40 replies to this topic

[NickB787]

Been on the lookout for ways to drop the under-tray for extra cooling and make it easy for me to remove it when I want without all the fiddling that takes place with aligning bolt holes up

I was thinking about these, they do come in other sizes as well



spacers

was thinking male- female spacers but the thread hole is only 6mm deep, bit small really.

only thought these would do the 5 rear holes ( 7 in my case - TAT) but there the big bolts go in I would need something else to
stop the tray flexing

Edited by NickB777, 11 August 2009 - 08:07 AM.

[N17VES]

Been on the lookout for ways to drop the under-tray for extra cooling and make it easy for me to remove it when I want without all the fiddling that takes place with aligning bolt holes up

I was thinking about these, they do come in other sizes as well



spacers

was thinking male- female spacers but the thread hole is only 6mm deep, bit small really.

only thought these would do the 5 rear holes ( 7 in my case - TAT) but there the big bolts go in I would need something else to
stop the tray flexing

Eliseparts do some quick release fastners....

http://www.elisepart....php?product=96

Being thinking about getting them myself.

[NickB787]

It's not the quick release I am after it's the spacer to make certain there isn't too much heat in the engine bay.

Eliseparts do oneSpacer but by the look of it it's not more than 15-20mm deep

think I might just order some and see how the look.

[VIX]

Guglielmi do have a machine shop and can make parts to order. IIRC not particularly cheap though. Might be worth a call to Steve.

[NickB787]

Guglielmi do have a machine shop and can make parts to order. IIRC not particularly cheap though. Might be worth a call to Steve.

I am about to speak to him to get the car booked in for him to check the geo, however I think that £15.00 is worth trying, MMG wanted £50 a bit much IMHO but I know they do good stuff.

[Nev]

Nick, have you considered running the car without a rear floorpan whatsoever? Its both heavy and constricts airflow. I ran my car for approx 1000 miles without it and found no difference in handling upto approx 120 leptons per hour. Maybe if you go over this speed you might find a slight bit of difference... but it may well be completely negligable. In the end I replaced the floorpan becuase of risk of water ingress whilst driving though puddles and potholes - you don't run this risk so much on track (hopefully!). You could even consider removing ALL the floorpans, their combined weight is quite a bit (approx 12 KG if i remember correctly). IMHO if I were tracking my car regularily, I would at least try/experiment this for a day.

Edited by Nev, 11 August 2009 - 12:24 PM.

[182ian]

Nick, have you considered running the car without a rear floorpan whatsoever? Its both heavy and constricts airflow.

I ran my car for approx 1000 miles without it and found no difference in handling upto approx 120 leptons per hour. Maybe if you go over this speed you might find a slight bit of difference... but it may well be completely negligable. In the end I replaced the floorpan becuase of risk of water ingress whilst driving though puddles and potholes - you don't run this risk so much on track (hopefully!).

You could even consider removing ALL the floorpans, their combined weight is quite a bit (approx 12 KG if i remember correctly). IMHO if I were tracking my car regularily, I would at least try/experiment this for a day.

My worry there would be the stress you must be placing on the rear clam as you are giving it no structual fixing along the bottom edge!

[182ian]

Been on the lookout for ways to drop the under-tray for extra cooling and make it easy for me to remove it when I want without all the fiddling that takes place with aligning bolt holes up

I was thinking about these, they do come in other sizes as well



spacers

was thinking male- female spacers but the thread hole is only 6mm deep, bit small really.

only thought these would do the 5 rear holes ( 7 in my case - TAT) but there the big bolts go in I would need something else to
stop the tray flexing

So what you are after is a spacer of how deep? with a male thread out of one end to screw into the fixings on the clam and the other end of the spacer to have a hole with the thread to then bolt your undertray, therefore lowering it?

[JimmyJamJerusalem]

Nick, have you considered running the car without a rear floorpan whatsoever? Its both heavy and constricts airflow.

I ran my car for approx 1000 miles without it and found no difference in handling upto approx 120 leptons per hour. Maybe if you go over this speed you might find a slight bit of difference... but it may well be completely negligable. In the end I replaced the floorpan becuase of risk of water ingress whilst driving though puddles and potholes - you don't run this risk so much on track (hopefully!).

You could even consider removing ALL the floorpans, their combined weight is quite a bit (approx 12 KG if i remember correctly). IMHO if I were tracking my car regularily, I would at least try/experiment this for a day.

My worry there would be the stress you must be placing on the rear clam as you are giving it no structual fixing along the bottom edge!

You would if you still had a diffuser fitted!!!

[182ian]

Nick, have you considered running the car without a rear floorpan whatsoever? Its both heavy and constricts airflow.

I ran my car for approx 1000 miles without it and found no difference in handling upto approx 120 leptons per hour. Maybe if you go over this speed you might find a slight bit of difference... but it may well be completely negligable. In the end I replaced the floorpan becuase of risk of water ingress whilst driving though puddles and potholes - you don't run this risk so much on track (hopefully!).

You could even consider removing ALL the floorpans, their combined weight is quite a bit (approx 12 KG if i remember correctly). IMHO if I were tracking my car regularily, I would at least try/experiment this for a day.

My worry there would be the stress you must be placing on the rear clam as you are giving it no structual fixing along the bottom edge!

You would if you still had a diffuser fitted!!!

I'm a little lost at the moment i think, does the car have the standard undertray then the TAT diffuser underneath that?

[techieboy]

No, the TAT replaces the OE undertray. It should be fine with the spacers as they would screw into the existing brace/spreader that you have to fit inside the clam for the diffuser anyway.

[John Faulkner]

the clam will be 100% fine without the trays on there. mine are off & have been for some time i like the extra air flow TBH. but again i only drive mine in summer so water ingress is not a problem for me. I wont be putting mine on for a while, although i think the theory behind them is they increase grip slightly by making the air flow faster under the car than over it, thus helping with down force? the last sentence may be complete crap, so don't take it for gospel!

[182ian]

No, the TAT replaces the OE undertray. It should be fine with the spacers as they would screw into the existing brace/spreader that you have to fit inside the clam for the diffuser anyway.

Understood, that would not be too hard to make up really, so is it five with M5 threads and two with m8 threads? What where you thinking nick spacing it about 40-50mm?

[VIX]

i think the theory behind them is they increase grip slightly by making the air flow faster under the car than over it, thus helping with down force?

I thought one of the benefits of the undertrays was the NACA ducts which increase airflow through the engine bay and out through the vents on the boot lid to encourage cooling. I could be talking bollox though.

PS. A trawl back through Ricky2772 posts might give some ideas - he took his undertrays off as part of a mega weight reduction programme.

[cthomas443]

No, the TAT replaces the OE undertray. It should be fine with the spacers as they would screw into the existing brace/spreader that you have to fit inside the clam for the diffuser anyway.

Understood, that would not be too hard to make up really, so is it five with M5 threads and two with m8 threads? What where you thinking nick spacing it about 40-50mm?

Nickb777 I also have a TAT diffuser, it doesnt have the recessed bit at the m8 button heads like the oe undertray, so i spaced it away by 15mm to give more clearance between the cat and tray.

Used 50mm stainless round bar with an 8.5mm clearance hole, could do the same with smaller bar for the m5 fixings and put longer bolts reaching into the TAT brace/spreader bar.

Could make you some for a small fee at a spacing of your choice.

[NickB787]

finally got back to this, thanks for the replies.

So what you are after is a spacer of how deep? with a male thread out of one end to screw into the fixings on the clam and the other end of the spacer to have a hole with the thread to then bolt your undertray, therefore lowering it?

Yep thats what I had in Mind. I have a short TAT version which replaced the standard rear under-tray. I brought some Male-Male spacers only 30mm (M6 thread) as thats all they had to hand I will check to see if it will work OK and then if I am happy I will get some 40mm maybe 50mm. My only concern are the 2 larger bolts (I replaced all the under-tray allen key heads with bolts) and the 30mm gap I will have created, I need something to go there. Other factor for Male - Male was that the Male - Female had 6-8mm threaded section might not be enough. It still leaves me with exposed thread under the car, OK not much but I will try some grease on them to see if that will stop them corroding.

Nickb777 I also have a TAT diffuser, it doesnt have the recessed bit at the m8 button heads like the oe undertray, so i spaced it away by 15mm to give more clearance between the cat and tray.

Used 50mm stainless round bar with an 8.5mm clearance hole, could do the same with smaller bar for the m5 fixings and put longer bolts reaching into the TAT brace/spreader bar.

Could make you some for a small fee at a spacing of your choice.

Thanks that was the other method I was looking at, will keep your offer in mind . I am hoping though that once I get the spacers fixed to the car underside It should be a easy job to remove and replace the TAT without all the fiddling that goes on at present. Other advantage I hope is I will be able to get a Brace bar below the 3" exhaust and above the TAT without touching.

I do tend to remove my TAT more than normal people as I seem to ticker with the thing all the time

Edited by NickB777, 12 August 2009 - 07:54 AM.

[NickB787]

i think the theory behind them is they increase grip slightly by making the air flow faster under the car than over it, thus helping with down force?

I thought one of the benefits of the undertrays was the NACA ducts which increase airflow through the engine bay and out through the vents on the boot lid to encourage cooling. I could be talking bollox though.

PS. A trawl back through Ricky2772 posts might give some ideas - he took his undertrays off as part of a mega weight reduction programme.

I want to run the car with under-trays as it will effect the downforce created by the car and therefore handling. I also wonder how strong the rear clam really is, thinking of it catching all that air.

[VIX]

i think the theory behind them is they increase grip slightly by making the air flow faster under the car than over it, thus helping with down force?

I thought one of the benefits of the undertrays was the NACA ducts which increase airflow through the engine bay and out through the vents on the boot lid to encourage cooling. I could be talking bollox though.

PS. A trawl back through Ricky2772 posts might give some ideas - he took his undertrays off as part of a mega weight reduction programme.

I want to run the car with under-trays as it will effect the downforce created by the car and therefore handling. I also wonder how strong the rear clam really is, thinking of it catching all that air.

Personally, I'd want the trays on, but IIRC Ricky2772 used his car on the 'Ring extensively with the trays off.

[NickB787]

i think the theory behind them is they increase grip slightly by making the air flow faster under the car than over it, thus helping with down force?

I thought one of the benefits of the undertrays was the NACA ducts which increase airflow through the engine bay and out through the vents on the boot lid to encourage cooling. I could be talking bollox though.

PS. A trawl back through Ricky2772 posts might give some ideas - he took his undertrays off as part of a mega weight reduction programme.

I want to run the car with under-trays as it will effect the downforce created by the car and therefore handling. I also wonder how strong the rear clam really is, thinking of it catching all that air.

Personally, I'd want the trays on, but IIRC Ricky2772 used his car on the 'Ring extensively with the trays off.

You see I wonder about that, look how differently the car handles with a diffuser compared to without one. I know Ricky is big into weight loss but weight IMHO is not everything, Handling is more important, also creature comforts ask Max (I notice he still has his heater in his car )

[siztenboots]

i think the theory behind them is they increase grip slightly by making the air flow faster under the car than over it, thus helping with down force?

I thought one of the benefits of the undertrays was the NACA ducts which increase airflow through the engine bay and out through the vents on the boot lid to encourage cooling. I could be talking bollox though.

PS. A trawl back through Ricky2772 posts might give some ideas - he took his undertrays off as part of a mega weight reduction programme.

I want to run the car with under-trays as it will effect the downforce created by the car and therefore handling. I also wonder how strong the rear clam really is, thinking of it catching all that air.

Personally, I'd want the trays on, but IIRC Ricky2772 used his car on the 'Ring extensively with the trays off.

You see I wonder about that, look how differently the car handles with a diffuser compared to without one. I know Ricky is big into weight loss but weight IMHO is not everything, Handling is more important, also creature comforts ask Max (I notice he still has his heater in his car )

nick , ran my car without any undertrays at anglesey no noticeable negative , maybe a little less aero balance making it a bit nervous at high speed, but thats the front splitter doing its job

Edited by siztenboots, 12 August 2009 - 09:21 AM.