Technical bottom end swap/upgrade

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Technical bottom end swap/upgrade

do you refer to the 2.0 HGT engine?

If so then they are the same engine, straight 5 cylinder

the difference with the 155bhp is that it has a variable intake system to provide optimal intake length and diameter at higher and lower rpm

It also has an electronic throttle system.
 
ah right cool,so thats 2 replys sayin yeah it will fit
..simple reason i ask,.is cus a lad from near me sed i cant as my car is the s1 and the 155 version is the s2 and is different engine or sumthin..:confused:
im not exactly a mechanic but i pretty much fort they wud fit myself as it is the same engine..just easier to get more power gains startin from the 155 version..i got offered one for £90 thats all.

Cheers Mike :cool:
 
hi guys,just wonderin what i will need or connect up etc in order to fit the 155 bottom end etc.as i am goin 2 get that engine i got offered..or is it just a straight swap?
Help appreciated..

Cheers Mike
 
ah right cool,so thats 2 replys sayin yeah it will fit
..simple reason i ask,.is cus a lad from near me sed i cant as my car is the s1 and the 155 version is the s2 and is different engine or sumthin..:confused:
im not exactly a mechanic but i pretty much fort they wud fit myself as it is the same engine..just easier to get more power gains startin from the 155 version..i got offered one for £90 thats all.

Cheers Mike :cool:


The power gains considering an engine swap are minimal. Side by side there is little difference between the two. The 155 has better low down torque so is a little less effort. Although the 155 is more tunable.
personally your money would be better spent on a suspension kit etc.

Just my opinion though.
 
hi guys,just wonderin what i will need or connect up etc in order to fit the 155 bottom end etc.as i am goin 2 get that engine i got offered..or is it just a straight swap?
Help appreciated..

Cheers Mike
 
hi mike, shaun here :)

the 155 and 147 is the same, they thing i was wondering about was the ecu. with it being a mk2 i dont think itll work on ur mk1 ecu. unless u get a ecu and immobilizer the lot for ur 155 enigne
 
If it is just a bottom end you are after then they are the same (exactly the same) So no point swapping unless your engine is worn on the bottom end.

As the 155 is fly by wire and has a totally different ecu then No. It wont be a straight swap to replace entire engines. As Shaun says you would need the 155 ecu, code box etc.

hope this helps
 
im not exactly a mechanic but i pretty much fort they wud fit myself as it is the same engine..just easier to get more power gains startin from the 155 version..i got offered one for £90 thats all.
you wont get any power gains from the bottom end, they are exactly the same.

the power and torque difference is from the ecu's fueling and ignition map and the variable cam timing. none of that has anything to do with the bottom end. you would need to fit the head and ecu, but then you also need to fit the other bits and bobs to support it such as the loom and the fly by wire accelerator pedal arrangement and the throttlebody etc.
 
you wont get any power gains from the bottom end, they are exactly the same.

the power and torque difference is from the ecu's fueling and ignition map and the variable cam timing. none of that has anything to do with the bottom end. you would need to fit the head and ecu, but then you also need to fit the other bits and bobs to support it such as the loom and the fly by wire accelerator pedal arrangement and the throttlebody etc.

ahhhh get ya's now,sorry :eek:
ah well neva mind hey.just dont really wana spend like £200+ on gettin it chipped etc an only comin out wiv say 155bhp..just fort i may aswell get the 155 engine an go from there thats all..

Cheers,Mike (y)
 
at the end of the day if u chip it, even if u get an extra 5-6% extra, ull feel it. the torque will go up. and ur acceleration will spread more accross the dial.

id say give her a good service, get a BMC CDA and chip it...will be enough i recon :) or u can go full out and supercharge it
 
at the end of the day if u chip it, even if u get an extra 5-6% extra, ull feel it. the torque will go up. and ur acceleration will spread more accross the dial.

id say give her a good service, get a BMC CDA and chip it...will be enough i recon :) or u can go full out and supercharge it

its not long had a full service tbh,had new tyres,discs,pads,oil,filter and also a new cat when it went in for its mot 3 months ago so its all good :)
Gona get it chipped eventually i think,like a sed earlier on,just gona see what i can get out of this engine at the mo..
Cheers :cool:
 
its not long had a full service tbh,had new tyres,discs,pads,oil,filter and also a new cat when it went in for its mot 3 months ago so its all good :)
Gona get it chipped eventually i think,like a sed earlier on,just gona see what i can get out of this engine at the mo..
Cheers :cool:

chipping it is one of the last items as far as engine tuning go. the chip ideally needs something to work with. Cams, exhaust, manifolds etc.

Performance wise I dont think tuning a car thats putting out 147bhp you will notice 5-8 odd extra bhp if a tuned car and non tuned were against each other.
However you might notice more torque and better pull in certain conditions.

My Coupe Turbo is running 30bhp over standard yet along side a non modded one there isnt much in it.
 
To answer your thoughts Mike, probably best to sort the engines breathing out. Some better cold air feeds to the air box with either a panel or cone filter element. A cat back exhaust system. If you wanted more power but at a cost of less torque then removing the cat and possibly a faster flowing exhaust manifold would be the answer. Then possibly uprated cams. This would then need some sort of tweaking the ecu to uprate fuel and air ratio's

It all depends what power you want.
Most bigger bhp increases come at a loss of low down torque. Unless you are running a turbo or supercharger.

Just re read my last post. What I meant to say regarding chipping is that you as a driver will definately feel the difference although chips work better with mods.
Just that if you had two identicle cars and one had a 10bhp advantage then in real world terms there would not be a huge amount of difference if both were put head to head.
 
To answer your thoughts Mike, probably best to sort the engines breathing out. Some better cold air feeds to the air box with either a panel or cone filter element. A cat back exhaust system. If you wanted more power but at a cost of less torque then removing the cat and possibly a faster flowing exhaust manifold would be the answer. Then possibly uprated cams. This would then need some sort of tweaking the ecu to uprate fuel and air ratio's

It all depends what power you want.
Most bigger bhp increases come at a loss of low down torque. Unless you are running a turbo or supercharger.

Just re read my last post. What I meant to say regarding chipping is that you as a driver will definately feel the difference although chips work better with mods.
Just that if you had two identicle cars and one had a 10bhp advantage then in real world terms there would not be a huge amount of difference if both were put head to head.


yeah im gona get a cold air feed going up to it,possibly 2 if i can get 1 either side,its got a k+n cone filter on it (still got the original air feed pipe there,)..and the exhuast system is a cat back one,its a 3" Scorpion with twin exit tail pipe..
ive been looking round for cams and manifolds but cant seem to find nought,,(probably just me not looking in the right places lol)

Cheers :cool:
 
been doing some surfing for a while now and still cant seem to find any uprated cams for my car..BUT i did come across a site were sum1 fitted a coupe turbo head and cams into his stilo..:confused:
would i be able to use these on mine in order to get more power,also i bin told to get a fuel rail aswell for more power..
any help on uprated bits and advice welcome..
Cheers
Mike
 
If you put a coupe Turbo head on the stock HGT then it would be technically possible. You would need to reduce compression as the Turbo runs different stronger pistons that give a lower compression ratio.

If you did not reduce compression then the pistons would put the gases in the cylinder under soo much pressure that compression through massive heat build up could occur just before the cylinder has completed its upwards stroke. Basically exploding/combusting before the point where the spark plugs ignite the fuel.
The resulting explosion would try to force the piston down before it had reached the top, whilst the crank was still trying to bring it up. The result would be a blown up piston or rod.

Also the car would need detuning as stock pistons might be pushed running higher bhp. The clutch would certainly struggle under the torque.

you would also need a piggyback device of sorts on the ECU to regulate the fuelling.

The coupe head should be used with its injectors.

Would be much easier and better to do what bulldog has done and transplant a coupe turbo engine/gearbox, plus ECU.
 
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