Will running an ls tranny on a gsr motor kick it out of v-tec because of the gearing. I know the gears internally are the same in 1st and 2nd but in third there different?

 

the ls tranny has longer gears, but anyone correct me if i'm wrong, i dont think it should kick it out of vtec though.

 

i'm guessing it would land it outside of vTAK. in my GSR, shifting at redline hits your right at 6k, so you've got 200rpm to spare or so with the GSR gearbox. not sure how much taller the LS box is, but if you like math, and find out all the ratios and whatnot, you can figure it out without actually doing the work.

 

I think what you overlooked is the final drive on the LS is about 4.2 and on the gsr it is 4.4. Since the actual cam change in the gsr is around 4400RPM I doubt if it will knock you off the big cam however I am almost positive you will have to wait for the secondaries to activate which is around 5500-5800RPM (I forget the actual numbers)

Bottom line: I cant think of one good reason why someone would switch out a gsr tranny in favor of an LS one on a vtec motor.

 

You would stay in vtec but you would have to reprogram the ecu to open the secondaries at like 5000rpms to get any real use of the vtec's power, not to mention other mods, cams, light flywheel would help the most I bet. I think It would be a fun project to tune this set up.

 

Thanks for your help, I bought the motor and it didn't have a tranny and all I could find was an LS Tranny

 

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Keep searching. It will be worth it to get a b16 or GSR tranny matched up with that motor. Try the classifieds forum. Good luck

 

i have a b18c1 w/ ls tranny. im running a pr3 ecu w/ 8k redline.
anyways when i shift at redline, it falls to just over 5k rpm. hope that helps.

 

it depends where you have vtec set at
when I had vtec set at 5700 it would hop out of vtec for a second but now that ive changed my vtec engagement to 5200 it stays in vtec when I redline