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Post by sandys on Aug 30, 2017 16:14:51 GMT
Yup that would have been Dave.
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Post by minty on Aug 30, 2017 16:20:41 GMT
Yup that would have been Dave. Nice chap!
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Post by atlex on Apr 4, 2018 17:13:33 GMT
Purely on cornering performance....
I'd say an NA car gives best response on corners where you are at part throttle... than any other option, supercharger comes after that, followed by small turbos.. and big turbos are the worst and very RPM-dependant.
On straights though... FI wins out.
Where you aren't feathering the throttle, just blatting it through the rev range, your supercharger/turbo will always give better acceleration because it produces more torque.
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tsp
Chats A Lot
Posts: 439
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Post by tsp on Apr 12, 2018 8:33:42 GMT
This is a great post It makes me feel slightly better about not being able to afford the engine work I want right now. I don’t know why but 150bhp NA is the holy grail for me. Maybe it’s because it’d give me a similar power to weight to the Elan that I lust after (?) Utterly ridiculous view really. The Elan didn’t have electric windows or power steering did it, so quite why I want my NA to be an Elan is beyond me. On a different but the same subject, a friend of mine has a supercharged 2.2 VX220. Properly quick and suits him perfectly. Too much for me though. WOT for milliseconds at a time and I’m not good enough for that type of driving. The carpet under my accelerator pedal is worn out
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Post by jackyboy on May 28, 2018 9:27:32 GMT
Ive always been na 1.8 standard power. There is something magical about being able to mash the throttle through corners without worrying too much about losing traction. Definitely teaches you alot about keeping the momentum up.
I do seriously lack power on the straights though and sometimes trying to carry too much monentum through corners on the throttle can be scary. Prime example is camp corner at castlecombecircuit. Im trying to carry so much speed through the corner because i know i need to because of the straight (folley isnt straight) that can grt sketchy doing over 82mph plus through camp. I barely hit 115mph and take that speed over avon rise. Sketchy as canoe sometimes.
I need boost to calm me down i think!!
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Post by sandys on May 28, 2018 10:45:02 GMT
Boost isn't going to calm you down, you are just going too approach a lot faster and still try and carry the speed around but at least when you come out the otherside you'll have some pace unlike now. I'm much the same trying to carry as much as possible in corners as I don't have straightline pace.
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Post by atlex on May 28, 2018 19:11:30 GMT
Another thing - you can achieve some dynamic boost control stuff. Someone's done it with MS and I'm sure ME221 can do it too.
Instead of controlling dumbly for balls-to-the-wall full boost at all TPS positions you can put in a function / gradient - say 90+% TPS == full mapped boost, which might be 1bar, make it do 0.5 bar for 60% TPS, 0.6 bar for 70% TPS etc. etc.
This should provide some throttle control for mid-corner.
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Post by Rickster on May 30, 2018 10:40:11 GMT
What you need is a big turbo and ALS like they fit to Rallycross cars that’d be fun Expensive I suspect😀
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Post by atlex on May 30, 2018 16:31:18 GMT
What you need is a big turbo and ALS like they fit to Rallycross cars that’d be fun Expensive I suspect😀 Expensive on manifolds too. Those setups run bloody hot.
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Post by JamesMk3 on May 30, 2018 17:18:03 GMT
What you need is a big turbo and ALS like they fit to Rallycross cars that’d be fun Expensive I suspect😀 ... and an oxygen bottle plumbed into the hot side intake, with a button on the steering wheel, for instant spool-up. Just like in Group-B. No idea why it got banned!?
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Post by Zed. on May 31, 2018 13:48:12 GMT
What you need is a big turbo and ALS like they fit to Rallycross cars that’d be fun Expensive I suspect😀 Expensive on manifolds too. Those setups run bloody hot. I used to work on & service (also navigated in) a Mitsi Evo6 rallycar, never had manifold issues - used a standard factory item!, infact, it was superbly reliable unfortunately for rallying it needed a restrictor in the turbo's inlet so power was limited to 360hp & 550ft/lbs torque using Carless 'funny-fuel' (a Tommy Field engine) Rich.
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Post by jonathanlc on Jul 7, 2018 19:23:50 GMT
I love my little MX5 1.8 NA, in it I have loads of fun at legal speeds. In my 911S (3.8) I have loads of fun at (illegal) speeds. It's horses for courses! The Mazda allows me to have fun without the men with blue lights getting involved whilst the Porsche is so much more capable that to have fun it has to be (a lot) faster! My answer would be NA all the way, the chassis on the Mazda whilst good was never designed for loads of power, in fact if you read the book about designing it, it was a conscious decision to build in handling limitations so it was fun! Mazda MX-5 Miata Roadster Veloce books. ISBN 1-904788-29-7 it's a good read and no, I have no affiliation with them
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Post by niklas on Jul 15, 2018 20:58:52 GMT
Oh cool. atlex do speak the truth about tps/gear/speed based boost control. It makes big boost a lot easier to manage. Also, my gtx builds boost blipping the throttle on idle.
As above, having race both n/a and turbo cars. N/a is a lot easier to drive, turbo cars take more energy lap per lap, but a turbo mx5 will usually be a lot faster. A rotrex car is the golden path in between, feels much like a k-swap to drive.
Edit: for a street car, I'd take the turbo every time. You do have control over your right foot. It just takes less time to break every speed limit there is if you want to. In my car. I don't break the speed limits usually. In its last, and slower iteration it made 0-200 in 17 seconds the only time I tried. With 150kgs extra in the car. But the track is where it belongs.
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Post by blinkmotorsport on Sept 26, 2018 22:42:30 GMT
This is a dyno plot of an NA car that we recently modified. The car is a Mk1 1.8 and produced 90 hub HP as standard on our dyno (Mazda claim 128 bhp @flywheel). After modifications the car now produces 177 hub HP. Conversions from Hub/Wheel/Flywheel always cause arguments on the internet but 90 Hub HP is what we see from most 1.8 MX5's and this car is now producing double that HP - I let you do the maths for flywheel power but we are pretty sure what it is :-) (1.6 MX5 is around 80 Hub HP and a Mk3 2.0ltr is 120 Hub HP)
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Post by jackyboy on Oct 4, 2018 22:02:45 GMT
I can safely say you can daily and track a sc car in traffic and short trips.. touch wood mines been ok so far.
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