On the hunt - 4.5 airboxes & hose query.

[TIIVRS]

I’m looking for standard air boxes, mine are a bit mashed up and the backplate for the hoses has some loose screws and is not sealing properly. Hoses are knackered too! I’m hoping some of you that may have swapped to the ACT carbon induction might be interested in re-homing your old ones. If so let me know!

My purple pipes are also past their best, they’re all very different shapes and one has wire poking out! I’d like to keep with long hoses if I can (prefer the look and a ‘better’ torque profile - I have to assume the guys that built the ajp at the factory fitted these longer hoses for the right reasons). Has anyone sourced alternative long hoses from anywhere preferably with a better type of re-enforcement - I have emailed samco and they told me that they made the originals and can manufacture them to order (in any colour). Has anyone done this / any photos? They’re pretty expensive would anyone be interested in a group buy?

Once I have these sorted and the car isn’t gulping unmeasured air I will be looking to get a re-map as it could do with a tune. There seems to be a lot of posts around the short induction retro-fits, lots of people stating an improvement after fitting but I am wondering whether the majority of any improvement would just be down to having someone who knows what they are doing taking the time to produce a new tailored map. Has anyone re-mapped on the long hoses and got a decent result?

[ukkid35]

TIIVRS said:

Once I have these sorted and the car isn’t gulping unmeasured air I will be looking to get a re-map as it could do with a tune.

No MAF or similar on these cars, so leaks don't affect mixture unless they occur after the butterflies (throttle body heat shield is the most likely culprit)

[Byker28i]

I wouldn't bother messing - just go straight to http://www.kitsandclassics.co.uk/tvr-cerbera-v8-tu...

[Imran999]

I’m sticking with the long induction on my 4.5 too, might be interested in getting new purple hoses.

[Jhonno]

I think in reality the short hoses don't actually loose much if any low end torque, but the extra top end makes it feel that way by
the seat of the pants style of dyno'ing the car...

[TIIVRS]

ukkid35 said:

No MAF or similar on these cars, so leaks don't affect mixture unless they occur after the butterflies (throttle body heat shield is the most likely culprit)

Wow, that’s a surprise I thought the sensor by the intake was MAF as I couldn’t find a MAP (haven’t had time to explore the car yet but I wondered why it was so far forward... must be just temp then). Perhaps this might explain the pops and bang nature of the car - ECU must just default to add more fuel! I have been getting an misfire/backfire under full throttle, my first thought was an AFR issue, hence looking to address the intake issue. Timing / throttle bodies should be fine as recently been to powers for a 12,000 service, perhaps a spark issue then receipts show HTLeads have been replaced... would I be right assuming a coil pack issue?

[Imran999]

Just took a closer look at my silicon hoses - will definitely need to replace these soon.

Can’t take my car for a Joolz short induction and remap, as it now lives across the Atlantic.

[FarmyardPants]

TIIVRS said:

ukkid35 said:

No MAF or similar on these cars, so leaks don't affect mixture unless they occur after the butterflies (throttle body heat shield is the most likely culprit)

Wow, that’s a surprise I thought the sensor by the intake was MAF as I couldn’t find a MAP (haven’t had time to explore the car yet but I wondered why it was so far forward... must be just temp then).

Yes, just intake temp to trim the fuelling. The ECU doesn't monitor airflow at all, as ukkid says.

TIIVRS said:

Perhaps this might explain the pops and bang nature of the car - ECU must just default to add more fuel!

That's due to the cam timing inlet/exhaust overlap.

TIIVRS said:

I have been getting an misfire/backfire under full throttle, my first thought was an AFR issue, hence looking to address the intake issue. Timing / throttle bodies should be fine as recently been to powers for a 12,000 service, perhaps a spark issue then receipts show HTLeads have been replaced... would I be right assuming a coil pack issue?

Yes that sounds like an ignition problem. Could be plug leads not seated properly, or coil packs.

[TIIVRS]

Ok thanks will have a play with the leads...!

[pmessling]

I replaced my purple hoses with ACT ones unfortunely they started to discolour after a while. I don’t think they have a fuel resistant inner layer. I’ve seen adverts on eBay that samco do replacement hoses not sure if they have a fuel resistant layer might be worth a email as samco do that sort of hose for other applications.

[TIIVRS]

Pulled the air boxes today, there was a vacuum hose loosely fed into the top of the near side box (any ideas what it’s for if it’s not MAP?) anyhow a couple of the leads felt a bit loose by the plugs will take it for a blast tomorrow and keep my fingers crossed that it was just that.

Samco can do fuel and oil resistant hose, I will ask them if they can make intake hoses with this material - would be nice if they didn’t discolour.

[Imran999]

I think they're about 500 quid a set from Samco.
Keen to see how many of us might be interested in a group buy.
I'm in, of course!

[TIIVRS]

Thanks Farmyard.. re-seated leads, 2 were wobbling and another had been oversquashed so wouldn’t push down enough, quick squish with some pliers and all is now good. Just went for a drive and it’s raging nicely, not often the easiest fix works - maybe my luck is turning! Now that’s sorted have noticed more valvetrain noise on nearside bank, sounds like a tap in every 4 is this normal?

Imran i’ll ask them how many they need to do for a discounted run.