Any cars on which the standard intake is restrictive?
Discussion
Special K said:
I thought the GSi Corsa just used the X16XE engine, which wasn't great anyway ?
Nope. Early Gsi had the C16XE... corking little engine!!! It did have a very restrictive inlet.... heard many reasons over the years as to why it was on there. From either on there to keep power down for insurance reasons or to stop in being faster than the Astra Gsi. Or as someone else mentioned, just to keep induction noise down.
Mantzel and Lexmaul both did a replacement inlet that genuinely added about 20bhp...
fit some ITBs instead and cams and the engine reliably makes 185bhp from 1600cc. Brill little engines
Most cars have fairly restrictive intakes these days for a couple of reasons. Firstly the engine bay is usually tightly packaged so the pipes have to take an odd route, and secondly the induction roar. If you want to make more power a ram pipe sticking through a hole in the bonnet is the best way.
Baryonyx said:
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.
Awful cars??? My wicked red VTR is still one of my favourite cars owned. Mine was a 2001 98bhp version and was great fun round the twistysinsanojackson 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 s
tting 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.
aka_kerrly said:
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.
I'd be amazed if sucking in hot air through a generic pipe is any better than the oem intake.blade7 said:
zcacogp said:
Mk1 Golf GTi. Very restrictive airbox.
Cutting holes in it helped no end.
Lol, helped it make a bit more induction noise more like.Cutting holes in it helped no end.
(Note - all according to my mate.)
Oli.
As mentioned above the C16XE Corsa GSi engine.
The story goes Lotus helped with the development and could have delivered up to 150bhp from it.
Obviously Vauxhall couldn't have this, it had to fit into the Vauxhall range between the 1.4 and the 1.8. So they fitted an un-necessarily complicated inlet manifold and strangled it down to approx 109bhp.
A well set up (ie remapped and raised rev limit) engine with replacement Mantzel inlet aka 'power box' will show 140-150bhp.
The story goes Lotus helped with the development and could have delivered up to 150bhp from it.
Obviously Vauxhall couldn't have this, it had to fit into the Vauxhall range between the 1.4 and the 1.8. So they fitted an un-necessarily complicated inlet manifold and strangled it down to approx 109bhp.
A well set up (ie remapped and raised rev limit) engine with replacement Mantzel inlet aka 'power box' will show 140-150bhp.
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
It's ni on impossable for any EFI car to run lean no matter what you do with the air filter, the ecu just compensates, any power loss is down to to reversion waves created by removing the tuned lenth intake system (that's why a lot of modern cars have resonator boxes in the intake piping) or more usually down to sucking in hot air which is less dense than cold air so the ECU injects less fuel to compensate hense less 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
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.
Gassing Station | General Gassing | Top of Page | What's New | My Stuff