Restrictors

Larosto · Post by **Larosto** » Wed Feb 07, 2007 5:03 pm

Hello,

does anybody know more about the restrictors which were fitted in the manifold? When cleaning the carborettors I saw that they were removed.
I know, they should decrease engine power. But what`s about fuel consumption? Is it getting worse ? What about the torque of the engine? Is it getting better? Would it make sense to refit restrictors? Should the needle in the carb be the same with or without restrictors, or should another be fitted ?
Who has expirience?

regards

Horst

gary_in_nz · Post by **gary_in_nz** » Fri Feb 09, 2007 4:46 am

hi,

I'm planning on removing mine some time over the next couple of weeks, and will let you know how the fuel consumption goes. At the moment i get around 22L per 100km/s around 230-240kms per tank of 50L.

gary

gary_in_nz · Post by **gary_in_nz** » Sat Feb 10, 2007 3:05 am

Just found some spare time today and removed my carb and went to remove the restrictor plate and it does not want to budge after being hammered/chiselled. I didnt think it would be that hard or are these press fitted in the manifold??

Is there any special technique to this or is it a 'keep beating' until they do want to pop out.

Do let me know where I am going wrong!!!

thanks,
gary

gary_in_nz · Post by **gary_in_nz** » Tue Feb 13, 2007 4:18 am

hi,

finnally got the restrictors out, my oh my now we have some grunt, it pulls like a school boy now!!

I should have removed them along time ago.

Fuel consumption my increase a little but thats because it reaches higher RPM faster than with them in.

Torque decreases a little, due to, there is not as much of a rush of air going through the small holes like at lower rpm, but this gives you more power up in the higher RPM range. Torque is not really an issue any way with a V8 as they have much more torque than most other road going motors.

The abillity to use the engine as a brake also decreases.

I highly recomend leaving the restrictors out, with the gains in power its more than worth it to use a little more gas (as these already get there fair share of fossil fuels anyway) and these motors have still a lot of torque, especially with the LandRover gearing.

Well thats what i have noticed from 2 days driving without my restrictor plates in.

Cheers,
Gary

Larosto · Post by **Larosto** » Tue Feb 13, 2007 8:42 pm

Thanks for all the answers. Seems to be better if the restrictors are not refitted. I`ve got abook with some tests: ARange Rover with 135 hp compression ratio 8,13:1 does 22liters per 100 km, when running about 120 km/h. A Stage One does 16 liters per 100 km, with the same engine but restrictors fitted. The test says, that a Stage One reaches it`max.torque at 2000 rpm, a Range at 2500 rpm.
I must think it over.

Horst

Larry · Post by **Larry** » Tue Feb 27, 2007 12:15 pm

I had the restrictors out on mine. Made a massive difference.

I was told that LR put them in due to the suspension and brake setup on Stage 1's not being up to too high performance (probably very true!). There probably is a lot of sense in assuming that the engineers who designed them knew more about it that you.

I worked on the basis that I can judge when I'm pushing a vehicle too hard and pull back a little, and the bit about brakes and suspension counts less off road anyway.

Mine were drilled through, then tapped. A puller then used to heave them out.

jonnyboy · Post by **jonnyboy** » Tue Feb 27, 2007 2:16 pm

Big hammer and a chisel took mine out!

I actually removed them before I got the vehicle on the road so have never driven with them in place. Plus I have a pair of SU's on now so not the best for comparison.

Jon

Kiwistage1V8 · Post by **Kiwistage1V8** » Wed Feb 28, 2007 8:33 am

restrictors?

Edelbrock performer, and 465 holley!

jonnyboy · Post by **jonnyboy** » Wed Feb 28, 2007 9:21 am

Kiwistage1V8 wrote:restrictors?

Edelbrock performer, and 465 holley!

I wouldnt burden my V8 with a 4 barrel carb, just wait until I get my megasquirt and Independent Throttle Bodies fitted

Kiwistage1V8 · Post by **Kiwistage1V8** » Wed Feb 28, 2007 4:17 pm

*drool*

Basil · Post by **Basil** » Thu Mar 01, 2007 7:56 pm

jonnyboy wrote:
Kiwistage1V8 wrote:restrictors?

Edelbrock performer, and 465 holley!
I wouldnt burden my V8 with a 4 barrel carb, just wait until I get my megasquirt and Independent Throttle Bodies fitted

I have fallen in love

jonnyboy · Post by **jonnyboy** » Fri Mar 02, 2007 3:16 pm

Thought about fitting 4 webbers for a while