N-Tune
10-10-2012, 02:26 AM
#331
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Ok.
So I think I have the next dyno / modification planned.
I will try a reground camshaft that is fairly aggressive. I will also put on a true adjustable cam-gear to dial in the new cam.
It won't be this weekend, but maybe next.
So I think I have the next dyno / modification planned.
I will try a reground camshaft that is fairly aggressive. I will also put on a true adjustable cam-gear to dial in the new cam.
It won't be this weekend, but maybe next.
10-10-2012, 02:42 AM
#332
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So I just got awesome news from the Targa Australia team.
I am able to change over to a MAF from ye olde barn door.
However, to clarify, as my car is a ROW, it does not have an O2 sensor. Would a lambda sensor be required to install the later DME and MAF kit?
The car is a 1983 944 delivered to Australia.
I am able to change over to a MAF from ye olde barn door.
However, to clarify, as my car is a ROW, it does not have an O2 sensor. Would a lambda sensor be required to install the later DME and MAF kit?
The car is a 1983 944 delivered to Australia.
10-10-2012, 02:54 AM
#334
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So I just got awesome news from the Targa Australia team.
I am able to change over to a MAF from ye olde barn door.
However, to clarify, as my car is a ROW, it does not have an O2 sensor. Would a lambda sensor be required to install the later DME and MAF kit?
The car is a 1983 944 delivered to Australia.
I am able to change over to a MAF from ye olde barn door.
However, to clarify, as my car is a ROW, it does not have an O2 sensor. Would a lambda sensor be required to install the later DME and MAF kit?
The car is a 1983 944 delivered to Australia.
But having an O2 sensor will help get better fuel mileage and emissions.
Also, when you say that you got news from the Targa Australia team, are you saying that the sanctioning body approves the swap to a MAF?
Ok thanks, so not any appreciable gain there...
Last edited by Rogue_Ant; 10-10-2012 at 03:23 AM.
10-10-2012, 08:02 AM
#336
Three Wheelin'
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Take a look though at the casting marks, and the steep lip on the n/a tb. (where it severely steps down to the size of the throttle plate.) I used a die grinder, and reshaped all of that area. Including the outside lip (the rubber boot fits over the body) All to reduce turbulance. I obviously can't change the size of the throttle plate..not easily anyways so I opted to make the transitions as gentle as possible, and match the tb outlet to the manifold...it doesn't match very well with as much as 2mm of mismatch between the flanges.
On the subject of performance. IF we have to keep the jboot, does anyone make one without all the "crinkles" inside? Something smoother inside to help air make that sharp turn (sharp bends drastically reduces air velocity)
Please note that bigger isn't always better on an n/a. Keeping air velocity up is more important. Stepping up to a tb that is too large can introduce off idle bogs as the throttle plate begins to open, though I doubt a 60mm tb would be too large to cause this to issue to arrise...70-80mm on a street car may cause some issues.
10-10-2012, 12:39 PM
#339
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come on spencer you should know how to use google to search. unless you have a iphone..... 
http://forums.pelicanparts.com/porsc...body-size.html
http://forums.pelicanparts.com/porsc...body-size.html
10-10-2012, 06:19 PM
#343
Three Wheelin'
did some more measuring. the na inlet port on the intake(behind the throttle body) is 59mm. the 951 intake is 61mm
Last edited by MooreBoost; 10-10-2012 at 06:43 PM.
10-10-2012, 06:49 PM
#344
While guesswork is not a substitute for measurement, my guess is that the throttle body size increase was not a coincidence - the Porsche wizards would have sized it to peak HP targets.
However, there's more to sizing the throttle than flow - the bigger the butterfly the more area of the throttle opens per degree. It changes the way the throttle responds to input. There's also the issue of turbulence, but given the placement in the stock 944 system that doesn't seem too much of an issue.
(Just noticed ZR8ED mentioned this too)
The J-boot might not be too much of a restriction - it's pretty wide, and airflow tends to adhere to the sides of a tube anyhow, leading to the fast moving portion being in the centre. That said I think the turbulence induced from the bumpy sides could be a bad thing in combination with the j bend - air could be stalled in the turn.
Cam and true cam timing will introduce a big boost - waiting to see what that brings. It's cool to know that there may be options for all budgets - just the maf and a cam key, then go to a new cam and cam gear later on. I've got to dig out those bike throttles I was playing with...
However, there's more to sizing the throttle than flow - the bigger the butterfly the more area of the throttle opens per degree. It changes the way the throttle responds to input. There's also the issue of turbulence, but given the placement in the stock 944 system that doesn't seem too much of an issue.
(Just noticed ZR8ED mentioned this too)
The J-boot might not be too much of a restriction - it's pretty wide, and airflow tends to adhere to the sides of a tube anyhow, leading to the fast moving portion being in the centre. That said I think the turbulence induced from the bumpy sides could be a bad thing in combination with the j bend - air could be stalled in the turn.
Cam and true cam timing will introduce a big boost - waiting to see what that brings. It's cool to know that there may be options for all budgets - just the maf and a cam key, then go to a new cam and cam gear later on. I've got to dig out those bike throttles I was playing with...
10-10-2012, 09:29 PM
#345
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Josh :
I need my car to appear 100% stock. Can a stock AFM be gutted and fitted with your MAF sensor (possibly sleeved or gutted and 'wrapped' around your tube) ?
I need my car to appear 100% stock. Can a stock AFM be gutted and fitted with your MAF sensor (possibly sleeved or gutted and 'wrapped' around your tube) ?