I want to run the Si ecu for Sh*ts n giggles. I have it hooked up and it only, once in awhile, goes past the 5500 limit but only goes to 6000rpm. And then sometimes it will go to the 7200rpm limit of the Si. What do I need to do to make it go to the Si consistantly? Would putting the ebay mugen chip in it make it work?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CrxHf-Rider &raquo;</TD></TR><TR><TD CLASS="quote">What do I need to do to make it go to the Si consistantly? Would putting the ebay mugen chip in it make it work?</TD></TR></TABLE>

I'm not even sure how to answer "how to make it go to the Si consistantly."

Here's my guess (I don't mean to insult you either): Get an Si motor

or....you can build up your motor

My guess is that the HF isn't producing enough power to hit 7000rpms. It sounds just like my 94 CX, i usually don't go past 4000rpms, mainly because the power drops off.

 

Hmm the hf has a whopping 62 hp, how fast do you expect it to go. Its not set up like the si. The power curve is way different, one is set for performance and one is set to gas mileage.

 

poor 8-valve head trying to rev what a 16 valve does

 

^^ What he said. The HF engine was never meant to rev that high.

 

I might have taken my Hf to 5000rpms once. I usually shift around 4000rpms.

 

the limit on the PM6 (the ecu you have) is 6500

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by md88hfcrx &raquo;</TD></TR><TR><TD CLASS="quote">the limit on the PM6 (the ecu you have) is 6500</TD></TR></TABLE>



Ya, no way u were doing 7200!

 

Destroy your motor!

 

and your gauge cluster doesnt even go to 7200. it goes to 7000

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by md88hfcrx &raquo;</TD></TR><TR><TD CLASS="quote">and your gauge cluster doesnt even go to 7200. it goes to 7000</TD></TR></TABLE>

Both things you said are wrong. I even went out to look at the HF to make sure. The tach goes up to 8000 (deep in the red), and a PM6 cuts fuel at 7200 RPM, 6500 is the indicated redline.

 

 

you neEd to CUUTtt dERRRrr wire foo0r b00ooossTTttt

 

i was in a bad mood till i saw this post. First question to you why would you want to rev that high. Hf motor+Hf tranny= a really long time to get to 7,000 rpm for what a good time. For one the motor wasnt ever meant for performance The motor tranny combo was set for fuel mileage It would be a good question if you had a motor swap. if you want to rev that high get a motor swap.

 

i think i'd beg to differ on the limit rev limit of the pm6, i believe the older ones had a higher rev limit than the newer ones did. normally i shift mine between 6200-6700 if i'm beating on it. the other week i was missed 3rd horribly bad and the tach almost hit 8k rpms no joke, i know the factory tachs can be pretty inaccurate but not by almost 1500rpms i don't think.

 

haha oh well.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by godruler &raquo;</TD></TR><TR><TD CLASS="quote">i think i'd beg to differ on the limit rev limit of the pm6, i believe the older ones had a higher rev limit than the newer ones did. normally i shift mine between 6200-6700 if i'm beating on it. the other week i was missed 3rd horribly bad and the tach almost hit 8k rpms no joke, i know the factory tachs can be pretty inaccurate but not by almost 1500rpms i don't think. </TD></TR></TABLE>

What year do you have? Mine was a 90, and I still have the ECU, my friend is about to put an A6 into his HF, and he has an 88 ECU, I can check for you.

 

What is the point of revving a motor to 7000+RPM that stops making power well before 5500RPM?

 

Like I said for ***** and giggles. Its not a completely stock hf i have a header back exhaust and a cold air intake. When the Si ecu is hooked up, when it actually would go to 7200, i could feel the power throughout the rpm was much different than the hf and I felt a lot more power thru the shifts not necessarily the 5500-7200rpm range. As I shifted thru gears It had more pickup. I am just curious as to why it only sometimes goes up to the Si 7200 rpm limit.

 

Another reason why is because I was told that you can put the Si tranny to the hf for a closer gear ratio than the hf and that because its different you get more power. So if I put in an Si tranny I would want it to rev that high.

 

The question is, you have an hf, are you trying to blow it up? It is an fuel economy engine. You can hook the pm6 and si tranny to it, but its still a hf. It still won't have power, still only has 60 something horsepower. All you are doing is moving the power band around, not freeing up extra horses.

 

the factory camshafts do not make power that high.

its not an ecu or tranny issue.

its compression and air flow, really.

no shame in swapping for an a6 man, you can usually find them for cheap, the wiring is pretty much plug and play with an HF as well...

 

Not to drag this out anymore but why is it that it does sometimes rev up that high?

 

*** dynos are about as accurate as a blind suicide bombing palestinian with downs syndrome.

The best way to make any power is to get a d16a6 head. That is your biggest bottleneck. Then the trans, then the intake manifold. All the ecu will do with that weak head is flood it with fuel and add some timing - you would probably get better power if you move the dizzy for added timing and ran the HF ecu.

 

I wanted to do that. I bought a ported and polished si head, intake manifold and a zc cam and camshaft. Then I came to find that I had to replace the pistons with dx pistons cause the hf pistons are not grooved for the 16 valves.