Supercharged?

Discussion and technical advice for 84-89 AW10 & AW11 MR2. 3A-LU, 4A-GE, 4A-GZE.

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Negativvv

Re: Supercharged?

Post by Negativvv »

I watched Marts vid and the sc sounded a bit "weeeeeee" like a mosquito :shock: Im sure thats the sound recording equipment tho and it sounds alot deeper to ur own ears!

The n/a is too similar in power to the Ford Puma i owned for 2 years, Puma 1.7 had 123bhp and 110ft of torque (but at lower rpm). It revved to 6500 unlike 7900 tho and Ford ran out of money when engineering the gearbox as they had to limit the torque in 1st and 2nd or it would blow up :roll:

n/a isnt "slow" but u have to press on to make it "fast :(

Im not looking for silly power as in a 1.5 so im thinking a sc with a pulley will be "sufficient" :roll: The idea of something with monster power/weight ratio is tempting tho if irresponsible :mrgreen:

Oh and Anglesey is a bit far :(
SySanguinary
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Re: Supercharged?

Post by SySanguinary »

anna wrote:come to anglesey :)

There will be SC's and NA's going round the track, and grabbing a passenger ride shouldn't be a problem.


And a 1.5!!!!

Having said that the engine is still on the floor......Lots to do. :D
Tiamat
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Re: Supercharged?

Post by Tiamat »

SySanguinary wrote:
anna wrote:come to anglesey :)

There will be SC's and NA's going round the track, and grabbing a passenger ride shouldn't be a problem.


And a 1.5!!!!

Having said that the engine is still on the floor......Lots to do. :D


You not finished that yet? Or is Kirtsy still trying to push it off the axle stands...?
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nicedude1976
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Re: Supercharged?

Post by nicedude1976 »

Negativvv wrote:Ive done 6 cylinders on a previous car! Straight 6 tho not V but better imo :oldtongue:

Was it in an MR2 mk1 ?
Squizz

Re: Supercharged?

Post by Squizz »

What's the best exhaust option for an SC car?

Same as the N/A, or something with a larger bore like a turbo'd car?

Just wondering as we *should* be using an SC for racing next year, and maximising what little power we have would be nice! :roll:
Charged
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Re: Supercharged?

Post by Charged »

Squizz wrote:What's the best exhaust option for an SC car?

Same as the N/A, or something with a larger bore like a turbo'd car?

Just wondering as we *should* be using an SC for racing next year, and maximising what little power we have would be nice! :roll:


Most people stick with the mongoose/magnex exhausts like the NA
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MartG
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Re: Supercharged?

Post by MartG »

Should be fine with a Magnex/Mongoose same as the NA, and not too noisy ( mine generally came out at around 93dB )
Squizz

Re: Supercharged?

Post by Squizz »

Hokey Cokes, cheers. :thumleft:

Don't actually know what's on it at the moment... Could prove interesting.

Edited to add:

Our current N/A racer has a Magnex system on it. It's fairly quiet but bloody heavy. Might be a tad restrictive compared to some of the simpler systems used by other racers.
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Re: Supercharged?

Post by MartG »

It there a noise limit for the Nippon Challenge, or for any of the circuits you'll be racing at ?
Negativvv

Re: Supercharged?

Post by Negativvv »

Magnex zausts aint heavy! OEM is heavy!!! :shock:
Squizz

Re: Supercharged?

Post by Squizz »

MartG wrote:It there a noise limit for the Nippon Challenge, or for any of the circuits you'll be racing at ?


Most circuits limit noise to 105db for racing. (Static test). Dunno if Castle Combe is lower though.

Current MR2C car is okay for weight, we don't want to lose any more. For the Nippon Challenge racer anything is fair game. So I'll be interested to see what system it has and whether we can replace it with something that will gave a performance increase and reduce weight. :-k
Tiamat
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Re: Supercharged?

Post by Tiamat »

Squizz wrote:
MartG wrote:It there a noise limit for the Nippon Challenge, or for any of the circuits you'll be racing at ?


Most circuits limit noise to 105db for racing. (Static test). Dunno if Castle Combe is lower though.

Current MR2C car is okay for weight, we don't want to lose any more. For the Nippon Challenge racer anything is fair game. So I'll be interested to see what system it has and whether we can replace it with something that will gave a performance increase and reduce weight. :-k


105 static?
Where?

Every place I have enquired has been something like 98/101 for static and its normally 105 drive by.
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MartG
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Re: Supercharged?

Post by MartG »

Tiamat wrote:

105 static?
Where?

Every place I have enquired has been something like 98/101 for static and its normally 105 drive by.


105 for race meetings - trackday noise limits are generally much lower
Tiamat
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Re: Supercharged?

Post by Tiamat »

MartG wrote:
Tiamat wrote:

105 static?
Where?

Every place I have enquired has been something like 98/101 for static and its normally 105 drive by.


105 for race meetings - trackday noise limits are generally much lower


Cool, I might pass that!
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bburn13
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Re: Supercharged?

Post by bburn13 »

Negativvv wrote:Good to see im normal (atleast in this company) when i say i hanker after the sc whine 8)

Having something with forced induction is on the list of "thing to do before i die":oops:

Wil,
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They are going for peanuts at the moment.
I honestly believe that this will change soon and they will soar in price.
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Mk1 Turbo Powered Steve
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Re: Supercharged?

Post by Mk1 Turbo Powered Steve »

OK! i haven't read all the posts on here, i'm being lazy as ever but from my experience the standard sc is'nt much faster than an na!
Get the bigger pulley fitted and it makes a massive difference!

I was very pleased with mine and beats loads of newer cars but have now come to the point where i need more power, that's why i'm doing the 1.5
weegaz22

Re: Supercharged?

Post by weegaz22 »

id go 1.5...but im biast :mrgreen:
TheCraig

Re: Supercharged?

Post by TheCraig »

Negativvv wrote:
n/a isnt "slow" but u have to press on to make it "fast :(

Im not looking for silly power as in a 1.5 so im thinking a sc with a pulley will be "sufficient" :roll: The idea of something with monster power/weight ratio is tempting tho if irresponsible :mrgreen:


Negativvv you could consider a 20v conversion. When complete my black top conversion should have about 170 bhp and 120lb/ft of torque and not weight any more than the 16v. If I keep it off the vvt will get better fuel economy as well.

The parts are a little harder to source but that's just another challenge to over come in my mind.

Oh and they rev to 9000 rpm :twisted:
weegaz22

Re: Supercharged?

Post by weegaz22 »

Negativvv wrote:Ive suddenly found the urge to partake in some Forced Induction ownership :shock:

Basically i fancy a Super Charged mk1 or possibly a mk 1.5 if i can work out the logistics of building one.

Was a SC i was mildly interested in on the 'bay but the auction ended with only me and it didnt hit the reserve. It looked like a possible shed tho (no offensive if its sum1s car on here!!), it had a cooling leak somewhere and a pulley for more power. Also found from the owner it was imported here very early in its life and was an early sc too (89 and 87 respectively)

I probably wont do a mk1.5 as my current mk1a isnt the best shell ive seen altho its not falling apart either.

The questions i have is how much difference is there between an sc and an n/a? A friend thinks i shouldnt waste my time as the bhp gain is only modest but the torque gain is pretty big! While i dont find the n/a slow as such, it isnt exactly fast either!

Oh and how different does the sc sound? Its important that i can hear the sc whine a bit... :eye:

Thanks!


i would still consider a mk1.5 as an option, you already have a mk1, so the money you would be forking out for a supercharger could go towards a tubby rear clip, they can be had from £700 upwards and that will give you majority of bits you need

buy a few tools and a welder if you dont have one already, get your shell sorted to take the extra power(which you would want to do anyway to keep it roadworthy) you said its not that bad so should be fine

sc lumps are still fetching £800-£1000+ on ebay which makes the 1.5 conversion good value for money



craig isnt 120ft/lbs not far off stock? sounds like all the 20v head is doing is shifting the peak power further up the rev range without really giving you much of a gain, bit like a bike engine, low torque but plenty of bhp cos they can rev to 13-15k

and how much is a 20v conversion to do?
Negativvv

Re: Supercharged?

Post by Negativvv »

I have been thinking about the 1.5 conversion and currently im leaning towards the sc as...

A) My current shell isnt mint

B) The costs will probably mount up and after ive done the suspension, brakes/random fabrication. Id probably be better off hunting for a solid sc!

C) Im a t@rt and want air con, almost all sc have them and i get one that i could get working again/has it already working!

D) The mk1 will be off the road for weeks or longer as im spending time building it!

E) How much power does anyone "really" need anyway? :lol: Power to weight ratios approaching junior supercars is a bit naughty anyway! :whistle:
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