So I have a 1994 Honda Civic lx sedan. Stock D15b7. Ok so I've had the car for about a year and a half now. And i've been slowly fixing it from a wreck I had a while back. Mainly suspenion and a bumper conversion from stock a stock bumper to a coupe/eg hatch bumper. And just recently the car just started redlineing at a freaky 6800-7000 rpms. Now just a couple of weeks ago the car used to redline at about 5900-6100 rpm. Does anybody have any idea where this new hidden power might have come from???

 

your tach could be off...but that motor should go above 6100 no problem

 

my friend had that motor in his CRX for a short period of time and was revving it to 7,000 rpm's.

 

why again are you revving a ******* d15b7 up that far?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by fitbmx86 &raquo;</TD></TR><TR><TD CLASS="quote">why again are you revving a ******* d15b7 up that far?</TD></TR></TABLE>

Limiter is like 7000?

 

go higher rpm does not mean its reaching its max hp output..u have to rev it to its max hp output rpm..in your case..your tech might have broken or so..d15 stock engine is 102HP @ 5900 rpm , 98 ft-lbs. @5000 rpm...after 5900 rpm..hp comes down and burn more wasteful fuel

 

So pretty much the tack is either broken. Or my car is just a freak right???

 

my stock d15b7 revvs out at 7 grand.. hits the rev limtor. but starts hitting the powerband around 4500 Rpms and drops off at 5500 rpms.. or starts to feel like its droppin off.. 7 grand is normal revs..

 

i don't understand the question
seeing the redline is a physical LINE on the tach, how can this line move?

are you talking about the rev limiter?

 

the OP was saying that his car revved out at 5900-6100- RPMS then it suddenly started hitting the limitor at the stock 7 grand..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by crazyguy &raquo;</TD></TR><TR><TD CLASS="quote">go higher rpm does not mean its reaching its max hp output..u have to rev it to its max hp output rpm..in your case..your tech might have broken or so..d15 stock engine is 102HP @ 5900 rpm , 98 ft-lbs. @5000 rpm...after 5900 rpm..hp comes down and burn more wasteful fuel</TD></TR></TABLE>

what? I hate when people say that. You might make your peak power at 5900 ...but if you shift at 5900, you will bog the HELL out of the next gear. Even a "sporty" trans like an Si (z6) trans will put your RPMs right back at around 5800 or so after you shift at redline (7500 for a z6). This means that even if you do shift all the way at 7k in a d15b7, the trans STILL puts you back down way far out of the power band. I'm assuming you have a DX trans still attached to this motor.

Anyway...the reason to shift at redline is because it takes less time to just rev out the low gear (even if you're not making peak power) than having to wait for the higher gear to rev back up and get back into the power band just to have you shift again. really the only exceptions for an all motor small displacement motor is to shift slightly past the power band in high *** gears like 4th into 5th. Those gears are placed much closer to each other.


OP: I believe that the D15B7 is out of a 92-95 dx/lx correct? If so, that motor should rev to around 6500-6800 RPM. So you're fine. Your motor is not a freak. That's stock redline.

 

I had my b7 at 7900 with a chipped p28 in it.

 

well my d15b7 in my coupe now goes to like 7400 but i wouldn't know IT DOESNT HAVE A TACH but i can drag third out to about 94 mph and i know it should only got to about 86-88

 

whats your RPM at 65mph in 5th gear?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B serious &raquo;</TD></TR><TR><TD CLASS="quote">

what? I hate when people say that. </TD></TR></TABLE>
people say that because it is true

 

idk in 4th and 45 it sounds about 2,600-2800 but then again im not sure.. my hatch is like 2300 at 45 in 5th

 

ok im not to sure what the d15b7 is out of. but the 94 del sol S came with it. and i know for a fact the that motor stars power band at about 4200 and drops out of the power band at around 5900-6100. and the point to shifting at the redline is so your next gear dosent drop way below the power band. yes it may drop a little below it but not 2000 grand below.. if it does your shifting WAY to soon


Modified by projekt-sol at 10:01 PM 9/20/2007

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by crazyguy &raquo;</TD></TR><TR><TD CLASS="quote">
people say that because it is true </TD></TR></TABLE>

how is it true? you're telling someone to shift out of their powerband as soon as they get into their power band. Try either one of these:

Method 1: Go to the drag strip. Shift RIGHT where your power band is. Then try it again redlining every gear.

Method 2: Look at a common D series dyno chart. even if peak HP is at 5900, the chart doesn't just drop off into oblivion after that. If you shift at 5900, that puts you somewhere around 3k in the next gear (dx trans). Compare the power at 3k to the power at 6.5-7k. Tell me which one is lower. It probably makes like 50 hp at 3k and about 70whp at redline. probably like 85whp at peak.

 

You're not making any power above 6300 or so...stop being a ricer...

EDIT:
PS: Stock tach probably reads about 500 RPM high at the redline, so optimal shift range on that would be when the tach says 6600 or so.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Syndacate &raquo;</TD></TR><TR><TD CLASS="quote">You're not making any power above 6300 or so...stop being a ricer...

EDIT:
PS: Stock tach probably reads about 500 RPM high at the redline, so optimal shift range on that would be when the tach says 6600 or so.</TD></TR></TABLE>

ok. redline in those motors is like 6500. So i guess we're on the same track. you ricer, you.

I did rev my D16Z6 to like 8k on downshifts a few times. Blowing that motor up was totally like Al Capone being busted by the IRS. After all the abuse it took, the timing belt that i refused to change finally took the motor out.

 

try and hit 7500rpm and let me know what happens....if it stops and bouces at 7000..keep trying it might make it

 

idk but i was ******* around with my buddy in his ek ex d16 and he pulled me by a good car froma 40 and about one n a quater from 60

 

d series = not ment for acceleration

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jdm91CrxSi &raquo;</TD></TR><TR><TD CLASS="quote">idk but i was ******* around with my buddy in his ek ex d16 and he pulled me by a good car froma 40 and about one n a quater from 60</TD></TR></TABLE>

**** happens.

My GTI saw 10,000 RPM because of a mis-shift. (whoops)

Naw, best one yet was me 'n my friend in his camaro on the highway - he went from 4th to 5th, went too far, slammed it all the way into reverse, rear wheels locked at like 110 on I-84, good ****.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B serious &raquo;</TD></TR><TR><TD CLASS="quote">

ok. redline in those motors is like 6500. So i guess we're on the same track. you ricer, you.

I did rev my D16Z6 to like 8k on downshifts a few times. Blowing that motor up was totally like Al Capone being busted by the IRS. After all the abuse it took, the timing belt that i refused to change finally took the motor out. </TD></TR></TABLE>

LoL - my Z6 tach has seen 8.3k or so a few times, but only b/c the honda tachs suck - that's not on downshifts either - you can hit 8k on the tach if ur just messing around (dougnuts 'n stuff).

Just shift at like 6500 or so on the tach - anything more than that is a waste b/c ur not making any power, that's all I'm saying .

 

meh. I rev everything to 9k now. B16A, B18C1, B18C5, D16Z6/Y8, F20C, Geo metro. It's all the same to me. valve trains love me.