I have a whole gsr engine I'm building and just want to swap out the usdm gsr for the usdm type r pistons. Everything else will b stock besides skunk2 manni and headers. Wanting a DD without having to dyno tune.

Wanted to know would I be ok to run with just a chipped ecu?

 

Anybody?

 

Do you need a dyno tune? Not if you can get a good street tune. But you are going to be leaving power on the table. And if you are gonna leaving power on the table, why even switch to the Type R pistons??

 

I figure the compression will be like 10.8-11.0

I have the c1 block but Jdm gsr crank and rods, so stock compression is 10.6 on jdm p72-00 pistons so I was hoping just swapping the pistons to usdm type r for just a lil more pep. I know not a lot of gains but a year from now I will upgrade performance.

So since I have it pulled apart I wanted to put the usdm type r pistons in and have it dd, then next year I will do some modding.

Will I b ok?

Thanks for the help

 

If your going to all the trouble of rebuilding a motor, why not tune? Even tuning stock engines has great benefits. A well tuned motor is alot more clean running, and trouble free. Beside unless you change the setup again you really only have to do it once.

 

Just get a chipped p28 and tune it. You can find chipped ecu's for like 100-150 and you can get a decent tune for 50-100.

 

Stock GSR ECU will work fine since you are not increasing compression by much. But the coorect answer is have it dyno tuned.

 

The GSR ecu may work, but i wouldnt get on it too hard until you do get it tuned. Or, if you have an adjustable FPR, bump it up like 2 psi.

 

and you dont need a P28. Any OBD1 ecu will work. Theres a huge misconception in the Honda community where a P28 must be used. If its going to be socketed and chipped, it doesnt matter as long as its a OBD1 ecu. This is why P28 prices have gone up because people are brainwashed.

 

Thanks everybody who posted. So all I need is a fpr? And ill b fine as long as I don't get it in it hard? Also I have a obd1 p72 socketed and chipped but I want to order a chip that'll help the motor. Which base map should I get?

These are the answers I'm lookin for

Thanks again guys

 

There is no "chip" that you can order to run the motor correctly. You need to have the ECU chipped with Crome or Hondata and have it tuned. But Like I said the P72 ECU will work just fine and not cause any issues since you are only increasing compression by a little 10.6:1 going to 11.04:1 is not a lot and the stock ECU can compensate enough. Again though tune it for the best results.

 

Sounds good. As f22master posted above would I need to get fpr to b safe?

 

Why in the world are you trying to go into the motor, bump the compression up without even tuning it? Why in the hell would you half *** stuff like this?

Save the money, and get it tuned properly. If its your daily, dont do it half ***, do it all at once.

You live in georgia, plenty of tuners within a reasonable distance including myself, JD from Redline performance, Mike @ TDC, and Blake barr @ BBMoto.

 

Could I send my p72 ecu in and have it chipped for s100 and b safe? I'm low on budget and I need this motor up and running till I catch back up then i can tune it. If I have the money of course I would do it the right way but as of right now I'm on a budget.

 

You dont just get it chipped. Thats only half the equation. You have to have it tuned. And to have it tuned, the tuner has to hook up an Air/Fuel ratio gauge to your exhaust and make sure that your fuel mixture is not too rich or lean, during all driving conditions. And he will also tune your ignition curve to make max power without detonation. This has to be done in person, while the car is being driven. But you can usually get a decent tuner to get you a good tune for around $50-100.

 

Ok thanks. Here in ga te closest one I could find was balance tuning and they charge $165 an hour. Everywhere else is 2-3hrs away.

 

FPR is totally not needed in this case. Even a mild turbo build will not need one stock is fine. Now if you where building a 300whp NA or 400+whp turbo then yes a FPR is needed. An OBD2 ECU is smart enough to adjust timing and fuel on the fly to compensate for the slight increse in compression and if you have it tuned the tuner will adjust fuel in the fuel maps.

 

Ok lookin into getting a wideband, somebody told me I have to keep my stock o2 sensor and weld another for wideband?

Doesn't the wideband replace the stock o2 sensor so u don't need it anymore?

And if I do have to keep the stock o2 sensor where do I weld the bung hole for the wideband?

Thanks guys

 

Help

 

balanced performance in sugar hill, import experts in winder, diy auto tune also in sugar hill, batlground in smyrna... all do dyno tuning.

all you need to do is google, and i'm sure you'll get more...

 

and regarding your wideband o2 sensor - it can do both.

you can replace the factory o2 with the wideband and run the narrow signal from the controller to the ecu - but you will have a cel for the heater.

or, you can go to any exhaust shop and get a second bung welded in for about $25.

again - google is your friend.

 

I tried lookin but wher is the best location for the wideband sensor? I read some said not to close to the exhaust port or it'll shorten the sensor life and to far away from the exhaust port and won't get an accurate reading.

I was thinkin mayb beside the stock o2 sensor but at 2 o'clock on the collector. Does that sound good or no?

 

Op, its pointless to install those pistons unless you plan on tuning it. In fact your more likely to make more power using the money you would spend on the pistons and getting your current setup tuned. I'm currently running a gsr with p73 pistons and only way i would not ping is if my dizzy was fully retard. Finally i switched to obd1 and tuned my car all i could say is wow i wish i did this sooner.

 

yes - 90 degrees from the stock sensor, but slightly in front of or behind as to not cause a restriction is good.

 

Yes I've read and read around and I've decided to get the s300 and do it right so I'm waiting on the hondata dealer to email me back about the total price.