pewe
Chats A Bit
Posts: 157 
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Post by pewe on Jan 15, 2018 12:33:21 GMT
I had exactly this setup on my previous Mk1 1600. Didn’t produce the power of even the most basic turbo/Supercharged kit. The noise was epic & the throttle response was instant. Any excuse to show this.... Love the bit where it bogs down and your encouraging it by shouting "come on"  - pretty impressive otherwise. Cheers, Pewe. |
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Post by baconsarnie on Jan 15, 2018 16:12:27 GMT
I had exactly this setup on my previous Mk1 1600. Didn’t produce the power of even the most basic turbo/Supercharged kit. The noise was epic & the throttle response was instant. Any excuse to show this.... Love the bit where it bogs down and your encouraging it by shouting "come on" - pretty impressive otherwise. Cheers, Pewe. That drag out of Ettores is soo frustrating, particularly in a rwd car, one of your wheels is unloaded and you either spin up or bog... the entry into it is quality tho, get to be mega late on the brakes and ballsy on the turn in. |
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Post by Rickster on Jan 15, 2018 17:18:18 GMT
Dave Newman in the HSA champs runs ITBs, cams and probably a whole lot more besides - his car is v quick, i believe dynoed around 200bhp sandys will know a bit more about what he actually has. However he has chucked a lot of dosh at it just so he can remain NA and competitive Its a nice bit of kit though |
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Post by sandys on Jan 15, 2018 17:50:48 GMT
Both Dave and Dean are over 200bhp, Dave has nearer 220bhp with his 1910cc engine. Deans is a little less though he is building the car into a 2.0 so it will be interesting to see what his builder gets out of it, I think its target is better torque spread rather than high power, both are very quick cars being stripped out with lightweight hoods etc, both have given me a hard time in the HSA championship. Daves car with him in it is 50kg lighter than my car is empty they have good straight line pace, they appear to struggle in the bends compared to me but reckon that's just setup or driving style related as Jon is a lot cleaner in his turbo mk1 than those guys. Dave and Dean will have spent some coinage getting the cars where they are, it'll be in 5 digits, but the results are there, neither are as quick as Jons turbo though, make's NA tuning all seem a bit pointless Problem when competing with boost though as Jon found you get put in with 4wd turbo nutters and their traction and generally higher power levels give such an advantage on sprints and hills as they can drop you by 1s in the first 64ft. Guess it all depends on how much you like revvibg out to 9k |
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tsp
Chats A Lot
Posts: 439
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Post by tsp on Jan 15, 2018 19:34:06 GMT
I’m not sure my pockets are deep enough for 200bhp! I bet it sounds incredible though! I’ve had some brilliantly helpful advice from members here and also some great help from a couple of specialists. I’ve decided to put some money aside and get the lot done at once. Cams, headwork, ITBs and a set up. Seems senseless getting the car mapped twice. Thanks for your help everyone  |
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Post by Reechard on Jan 15, 2018 19:58:00 GMT
This is what I want to do. Always wanted a 5 on itbs. My long term plan is eventually itb, cams and some head work.
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Post by josho on Jan 18, 2018 19:23:02 GMT
If you want to itb your mx5 it's not for outright power, it's for the character and epic noise of an itb engine
That said I'm doing big boy cams and 45mm itbs and a sexy af exhaust manifold this year 😀
Best thing for an itb engine is shorter gears
I run a six speed and 4.3 torsen in mine.
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Post by apextwin on Jan 19, 2018 9:02:57 GMT
Having driven Robins car (bacon sarnie) all I will say is a well sorted ITB car is epic to drive!!
The noise / smells / throttle responce is addictive. Its not about how fast you go in a road car but how fast it feels!
As a competition car in hill climbs a well sorted Mx5 NA is competitive in the up to 2000cc roadgoing class. You will have to spend some money on the engine to run at the front - as you would do in most other cars eg clio 182...
I need more power from my car as it only has 240bhp (FM" gt2560r) at present. its fun in a different way in terms of the feel of the engine.The feeling of the boost building is addictive. But as a pure fun road car id rather have a good ITB setup. Mine isnt really a good road car anymore so I just pootle it to events. Its proper fun trying to mix it with more exotic machinery. The "miata" chassis has a lot of potential with good dampers / setup - following the US knowledge base from 949 for example. Im sure mine will handle another 100bhp easily and transmit it well in the confines of a hillclimb course.I will definitely be a bit closer to the Evos then!
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tsp
Chats A Lot
Posts: 439
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Post by tsp on Jan 19, 2018 12:47:11 GMT
If you want to itb your mx5 it's not for outright power, it's for the character and epic noise of an itb engine That said I'm doing big boy cams and 45mm itbs and a sexy af exhaust manifold this year 😀 Best thing for an itb engine is shorter gears I run a six speed and 4.3 torsen in mine. This is revolutionary! I never thought of shortening the ratios. This is essentially what I’m trying to achieve, the liven it up. So would a 6 speed box mated to the diff my UK spec 1600 should be quite short? Doing this would give me time to sort a motor out. Apextwin 240bhp blows my mind, I know that’s typical power for a turbo but I bet to someone who’s not used to that sort of power (me) it’d be bonkers. |
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Post by melx5 on Jan 19, 2018 13:29:53 GMT
Am I right in saying itb's give instant throttle response not engine response, you will hear the induction noise as the butterflies are opened but this isn't going to translate into faster acceleration as such as in real terms you haven't had any worthwhile gains in the bhp department.
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Post by joeytalent on Jan 19, 2018 14:22:29 GMT
Am I right in saying itb's give instant throttle response not engine response, you will hear the induction noise as the butterflies are opened but this isn't going to translate into faster acceleration as such as in real terms you haven't had any worthwhile gains in the bhp department. With any ITB setup, you'll also be adding a new ECU, which will give you the ability to modify the fuel and ignition maps - which will translate to more power if you get it mapped properly. I can't find the article now, but ITBs can add power due to the sheer volume of air you can pull into the engine, as you've removed the airbox restriction. I also put cams in mine, which definitely made a huge different to the midrange power. |
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Post by apextwin on Jan 19, 2018 15:12:36 GMT
240bhp in a light does feel pretty potent / fast. My speed trap speeds on the hills are similar to things such as Ferrari f355 and 996Gt3! But some of the modified EVOs have 600-700bhp!!
Everybody wants more power on the hills probably even those with 700bhp!
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Post by josho on Jan 19, 2018 18:40:24 GMT
Am I right in saying itb's give instant throttle response not engine response, you will hear the induction noise as the butterflies are opened but this isn't going to translate into faster acceleration as such as in real terms you haven't had any worthwhile gains in the bhp department. It depends on what you are seeing as worthwhile, I didn't itb my mx5 to gain power, I did it because I always wanted a car with itbs, to me that made it worthwhile to fit them. I then at a later date added some cams into the mix and also the six speed box which helped hugely. Once all this was done the acceleration was pretty potent. But as everyone seems to say, it wouldn't match a turbo, but what does that matter at the end of the day when you have your car how you want it and it sounds insane to boot? |
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Post by josho on Jan 19, 2018 18:45:28 GMT
If you want to itb your mx5 it's not for outright power, it's for the character and epic noise of an itb engine That said I'm doing big boy cams and 45mm itbs and a sexy af exhaust manifold this year 😀 Best thing for an itb engine is shorter gears I run a six speed and 4.3 torsen in mine. This is revolutionary! I never thought of shortening the ratios. This is essentially what I’m trying to achieve, the liven it up. So would a 6 speed box mated to the diff my UK spec 1600 should be quite short? Doing this would give me time to sort a motor out. Apextwin 240bhp blows my mind, I know that’s typical power for a turbo but I bet to someone who’s not used to that sort of power (me) it’d be bonkers. Yes, if you throw a six speed in your car, even with the standard power it would be far more lively feeling! |
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Post by melx5 on Jan 20, 2018 7:47:18 GMT
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le sigh
Jul 15, 2023 20:03:52 GMT
le sigh
Jul 15, 2023 20:03:52 GMT