Discussion
As has been said already space or length is your real problem. Inline 6 means long engine, the Mx-5 is gifted with width in the engine bay but limited length 
. If the later Jag V8 is going cheap it would be worth a try.
Anyway an engine transplant is going to require serious fabrication and mechanical skills or money.
. If the later Jag V8 is going cheap it would be worth a try.Anyway an engine transplant is going to require serious fabrication and mechanical skills or money.
HereBeMonsters said:
No it wouldn't. Jag engines (in the main) are built for lazy, effortless performance, completely the wrong sort of engine for an MX-5 in my opinion. Displacement doesn't necessarily mean massive power.
They do have a very flat torque curve, but this can be altered with some work and the engines love to rev. They can also cope with 600bhp on standard internals and will take a manual getrag gearbox.
But wouldstill require massive amounts of work to fit, if it would fit.
HereBeMonsters said:
No it wouldn't. Jag engines (in the main) are built for lazy, effortless performance, completely the wrong sort of engine for an MX-5 in my opinion. Displacement doesn't necessarily mean massive power.
I agree with you but it hasn't stopped people putting other V8's of similarly lazy character in their MX-5s. Seemingly moot now that we are actually looking at a supercharger transplant.Ah - so it's the supercharger from the 3.2 supercharged XJR?
In theory it would work, but you'd probably find it's too 'big' in that once running it will put too much air into the cylinders (twice as much as needed, in fact).
The 'usual' supercharger to use is the M45 from the Mini Cooper S (Mk1), or the M62 model that's fitted to various 2-litre Mercs (C200K etc). I've just got curious and the Jag uses an M90 - so that's exactly twice as much airflow at the M45. You'd need to put so much petrol in it to make it run at all that it'd be undrivable
In theory it would work, but you'd probably find it's too 'big' in that once running it will put too much air into the cylinders (twice as much as needed, in fact).
The 'usual' supercharger to use is the M45 from the Mini Cooper S (Mk1), or the M62 model that's fitted to various 2-litre Mercs (C200K etc). I've just got curious and the Jag uses an M90 - so that's exactly twice as much airflow at the M45. You'd need to put so much petrol in it to make it run at all that it'd be undrivable
Gizmo! said:
Ah - so it's the supercharger from the 3.2 supercharged XJR?
In theory it would work, but you'd probably find it's too 'big' in that once running it will put too much air into the cylinders (twice as much as needed, in fact).
The 'usual' supercharger to use is the M45 from the Mini Cooper S (Mk1), or the M62 model that's fitted to various 2-litre Mercs (C200K etc). I've just got curious and the Jag uses an M90 - so that's exactly twice as much airflow at the M45. You'd need to put so much petrol in it to make it run at all that it'd be undrivable
You can adjust how much air a supercharger pumps by increasing the crank pulley/reducing the nose pulley on the charger, so "putting too much air into the cylinders" isn't the issue. The issue is that larger chargers take more power to run, so unless you're going for serious power (well over 250 bhp), an M90 is far from ideal and you'd be better off with the more usual MP62.In theory it would work, but you'd probably find it's too 'big' in that once running it will put too much air into the cylinders (twice as much as needed, in fact).
The 'usual' supercharger to use is the M45 from the Mini Cooper S (Mk1), or the M62 model that's fitted to various 2-litre Mercs (C200K etc). I've just got curious and the Jag uses an M90 - so that's exactly twice as much airflow at the M45. You'd need to put so much petrol in it to make it run at all that it'd be undrivable
Gizmo! said:
Ah - so it's the supercharger from the 3.2 supercharged XJR?
In theory it would work, but you'd probably find it's too 'big' in that once running it will put too much air into the cylinders (twice as much as needed, in fact).
The 'usual' supercharger to use is the M45 from the Mini Cooper S (Mk1), or the M62 model that's fitted to various 2-litre Mercs (C200K etc). I've just got curious and the Jag uses an M90 - so that's exactly twice as much airflow at the M45. You'd need to put so much petrol in it to make it run at all that it'd be undrivable
Thank you for the input, that has solved it, i shall not buy the jag lump! Now, need to find a mini or a merc! Any input on the begi shanghai turbo starter kit. trying to keep options open, but dont really want to spend more than what i paid for the car!! (1600) Any help would be much appreciated! In theory it would work, but you'd probably find it's too 'big' in that once running it will put too much air into the cylinders (twice as much as needed, in fact).
The 'usual' supercharger to use is the M45 from the Mini Cooper S (Mk1), or the M62 model that's fitted to various 2-litre Mercs (C200K etc). I've just got curious and the Jag uses an M90 - so that's exactly twice as much airflow at the M45. You'd need to put so much petrol in it to make it run at all that it'd be undrivable
I think the real challenge is sorting out the fuelling and ignition control. The kits include dummy throttle bodies, piggy back ECU's, standalone ECU's etc as well as the charger itself. You might get a cheap charger and then blow a load of cash on the rest or blow the engine running it lean or knocking.
Oldandslow said:
I think the real challenge is sorting out the fuelling and ignition control. The kits include dummy throttle bodies, piggy back ECU's, standalone ECU's etc as well as the charger itself. You might get a cheap charger and then blow a load of cash on the rest or blow the engine running it lean or knocking.
Cheers, looks like i will have to make do with my 130 ponies!! Damn, oh well, just hope i dont see my friends rx-7 for a while! Jammy b
d gets gets a 400bhp monster brought for him, not that he can afford to run it. how many of you are still running non FI lumps?Embarassed to say that I've been running a 115hp Eunos for 8 years. I've got a turbo kit that's been sitting in a box for a few years now. I still find the car loads of fun and I'm just a bit scared I'll wreck it with a turbo. My latest daily car is a Legacy B4 which has introduced me to the thrills of turbo. So I'll get the MX5 MOT'd for April and then see about fitting the kit. Maybe
Oldandslow said:
Embarassed to say that I've been running a 115hp Eunos for 8 years. I've got a turbo kit that's been sitting in a box for a few years now. I still find the car loads of fun and I'm just a bit scared I'll wreck it with a turbo. My latest daily car is a Legacy B4 which has introduced me to the thrills of turbo. So I'll get the MX5 MOT'd for April and then see about fitting the kit. Maybe
Or...... you could sell me the kit at a huge discount and feel really good that you have helped out a fellow PHer!! hahaha. i have to use mine as an everyday car, no real distance but would be nice to have a few extra horses!!Oldandslow said:
Embarassed to say that I've been running a 115hp Eunos for 8 years. I've got a turbo kit that's been sitting in a box for a few years now. I still find the car loads of fun and I'm just a bit scared I'll wreck it with a turbo. My latest daily car is a Legacy B4 which has introduced me to the thrills of turbo. So I'll get the MX5 MOT'd for April and then see about fitting the kit. Maybe
Wreck it how? Too much awesomeness??Gizmo! said:
Ah - so it's the supercharger from the 3.2 supercharged XJR?
In theory it would work, but you'd probably find it's too 'big' in that once running it will put too much air into the cylinders (twice as much as needed, in fact).
The 'usual' supercharger to use is the M45 from the Mini Cooper S (Mk1), or the M62 model that's fitted to various 2-litre Mercs (C200K etc). I've just got curious and the Jag uses an M90 - so that's exactly twice as much airflow at the M45. You'd need to put so much petrol in it to make it run at all that it'd be undrivable
There's an awful lot wrong in this post.In theory it would work, but you'd probably find it's too 'big' in that once running it will put too much air into the cylinders (twice as much as needed, in fact).
The 'usual' supercharger to use is the M45 from the Mini Cooper S (Mk1), or the M62 model that's fitted to various 2-litre Mercs (C200K etc). I've just got curious and the Jag uses an M90 - so that's exactly twice as much airflow at the M45. You'd need to put so much petrol in it to make it run at all that it'd be undrivable
Can you quantify why the supercharger from an XKR puts 2times too much air into an MX5 engine?
The MINI supercharger is an MP45, there's quite a few of these kits fitted to an MX5 now since Barry developed his kit. However, the M45 is the most common supercharger used on the MX5. Origionally developed by Sebring, it's been sold under many banners, including MazdaSpeed, but the most ubiqutious is JacksonRacing.
The are no M62's fitted to an MX5 to my knowledge - and if there are I suspect they could be counted on 1 hand. The MP62 was/is a very popular kit, originally developed by BRP, who then went bust and sold to SOT, who then when bust and sold to FlyinMiata, who no longer sell the kit. The MP62 kits do not use the supercharger from various Mercs. For info the M62, (note the missing 'P'), that are fitted to various Mercedes have a clutch to engage and disengage the supercharger from the crank, they're very different to the MP62.
I've seen the M90 fitted to a few MX5's and by all accounts it works quite well, though at full chat it does draw more power to turn it than the smaller M/MP45/62 models. The MP62 for reference uses about 25-30bhp to turn it at the MX5 engines redline. This is why (amongst many other reasons, but for now I'll keep it simple), an MP62 at 10psi will make roughly 30bhp less than a.n.other turbo at 10psi.
I'm not sure where the 'You'd need to put so much petrol in it to make it run at all that it'd be undrivable' has come from as that is total and utter b
ks.Richyvrlimited said:
This is why (amongst many other reasons, but for now I'll keep it simple), an MP62 at 10psi will make roughly 30bhp less than a.n.other turbo at 10psi.
Don't keep it simple. I've always wondered why a different sized turbo (or supercharger) makes more / less power at the same boost?Mr MXT said:
Richyvrlimited said:
This is why (amongst many other reasons, but for now I'll keep it simple), an MP62 at 10psi will make roughly 30bhp less than a.n.other turbo at 10psi.
Don't keep it simple. I've always wondered why a different sized turbo (or supercharger) makes more / less power at the same boost?A turbocharger is driven by the exhaust gases from the engine, so doesn't directly draw power from the engine.
Hence with all other things being equal, psi for psi, the turbocharged engine will normally make more peak power than the supercharged one.
There is also volumetric efficiency of the charger itself to be considered, some turbo or superchargers are more efficient at compressing air than others, I believe some types of superchargers are less efficient than a turbocharger whilst other superchargers are as or more efficient as a turbocharger.
In layman's terms I believe more efficient chargers can compress large amounts of air without heating it up as much as a smaller charger would. So, one small turbocharger might produce 20 psi of pressure in an inlet manifold at 5,000 rpm just as a larger turbocharger could, but the air in the manifold from the larger turbocharger would be cooler and hence have more oxygen content, hence allowing the engine to produce more power.
Edited by youngsyr on Monday 21st March 13:49
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