Any cars on which the standard intake is restrictive?

[Byard]

Just a thought as the 0-60 claims will be better than they actually are with just a simple modifcation / panel filter. I heard Saxo VTRs are quite restrictive, aswell as fiesta STs?

Don't know how true this is but does anyone know of any other cars that have restrictive filters?

[reggie82]

Not a filter, but the e36 323i and 328i both have restrictive inlet manifolds.

[HellDiver]

83hp 1.4 K-series has a restrictor in the throttle body. Take it out/replace it, instant 105hp version.

[ShampooEfficient]

HellDiver said:

83hp 1.4 K-series has a restrictor in the throttle body. Take it out/replace it, instant 105hp version.

Isn't the 90bhp BMW Mini just the 100bhp, but with the software not letting the throttle open fully?

[Petrolhead_Rich]

HellDiver said:

83hp 1.4 K-series has a restrictor in the throttle body. Take it out/replace it, instant 105hp version.

I found the 1.4 K-Series in the old wedge shaped rover's had a very small filter and ran alot better with a chav filter on the end of the throttle body, which is surprising as most small engined cars run really lean with the chav filters on and loose power!

Coupled with a Catalytic Converter from a Rover 800 2.5V6 and a Rover 220 Magnex Stainless system and it ran like a dream!

I had a Rover 214 that would top 135MPH (as clocked by West Yorkshire Police!) with the above mods, but even with a K&N in the standard filter box was struggling to top 115MPH!

I think a major issue with alot of modern cars is the packaging and routing of the intake rather than smooth and free air flow!

Not to mention emissions pumping your exhaust fumes into the inlet

[insanojackson]

Petrolhead_Rich said:

I found the 1.4 K-Series in the old wedge shaped rover's had a very small filter and ran alot better with a chav filter on the end of the throttle body, which is surprising as most small engined cars run really lean with the chav filters on and loose power!

Coupled with a Catalytic Converter from a Rover 800 2.5V6 and a Rover 220 Magnex Stainless system and it ran like a dream!

I had a Rover 214 that would top 135MPH (as clocked by West Yorkshire Police!) with the above mods, but even with a K&N in the standard filter box was struggling to top 115MPH!

I think a major issue with alot of modern cars is the packaging and routing of the intake rather than smooth and free air flow!

Not to mention emissions pumping your exhaust fumes into the inlet

135mph??????really? hmmm

[*Al*]

reggie82 said:

Not a filter, but the e36 323i and 328i both have restrictive inlet manifolds.

Yep, fit the 325i inlet manifold for more power!(E36 models)

[SteveS Cup]

*Al* said:

Yep, fit the 325i inlet manifold for more power!(E36 models)

The 323i also has a restrictive exhaust.

[solidlad84]

I had a rover (well an MG ZR 1.4) with the same engine and mods, and even with an inaccurate speedo theres no way it would ever go above an indicated 125 down a nice gradient (actual speed I imagine somewhere around 115-118), let alone an actual speed of 135 which would be showing something like 145+ on the speedo.

[andye30m3]

I seam to remember hearing that the old Corsa GSI was de-tuned on the inlet side as it was embarrassing the Astra GSI of the same era

[zcacogp]

Mk1 Golf GTi. Very restrictive airbox.

Cutting holes in it helped no end.


Oli.

[vdubbin]

ShampooEfficient said:

Isn't the 90bhp BMW Mini just the 100bhp, but with the software not letting the throttle open fully?

Something like that, 83 bhp stock, but can be Bluefinned to match the Cooper 120-odd bhp.

[Baryonyx]

Byard said:

Just a thought as the 0-60 claims will be better than they actually are with just a simple modifcation / panel filter. I heard Saxo VTRs are quite restrictive, aswell as fiesta STs?

Don't know how true this is but does anyone know of any other cars that have restrictive filters?

A couple of my mates had Saxo VTR's years ago and they placed Pipercross/K&N air filters in and didn't report much of a differences other than that the engine noise changed for the worse. Mind you, those were awful cars.

[aka_kerrly]

You will find most cars have restrictive inlet systems and less than ideal routing/location within the engine bay in order to keep noise levels down as having a open filter an short runner intake makes the engine a lot louder in terms of induction noise on acceleration.

[Porkie]

Petrolhead_Rich said:

I had a Rover 214 that would top 135MPH (as clocked by West Yorkshire Police!) with the above mods, but even with a K&N in the standard filter box was struggling to top 115MPH!

Chinny Reckon!

[nottyash]

My little Daihasu Cuore has a really restricted manifold, it goes fron the 4 cylinders to one pipe the size of a 50p piece. Apparently it was to meet the Japanese Kei car standards where the power has a certain limit.

[anonymous-user]

Petrolhead_Rich said:

I had a Rover 214 that would top 135MPH (as clocked by West Yorkshire Police!) with the above mods, but even with a K&N in the standard filter box was struggling to top 115MPH!

Sounds like bullst to me..

I have a VI and that would struggle to get to 135...

[Special K]

andye30m3 said:

I seam to remember hearing that the old Corsa GSI was de-tuned on the inlet side as it was embarrassing the Astra GSI of the same era

I thought the GSi Corsa just used the X16XE engine, which wasn't great anyway ?

[mph1977]

HellDiver said:

83hp 1.4 K-series has a restrictor in the throttle body. Take it out/replace it, instant 105hp version.

a technique adopted by BL/ARG in the past with the Stage 1 Landie and some 110/130s and some LDV400 vans with the rover v8 ...

[Baz Tench]

The 986 Boxster S is quite restricted isn't it?