I figured I would bring this up.

Long story short... when the Greddy RSX-S turbo kit came out, I installed it on a customers car ASAP. The results sucked, it was running way too rich and it had a wierd studder around 2000RPM that was HORRIBLE. Even after putting on the FMIC and bringing up the boost a psi or 2 it was still too rich.

For several reasons I was determined to let Greddy fix it. We could have over-written the Greddy maps in the E-Manage but once you do that you cant go back. I didnt want to risk creating a tune for his car and then if something happens down the road Greddy telling us its our problem since we over-wrote their maps.

Not to mention I was affraid there was a compatability issue between the E-Manage and the RSX since it had that wierd studder and basically I just didnt want a part of it until Greddy gave up or something... and they did NOT give up.

Some time had gone by, but they have got the problems 100% fixed.

They sent my customer a new E-Manage system... and they actually sent it to him before he sent his back so he could still drive the car. When he got the new one from Greddy he plugged it in place of the OG one and came over to my shop.

I put the car on the dyno and it ran PERFECT. It had a very flat and clean 12.0:1 A/F. The 2000 RPM studder problem was GONE. This car drives perfect now.

Personally I would prefer to see the A/F in the high 11's for a long term pump gas street car... but it will be fine.

The output results were interesting. I will post the dyno when I go to the shop in just a little bit... still at home in bed here.

One thing is tho, I couldnt get it over 8 psi without it getting TOO LEAN!!! I think this is either a issue with stock fuel pump output, or an issue with the returnless fuel system not giving enough fuel pressure when we start boosting... or both. So all that crap will be the first to go next time the car is in.

At 8 psi the PEAK HP output was equal with a 2000 Si with a Drag Gen III (Running E-Manage instead of FMU) kit at 8psi. However the powerband in the RSX CRUSHED the 2000 si, with over 75HP more at 3500 RPM.

As for the torque... between the 2 the RSX of course demolished the Si. I cant recall the numbers off top of my head so give me a hour or two to post the dyno of them both over laid just for comparison purposes. BTW dont think I am biased just cause I did the RSX myself... cause I did that Si myself too... I just wanted to show the customer that while we did not get the peak HP we were looking for, when we compared it to other turbo hondas he really does have them beat by a lot more than meets the eyes at first glance.

And now I am very happy cause I have 2 of those RSX kits in stock... I had them sitting there for MONTHS i wouldnt even advertise them or try to sell them cause I didnt want to sell anyone a bunk product until Greddy fixed it... so now I can open up the boxes and send those E-Manages to greddy for the replacements and finally get my money back out of those things! SO now everyone is happy I guess.

-Charles

 

i think you should talk to greddy about it running too lean when upping the boost

i know this is slightly different, but on the rsx (mine and others), the fuel pressure guage is normally at about 51-52psi and on a 100 shot of nitrous it stays nailed at 51-52psi

so the stock fuel pump and stock injectors seem to be doing their job awfully well

 

well what you are telling me if that the stock pump can support the power for the extra 100hp shot you are running... this is good information.

however keep in mind its a little different with boost. on a NA car, your pressure differential between an intake at 0 vacuum and a fuel rail at 52 psi is... well... 52 psi.

the pressure differential between the intake at 8 psi and your fuel rail at 52 psi is of course 44 psi.

see what im saying? This is why cars with return systems typically run a 1:1 raising rate at the FPR.

i am still pretty new this is the first K motor i have been playing with tho... so I am not yet 100% familiar with its fuel system, until I start going over the fuel system in this one. so forgive me if I am missing anything.


Modified by mister2racer at 1:10 PM 10/17/2003

 

Ok here it is:

The blue runs are the Greddy RSX at about 8psi. As you can tell from the dyno run, the VTEC needs to come down considerably. You can also see that it has 2 minor lean spikes... nothing that I dont think will cause a problem, but I would definatly prefer that they were not there. I wish Greddy would not password the tunes in the E-Manage so that we could make minor adjustments for this.

When we turned up the boost at all it would get way too lean, in the 13's:1. Hopefully its just the fuel pump setup and not a matter of Greddy not tuning the E-Manage for more than 8 psi. If it comes down to it, we will over-write the greddy file and build our own... thats if it gets to the point that the greddy tune just isnt keeping up.

The red dyno run is a 2000 Si on a Drag Gen III kit with the FMU removed and E-Manage installed. As you can see on the top end there, that car was running out of fuel too. We had a upgraded pump in that car, but the injectors that were in there, 310 I believe, were not keeping up at that fuel pressure.

At any rate, I posted the 2 together to show that while the actual PEAK HP is not super exciting, the car still a torque and HP powerband to dominate this Drag Gen III Civic.

I dont want anyone to get defensive and say that the civic could be making so much more power yadda yadda, I am well aware that it can, they both can, but thats not the point. The point made is that these 2 cars have very similiar modifications, the significant differences being that the Civic had an upgraded fuel pump, and the RSX has a slightly smaller turbo.

thanks

 

Sweet! This is very tempting. N/a cannot match those tq #'s

 

That's intense..