I was told by my engine builder, that I can use a GSR ecu to run my H22 prelude EG. He said it would be faster and more efficient, then my Civic mugen chiped ecu. Is this true or false, Help!

 

true and false.... those mugen programs are garbage...fuel and timing is made for mugen spec engines which are way different than what ur running... and a p72 ecu will run lean w out a vafc for tuning (at least) perferably something like hondata... Heres what Jeff from IB has to say...



This is an OBD1 Prelude VTEC motor with (blue line) H22A ECU, (red line) GS-R ECU. This motor does not have any Fuel controllers such as a V-AFC from ApeXi. It does a have a fuel regulator. But nothing to change VTEC with...this is your standard, low budget setup...
Blue line: H22A ECU, is the daily driver choice. The power is smooth, there is not a noticeable lag when you go up the RPM's. But the fuel is not perfect for maximum power, as you can see up top. The VTEC comes in later, on the stock ECU, so that is why its smooth....

Red line: This is the GS-R ECU. VTEC comes in earlier....so you get a HUGE lag....but after that...the power screams and in the high RPM, you have more power considerably. THis would be a better pick for drag racing, but a little uncomfortable at about 4500 RPM, because it lags. Your ripping up to 4400 RPM, then it just falls on its face...then it screams again...but its good for racing.

It should be of note that the Lag cannot be fixed with simply a V-AFC. This is so because the timing and fuel curve cannot be changed enough to make it all go away. Timing at all...What can fix this problem is a Hondata System.

The results speak clearly....

The motor has a milled head, all the bolt on's, stock cams, stock intake manifold, S pistons. Cams have the sole effect on VTEC lag....The cams are obviously too big for the GS-R ECU.

Jeff

 

I have heard that if you have obd1 h22 with peak and hold injectors that you need to swap them out for saturated injectors to be able to run the h22 with the p72. Can anyone prove or disprove this?

 

You need an ECU with fuel and timing maps that are designed for the H22A.

Neither the "Civic mugen chipped" nor the GSR ecu will be ideal. I would say that of the two, the GSR ECU would be better if for no other reason than it can open and close your secondary intake manifold runners. But the both the GS-R and "mugen" ECU ecu will have fuel and timing maps deigned for a smaller engine with smaller injectors. Both the Civic and GSR ECU will run an H22A dangerously lean without being reprogrammed specifically for the H22A.

Andrew

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CHK4TIX &raquo;</TD></TR><TR><TD CLASS="quote">I have heard that if you have obd1 h22 with peak and hold injectors that you need to swap them out for saturated injectors to be able to run the h22 with the p72. Can anyone prove or disprove this? </TD></TR></TABLE>

I'm running a p72 w my peak and hold injectors. It's no problem... I also have my P72 hooked up w a hondata and would not do it any other way..

 

OT but dang 96SR-V, how the heck did you run a 13.86@98.99mph?? I run 98 traps and I'm hitting mid 14s with a 2.3 60'. what's your mods and 60's??

 

I pm'ed u...lets keep the post on topic...

 

Well I have also seen that dyno graph on importreview.com with the p13 vs the p72 on the h22, but does anyone know if the butterflies were left open or not for that run? Cuz if they were hooked up normally, that would mean that vtec hit at about 4700 with the butterflies CLOSED. This could explain the huge drop in power. With the p13 ecu the butterflies open before vtec, but its the other way around with the gsrs.

I wonder what the graph would look like with the butterflies left open the whole time with the p72 ecu.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by laugHin22CX &raquo;</TD></TR><TR><TD CLASS="quote">
I wonder what the graph would look like with the butterflies left open the whole time with the p72 ecu.</TD></TR></TABLE>

good point. anyone else have numbers on this?

 

what ecu are you using, I believe I have a civic ecu programmed to run a dohc. This was told by a friend, I have no clue too ecu's. Please educate, my car runs really strong but he vtech does not pull hard until 5900 rpm and when I say hard its literally night and day when it hits 5900. help!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by aklucsarits &raquo;</TD></TR><TR><TD CLASS="quote">You need an ECU with fuel and timing maps that are designed for the H22A.

Neither the "Civic mugen chipped" nor the GSR ecu will be ideal. I would say that of the two, the GSR ECU would be better if for no other reason than it can open and close your secondary intake manifold runners. But the both the GS-R and "mugen" ECU ecu will have fuel and timing maps deigned for a smaller engine with smaller injectors. Both the Civic and GSR ECU will run an H22A dangerously lean without being reprogrammed specifically for the H22A.

Andrew</TD></TR></TABLE>
you are wrong...im running a chipped p28..GSR mugen program and its much faster than my p13 i have plenty of feul, and theres no lag on my car, the lag come from people not hooking it up right a GSR doesnt open the secondaries till 6k, so when vtec kicks in at 4500, your running only on your one set of runners so it bogs, running with your secondaries open all the time is the way to go with a GSR setup...and i have plenty of track and tuning expierence with the diff ecus, i wish i wouldve been able to get printiouts of the diff ecus to show you