I am running a pr3 ecu witha y1lsd tranny and my fuel cut off kicks in right about 7900 acording to my autometer tach?? what could be the problem I am not throwing any codes??
thanks
MATT

 

I have a pr3 b16 in my REX too. Not quite sure when my fuel cutoff is but my governor kicks in at about 115mph. Which sux ***** cuz I know it has a lot more in it. Wish I could hrpl you out man, but this just sparked my problem in my head...thought id share it with you, hope you dont mind

GOOD LUCK!

 

Yea TypeR I heard they were goverened at about 115 too. I have never had mine over 100 though so I am not too sure.
Any body have any suggestions about my prob

 

hrmm, no idea.. i have the exact same setup (even with y1/lsd) and my cutoff is 8200...

 

if im not mistaken, the autometer tach, is off by like 300rpm, cause i installed my tach today, and i compared it with my stock tach, its a little bit off, and on my tach, cuts off at 7900rpm, but before i installed the tach, according to the stock tach, it was at 8200, wierd....i might be wrong..

 

well considering that the autometer tach is hooked up straight to the power wire on the dizzy that would mean that your stock tach is the one that is 300+ rpms off and that the autometer is exactly right. and mine also cuts off at 7900. but my vtec engauges at 4600 also. bone stock b16 w/ pw0.

 

It seems very weird to me... I guess maybe my ecu just decides its tired of waiting and cuts in...hehe
My Autometer tach is wired inside of my distributor. COuld it be a bad ground on the autometer? When I am at an idle and turn my turn singnal on the Autometer needle will twitch with the blinker and ocasionaly jump up quickly but the car is idleing smoothly?
thanks for the replies any more thoughts
Later
Matt

 

It's probably actually cutting at 7660 which is where the PR3 automatic ecu cuts out at.

 

yea but it is not an automatic ecu????
any other suggestions?
Later
matt

 

How do you know it's not at automatic ECU? Post the serial number off the ECU and I can tell you for sure. Just so you know automatic ECUs work the exact same on PR3's as the manuals, it does not throw any codes the only thing it does is fuel cut at around 7700

 

Here is the serial number off the side of the ecu
37820-pr3-003
410-102001 AA

is that automatic or manual ecu?
thanks
Matt

 

can anyone verify if its an auto or manual ecu?

 

in 88-91 ecus (PM6, PR4, PW0, PR3, PM7):
5spd = 000, 001, 002, A00, A01, A10, J00, J001, C01, C00
Auto = J51, J50, A50, A51, 901, A60, C50, C51, X30, A80

This is all I got, email Adrian at http://www.hyperducktuning.com

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by allmotorsircrx &raquo;</TD></TR><TR><TD CLASS="quote">well considering that the autometer tach is hooked up straight to the power wire on the dizzy that would mean that your stock tach is the one that is 300+ rpms off and that the autometer is exactly right. and mine also cuts off at 7900. but my vtec engauges at 4600 also. bone stock b16 w/ pw0.</TD></TR></TABLE>
4600 vtec...I noticed this too, though my ECU might be a little weird considering everywhere says that vtec engaged at 5200....

 

alright thanks guys
I e-mailed hyperducktuning so hopefull the will e-mail me back soon. Anyone else have an suggestion?
Later
MAtt

 

well I have searched and searched and still no answer? anyone
LAter
Matt

 

from what i heard, the tach in your cluster is going to always be different from an external tach like autometer. you dont' knwo which one is exactly identical. espically when you have a swap. u won't know which one is truely accurate. as for fuel cut off, i'm running pr3 as well
i hit governor at 180 km/h
and i can rev all the way to 8200 i believe, but i don't have an external tach, so if it goes past 8 grand, i'm assuming its 8200. and my vtec kicks in according to my Si tach at 5 grand. hope that helps any.

 

ehh, i had a pr3 ecu, with j1 tranny and according to my vafc 8159 is fuel cut off.

 

My PR3 fuel cutoff is 8.1k rpm. VTEC engages at 4800 rpm by both the butt dyno and the Dynojet dyno. Check the dyno sheet in my sig if you're curious.

*edit* NVM, looks like my dyno chart is down... I'll re-upload it tonight.

 

alright thanks guys for the responses. The car pulls extremely hard so I am guessing the ecu is a manual ecu.
thanks again
later
Matt

 

Like I said before the fact that it is manual or auto ecu does not effect anything other than sensor checks in obd-1 and fuel cut on all. It is the exact same program, stock PR3 map is a stock PR3 map regardless of if it's jumpered for auto or manual.

If it is an automatic ecu you can convert it to a manual ecu by de-soldering one jumper inside and soldering it into the position next to it. This will bring you up to the 8200rpm rev limit.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by beta13 &raquo;</TD></TR><TR><TD CLASS="quote">Like I said before the fact that it is manual or auto ecu does not effect anything other than sensor checks in obd-1 and fuel cut on all. It is the exact same program, stock PR3 map is a stock PR3 map regardless of if it's jumpered for auto or manual.

If it is an automatic ecu you can convert it to a manual ecu by de-soldering one jumper inside and soldering it into the position next to it. This will bring you up to the 8200rpm rev limit.</TD></TR></TABLE>

then explain why people with at ecu fuel is cutting off at 7500 rpm?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by beta13 &raquo;</TD></TR><TR><TD CLASS="quote">Like I said before the fact that it is manual or auto ecu does not effect anything <u>other than sensor checks in obd-1 and fuel cut on all</u>. It is the exact same program, stock PR3 map is a stock PR3 map regardless of if it's jumpered for auto or manual.

If it is an automatic ecu you can convert it to a manual ecu by de-soldering one jumper inside and soldering it into the position next to it. This will bring you up to the 8200rpm rev limit.</TD></TR></TABLE>

As I said it effects fuel cut, I dont see what your question is. The fuel and igntion maps for automatic and manual PR3s are the EXACT same, the value for fuel cut is determined by the circuit on the ECU's board, if the jumper is one spot (J67 if I remember correctly) it's a manual and fuel cut is at 8200, if the jumper is in the other spot it's an automatic and the program fuel cuts at 7600.


Modified by beta13 at 11:34 AM 11/14/2003

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by slowpokesi &raquo;</TD></TR><TR><TD CLASS="quote">then explain why people with at ecu fuel is cutting off at 7500 rpm?</TD></TR></TABLE>

I can't say about the PR3s, but I know on P28 ECUs the auto/manual conversion is as simple as removing 2 resistors and installing 1 jumper. Plug it in and it'll run like stock, same fuel mapping, same rev limit as manual transmission. I just did it about two weeks ago.