American car with a block under the gas pedal?
American car with a block under the gas pedal?
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Dr G

Original Poster:

15,957 posts

271 months

Tuesday 15th April 2014
quotequote all
Apologies for silly thread title; I'm trying to remember a story I was told years ago about a muscle car of some sort leaving the factory with a limiter/block under the throttle pedal to restrict performance.

Can anyone remember hearing a similar story or am I reciting an old urban myth?

willisit

2,185 posts

260 months

Tuesday 15th April 2014
quotequote all
I know the story you speak of - during the oil crisis. I doubt it's true; most cars were detuned and had speedos with crazy numbers like "85mph" on them.

However, our old Fiesta had a stop under the pedal and I've been in plenty of cars that do as well. I doubt they "stop" or "block" travel much but I don't know the reasoning for them being there beyond, perhaps, a parts-bin approach.

ging84

9,548 posts

175 months

Tuesday 15th April 2014
quotequote all
i think it is a known method of limiting a vehicles performance

i seem to remember hearing a story that the GPO used to do it on some vehicles

i once went to a go-karting place where they would do it for younger kids using the karts

framerateuk

2,941 posts

213 months

Tuesday 15th April 2014
quotequote all
willisit said:
I know the story you speak of - during the oil crisis. I doubt it's true; most cars were detuned and had speedos with crazy numbers like "85mph" on them.

However, our old Fiesta had a stop under the pedal and I've been in plenty of cars that do as well. I doubt they "stop" or "block" travel much but I don't know the reasoning for them being there beyond, perhaps, a parts-bin approach.
Wouldn't this just be a throttle stop? It's there so that you can't push the throttle beyond it's 100% open state. Originally it was there to stop you stretching the throttle cable, but on newer fly by wire cars, it'll be there just to stop the pedal going too far, or to stop it getting stuck under the floor matt.

kambites

71,458 posts

250 months

Tuesday 15th April 2014
quotequote all
Surely it'd be much neater (and less obvious) to change the throttle cable cam thing for a larger diameter one so each unit of cable travel is less rotation of the throttle body?

MGZRod

8,176 posts

205 months

Tuesday 15th April 2014
quotequote all
Iirc the 1.4 rover 25 on the throttle body had a larger plastic piece than the same engine in the MG ZR that essentially stopped the throttle opening fully.

This is just off the top of my head but it rings a bell from forums a few years ago.

rigga

8,805 posts

230 months

Tuesday 15th April 2014
quotequote all
framerateuk said:
Wouldn't this just be a throttle stop? It's there so that you can't push the throttle beyond it's 100% open state. Originally it was there to stop you stretching the throttle cable, but on newer fly by wire cars, it'll be there just to stop the pedal going too far, or to stop it getting stuck under the floor matt.
Throttle stops are generally at the other end of the cable at the throttle body/carb

Fire99

9,865 posts

258 months

Tuesday 15th April 2014
quotequote all
Though it sounds a bit daft, I wouldn't be surprised. There have been many stories over the years of 'curious' goings on in the motor industry that you'd never believe to be true, but were..

omgus

7,305 posts

204 months

Tuesday 15th April 2014
quotequote all
MGZRod said:
Iirc the 1.4 rover 25 on the throttle body had a larger plastic piece than the same engine in the MG ZR that essentially stopped the throttle opening fully.

This is just off the top of my head but it rings a bell from forums a few years ago.
I have heard that before.

Also heard in a Reader Car Thread here the first MINI ONEs and MINI Coopers had the same engine but WOT was limited at 75% for the ONEs, a cheeky remap would remove this restriction and ta-daa! Cheap MINI Cooper.

Leon19841

63 posts

149 months

Tuesday 15th April 2014
quotequote all
omgus said:
I have heard that before.

Also heard in a Reader Car Thread here the first MINI ONEs and MINI Coopers had the same engine but WOT was limited at 75% for the ONEs, a cheeky remap would remove this restriction and ta-daa! Cheap MINI Cooper.
Same as the 125 BMW's, exact same engine as the 130i. Remapping a NA engine and getting an additional 50bhp (and saving yourself £3k)

rodericb

8,864 posts

155 months

Tuesday 15th April 2014
quotequote all
Yes, that does ring a bell. Something like a GTO or Superbee or whatever. The C4 series Corvette ZR1 had a "full powahh" ignition key. But yes, the block under the accelerator pedal sounds familiar. Things were simpler back then - petrol gushed into the engine, barely metered out and if you couldn't find your ignition key you could start your car with the dipstick or even a teaspoon. laugh

Matt UK

18,084 posts

229 months

Tuesday 15th April 2014
quotequote all
Dr G said:
Apologies for silly thread title; I'm trying to remember a story I was told years ago about a muscle car of some sort leaving the factory with a limiter/block under the throttle pedal to restrict performance.

Can anyone remember hearing a similar story or am I reciting an old urban myth?
Back in the days before electronics and fly-by-wire and honestly believe that this probably was a method used to restrict performance. Like someone else said, the things the car industry used to do... you could write a book (as many have!)

Dr G

Original Poster:

15,957 posts

271 months

Tuesday 15th April 2014
quotequote all
rodericb said:
Yes, that does ring a bell. Something like a GTO or Superbee or whatever.
I vaguely recall it being installed at the factory on a particular model to meet an emissions rule or similar.

framerateuk

2,941 posts

213 months

Tuesday 15th April 2014
quotequote all
rigga said:
Throttle stops are generally at the other end of the cable at the throttle body/carb
Lots of cars will still have a stop under the pedal to stop the cable pulling though. My Caterham does - my cable probably wouldn't last long if it wasn't there. In fact, it wasn't fitted properly when I bought the car and the cable was very frayed indeed.

TooMany2cvs

29,008 posts

155 months

Tuesday 15th April 2014
quotequote all
willisit said:
I know the story you speak of - during the oil crisis. I doubt it's true; most cars were detuned and had speedos with crazy numbers like "85mph" on them.
Speedos were legally required not to go past 85mph in the US for years...

rigga

8,805 posts

230 months

Tuesday 15th April 2014
quotequote all
framerateuk said:
rigga said:
Throttle stops are generally at the other end of the cable at the throttle body/carb
Lots of cars will still have a stop under the pedal to stop the cable pulling though. My Caterham does - my cable probably wouldn't last long if it wasn't there. In fact, it wasn't fitted properly when I bought the car and the cable was very frayed indeed.
Throttle stops and pedal stops are not the same thing.

Dr G

Original Poster:

15,957 posts

271 months

Tuesday 15th April 2014
quotequote all
Yes, this was definitely a 'brick under the pedal' type affair with the intention of preventing the throttle from opening all the way...

...until the customer took it home and removed it.

anonymous-user

83 months

Tuesday 15th April 2014
quotequote all
I remember people used to say this about e30 BMWs back in the 90s. We removed said block from a mate's 325i and it made f all difference.

MGZRod

8,176 posts

205 months

Tuesday 15th April 2014
quotequote all
omgus said:
MGZRod said:
Iirc the 1.4 rover 25 on the throttle body had a larger plastic piece than the same engine in the MG ZR that essentially stopped the throttle opening fully.

This is just off the top of my head but it rings a bell from forums a few years ago.
I have heard that before.

Also heard in a Reader Car Thread here the first MINI ONEs and MINI Coopers had the same engine but WOT was limited at 75% for the ONEs, a cheeky remap would remove this restriction and ta-daa! Cheap MINI Cooper.
I think the Rover scenario was even cheaper, get an aggressive file out and take a section of plastic off of the throttle!

This would take you up to the 100+BHP of the MG ZR 105