Depends on the tracks you drive ? I've never hillclimbed in my life, nor trackdayed, but I love a country lane blast in beast mode especially up hill.. My feeling is throttle response accuracy in the corners benefit from the SC..
Bigger SC ? Get some advice from an SC tuner on how to ring more out of it ?
Get a ride in a turbo car ? Are you "lagging behind" turbocharged mx5s in your competition times ?
Definitely keep to a smaller turbo if you go turbo, gt25 ? td04 with some tricks ?
Post by Vindi (Russell) on May 12, 2019 8:23:35 GMT
I went from supercharged to turbo, and then went back. The way the supercharger delivers the power is just so much nicer.
As above, I'd agree that Rotrex is the best option for really useable power. There's a Rotrex car in the US currently just under 400bhp, so there's plenty of head room as long as you pick the right Rotrex unit
Ah, now a Rotrex might be a good option. They’re a lot of £ though.,
Same money as a quality 3-400bhp capable turbo? If you don't need that much power, there's maybe no real huge in changing to a turbo? You can get 220bhp ish out of an MP45. So unless you want a lot more than that, and are ready for a forged engine, better gearbox and diff, updated chassis etc, is it really worth it?
Might be worth adding a brief rundown of what your current power / supercharger setup is, what your main use for the car is and your target power. And then what you've currently got for clutch, gearbox, brakes, diff, any chassis mods etc so we can think about what might be needed for the next stage?
Less than 200hp. IC’d M45, Oil Cooler, Alloy Rad, ME221, IL Motorsport mounts. 6kg Lightened flywheel & Skuzzle Clutch, std 5speed box with shortshift, Torsen 4.1 diff, (IL Motorsport mounts sat in the garage waiting to go on...) Std sport chassis with Brembo Discs & Carbon Lorraine CL5 pads, HSD monopros, Full track Geo setup, Rainsport 3 tyres(!!!!)
I use the MX5 almost exclusively for sprints & hillclimbs: What I’m looking for is something tractable so I can get out of hairpins & still be quick on high speed tracks. A competitor of mine has a 700kg 200hp turbo’d car & peak power is done at 5700rpm, I beat him outright at Goodwood where I can take advantage of the handling but get stuffed at Gurston due to my extra weight ( I still win on handicap). My target is a 260 hp dry map & 200hp wet map if I went turbo.
Am I correct in thinking superchargers are better for low-end pick-up but turbos are better for top end power? Unless you get a small turbo that spins up quickly? But that then means you have less top end because the turbo runs out of puff at higher revs?
Would a (custom?) hybrid turbo be a way to get low-end pick-up but also good top-end?
If low-end grunt and tractability is important, a SC would seem the better fit if all of the above is correct and a custom turbo wouldn't give what's needed down low.
Would there be room to twin-charge as an option??
Could you consider increasing engine capacity through a bored-out block and oversize pistons?
Been doing a little more research. Looks like a Rotrex C30-84 is the favorite & handily TTS are only 15mins from where I live....
whats the £ for hp cost likely to be? I'm guessing not cheap and how much could you offset with the sale of your existing setup? (guessing the m45, bracketry & pipework as you'd be able to re-use the rest of your setup?)
wannabe: What's the punishment for a lapsed MOT nowadays? Diary commitments and the need to still put it back together suggest missing my MOT date but needing it before I can get one sorted...
Jul 2, 2019 21:41:31 GMT
Zed.: used to be a ~£30 fine BUT I believe its income related....... (or it was 9 years ago when I got done )
Jul 2, 2019 23:46:11 GMT
Crumpets: "Standard cost" is £54.85 - (That's the highest VOSA will allow a garage to charge for a standard car test) most garages usually do it for £30-£50 to be competitive.
Jul 3, 2019 7:05:46 GMT
JamesMk3: Issue with no MOT these days is as soon as the test elapses, insurance won't cover you. If the old bill catch you, it's 6 points and £300 FPN, or court, which can be anything up to a ban and unlimited fine.
Jul 3, 2019 15:58:45 GMT
wannabe: Is that actually true?? What happens if you're driving to an MOT without a current MOT, which the law permits you to do?
Jul 3, 2019 21:28:13 GMT
Crumpets: You’re only allowed to drive your car when its MOT has expired if you’ve booked an MOT and are driving to the test centre. If you’re stopped by the police on the way, you’ll have to be able to prove that you have an appointment.
Jul 4, 2019 7:51:01 GMT
Crumpets: If your car fails its MOT, you can only drive it if the previous year’s MOT is still valid (i.e. the test took place on a date earlier than last year’s). If your vehicle is deemed ‘un-roadworthy’ the above doesn’t apply and you can’t drive it on the
Jul 4, 2019 7:51:58 GMT
Crumpets: By 'Un-roadyworthy' - I mean if it has failed its MOT on a "Dangerous" defect as per the changes applied on the 20th May 2018. Sorry to spam the chat, just a little difficult to explain in 256 letters haha.
Jul 4, 2019 7:55:23 GMT
wannabe: Info is always welcome I thought that a Fail is a Fail is a Fail now - so you lose the ability to drive on the previous MOT in all circumstances?? It also is not clear if your insurance is invalid without an MOT?? I thought it was valid!
Jul 4, 2019 10:17:58 GMT
FFS Corders: Ask your insurer about that, they will be able to give a definite answer over if they'd pay out or not. The fact you need insurance to take it to an MOT and not tax should be a good indicator
Jul 4, 2019 12:39:38 GMT
Crumpets: Alarm keeps going off in the night - Getting annoying now & I wasn't popular at 4.30AM. Gurrrrr
Jul 6, 2019 7:52:12 GMT
wannabe: This is why I think alarms are a bit of a waste of time nowadays - everyone ignores them, gets annoyed by them, and thieves will take the car if they want it anyway... lol May I suggest a steering wheel lock?
Jul 6, 2019 11:49:04 GMT
Zed.: ~20 + years ago, I used to remove the battery, gearstick & steering wheel from my 2L ford engined Chevette (was living in a dodgy area of Swansea)
Jul 6, 2019 15:27:16 GMT
FFS Corders: Gearstick is a new one for me lol
Jul 6, 2019 16:10:20 GMT
Crumpets: Battery is good, I've jkust installed a battery isolator to stop it, only does it once ever so often - Might remove it down the line and keep it for the central locking aspect.
Jul 7, 2019 13:27:22 GMT
FFS Corders: Yaay MOT passed. Now got a few niggles to fix soonish
Jul 9, 2019 16:11:17 GMT
Zed.: niggles? is that a word for friendly advisories? always a feel-good moment when you have that pass paper in your hand, 12 months to worry about fixin the next problems
Jul 9, 2019 20:44:03 GMT
FFS Corders: Only one of those was tempermental hazards. The others are genuine niggles such as a couple of tired hoses and calipers that are on the way out. Getting a proper MOT means I find out what to prioritise
Jul 9, 2019 20:52:53 GMT