80mm throttle body
Discussion
Might be worth considering....that I'm using a 85mm TB which IMO is far bigger than I need.
I seen no gains switching my intake from standard/73mmTB to current setup with 85mm TB.
What size is your IC plumbing ??
IMO, in a lot of cases, especially a turbo car, all that fitting a large, or worse excessively large TB will do, is throw throttle response/control out the window.
Is there a huge difference in performance between 50% throttle, and 100% throttle at present once on boost ??
Fit a bigger TB and that might turn into little difference with 25%-100%
I seen no gains switching my intake from standard/73mmTB to current setup with 85mm TB.
What size is your IC plumbing ??
IMO, in a lot of cases, especially a turbo car, all that fitting a large, or worse excessively large TB will do, is throw throttle response/control out the window.
Is there a huge difference in performance between 50% throttle, and 100% throttle at present once on boost ??
Fit a bigger TB and that might turn into little difference with 25%-100%
I got a Nissan Infinity Q45 throttle body- 90mm, I believe- from the states cheap. I found another one for sale on our forums for $70+shipping:
http://forums.turbobricks.com/showthread.php?t=145...
Let me know if you can't see the link. They've got a cool mechanical/bi-metal air bypass valve too, so you can get rid of the electrical one.
http://forums.turbobricks.com/showthread.php?t=145...
Let me know if you can't see the link. They've got a cool mechanical/bi-metal air bypass valve too, so you can get rid of the electrical one.
I need a 80mm TB as I have just odered a new inlet manifold from USA the is supposed to come with a 80mm TB. But it is a drive by wire one which is no good as I hane a throttle cable.
The manifold has a 80mm x 80mm opening designed for 80mm TB. I thought if I attached my orignal TB to this manifold (which is 70mm i think) I thought I would be strangling power.
I have 3" pipe work from the charge cooler at the moment but I plan on moving the postion of the c/cooler so the pipe work run will be very short and get some 80mm pipe work made up.
The manifold has a 80mm x 80mm opening designed for 80mm TB. I thought if I attached my orignal TB to this manifold (which is 70mm i think) I thought I would be strangling power.
I have 3" pipe work from the charge cooler at the moment but I plan on moving the postion of the c/cooler so the pipe work run will be very short and get some 80mm pipe work made up.
marT350T said:
eliot said:
Cant really tell what you are talking about from your profile, but 3" inlet piping flows alot of air.
What engine? power?
The TB is for my mid engined polo. with a Modified 1930cc 20v Turbo with approx 430 bhpWhat engine? power?
What size is the outlet of your turbocharger ?
If its bigger than 80mm, and all plumbing to the TB is 80mm...then perhaps its worth fitting an 80mm TB.....
On the other hand, I'd say it's just plain stupid to do so, and will cost you dearly in throttle control, and gain absolutely no power whatsoever.
If its bigger than 80mm, and all plumbing to the TB is 80mm...then perhaps its worth fitting an 80mm TB.....
On the other hand, I'd say it's just plain stupid to do so, and will cost you dearly in throttle control, and gain absolutely no power whatsoever.
good point, but it makes me wonder why Nissan felt the need to produce a massive throttle body for the Infiniti Q45?
BB-Q said:
good point, but it makes me wonder why Nissan felt the need to produce a massive throttle body for the Infiniti Q45?
Boost.stevieturbo said:
BB-Q said:
good point, but it makes me wonder why Nissan felt the need to produce a massive throttle body for the Infiniti Q45?
Boost.
The Q45 was N/A. Shame- would've been awesome boosted.
BB-Q said:
stevieturbo said:
BB-Q said:
good point, but it makes me wonder why Nissan felt the need to produce a massive throttle body for the Infiniti Q45?
Boost.The Q45 was N/A. Shame- would've been awesome boosted.
totally different ball game
IMO, and Ive said it plenty of times, fitting such a large TB, to such a small boosted engine, is just plain stupid.
You will have no throttle control whatsoever.
It'll probably flow enough air at 25% opening for full power......so essentially, you will have 0-25% throttle control, and 25%-100% makes sweet FA difference.
Edited by stevieturbo on Saturday 11th October 14:32
stevieturbo said:
BB-Q said:
stevieturbo said:
BB-Q said:
good point, but it makes me wonder why Nissan felt the need to produce a massive throttle body for the Infiniti Q45?
Boost.The Q45 was N/A. Shame- would've been awesome boosted.
totally different ball game
IMO, and Ive said it plenty of times, fitting such a large TB, to such a small boosted engine, is just plain stupid.
You will have no throttle control whatsoever.
It'll probably flow enough air at 25% opening for full power......so essentially, you will have 0-25% throttle control, and 25%-100% makes sweet FA difference.
Edited by stevieturbo on Saturday 11th October 14:32
What would be best would be to get someone to flow test a couple of throttle bodies to see at which point they begin to restrict flow. I'll ask on Turbobricks if anyone has done it and post up the results if I'm successful.
430bhp isnt a lot.
Even the Cossie guys know this, and are happy with a TB around 55mm.
You cant compare flow ratings based on n/a, with that of air under pressure.
CSA is all you can go by when it comes to boost....
As the same CSA might flow 100cfm n/a, 200cfm at 1 bar, 300cfm at 2 bar etc etc, all with virtually zero restriction imposed to the actual air at that diameter.
As Ive said, a 75mm standard LS1 TB will happily support over 1000bhp with boost, and has been proven on some 8sec cars.. and others, many times.
Even the Cossie guys know this, and are happy with a TB around 55mm.
You cant compare flow ratings based on n/a, with that of air under pressure.
CSA is all you can go by when it comes to boost....
As the same CSA might flow 100cfm n/a, 200cfm at 1 bar, 300cfm at 2 bar etc etc, all with virtually zero restriction imposed to the actual air at that diameter.
As Ive said, a 75mm standard LS1 TB will happily support over 1000bhp with boost, and has been proven on some 8sec cars.. and others, many times.
Somewhere in and around that, yes..
But fittng huge TB's, when the turbo has a 50mm outlet, and perhaps either 50, or 63mm IC plumbing, or even 76mm plumbing....
Well, its a bit daft fitting a TB with an open CSA far larger than the plumbing in the first place !!
When chances are, the open diameter of the plumbing car far exceed the flow capacity of the engine anyway.
But fittng huge TB's, when the turbo has a 50mm outlet, and perhaps either 50, or 63mm IC plumbing, or even 76mm plumbing....
Well, its a bit daft fitting a TB with an open CSA far larger than the plumbing in the first place !!
When chances are, the open diameter of the plumbing car far exceed the flow capacity of the engine anyway.
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