Mine is worse. 2.25 to 2.5 to 3

 

57mm to 63.5mm to 76.2mm?

You have a 57mm MAF?

 

I've got the Mina CAI which comes with a new housing.

 

What size is your engine?

What size is your MAF in mm?


What is the air speed velocity of an unladen swallow? (European)



Your TB is now 3.09" 78.5mm

 

Ive got the 4.2 and I will double check the size of my maf tonight,

also, the airspeed velocity of an unladen swallow is roughly 11 meters per second, or 24 miles per hour, beating its wings 7-9 times per second (rather than 43). But please note that a 5 ounce bird cannot carry a one pound coconut.

 

This thread reminds me of when I lifted the bonnet on my car to show it to Avos...

"Wow that's a small pipe" he said, I could have cried, in fact I did a little...

 

That does look like a tiny pipe. What diameter is it? Looks more restrictive than stock.

 

Just measured it, the Mina is 5/64ths of an inch smaller. Looks like time to upgrade

 

[/QUOTE] also, the airspeed velocity of an unladen swallow is roughly 11 meters per second, or 24 miles per hour, beating its wings 7-9 times per second (rather than 43). But please note that a 5 ounce bird cannot carry a one pound coconut.[/QUOTE]

It could grip it by it's husk!

...or two could co-operate and carry it with a string....


Heh...seriously, it is my opinion that you would greatly benefit from upgrading the diameter there. You will notice a difference. I got my parts from: Intercooler Pipe Fabrication - Silicone Intake Systems Auto Parts

I wrapped some of this rescue tape Rescue Tape - World's #1 Brand of Silicone Tape! around the TB until the outside diameter was large enough that the 90 degree 3.5" elbow fits snugly, then clamped. You might need to cut the silicon elbow down a small amount so the hood will still close easily as I did. The fact that the 3.5" elbow is a bit larger than the TB is inconsequential because the air is being sucked in, not blown in.

I suggest a 3.5" intake the whole way.

For the longer tube parts you would benefit from something more rigid like a pipe, so it does not suck itself closed. Here is a good source for the 3.5" pipe 3 5" Aluminum Tube Tubing Pipe | eBay

I think it is very important to insulate that pipe too, so it does not pick up any heat. Some say the air is moving too quick to pick up any heat, but it goes by the charge coolers even quicker, and they transfer a lot of heat. (yes I know the fins give much, much more surface area, but air through a hot pipe does get hotter)


Please see my post : https://www.jaguarforums.com/forum/j...into-tb-93573/ to see what I did.

I insulated mine (see photo) with aluminized heat shield blankets wrapped in HVAC tape. It also fulfills the secondary function of blocking alien mind control rays.
It is VERY important to make sure you are sucking COLD air. Does your intake take air from outside or from the engine bay?

Every 10 degrees F of air temp reduction = 1% more HP It is easily 30 degrees cooler air outside the engine bay = 3% more power.

400 HP x .03= +12 more HP just from the cooler air, as compared to your current set up, if you are currently sucking in engine bay air.

You would probably at gain at least +15+ more HP to go to a full 3.5" intake from your current Mina intake, since it is smaller than it ought to be.

The HP gain will be enough you will feel it, especially if you can get the smooth 90 degree bend into the TB as I suggest. I advise avoiding any intake that retains the cobra head design as it is definitely a bottleneck for flow.

I think I am the first to solve the problem of getting the hood to close with a 3.5" fitting by using something pliable, so the hood can deform it a little as needed, but still retain the larger functional diameter for the best possible flow. I say it has NOT all been done before.

All of this will help the larger bored TB make use of the increased potential for flow. It is said that you can't go too big before the TB, as long as your air meter reads correctly.

 

I inquired about this and Eurotoys said it's 85mm, not 90mm.

 

I'll have to live with the 82mm for now.

 

We have the same year cars, mine was bored 82.5. Not that .5mm would make that big of a difference, but are you sure yours is 82 and not 82.5mm?

 

WD

PM sent

 

Hi - here is a different solution to the same prob, mine is a 1999 XJR with a Andre Supercharger - Adeco Maf and a maxbored 81 mm TB - and a adjustable fuel pressure reg. - I am in the mock up assembly at present, my biggest drama seems to be the heat shields I had to make -

 

Would this fine community of truth seekers permit me to please, please, pretty please, with sugar and a cherry on top, permit me to ask that this poster to please post a video of screen shots when this car is on a dyno when the car is completed so that this truth searching community may have the benefit of knowing what HP gains the twin screw truly delivers to anyone other than the person selling them?

I kindly beg the indulgence of the members of this truth seeking community that I be permitted to satisfy my skepticism, with a show of video evidence, of what the results of such a modification truly yield in the world.

Would this not be for the benefit of the truth seeking community?

I am only most humbly asking for a video.

Please?

 

Wow!

Did someone go to politeness school? That is the most polite "throwing down of the gauntlet" I have ever seen.

I second that request. I too would like to see a video of this car on the dyno when it is ready. Or any video of twin screw on a dyno for that matter, I know there are some monsters out there.

Any takers on these requests?

 

Ha Ha - I don't have a prob posting dyno video, - you'll need to be patient though, I have been doing this for 8 months now, __ Exhaust, suspension, brakes and all the other stuff is finished, obviously heads are back on and S/C fitted - just a few small jobs
DC

 

Great news!

What did you do to the heads?

Ported? Cams? larger valves?

I was supposed to get a set of ported heads with 2mm larger intake and 1mm larger exhaust, but the deal went south and did not happen. I was hoping to pick up approx 40 HP from those so it is too bad it did not work out.


Ideally if you could show the screen of the video during the run and result at the end, then pan to the engine bay of the car, that would be perfect.

 

40hp from head mods seems a lot - I was chasing compression problems. I have a new set of valves (manly), only the exhausts are bigger, given that the boost is increased 9-10 PSI, all the heights and CC's and new spring tensions are the same, exhaust ports have been increased to suit . - nameless 100 cell cats and a quicksilver twin 2 and a half exhaust. Only other work has been to de bur and match port intake.
I originally posted the pic after seeing the other 2 posts - depicting intakes - Somebody should take a big stick to MIna - My intake will also be properly insulated when the job is completed. I noticed your mounting of the AIT sensor - I intend to thread mine inside the intake, and insulate the MAF and aircleaner from the engine bay.
Cheers,
DC

 

Testing