Any cars on which the standard intake is restrictive?

[Leptons]

1.6 zetec se. A manifold from the ford racing puma is an instant 15bhp apparrantly.

It must be very restrictive as standard. 103 bhp from a 1.6 is pretty shoddy in my opinion. Peugeot were getting 120bhp from 1.6's 20 years ago!

[Nikko 40691]

Clio 172 & 182 inlet manifolds are restrictive.

[Jayho]

Gaz. said:

Petrolhead_Rich said:

insanojackson said:

135mph??????really? hmmm

It was surprisingly quick, According to GPS it was doing 128MPH, reading on speedo 135, got stopped for "doing over 130" but let off (after stting my pants)

Rather annoyed my dad at the time who had a 2.5 X-Type and I could keep up with him easily until it got over 100 when he would start to pull away.

You were 'let off' for doing 130mph? Righto chap, righto.

I think the 1.4 k series I had in my R25 must have been broken. with the bigger throttle bodies, k&n air filter, home made pipe to get cold air to filter and jansspeed exhaust it still struggled once past 70-80 :S

[Decky_Q]

Celica 7 has a butter fly in the airbox to provide restriction for some reason, just guessed it was for cold starts.

[k15tox]

Z18XE from vauxhall is quite restrictive, 123hp in stock form, with a dibilas intake and a tune gives 140hp.

Seem to remember owners of astra vxr's fitting cdti airboxes.

Anybody want to shed any light on that?

[caprirob]

Hyundai Coupe Gen 3 is very restrictive - airbox ducts into a big "resonator" in the NSF wheelarch.

Removing the pipe that goes from the airbox to the inner wing even with a standard paper filter on its own gives better throttle response, more power and more induction noise.

[Robster]

The Mark 2 golf gti 16v came with 2 different size manifords (iirc) earlier cars had I think a 50mm version and newer ones 42mm, smaller one was meant to increase torque but many owners changed to the bigger one , along with a cheap and easy mod to the throttle housing









edited for spelling