and that's just for a B and H series transmission.

Do the 90 Si's have the same tranny as a 96-00 EX, or DX? If it has the same as a DX, the gears are much longer and I would make the swap to an EX (yes it will fit, I've done it before).

Ive never said anything about changing one gear, Ive too switched the SI tranny and ditched the stock dx tranny in my old 89 hatch, But the fuel trick is ghetto, out of a hayes book, it caught my eyes, so i had to try. It said something like (ex. 30-40psi w/ vacumm hose, and 40-50 psi w/ out it), But changing gears (it as in more than one) will solve the problem but I say go with SI

PLEASE! :disappoin This guy is talking about OVAL track racing. He wants a little more power coming off the corners so he needs a little more RPM to be able to beat out some other cars. The way to do this is to change gear ratio slightly. Your five factors that determine a race win are pretty far off. You know what wins a race on a road course? The driver. I don't know what you are thinking with this stuff about taping over the vacuum line and what not to raise the fuel pressure, but upping fuel pressure will NOT help a stock engine. We are trying to get away from giving out bad information around here, not add to it.


To the original poster. What size tires and wheels are you running? A shorter tire/wheel combo will change your gear ratio slightly and maybe help you get these cars off the corner like you want to. Otherwise you might be able to swap to a different d series transmission but you will have to get more info on that as I dont know too much about the 4th gen Civics.

I run 13 in tires and have no problem in the corners I can pass there and before, as I dont have to let off.As soon as I hit the stright they can go by me till the next corner,We are stock but I know some arnt.I my have to do more to stay with them like the heads and what ever thanks for the replys

I guess your the time to try and pick on newbies. I YOU READ AGAIN YOU'LL THAT I SAID what i've learned from the pros is that gear ratios must but changed according to the track And everyone knows its the driver who wins the race not the car, thats why I said these factors will HELP ( key word ) YOU COMPETE ( another key word ) BETTER. Maybe you should read it again and think next time. I dont make up any of this info. I'm no newbie in racing.
As for the oval track racer, yes like I said "what i've learned from the pros is that gear ratios must but changed according to the track"
Those five factors are for racing in general, I dont care if your a good racer cuz theres always a racer next to you with just as much talent, but by setting up your according to the track conditions will always greatly increase your chances of winning.
As far as the regulator trick is concerned, plugging the vacumm hose does nothing its just keeps the engine breathing through the throttlebodie and not both the throttlebody and the open vacumm hose (which causes a wierd idle) the little hp gain comes from the add fuel by increasing fuel pressure (removing the hose from the regulator)

Mr miataracer with a civic (?) you should try it or at least know if it works before you make your comments or become a critic, but I accept your concern about stupid info in the forum, but he said he didn't wan't to spend a whole lot of money, hence weight and suspension ( if he has adjustible struts/shocks) will help in that area. A stock settings are useless for that racer trying the shave off .10 sec on time slips


Let me say this my civic already runs a bad idle and as far as money I can handle a couple thousand to make it compete

I guess your the time to try and pick on newbies. I YOU READ AGAIN YOU'LL THAT I SAID what i've learned from the pros is that gear ratios must but changed according to the track And everyone knows its the driver who wins the race not the car, thats why I said these factors will HELP ( key word ) YOU COMPETE ( another key word ) BETTER. Maybe you should read it again and think next time. I dont make up any of this info. I'm no newbie in racing.
As for the oval track racer, yes like I said "what i've learned from the pros is that gear ratios must but changed according to the track"
Those five factors are for racing in general, I dont care if your a good racer cuz theres always a racer next to you with just as much talent, but by setting up your according to the track conditions will always greatly increase your chances of winning.
As far as the regulator trick is concerned, plugging the vacumm hose does nothing its just keeps the engine breathing through the throttlebodie and not both the throttlebody and the open vacumm hose (which causes a wierd idle) the little hp gain comes from the add fuel by increasing fuel pressure (removing the hose from the regulator)

Mr miataracer with a civic (?) you should try it or at least know if it works before you make your comments or become a critic, but I accept your concern about stupid info in the forum, but he said he didn't wan't to spend a whole lot of money, hence weight and suspension ( if he has adjustible struts/shocks) will help in that area. A stock settings are useless for that racer trying the shave off .10 sec on time slips

You make me giggle.

hey you running a short course i would check out effinmotorsports they sell a tranny with gears 1-4 from a zc and a 5 and final drive from the si for 700 that includeds the core price so you could get it for less. anyways its about as short as your getting for the price. this along with the small rim and tires should do you pretty good later

if your engine is idling rough, time to check your plugs rotor/cap, and wires. also check out fuel filter, and clean out your throttle body, air cleaner, and stick a bottle of seafoam in your gastank to clean the injectors.