ok i am doing this post for a friend he have a 90 ef it was 4 speed he change the tranny with a si tranny and it will not go over 75-80 in 4th and 5th no powere but in 3rd it will go over that speed. lol i am lost on this one when he told me this thanx for any replays.

 

D15B1?

 

****ing weird.

 

The engine the car started with doesn't have much power. So in third, where it has a shorter ratio, it has the mechanical advantage to get the car over that speed.

It's probably a tired engine? Give a service and see how that goes.

 

upgrade to dual cam

 

There is something wrong but we would need more info to diagnose the problem. In that configuration, the car would take longer to get to and above 75 but nonetheless, it would get there.

 

that's wierd. my car went over 75 in both of those gears with my si trans. is his timing still dead on? is the trans making any noise? is the clutch slipping at all?

mine went through a quart of oil a week if not more, burning it all, and still went 90 +...

stfu post ***** that's not even remotely answering his question.

 

yeah the d15 is all stock

 

look is not my car i see every one saying twin cam. is a friends car not my ****.

 

i have not seen the car in person he just told me about it hey says the clutch is good tranny make no noise.

 

boost fixes all problems

 

lol i dont think he want to do that. i will not waist my time with it lol

 

so no one have a idea what can be wrong with my friend ef then

 

Check the timing, do a service (new plugs, oil, air filter, oil and fuel filters). I'm sure it will run better.

 

thats wierd cuz i have the stock dual point with an si tranny and it goes over 100 no problem. it takes a while but it gets there lol

 

I'd like to ad to replace the cap and rotor, costs maybe 20-30 bux and is worth it imo.

has your friend done ANY mods to his b1? my guess is that like some are saying it may be tired out. i could see it struggling if it were starved for air or if the cat was partially plugged. also, has he removed the secondary butterfly, or upgraded the cam at all? from what i hear those things help... i mean, i can see a visual difference in an si cam vs. the stock b1 cam lobes...

 

i dont know what he haves done to it i have not even seen the car. who know maybe he have everithing all F**k in there lol

 

Either tired motor, or it's a DX tranny and not actually an Si...

 

dx and si transmissions are have the same gears just that the si has a different final drive not a huge difference

 

IMO i think its because the 4 speed tranny has shorter gears and the 5 speed has longer gears needing more power. I have a 4 speed as well so thats just my guess.

 

fixed

fixed op did they replace your freinds clucth what was replaced other than the transmission as wheel as maintenance stuff

 

Has anything been done to diagnose this yet?