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Post by V6 on Aug 27, 2019 6:59:37 GMT
By "best for track" I meant the K series are the lightest option. Small, light, alloy engine. No extra mass of SC or turbo gubbins needed. So a chunk lighter than an OEM cast iron mazda engine. Yeah it's easier and cheaper to do nothing
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Post by atlex on Aug 27, 2019 9:15:34 GMT
Enlightenment, Russell...
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Post by V6 on Aug 27, 2019 13:11:53 GMT
Even easier... Rent a new diesel and be exactly the same as everyone else. The holy grail
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Post by Vindi (Russell) on Aug 28, 2019 9:40:32 GMT
Even easier... Rent a new diesel and be exactly the same as everyone else. The holy grail Ha ha, sadly you're not wrong ... I guess half of my quest is a reaction against that ... I have to drive a mundane diesel box for work, so I'm chasing a dream with my 5 ... it's probably not achievable, but I'll keep chasing it anyway!! I'll keep following Black Cat and their K20 swap, but I have a feeling it wouldn't be enough? The only K20 swap I know of was supercharged because it just wasn't that quick on track. I'll speak to the owner again and see what their thoughts are Edit - my mistake, that one is a supercharged F20 ... 375bhp and no traction issues ... hmmmm Just gone back over some previous bookmarked pages and a K24 with minimal work (better exhaust, intake manifold etc) can get close to 300bhp ... Russell
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Post by V6 on Aug 31, 2019 13:08:41 GMT
Lots of options. Pros and cons for each.
I posted a video in my Honda V6 thread where someone reviews a basic version. Kinda sums it up I guess. He mentions the K24 being kick ass, but hard work (peaky engine) and that it "beats you up" (noise etc). By contrast the V6 route is way more effortless, less noise, more torque everywhere in any gear at any rpm.
Clearly a V8 will take the above to another level yet again. At a cost (price, weight, balance)
Just go with whatever floats your boat
Oh ps, for the record in case anyone searches this in future. The real power for a JDM version J32A (from the Type-S accord) is... With the following bolt on breathing mods only...
3.2 J32A JDM variant (same as J32A2 in USA), 90mm K-tuned throttle with Mustang adaptor, Holley intake plenum conversion, Ported runners, CompTech headers, 2.5" exhaust, AEM management, Zero internal mods...
On a warm UK August morning in the real world measured is:
300bhp / 333nm
Graph in my build thread.
So only about 5bhp shy of the cool Greek dudes LFX, according to his own video. Wiki suggests similar too.
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Post by warpspeed on Feb 17, 2021 6:19:41 GMT
I think what makes the Miata so lovable is the combination of light weight, excellent weight balance, and good throttle response. Its real fun to drive, even if its not the fastest car on the road.
Anything that makes the car less nimble and is detrimental to throttle response spoils the fun factor IMHO, even if it actually ends up being faster in a straight line. I believe the key to this is to stay with a light weight four cylinder engine, and fit ITBs even if it has forced induction.
The Nissan GTR has ITBs and forced induction, and its a well developed well engineered induction system, and not noisy. Quite possible to use two of the three dual throttle bodies, and a cut down GTR plenum in length to fit on a BP engine. Its basically a whole GTR induction system with the two middle cylinders removed. It works because the cylinder capacity, port sizes, and valve sizes are fairly close between a GTR and a BP engine. Bore spacing of BP is 91mm. Throttle body bore spacing of GTR 91mm.
Should put the sharp throttle response back, either normally aspirated or with forced induction. Unfortunately no way for me to post pictures here or I would show you.
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Post by Zed. on Feb 17, 2021 9:04:38 GMT
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Post by Vindi (Russell) on May 30, 2021 9:31:52 GMT
I think what makes the Miata so lovable is the combination of light weight, excellent weight balance, and good throttle response. Its real fun to drive, even if its not the fastest car on the road. Anything that makes the car less nimble and is detrimental to throttle response spoils the fun factor IMHO, even if it actually ends up being faster in a straight line. I believe the key to this is to stay with a light weight four cylinder engine, and fit ITBs even if it has forced induction. That's exactly why we fit things like the Honda J series V6 engines or the Chevrolet LFX, they're lighter than the clunky BP engine, and way more powerful but don't suffer from the chronic lack of torque the K swaps suffer from I don't think Forced induction is a great idea on these cars if track use is the aim, too much stress and heat leads to all sorts of problems. It always seems to be the NA cars still lapping into the afternoon It's interesting looking back at this thread with what I've seen / learned over the last year or two ... I'm still collecting parts towards an engine swap but still undecided which way to go. K swap ... decent power but lack of torque (220 / 150). Revvy engine, but it has to be strangled to get the power, horrible sound. Problems with the sump / steering rack, and the swap kit and engines are pretty expensive. Can retain MX5 box and rear end, lighter than the Mazda engine J swap ... Nice power and torque (265 / 265). Not a super revvy engine, but nicer sound. Problems with the sump and bonnet clearance. Swap kit is cheap, but not comprehensive, engines are cheap. Same weight as the Mazda engine LS swap ... high power and torque (400/400). Not a revvy engine, but glorious sound. Very comprehensive swap kit, but high cost and lots of work. Need to change box and diff, prop and driveshafts and some chassis modification is needed. Heavier than the Mazda engine ... +100kg, but weight balance not affected much Mazda KL V6 swap ... low power and torque (165 / 155), but nice sound. Kit is very cheap, but not that comprehensive. Retains Mazda box and back end, similar weight to the Mazda engine Jag V6 swap ... decent power and torque (240/230), nice sound, not that revvy. Swap kit is very expensive (£10k, more than an LS kit!), but comprehensive. Retains Mazda box and rear end Russell
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Post by Vindi (Russell) on May 30, 2021 9:55:12 GMT
On a warm UK August morning in the real world measured is: 300bhp / 333nm Graph in my build thread. So only about 5bhp shy of the cool Greek dudes LFX, according to his own video. Wiki suggests similar too. Interesting figures, but essentially what this shows is that a modified J32 engine with aftermarket ecu and £000s spent on mods is 'almost' as powerful as a standard LFX engine on the standard ecu ... I think I'd rather have the same power out of a standard, unstressed engine, and the option to tune it further I say that with a J35 engine and swap kit in the garage ... might sell it and go LFX if I can just find an engine! Russell
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Post by Zed. on May 30, 2021 10:37:07 GMT
go LFX if I can just find an engine! I've been looking into Lfx's..... theres plenty of engines in UK Rich.
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Post by Vindi (Russell) on May 30, 2021 15:22:47 GMT
go LFX if I can just find an engine! I've been looking into Lfx's..... theres plenty of engines in UK Rich. Find me one, I can't find any, just a few in Lithuania / the US!! Russell
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