I thought you should dyno in whatever gear gives you closest to 1:1 ratio. If you change the final drive to 4.77, then you may have to do it in 5th. I'll try to work out the math tomorow while I'm at work.

 

dyno'ing in 3rd has its roots back in the muscle car days. correct me if i am wrong, but in old 4 speed cars 3 WAS direct drive to the motor and thus used for dyno #'s. the same is not true in modern 5 and 6 speed cars.

i've pulled mine in 3,4,5. in fith my car makes 194rwhp, fourth 221, third 222. third and fouth are so close you can really pull in either, shouldnt matter to much.

 

how much F/I are you planning? I'm thinking about it also now...I need to "stay out of trouble". So a carb legal setup is probably what I need, and well with a 9psi pulley, tuned on the EMS and reved out further (may 10 if its possible) it'll probably be quick enough, and the 4.57/comptech diff seems to hold up with most of the F/I guys.

Now if you plan on a big 500whp turbo setup, don't even thing about a 4.57/comptech setup. Stay with 4.10s and go nissan

 

^^^^ if you use the AEM EMS you wont pass cold smog test = no carb legal

 

All aftermarket devices such as an AEM EMS, Hondata ECU reflash, VAFC, etc. are not carb exempt and therefore illegal in CA. Only the piggy-back device used by Comptech (and possibly Vortech) are carb exempt.

 

With a SC I think it's a great plan. I could see it being very beneficial. Considering the bottom end doesn't get a rapid jump in power, and the powerband is smooth with a SC then the gears should work well.

lol yes my mind is set on going the turbo route...however 500 may be a bit much. I'm looking or hoping to have a good set-up close to around 350whp. I'm thinking the added torque from the turbo set-up may be to much to add gears along with it. Down the road who knows, maybe I'll go for bigger numbers.
I don't see myself dragging the car, or really doing insane driving. Maybe some pirited driving on the highway with the occassional challenge here and there. Maybe just going with another stock diff would be enough? I don't know, but I have a hard choice ahead of me with all these options.

 

^^Not to be a d**k, but maybe you should ask some questions in the FI forum -- those guys would definately be the ones here that would know what kind of diff you need for what whp you want to make with a turbo setup.

 

I understand that...but IMO it is very easy to swap the stock ECU back in, then go get it smogged. Even if I have to swap out my injectors (9psi and I'll probably go with 660's) and the EMS, and add the Comptech gizmo that makes the S/C work. This is Vs. doing a full N/A build with a 2.5L (does that even run on the stock ECU?) or would I need to swap an entire motor. If it does run on the stock ECU, would it with cams? Or would I have to swap stock cams back in? If I was N/A I'd probably also get ITBs...and those would suck to swap all the time as well.

See where I'm going...swaping the EMS is easy. I do it all the time.


HvRRZ, yes, I guess that is a limit that hasn't been tested yet...you are the guinea pig. Though I there are lovefab guys on comptech diff's and they are making that much power and holding up. It doesn't mean you will but...I guess its another decision you have to make. I'm hoping to get 350whp eventually as well...I figure reving it out a little + a header and 70mm TB might and good tuning might get me close...If I only get to 330 ooohh...thats still plenty of power.

 

Guys i have a 2005 ap1 (f-20c and 9k) Right now i have t1r exhaust and test pipe , j's header , J's ecu , J's throttle body and J's intake. I havent dynoed my car but i guess i am around 220 or 225 at the wheels.
I want to get more n/a power. Everybody is giving me different ideas like ; better clutch and flywheel , headwork (port and polish) , spoon 2.2 stroker , spoon gasket and j's balanced pistons with headwork , single exhaust . I seperated every idea with a comma.
I m confused with all these ideas. Can you please tell me what you think and what you would do if you were in my place. Please add a different idea if you have one.

Thanks alot for your help
Tolga

 

A flywheel will help some...your mods are pretty respectable. How's your budget? If cost isn't an issue, go with a stroker setup, cams, cam gears, etc.
If you're on a budget, there's not much more you can eek out of it...you've almost all the bolt on basics covered.
A single exhaust will help...I'd go ahead and dyno what you've got...I think you'll be happy with your numbers