teggsr925

hey guys i have a 93 civic hatch with a jdm b16a swap. p30 ecu no cel. i did have a cel yesterday for a knock sensor but i got another one and it isnt on anymore. car runs fine hits vtec and all just redlines at 7200. i dont think my cluster is bad cause vtec hits at 5200ish and redline in 2nd gear is about 60mph. i could be wrong. only thing different about the car is it has an ls throttle body. i cant figure it out and any help would be greatly appricated. thanks guyss

delsolproblems

What happens when you get to 7200?

teggsr925

hits the rev limiter if i remember right. its my buddies car, he just posted on my name.

Kuhniee

from what i remember i thought that around 7200 is where a b16a limits... not really that sure cause im still learning but i have a jdm b16a too and i think thats where mine limits out but not surenha

delsolproblems

The d16 redlines at 7200, B16 at 8000 (8200 rev limit). If you are able, try to borrow another ECU and see if the problems still occurs.

teggsr925

i did try a usdm p30 the other day but i did have cel for the knock senor. ill try it again tho. i was reading that it could be the dizzy. anyone ever heard of that. also i heard that the timing could be off by a tooth. i did juts have my timing belt replaced but it was by a top acura tech that builds 800hp motors. not ruling that out but id like to try and test other things first.

teggsr925

sorry in original post i forgot to mention i have a jdm p30.

Jimster480

sounds like an ECU issue. Because if VTEC is engaging when its supposed to then its not the sensor in the dizzy. And what knock sensor? OBD1 with a knock sensor?

teggsr925

it is obd1 with a knock sensor. i didnt no there was different ones. i just asked the guy i no at acura if he had any extra ones and he said yeah and i put it in and check engine light went out.

teggsr925

bummmpppp!! someone helpp mee outt.

teggsr925

i think i figured it out. i think it is the cluster. yesterday when i was driving i hit redline at the top of 2nd annd that should be at 60 mph at 8000 and i was doin 60 but the tach only said 7200. so hopefully thats the fix and this helps someone else out. ill write back after i get a new cluster. thanks guys

teggsr925

okay. so i bought i new cluster and it did the same things and then the rpms started gettin all wrong. like vtec crackin at 45 on the tach and reline at 55. im guessin the tac signal is messed up. what shoulde i check for?

Koopa Troopa

Both my 1991 and 1992 EG6's redline at 8550 with stock ECU's....

jdmsoljah

ecu man

teggsr925

even if the car is running normal just the tach is off? i can hear the car reving up when i accelerte and i see the tach only move a little bit.

Listerofsmeg

Definitely the ECU

teggsr925

before when i had the knock code i put a buddys usdm p30 and it was doin the same thing. (redlining at 7200 just like my ecu was doin) ill go try it again and see if it still does it with this tach or not. im also gonna check the wires behind the cluster and also inside the dizzy and see if theres anything dirty or wire loose or something.

300whpej

where did you get the ecu from? it seems like its actually a p28 in a p30 casing...what rpms are you at while idling?

mwaedow

are you still using the stock cluster that was in the car with the previous motor? If so, the markings are probably different, and it's just not reading accurately. The position of 7200 RPM on the original tach is different from the position of 7200 RPM on an Si tach, as far as the angle of the needle. I don't think the tach can compensate for a motor swap, it's just reading a signal from the crankshaft sensor, and the needle moves accordingly.

teggsr925

i bought the car with the ecu. its a jdm shortbox with somethiing like 32580-p30-a01 (i sure that wrongs i just no it says p30 on the tag. im idleing low like rigth above the 500 line i turned the flathead screw up a little on the tb so its in the middle. BUT i noticed when i was in it early today which this migth have been cause its cold but it was at about the 1000rpm line.

and if it was a p28 wouldnt the knock sensor code i threw before not show up. i thought p28s didnt have knock sensors? im sure im wrong but im just tryin to get as much info out as i can.

also. when i did try that usdm p30 and the revs bounced right at 7200 with that ecu as well, was that because the knock sensor code was thorwn?(it wasnt on at the time but if i wopuld have drove for a few minites it wouldve poped on. i only drove it down the street hit redline and came back.) idk hah im so confused with this.

thanks ahead of time for reading this and helpin me out.

teggsr925

there is a difference in the si tach and the ex tach? idk about the original tach when i had the car but i just bout a 92-95 tach off craisglist and its way off. but it wasnt at first it ran normal at first
( by normal i mean like the old one did) then started to be all off and everything. but the car felt normal. pulled hard, hit vtec everything sounded good to my ear from the motor like i was used to. i feel like if it was the ecu then the motor wouldnt be runing right. and i might be reading ur post wrong but ur sayin the tach cant compensate. a buddy of mine has the same swap same car with a chipped p28 and he says he revs past 8 grand easy. his never stopped and bounced like mine does so i dont think that the cluster is whats stopin it from reachin 8000.

and like i said before im pretty positive the rpms are off cause i looked here http://hondaswap.com/reference-mater...-vs-mph-28672/

and with 185/60/14 at 60 in second should be at redline at 8000rpms. mine said at 7200

B16A (92 ), USDM ITR, CTR Transmission



15' 195-50-15 Tires

14' 185-60-14 Tires

Tire Diameter = 22.7 Inches

4.4 Final Drive


Gear Shift RPM Speed @ 8000 RPM (mph)

1st N/A 38.2

2nd 5214 58.6

3rd 5541 84.6

4th 6074 111.4

5th 5128 145.4

RPM in top gear at 70mph: 3851


also when i was at 70 in 5th my car was at like 3400 not 3851 like it says here. maybe my speed sensor is off? and my tach?

teggsr925

well heres a little update. went to lunch drove home tach did the normal thing were is only went to 7200. well i got home looked around engine bay for loose connecters etc and saw that i had no ground from the tranny to the chassie. i put on it out of old 0 gauge wire i had and also cleaned the one that goes to the valve cover and the rad support. drove back to work and saw the tach is going a ltlle farther now. it went to about 7500-7700rpms. im gonna go check a few things more after work. anyone have any ideas on 1. why it would make a difference having more and better cleaner grounds. and 2. anything else i should try? other grounds i could be missin?

300whpej

your car cranked and ran without a trans ground?!?!?

good to see your getting your kinks worked out though.

teggsr925

yeah i called my buddy and he said the same thing haha. yeah i hopein im onto something.

what exactly does the grounds do??. i always thought it was just a way to stop the dimmer of lights whenever u touched something that used power like highbeams, power windows etc.

delsolproblems

Electrical circuits need a connection to the positive terminal of the power source to supply the electrons and to the negative terminal to provide the pull to make the electrons flow. The battery negative connects to the car body and most of the vehicle's ground wires also connect to the car body in order to connect them to the battery negative.