top speed

[s13eater]

what is the s12 geared for and will the s13 diff alter the gearing, what would mine be capable of at 6800rpm with 340bhp on 225/45/17's,come on martin this ones for you, serious answers though people.

[30psi]

The S13 diff doesn't alter the gearing.

Providing an engine can pull to 6.8k in 5th with 225/45/17's the top speed will be:
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172.2mph

[s13eater]

what have you had yours to in fith martin rpm.

[30psi]

I haven't tried taking it past 6000rpm, which is about 147mph in my car.

I let Adam have ago, and I'm sure the pisstaking bastard took it past 6, I had to tell him to let off.

[s13eater]

i know that ken did a 137mph at elvington, not sure of his bhp at the time, he got about 2mph more than alan spensley who has a rb25 with exhaust and filter, i just wanted to give it a run before i take the engine out for good.

[30psi]

To get to the top speed of a car it prob takes a minute to build up its last 10mph.

Thats quite a distance, so i imagine he didnt hit top speed

[adzs12]

Originally Posted by 30psi

I haven't tried taking it past 6000rpm, which is about 147mph in my car.

I let Adam have ago, and I'm sure the pisstaking bastard took it past 6, I had to tell him to let off.

Did you??? i remember taking it to 5 and you said you gota take it further than that. You always said to me i have to take mine to 6 atleast

[30psi]

I'm talking about you driving it in 5th gear numpty, when you drove it you took it just past 6k in 5th. In any other gear it has to be taken to 6.5k without a doubt (and you did). It leans off after 6, thats why I got ya to let off.

172mph was worked out using the gear ratios etc.

7.2k on 215/40/17 would be 174mph providing it could pull to that rpm in 5th.