Well, time for an update on how its going.
Took the carback to MSC 2 weeks ago for the final remap and boost upgrade, should now be runing 300-310bhp I could deffinately notice the difference over the low boost setting pulls very strongly now al the way through the range and off the end of the speedo, well to where it stops anyway.
Having just got back from the Nurburgring I managed to get the chance to go flat out coming home chasing a rather fast porsche, being at the speedo stops at a smidge past 150 I bought an origin B2 for the GPS speed read out for when I was abroad.
At the time i had a friend in the car and the bootspace was full with luggage, well 2 sports bags so anyway in an Exige S1 it topped out at 164 MPH! GPS. Car felt totally stable at this speed and still had a few RPM left in it, just think th drag stoppped it going further. I have a small video of it taken inside the car with digital camera waiting for my friend to email it to me, not sure how to upload vids anyhere though or link them.
Still im very impressed withthe conversion and anyone is welcome to a ride at croft.
CYA all there.
Christian
bleedin heck…
now i can understand the sub 9 min 'ring lap …
At the time i had a friend in the car and the bootspace was full with luggage, well 2 sports bags so anyway in an Exige S1 it topped out at 164 MPH!
The weight isn’t going to make a big difference to top speed, may even help push it lower to the ground. In any case the downforce would have been adding a whole heap of virtual weight. At 100mph the car is 10% heavier and aero is sort of exponential (any experts?) so goodness only knows how much grip you’d have had!
I wonder if that’s the fastest an Exige has ever been? Wouldn’t surprise me, although that made South Afrian drag strip job may rival it.
Ian
Yep he did 2 runs to back up his speed on the day and it averaged out at 317 km/h (198 MPH) that was without the wing , some special aero wheel covers and a very special honda engine setup on the day. Apparantly it was not a pleasant car at that speed without wing, i would have thought so though. That was for a land speed record event so the car was set up accordingly.
164 MPH is very quick in a road exige, must be nice not to see the porkers dissapearing when the speedo gets to 140mph and to just keep going.
Would love to see that video
Nice on Christian, sounds like a LOT of fun. I’m popping into Maidstone later hoping for a quick blast in one of their supercharged beasties and I can’y wait.
Ian - I think drag goes up with the cube root of speed. Don’t confuse -ve lift with drag though as they are two different things. The Exige has some downforce, although not much, but it does have loads of drag which makes it feel stable.
When I have a chance I’ll do the numbers on 164mph vs 303bhp and see what the drag figures really are.
Out of curiosity (honestly !) what torque do those S/C Hondas put out to achieve 300bhp ? Do they still rev to 9000rpm (which would make it 200lb/ft ? if my 5252 calc is right)
Randy, downforce goes up with the cube of the speed as well. By my calcs, the Exige will be generating 215 kilos of downforce at 164mph. Not a huge amount compared with your Nissan, but at >25% of the weight of the car, certainly enough to help with stability.
How does drag make the car feel stable?
Cheers Brendan, that’s the sort of figure I was expecting.
I’m sure Randy will confirm, but my guess would be that the drag is a bit like towing something, and hence keeping the back end straight.
Ian
Interesting. I guess that makes some sense. My understanding was that the key to aerodynamic stability is to have more downforce at the rear than at the front.
Also, imagine the car’s going sideways. If there’s more drag at the rear of the car that at the front, the car will naturally tend to straighten itself. Just like the flights on a dart. Apparently, this is where those crazy fins came from on old American cars.
My rev limiter kicks in at 8600rpm, I have had a shift light fitted also as when i had the conversion done I had a lightened flywheel and it revs so quickly in 1st,2nd and 3rd I kept hitting the limiter, to be honest in those gears all the lights come on at the same time.
Should be getting the incar video tomorrow so i will check what RPM I was doing flat out, Randy mentionted he could work out the drag/downforce when he knew that.
I dont remember any of the shift lights being on which start at 8000rpm but to honest i was looking where i was going so they may have been.
Assuming you’ve got about 4, you’re setting your shift lights very close together!?
Ian
MSC offer the conversion with the Honda civic r engine…right…?.. But do they also offer the s2000 (240 hp) engine…??? I know it has a bit different dimension compare to the type R. so maybe it wont fit??? Anyone knows somthing about it…
Niceguy
Yep engines are different, but more importantly:
Civic Type R engine/gearbox = transverse fitting
S2000 engine/gearbox = longitudinal fitting
Out of curiosity (honestly !) what torque do those S/C Hondas put out to achieve 300bhp ? Do they still rev to 9000rpm (which would make it 200lb/ft ? if my 5252 calc is right)
David, you’ve become addict to Audi’s massive torque, hey…
If it ain’t got way over 300 Ft Lb I ain’t gettin out of bed…
Put on weight then mike?!
I put it down to a love of Kit-Kat and a lack of sex !!
Perhaps I should rethink my life strategy ???
Perhaps I should rethink my life strategy ???
Mike
given the free time you have had and the toys in your box…i think its us that need to rethink ours
Went to Brands on Saturday for the EERC and Quo’s beast is now easy to pick out to the trained eye Who was the other Exige parked up by the gate?
Good to see you Christian/Randy and hard luck to Randy & Simon with their early retirement
[image]http://www.btinternet.com/~benandpaula/quoexige.jpg[/image]
![http://www.btinternet.com/~benandpaula/quoexige.jpg[/image]](http://www.btinternet.com/~benandpaula/quoexige.jpg%5B/image%5D){kind=link}
MSC offer the conversion with the Honda civic r engine…right…?.. But do they also offer the s2000 (240 hp) engine…??? I know it has a bit different dimension compare to the type R. so maybe it wont fit??? Anyone knows somthing about it…
I just got a reply on a mail from MSC about the S2000 engine… : “The K20 A2 is alot more advanced than the S2000 engine and is a big step forward”…
Im no expert in engines, but I just thought the s2000 engine is far newer compare to the K20 A2 engine (from 2001?)… And since it might be a newer enginge and produce more horsepower its not making sense when they say “The K20 A2 is alot more advanced than the S2000 engine and is a big step forward”… Im sure Im missing somthing here… … Just curious