Converting 3.0 engine to modern fuel injection
06-13-2017, 05:53 PM
#16
Rennlist Member
98mm.
Here's an article:
http://www.butzisquared.com/2014/11/...ke-911-engine/
Henry Schmidt/Supertec
http://forums.pelicanparts.com/911-e...oke-3-2-a.html
Here's an article:
http://www.butzisquared.com/2014/11/...ke-911-engine/
Henry Schmidt/Supertec
http://forums.pelicanparts.com/911-e...oke-3-2-a.html
06-19-2017, 12:24 PM
#18
Instructor
Thread Starter
The conversion to 3.2 you are pointing out seems quite interesting. Do you know if Mahle pistons offer sufficient clearance to use higher-lift camshafts?
On another front, I'm wondering what sort of approach is used for a modern fuel injection with individual throttle bodies. Are the fuel and ignition maps based mainly on engine rpm and throttle position?
On another front, I'm wondering what sort of approach is used for a modern fuel injection with individual throttle bodies. Are the fuel and ignition maps based mainly on engine rpm and throttle position?
06-19-2017, 02:58 PM
#19
Addict
The maps are based on throttle position, RPM, load, AFR and control fuel and timing advance. I've tried to figure it out and it's way beyond me. I've got a chip with multiple maps from no-start to valet to 93 octane and several points in between. Crazy world
06-19-2017, 03:31 PM
#20
Rennlist Member
Has there been a consensus on the best all-around system?
I've have an acquaintance that used a Megasquirt with a 3.2 manifold on his SC. Prefer not to chase parts. Plug and play is best.
Pat Williams does a nice job on Turbos and uses PMO throttle bodies on his normally aspirated cars. Al Kosmal has used ITB's (Triumph or Jenvey?) and there are at least a half dozen more out here. Rothsport uses Jenvy. Then there's Borla (TWM), KMS etc. etc. etc.
It comes down to the tuning/tuner. No way to do this without a dyno, imho. I've seen a 3D graphic of a hot Honda tune and I was like a deer in the headlights.
Don't want to be a luddite but I do understand carburetors. A well designed and well tuned EFI system will be hard to beat. Set it and forget it?
I've have an acquaintance that used a Megasquirt with a 3.2 manifold on his SC. Prefer not to chase parts. Plug and play is best.
Pat Williams does a nice job on Turbos and uses PMO throttle bodies on his normally aspirated cars. Al Kosmal has used ITB's (Triumph or Jenvey?) and there are at least a half dozen more out here. Rothsport uses Jenvy. Then there's Borla (TWM), KMS etc. etc. etc.
It comes down to the tuning/tuner. No way to do this without a dyno, imho. I've seen a 3D graphic of a hot Honda tune and I was like a deer in the headlights.
Don't want to be a luddite but I do understand carburetors. A well designed and well tuned EFI system will be hard to beat. Set it and forget it?
02-03-2021, 05:48 PM
#22
Rennlist Member
The one with most people who understand how to tune it.
That's where you can spend thousands getting right. Megasquirt has a lot of users but there are others.
Putting EFI on isn't rocket science but tuning it is and you most definitely need a dynamometer to get all parameters right.
I think that's what holds it back for a lot of people. That and cost.
I heard Jeff Gamroth did some testing with Webers and made a lot of horsepower. I have a friend with a very hot twin plug 2.7 track/street car with 46mm Webers which were tuned by Scott McPherson at Automobile Associates.
He says he can get into the 20's fuel mileage wise. Thats pretty darn good. I know Scott and he is fastidious.
That's where you can spend thousands getting right. Megasquirt has a lot of users but there are others.
Putting EFI on isn't rocket science but tuning it is and you most definitely need a dynamometer to get all parameters right.
I think that's what holds it back for a lot of people. That and cost.
I heard Jeff Gamroth did some testing with Webers and made a lot of horsepower. I have a friend with a very hot twin plug 2.7 track/street car with 46mm Webers which were tuned by Scott McPherson at Automobile Associates.
He says he can get into the 20's fuel mileage wise. Thats pretty darn good. I know Scott and he is fastidious.