The Roadster NA Journey Begins

Postby **NitroDann** » Fri May 10, 2013 8:55 pm

gslender wrote:1.9 .... So a 1.8 stroked?

G

BPs are well over 1.8L from the factory.

Dann

mazmad · Postby **mazmad** » Sat May 11, 2013 8:51 am

Bit late to the party....great thread Magpie!

Interested to see how the itb's go, they are just a thing of beauty aren't they!!?? How did the venting go? I am going to try to get air into the footwell, that is the biggest heat buildup area. Not so pressing coming into winter but will get it done.

Edit. What does the coolbreeze scoop weigh do you think?

Magpie · Postby **Magpie** » Sat May 11, 2013 10:48 am

The Coolbreeze scoop weights nothing and did a good job (my son has it now). The Coolbreeze will get the air into the foot well as well as very small bugs. However it can only be used when the top is down/off hence why I went for the carbon roof scoop. The roof scoop does a brilliant job with the roof on, but does add to the noise level in the cab because of its design even with the vents closed.

ITB's yes they are a thing of beauty and since I will not be using pod filters rather an air box we just need to figure out where to get the air from. This will be decided once they have been installed and looking for suggestions from others as to where it can be taken from the same side as the ITB’s. Jenvey suggest that ‘A guide figure, from the face of the trumpet to the centre of the valve head is 350mm for a 9,000 RPM engine’ so trumpet length will be decided when it is being tuned. However the master cylinder maybe in the way (and have to be relocated) when the trumpet length and airbox dimensions are taken into account. Again there may have to be a compromise with respect to trumpet length.

mazmad wrote:Interested to see how the itb's go, they are just a thing of beauty aren't they!!?? How did the venting go? I am going to try to get air into the footwell, that is the biggest heat buildup area. Not so pressing coming into winter but will get it done.

Edit. What does the coolbreeze scoop weigh do you think?

mazmad · Postby **mazmad** » Sat May 11, 2013 4:04 pm

I always have the roof on - keeps dust out, Wakefield in particular can be pretty dusty if people cut some corners or you have a cross country excursion. Have seen a number of options deciding which way to go at this point. Probably either go a quarter window with scoop ducted, or duct from original vent inlet.

How much difference did the wing make, do you have comparative times before/after?

koop21 · Postby **koop21** » Sat May 11, 2013 4:33 pm

Magpie wrote:However the master cylinder maybe in the way (and have to be relocated) when the trumpet length and airbox dimensions are taken into account. Again there may have to be a compromise with respect to trumpet length.

Mags, to save you some time yes you will need to relocate the clutch master and the a/c if you still have it in there. I think i have same airbox as you do and gave up on that option because i didnt want to relocate that stuff. So i might explore this option in the future and cut up the box to make it fit around the the clutch master. Another option you might want to try is to offset the cuts outs ont the back plate for the trumpets so that left side (close the clutch master) just clears it. Just a thought.

Magpie · Postby **Magpie** » Sat May 11, 2013 4:57 pm

koop21 wrote: Mags, to save you some time yes you will need to relocate the clutch master and the a/c if you still have it in there. I think i have same airbox as you do and gave up on that option because i didnt want to relocate that stuff. So i might explore this option in the future and cut up the box to make it fit around the the clutch master. Another option you might want to try is to offset the cuts outs ont the back plate for the trumpets so that left side (close the clutch master) just clears it. Just a thought.

Thanks, I thought that this would be the case. The air con is going anyway as there is a concern that at 8,400 rpm there is not sufficent safe clearance between the AC clutch and compressor so one less thing to worry about.

mazmad wrote:I always have the roof on - keeps dust out, Wakefield in particular can be pretty dusty if people cut some corners or you have a cross country excursion. Have seen a number of options deciding which way to go at this point. Probably either go a quarter window with scoop ducted, or duct from original vent inlet.

How much difference did the wing make, do you have comparative times before/after?

The roof scoop I have is actually very good at getting air in without too much dust, I also have the quarter windows scoop ducted as well so between the 3 there is a large quantity of air to keep me cool (provided I'm not stopped).

Wing before and afters I will have some soon but they will be skeewed by the new motor. However I do plan to do some testing of the wing angle now that I have the splitter done. I think that the wing was more than likley reducing my top speed (drag) but without the splitter the car was not balanced. I can always grab my sons stock NA and do some laps in it to see what the changes have been.

Apu · Postby **Apu** » Sat May 11, 2013 5:12 pm

mazmad wrote:Bit late to the party....great thread Magpie!

Interested to see how the itb's go, they are just a thing of beauty aren't they!!?? How did the venting go? I am going to try to get air into the footwell, that is the biggest heat buildup area. Not so pressing coming into winter but will get it done.

Edit. What does the coolbreeze scoop weigh do you think?

Sorry for the hijack but Mazmad, if you are interested in the cool breeze scoop, so am I!

Magpie · Postby **Magpie** » Sat Jul 06, 2013 4:48 pm

Been a while since a post but I dropped in to MX5 Plus today (after coffe with Kev05 and Zero00)

and this

Those be 85mm 11:1 pistons. Better news is the head is back on Monday so by Friday the ITB's should be attached. More photos then.

Side note is I checked my ride height at the pinch welds and found the following 65mm PF, 59mm DF, 59mm PR and 57mm DR so this may explain why the splitter is not giving a lot of downforce. So it looks like I will be working on the ride height this time home and putting about 10mm rake on the car. Then have to corner weight the car again... and all the previous testing will have to be repeated my other half will be happy that I'm spending my home time with my MX5.

While I'm at it I may swap the 16mm rear sway out for the standard as I do not like the amount of understeer the car has got since I went from none to the 16mm. However it may be smarter to do just one change at a time (ride height/corner weight).

toppertee · Postby **toppertee** » Sat Jul 06, 2013 5:14 pm

^^^

Enough said

Magpie · Postby **Magpie** » Sun Jul 07, 2013 10:35 am

Magpie wrote:Side note is I checked my ride height at the pinch welds and found the following 65mm PF, 59mm DF, 59mm PR and 57mm DR so this may explain why the splitter is not giving a lot of downforce.

I forgot to add 51mm to all the measurements so it should be 116mm PF, 110mm DF, 110mm PR and 108mm DR (no driver and a non level area but a constant slope). Plan is to adjust everything on Monday, should be fun

Magpie · Postby **Magpie** » Sat Jul 20, 2013 3:18 pm

Not really an update by my son's red NA is now mine, he has gone for a 2012 model 4 door commodore (8,000k on the clock). So it is time to scale back the cars so the 800M looks like it is the first to go then I need to toss up between the Fiat X19 and the red MX5 NA6 plus the project boat in the shed needs to be gone (all on order of she who must be obeyed).

corners · Postby **corners** » Sat Jul 20, 2013 4:58 pm

Magpie wrote:Not really an update by my son's red NA is now mine, he has gone for a 2012 model 4 door commodore (8,000k on the clock). So it is time to scale back the cars so the 800M looks like it is the first to go then I need to toss up between the Fiat X19 and the red MX5 NA6 plus the project boat in the shed needs to be gone (all on order of she who must be obeyed).

If your giving up these projects, surely you won't need all those tools anymore...

Magpie · Postby **Magpie** » Sat Jul 20, 2013 5:50 pm

Everybody needs more tools, less projects implies more money to spend on tools. Plus I have added to the collection of tools toys

Magpie · Postby **Magpie** » Mon Jul 22, 2013 8:08 pm

Well the last part for my ITB's has turned up after almost 7 months, the pipercross air box. Will post photos tomorrow. Also tomorrow I will be corner weighting, setting per load on the shocks as wel as getting the ride height correct before eccentric front bushes on thu. Then out to Morgan Park on sat for some seat time. This should be the cars last run on the track as a 1.6

I reckon I can do the corner weight, height and preload in about 4 hours, excluding disconnecting and reconnecting the sway bars etc. Most of the time is in getting the scales setup level this takes a bit of time as the area I have to work in is not very level

toppertee · Postby **toppertee** » Mon Jul 22, 2013 8:20 pm

Magpie wrote:Well the last part for my ITB's has turned up after almost 7 months, the pipercross air box. Will post photos tomorrow. (

I've run the tape measure over mine, It's going to be tight, good luck in for photos.

I've gone with a foam box, If I'm paying for ITBs I want to hear them :mrgreen: