39 replies to this topic

[oliver122]

http://cgi.ebay.co.u...T#ht_500wt_1156

would this be a good buy if i was looking into the turbo option , as there seem a few turbo's on ebay , but is sourcing the turbo the main problem or the carb ? as there seems be different options for the turbo , T2/T3/GT17

this is a list i have seen on a pdf wil_h has made , when he did the 20hour turbo conversion:

Turbo Garrett T2 (Renault 5)
Mirage manifolds
12G295 head (standard 28cc chambers)
Metro turbo Carb and manifold
Metro Turbo fuel pump
Metro turbo fuel pressure regulator
Oil return parts
Oil feed pipe
Actuator
Intercooler and pipes

[surfblue63]

Supercharger, less heat and no lag.

[mini_mad69]

Supercharger, less heat and no lag.

Apart from all the heat they pump into the engine because of the lack of intercooler on the common suck through setup.

And as mentioned, the correctly chosen turbo will produce minimal lag, and a more efficient engine.

[Wil_h]

Supercharger, less heat and no lag.

I think you mean MORE heat. And all cars have lag, even normally aspirated. try it yourself; get in an NA cardrive at say 30mph then put your foot flat to the floor, is there an instant reaction? no, this is lag, all cars have it.

What you are talking about is boost threshold, i.e. the low part of the rev range where no boost is made. superchargers also suffer this to some extent.

[hawky443]

i am no expert but i worked with VW.

i remember selling the Golf GT its a 1.4TSI Turbo Supercharged Injection

i know the supercharger kicked in at low revs and the turbo higher up the chain?

correct me if im wrong but i think its what you do with the car, if you want to smoke somthing off the line then supercharge it!
as im typing this im slowly thinging im talking crap.....

please correct me if im wrong??

[TopCatCustom]

What you are talking about is boost threshold, i.e. the low part of the rev range where no boost is made. superchargers also suffer this to some extent.

I can be driving my blown mx5v8 at about 2000rpm, pedal to the metal and it is like a bomb going off, if the back doesn't let go I'm lucky- even from those low revs, so I think the general view that superchargers do not suffer from lag is true.

I'm not saying they are better, but you seem to put supers down for any reason! The lack of boost at low revs is only really true with centrifugal superchargers, which are like big belt driven turbos, Spitfires used to have them fitted.

[hawky443]

il be honist i prefer a supercharger, Noise and power from low revs is better

[johnnysti]

Supercharger, less heat and no lag.

When i had my charger as a suck through, it use to be hot enough to fry an egg!! I know it was over the manifold but even so, silly ammounts of heat!

The blow through stays nice and cool and using an intercooler only helps keep the charge as cool as possible. But there is no getting away from it, compressing air will generate the dreaded heat. Its finding the best way of dealing with it.

[Wil_h]

What you are talking about is boost threshold, i.e. the low part of the rev range where no boost is made. superchargers also suffer this to some extent.

I can be driving my blown mx5v8 at about 2000rpm, pedal to the metal and it is like a bomb going off, if the back doesn't let go I'm lucky- even from those low revs, so I think the general view that superchargers do not suffer from lag is true.

I'm not saying they are better, but you seem to put supers down for any reason! The lack of boost at low revs is only really true with centrifugal superchargers, which are like big belt driven turbos, Spitfires used to have them fitted.

I did say to some extent and I was talking about boost threshold not lag, i.e if it dosen't make full boost at 1rpm over tickover it has a boost threshold. My wifes 500 Abarth has full boost at 1500rpm, it's truely amazing, infact you wait less time for boost in it than in a S1 MINI Cooper S (the standard one I drove anyway).

ALL cars have lag, this defined as the time between you putting you foot down and the engine responding, it may be small but it's there. The term is confused on turbo cars as they seem to do nowt when below the boost threshold. It is true however that lag will be bigger, whether it is noticable or an issue depends on lots of things.

It's a fact I don't like supercharges and I wouldn't advise anyone to use one as IMO there are better solutions, all solutions have compromises of course and you make decisions on what you want. the slightly lower boost threshold of a supercharger does not for me compensate its inefficiencies elsewhere.

[Jacko-lah]

Make a super charged turbo!

since no one has made on yet ):

When I was a Garrett, some clever bod patented a hybrid thing, which basically was 2/3's Turbo and a bit Charger.

If you imagine that a Supper Charger is a powered by the belt that is driven by the crank rotation, which turns a shaft which is attached to a compressor wheel, which compresses the air, and puts in more OXYGEN so you get a cleaner burn.

And a Turbo, uses exhaust gases (and heat) to turn a Turbine wheel, which is attached to a shaft which turns the compressor wheel, which compresses the air.

This Guys invention had the Turbine Wheel Driving a shaft, which drove a gear which drove the crank, so that the waste energy in the exhaust, applied a force to turn the crank. Given that the Design Engineers had a minimum number of patentents they had to produce per year it may not actually have been a comercial or technically good idea.