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Post by peanutbutterjelly on Jun 9, 2022 6:07:58 GMT 12
why would the hirise carbs go to the bin, FI is not going to give an HP advantage to a well set up carb. it should be safe though when a car is upside down I’m no expert but why are modern cars EFI then? Fuel efficiency I guess. You don’t see many drift cars with carbs. One advantage for EFI would be when the car smacks the wall and stalls it won’t take so long to start. I guess one measure will be at the Nz tittle see how many in the top 10 are carb vs EFI Rule T12-2-49 (k) snz reserves the right to alter the restrictor plate size …. I wonder how often they will impose there right to do this. My guess as long as it takes them to work out how long to make the EFI go as good as a well set up carb
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Post by The Observer on Jun 9, 2022 19:30:22 GMT 12
I wonder if this will see the return of the Rover v8?
I like the idea of it being easier to start, but once my carb is warmed up it’s pretty easy
Modern EFI is used for fuel efficiency and safety and to get a nice torque curve through best fuel/air ratios
However most of those manifolds designed to deliver best hp and torque at lower revs.
Word on the street is the Falcons will likely get the most benefit given how far the fuel and air has to travel in those straight 6s
Will be interesting to see who makes the change.
If you were building a brand new car, or repowering you probably wouldn’t hesitate to keep the standard inlet manifold and go EFI
Cheaper and easier
It’s hard enough getting parts at the moment think carbs fall in the same category.
Hopefully this encourages the v8s to make a comeback in the stockcar class. Well, the ones with an EFI set up anyway
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Post by mudman on Jun 24, 2022 8:09:02 GMT 12
Can’t see carbs being hard to get in our life time. There’s still a huge demand for them in the states so for as long as that demand is there Holley, Weber, braswell, quick fuel, ect will be producing carbs so that isn’t an issue at all. Will be interesting to see how quickly snz move if they find efi to be at a huge speed advantage. With the first major title only being 4-6 weeks into the season (north island champs) it’s hard to see snz changing in that limited time but then nzs are only 4 weeks later with Xmas in between. IF efi proves to be the vastly superior option this is the year to purchase your 1nz before the rules get reigned in for parity.
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Post by Roxcyford on Jun 26, 2022 20:37:12 GMT 12
Can’t see carbs being hard to get in our life time. There’s still a huge demand for them in the states so for as long as that demand is there Holley, Weber, braswell, quick fuel, ect will be producing carbs so that isn’t an issue at all. Will be interesting to see how quickly snz move if they find efi to be at a huge speed advantage. With the first major title only being 4-6 weeks into the season (north island champs) it’s hard to see snz changing in that limited time but then nzs are only 4 weeks later with Xmas in between. IF efi proves to be the vastly superior option this is the year to purchase your 1nz before the rules get reigned in for parity. As mentioned in my earlier post, it ran like poo.
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Post by wildside on Jun 26, 2022 22:11:14 GMT 12
Didnt scott fredrickson trial this few years back??? If any think like minisprint 4age rules.. Restrictor plate on inlet cancels throttle body tampering.. Fuel pump only comes on when snz ecu live..so more safety , no separate fuel switch, so pump isnt buzzing away while stalled or up side down... Performance wise,you could match flow injectors etc,if valve lift rules etc all the same..itl just be easier starting ,id be suprised if theres any performance gain..especially due to oem exhaust manifold rules..thats where gains were made in the 4ages, as this open...
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Post by mudman on Jun 27, 2022 17:43:56 GMT 12
Efi holds a residual pressure of around 50psi even when the car is shut off so would hate to think about one of those lines cracking/coming loose in a crash would shoot fuel further then the super soaker 9000
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Post by The Observer on Jun 27, 2022 20:53:54 GMT 12
It’s going to be a funny old thing
You will probably see two groups with injected carbs
1) the brand new car brand new engine group
People with good budget will be fast because they have freshest new gear - shocks, springs, chassis, engine, and likely fuel injection
Be very quick and no doubt will have people saying make the injection restrictor plate smaller. These people will then probably convert to carbs and be just as quick
2) classic stockcar start up where you have a second (or 3rd or 4th or 20 year old) chassis, pick up second hand parts wherever possible, get a mean paint job and run out of cash so chuck a stock motor with fuel injection in
Finish half the meetings you start, hit a few people finally have a crack at a fast guy and get the payback and wonder why you moved out of streetstocks/mini stocks/production saloons/occasional derbies
The fuel injection will have made these cars more reliable, and easier to get going so you can focus more on stopping spinning out, fixing the gearbox that won’t stay in gear, clutch that won’t release all the way, axles that are too short for the diff, and trying to get brakes that work. These guys and girls won’t be winning races, and probably won’t change the restrictor plate when they are supposed too, as it won’t make a difference until the local hero scrutineers catches them out and we loose a competitor who chucks it in:
There is a 3rd group …
The guys who get carbs wiped out from racing and hope to save some money putting a standard manifold Back in the car
Maybe a 4th group - the ones thinking of upgrading to the Hi Rise carb and instead go to fuel injection as a cheaper change over
Unfortunately 2 and 3 and 4 unlikely to happen if the restrictor plate change happens.
Which is why I think the inclusion to allow to change the restrictor plate is a cop out.
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Post by mudman on Jun 27, 2022 21:48:51 GMT 12
I think you’ve missed a group. Those hard working tradesmen with mortgages and families who quietly improve their gear over a long career as money and time allow. Not rich men, not poor men. Guys who snag a win once or twice a year might still run a dizzy or basic snz computer. But cannot afford to make the change of buying new computers to run the efi, the new fuel pumps and lines and the time spent on a dyno with the lap top tuning. To me this is the back bone of the class they guys who celebrate tier 2 at the nzs the ones who can’t afford to throw away a working carb system but might have to if they want to hold their position as a 5th-10th runner. Also the fear that some have over the carb being wiped off the top of the engine is no less a factor with efi except instead of afuel line with 6psi fuel pressure you have one with upwards of 50.
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