Well, the other day, i was driving on the highway to a distant town, and on a LONG straightaway, i realized I hadn't topped out this lude yet. I have a '93 Lude SR (canadian model) Now, my last lude was a '93 SI 4WS. In the 4ws, I ran it up to 136 before I ran out of gear. Well, when I went to top this one out, It got to 120, and would simply do no more! I talked to the speed shop in the city I got to, and they said it's quite possible that somewhere down the road someone might have thrown a Prelude S (F22) tranny in. Was there a diffrence in ratios of gears between the 4th gen S, SI & VTEC trannies??

 

Sounds like you reached the fuel cut off. My jdm h22a chokes out at 120mph, it hurts. Im pretty sure the f22a tranny will go past 120

 

Wait..... I know that if you put the car (99 5th gen in my case) to far into redline, say 7300-7500 rpm, the car will stop feeding you fuel, but it'll do it just out of sheer speed too??? Now, I have a 99, not a 93, but does this all mean that the car is forced to top out a 120? If so, how do I go about changing that?!

 

well, the reason I think I ran out of gear, rather than power it the fact that I was still at 6500 rpm. which, yes, is the the redline for the H23, but I also have an MSD digital SCI, which has no rev limit, and If I REALLY wanted to (never do ) I could rev to 8k every shift. but in 5th, it would not bring me past 120! Well, maybe it could be a fuel cutoff @ 120, how would I go about altering this? Would it be a thing w/ the canadian ECU?? 'cause I still have the usdm ecu sitting in my garage from my last lude....

 

yes it would be the ecu if its your fuel cutting off.

 

JDM, EDM and Canadian ECU's are electronically limited by the ECU to a top speed of 118MPH. The only workaround is to edit the HEX address that limits top speed and set it to FF (which is well over what our cars are capable of).

USDM prelude ecu's are NOT limited for top speed

~kris

 

a-ha! thanks ludeboom!! but about the trannies, is everyone elses' lude (w/ an h23) redlined at 120mph?? you guys don't think the tranny would have anything to do w/ it? I don't want to bring my car past redline to hit it's top speed....
Also, i've seen these posts turn into "why do you need your car to go faster? how often do you go 120" well, i just like to know that I can & that's all.

 

well from past experiences I've had mine @ 140. just don't stay near or above 7k too long...bearing failure will happen

 

I had my SI up to 140 back in the day as well. If anything the F22 tranny has longer gears and would top out at 150. To get rid of the fuel cut you can also get the rev/speed meter by apex-i from what I hear. This will alloy you to bypass the governor
KAY- I wouild also try the other ECU if you did want to test the limits. It should just plug in.