ok so me and a buddy were talking about diff **** on our cars and something does not add up.

his car teg w/16" wheels, itr motor, b16 trans (em1)

my car hatch w/14" (but road sign radar verified), gsr, usdm itr trans


he his turning 4k rpms at 120kmh (74 ish)

me 3k rpms at 70mph

so WTF. i know both trans are supposed to the same minus mine being lsd pics below



mine




his

 

Maybe you have an ls 5th? See what your rpms are in 4th at 70.

 

well as far as i know this is a VIRGIN r, i am 3 rd owner since new and my buddy bought of og owner of the R when they went k


*** edit trans was rebuilt by OG r owner, very possible its ls 5 th

 

Chances are you don't have an ITR trans. An LS 5th wont drop you 1000rpm. 300 - 600 rpm depending on who you talk to. If you're really lucky it's an LS 5th and the tach just isn't all that accurate.

 

well considerig it has a j4d stamp AND a dc2 vin tag i say its all good

 

i will try and get my hands on another rpm cluster to verify rpm's

 

Never trust the stamp or VIN tag. Sometimes people will swap guts. It's not always with malicious intent either. I've had to swap cases before due to a cracked/broken case.

 

tru, i belive after thinking about it is combo of cluster and ls 5th. i am running stock gsr ecu and my cross over on rpm's like 4800 so that makes me think its off a few hundred anyway

also considering i am 3rd owner of trans and my buddy second and NEVER opened it himself and he bought from OG r owner. i do belive only thing done was (if any) ls 5 th

 

did this this am on the way to work and got 4500 rpms' tho if my tach is off like i am starting to think it would put me closer to 5k

 

Be careful with reading stock tachs.. I know mine is off bye a 1000 rpms at 8000.. My stock tach reads 4400 when vtec engages which is 5100..

 

Sounds like an ls to me. My b17 tranny which is basically the same gearing as an itr, is at 4000 in 5th at 70. My old ls would read 3200 at 70 in 5th

 

yea i think i have a combo deal

miss reading tach and ls 5th

 

the rpms look right for an ls transmission. my stock ls is around that rpm at 70.

 

I think your whole tranny is an ls. Doubt the tach is that far off

 

nope gears are to close ratio for LS.

 

Ok so drive 4000 rpms in 3rd gear and tell me what your speed is. Keep in mind with smaller tires your rpms will be higher which is why I think you have an ls tranny. Small tires on an ls tranny can make it feel somewhat short.

 

well my "small" tire is LARGER than a 205/50/15 so that rules your idea out. and rpms are read off the TRANS

 

Hmm well I thought you had small tires but it was the 14" wheels that I read. And yes tire size affects rpms too. Good luck with your ls trans.

 

Looks to be a ls trans. Match your buddy gear to gear.

Ls 5th in a 4.4fd gearbox would have 2-3 mph less than a straight ls

 

um, no. road speed is read off the transmission. RPM is read off the distributor. rpm is rpm, regardless of transmission is in the car.

 

so it turns out it WAS my cluster. i put a cheap wire in tach in car and bam proper R rpm/speed. also swapped in a spare rpm cluster and it shows proper rpm/speed for the R trans.