i recently bought a 95 gsr that needs a rebuild. i was thinking of buying an engine kit that included srp 11:1 pistons and eagle rods. would i be able to safely run the 11:1 compression on the stock ecu with 92 pump gas?

the head would be stock as well.

i've researched hondata, which by itself is relatively inexpensive, but i am unfamiliar with tuning it myself... and i'm not sure how expensive it would be to have it tuned by a dealer.

 

I ran mine, but only until I got hondata and my injectors installed(and I never got on it). I wouldnt recommend it, but you can do it. Actually, I really wouldnt recommend it since you dont have other mods to go with it.

 

well i do have basic bolt-on mods ready to put on the car once she is rebuilt. aem v2, dc sports 4-1 header, aem pulleys and a msd 6al ignition. but no injectors, i should shop around for some. how did you have your hondata modified to meet your compression needs?

 

also what does anyone know about aem's ems or greddy's e-manage systems when compared to hondata? hondata is obviously cheaper, but is it as user-tunable as the more pricey systems?

 

to answer my own question i downloaded the ROM editor demo and it seems really easy to use. i think i am going to buy the s200 system. but again, what type of injectors are you running now?

 

from what i have seen and heard, the Hondata is the best way to go, cause you can always change out the chip if you change your motor to turbo/ whatever down the road. As for injectors, i've heard nothing but good things about RC injectors. I'm running the venoms, but they are only 10% larger than stock. Hope this helps a little.

 

i wouldn't run your car as of yet...since you've got all the basic 'air' upgrades...your motor will run a lot leaner with those high comp. pistons. if you must run your car...at least have a FPR and turn your fuel pressure up a bit.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by shermanyang &raquo;</TD></TR><TR><TD CLASS="quote">i wouldn't run your car as of yet...since you've got all the basic 'air' upgrades...your motor will run a lot leaner with those high comp. pistons. if you must run your car...at least have a FPR and turn your fuel pressure up a bit.</TD></TR></TABLE>

The fuel/air ratio will not be affected by the compression ratio. I think shermayang is trying to say that you may experience knocking. You can run it, just set your timing at 16 deg. BTDC, not 18. If these pistons are forged, the ECU may think that your engine in knocking when it is not, resulting in a loss of power. If that is the case, you may need another ECU.

 

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

If these pistons are forged, the ECU may think that your engine in knocking when it is not, resulting in a loss of power. If that is the case, you may need another ECU.</TD></TR></TABLE>

and by another ecu you mean one that recognizes the compression change and adjusts the fuel mapping accordingly right?
can hondata achieve this?

 

He means that p72's have a knock sensor and the ECU will think you're knocking. A p28 on the other hand, doesn't have an ECU, but I'd highly recommend NOT running that unless it was modified/chipped.

 

what about jdm pistons. i was thinking about getting some jdm os itr pistons and those those in a gsr motor according to c-speedracing.com my comp ratio will be
11.362493622638828 and thats b4 a mugen or toda headgasket. could i run this set up with a p72 and with i/h/e without further modding the car. even though i would upgrade the ecu it would be stock ecu until i get more money 4 it

 

oh alright i gotcha

 

whoops... that should read "doesn't have a knock sensor" [above]

 

yea i just assumed that, lol

 

well, we'll just have to see what happens

 

what about just getting a VAFC and tuning it that way?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by geeser95 &raquo;</TD></TR><TR><TD CLASS="quote">what about just getting a VAFC and tuning it that way?</TD></TR></TABLE>

I do not like piggy-back computers.

Correct me if I'm wrong, but a VAFC only modifies the MAP sensor signal at WOT. Of course it also modifies the VTEC crossover, which is bad; the computer has individual fuel maps for each set of cam lobes, and some piggy back computer is switching the lobes. (See the warning on page 6 of the manual.)

http://www.apexi-usa.com/produ...I.pdf