Injectors or carbs

3rd June 2008, 12:56

i have a vtr and after either adding an injector or going for carbs which one is best for now? where would i be able to buy an extra injector from?

3rd June 2008, 13:03

why are you wanting to add another injector? are you going boosted?

carbs are a big back wards step in engineering.

3rd June 2008, 13:20

i was told you can add a 5th injector to add on tuning, and motorbikes carbs are supposed to be a sh*t load lighter and allow more fuel to pass through just idea and would like to know which is best and any recomendations

3rd June 2008, 13:30

What's your current spec? And budget?

3rd June 2008, 13:30

adding a 5th injector and totally removing the whole system in exchange for carbs is different.

never heard of people running 5th injectors on a std vtr, dont see a point really either, you will just overfuel in most cases.

bike carbs ive seen many that loose power.

3rd June 2008, 13:35

Quote:

Originally Posted by Ryan

adding a 5th injector and totally removing the whole system in exchange for carbs is different.

never heard of people running 5th injectors on a std vtr, dont see a point really either, you will just overfuel in most cases.

bike carbs ive seen many that loose power.

agree there.
no need for a 5th injector and even if you force ind. 5th injector still isnt the proper way to do it.

bike 'carbs' that people use is just to cut corners and do it cheaper then buying full ITB.
the bike 'carbs' still have injectors but there just like ITB.

to properly carb a car you need to get an engine management that does just ignition.
then youd need to take all the standard injection off,decide what carbs your gonna go with get a custom manifold done,then spend hours and hours on a dyno tuning jets sizes.

why not do it properly and get ITB for cars with injectors and get a standalone ecu and get it mapped properly?

theres no point in doing that though unless you got head work and cams though.

3rd June 2008, 13:38

wtf is "cam work"? lol.

3rd June 2008, 13:40

Quote:

Originally Posted by Karl

wtf is "cam work"? lol.

some people get re-grinds lol.

nah i meant cams,and head work,hold on

there wtf you on about ya nutter lol

3rd June 2008, 13:43

my budget is about 1500 i have a piperx induction kit crankcase breather and a backbox

3rd June 2008, 13:43

You mean they get their cams reprofiled.

3rd June 2008, 13:44

Quote:

Originally Posted by Saxo_s7evo

my budget is about 1500 i have a piperx induction kit crankcase breather and a backbox

spend it on brakes and suspension.

3rd June 2008, 13:52

Quote:

Originally Posted by Saxo_s7evo

my budget is about 1500 i have a piperx induction kit crankcase breather and a backbox

1500?

give your car a service using decent stuff.

get better tyres,better pads,disks

get rid of the piper cross and get atleast a raceland induction kit with green filter.this also has a add on so you dont have to use the stupid crancase breather filter you got.

and youd probably still have 700 or more quid left
upgrade suspension.billie shock are best
pads are pagid,mintex or ferrodo.

do that and the car will feel good.

3rd June 2008, 14:24

with the raceland there are loads of work to fitting it isnt there?

4th June 2008, 06:56

Quote:

Originally Posted by littleracer

agree there.

bike 'carbs' that people use is just to cut corners and do it cheaper then buying full ITB.
the bike 'carbs' still have injectors but there just like ITB.

bike carbs dont have injectors, as they are carbs

4th June 2008, 07:35

extra injectors are about getting more fuel into the engine.. i've always considered this method to be a botch as most of the time the correct choice of 4 injectors and an aftermarket ECU will be superior (with a decent map)

Carbs are a huge backward step. Why go from a fully mappable fuel / ignition curve to anything else? With a 1500 budget you are just about putting enough together for one of the cheaper throttle body kits. Its the mapping though that would put it currently over budget.

As someone else has already posted. The fastest car is never the one with the most bhp.. its the one with the best chassis / suspension setup (and the most bhp)

There is no point in going fast in a straight line (unless you live your life a quarter of a mile at a time) if you are as fast as the standard VTR on the corners. I could recount a story about me driving a car with 75bhp and 3 K spent on suspension overtaking a car with a 90bhp performance advantage but I'll save that for bedtime

4th June 2008, 07:52

you do get good results with carbs. used a lot on XEs and i've seen a few cvh's with them.
not uncommon for XEs to be 200hp with carbs and cams.

4th June 2008, 07:54

Quote:

Originally Posted by williamsvts

you do get good results with carbs. used a lot on XEs and i've seen a few cvh's with them.
not uncommon for XEs to be 200hp with carbs and cams.

Yes, carbs can give some good results, but never seen them on a tu engine before...

4th June 2008, 09:54

Plenty of people have used carbs on the TU in the past. Though they have gone out of favour for very good reason.

My experience from going duel twin choke to throttle bodies was:
There was a noticeable yet not massive increase in power.
Idle speed drop significantly and was much smoother.
Low down power was massively improved as the car did not bog down.
Fuel consumption dropped considerably.
Most shockingly my fuel race engine could suddenly scrape through a MOT well sort of.
Most importantly do to the advantages above I later managed to run a MUCH wilder can and got even more power.

I should add one think that people tend to forget with these cars. Twin choke side drafts to not fit these cars. Yes you can twist everything about and or put tiny ram pipes on and tiny air filters but it simply does not work as it should. It has been tried many a time and even on left had drive cars that have a lot more space there still so limiting that there really not the answer. Carbs are so much more picky about induction length, air flow and pulse waves. If you want to go carb its a matter of twin IDF with the ram pipes out the top of the bonnet or bike carbs with a big hole cut in your scuttle. Though its a hell of a lot easier and costs similar money to get fuel injection.

PS to get the equivalent efficiency as a XE with 200bhp in a VTS engine there would be no need to put a throttle body kit or carbs on it as the standard system is more than adequate.