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FoundSoul Samba Member
Joined: October 17, 2008 Posts: 9 Location: Suwanee, GA 30024
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Posted: Fri Sep 23, 2022 2:01 pm Post subject: New EFI Tuners Guide Article Series you might find helpful.... |
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Heads up all, Jerry Hoffmann from DIYAutoTune here - it's been a while since I've posted here but I wanted to see what ya'll think of this new articles series. Hoping to add a new chapter every two or three weeks, with the goal being to aid and equip our customers to learn the ins and outs of EFI Installation, Tuning and Configuration, and eventually I'll get into case studies converting different vehicles to one of our Standalone Engine Management Systems, documenting the process, and posting it up to help others follow along. I've got a shop full of cars I can play with when I get to that point, should have something for everyone.
Check it out....
EFI Tuners Guide – Overview and Table of Contents
Chapter 1: Why should you convert to Electronic Fuel Injection?
Chapter 2: Why should you convert to Electronic Ignition Control?
Chapter 3: Garbage In, Garbage Out: A properly installed, configured, and tuned Engine Management System makes all the difference! (three stages of success)
Chapter 4: Electronic Fuel Injection Options – Throttle Body Injection (TBI), MultiPort Fuel Injection (MPFI), Sequential Point Fuel Injection (SPFI), and Direct Injection (DI)
Other topics I plan to cover are in the Table of Contents. What's missing? _________________ Jerry a.k.a. 'FoundSoul'
http://www.DIYAutoTune.com |
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buguy Samba Member
Joined: November 17, 2003 Posts: 4915 Location: Port Orange, FL
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Posted: Sat Sep 24, 2022 6:34 am Post subject: Re: New EFI Tuners Guide Article Series you might find helpful.... |
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I haven't had a chance to read through it well yet, but something i see asked a lot is about TB sizing for a given engine. Is there any math/science for that? |
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FoundSoul Samba Member
Joined: October 17, 2008 Posts: 9 Location: Suwanee, GA 30024
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Posted: Sat Sep 24, 2022 8:05 am Post subject: Re: New EFI Tuners Guide Article Series you might find helpful.... |
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buguy wrote: |
I haven't had a chance to read through it well yet, but something i see asked a lot is about TB sizing for a given engine. Is there any math/science for that? |
It's a lot more forgiving than carb sizing, but there is something to be said for sizing the throttle body. Obviously too small is going to show up as a restriction, which on a naturally aspirated vehicle could be seen in the datalogs as manifold pressure never reaching at/near ambient pressure under full throttle because the engine is ingesting more air than the throttle body can allow in. At the other extreme, too large of a throttle body, the main challenge would be trying to make small throttle movements with a large throttle blade... a small movement can allow much more air in much more quickly, creating some challenges with transients (changes in throttle position). If it's not too extreme, it can be tuned for. If it's the equivalent of an on/off valve though, no air or all the air, drivability will suffer. It might work on a pure drag car, but maybe nowhere else.
It's pretty forgiving though with EFI. I'm speaking of extremes here in order to find examples where it will impact you, at least on the big side. If it's big enough, and not stoopid big, it'll be fine. _________________ Jerry a.k.a. 'FoundSoul'
http://www.DIYAutoTune.com |
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buguy Samba Member
Joined: November 17, 2003 Posts: 4915 Location: Port Orange, FL
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Posted: Sat Sep 24, 2022 11:09 am Post subject: Re: New EFI Tuners Guide Article Series you might find helpful.... |
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Yeah on my old 1600 turbo with a 50mm TB, i could reach over 30 psi of boost at less than 30% throttle. Wasn't bad to drive though. Not like a light switch at all. |
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Chip Samba Member
Joined: July 19, 2008 Posts: 967 Location: Utah
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Posted: Sat Sep 24, 2022 12:56 pm Post subject: Re: New EFI Tuners Guide Article Series you might find helpful.... |
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Thanks for putting this together Jerry! The little bit I've looked through was very well written. I have the book you published a decade ago as well. I appreciate the effort you've gone through to get this stuff available to the masses. |
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Paul.H Samba Member
Joined: April 03, 2015 Posts: 613 Location: England
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Posted: Tue Sep 27, 2022 3:05 am Post subject: Re: New EFI Tuners Guide Article Series you might find helpful.... |
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buguy wrote: |
I haven't had a chance to read through it well yet, but something i see asked a lot is about TB sizing for a given engine. Is there any math/science for that? |
IDF pattern throttles
36mm 160-170hp
38mm 180hp
40mm 200hp
45mm more than any dual port head will flow
99% of engines are sub 150hp and spend 99% of the time below full throttle |
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panel Samba Member
Joined: December 02, 2001 Posts: 1090 Location: Victoria B.C. Canada
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Posted: Tue Sep 27, 2022 6:29 pm Post subject: Re: New EFI Tuners Guide Article Series you might find helpful.... |
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buguy......were you asking about single TB size or dual carb style(ITB) so 4 x throttle plates? _________________ My '65-Subaru EJ20 Turbo conversion |
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buguy Samba Member
Joined: November 17, 2003 Posts: 4915 Location: Port Orange, FL
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Posted: Tue Sep 27, 2022 6:35 pm Post subject: Re: New EFI Tuners Guide Article Series you might find helpful.... |
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Really wasn't asking for anything specific. Just something i see asked pretty often. I would think there is some math that could be done to figure out the cfm requirement an engine needs. Or maybe there is a calculator. Then that could be applied to single or dual TB's. |
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DerrickfromNC1 Samba Member
Joined: October 24, 2008 Posts: 1293 Location: North Carolina
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Posted: Tue Sep 27, 2022 7:35 pm Post subject: Re: New EFI Tuners Guide Article Series you might find helpful.... |
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Paul.H wrote: |
buguy wrote: |
I haven't had a chance to read through it well yet, but something i see asked a lot is about TB sizing for a given engine. Is there any math/science for that? |
IDF pattern throttles
36mm 160-170hp
38mm 180hp
40mm 200hp
45mm more than any dual port head will flow
99% of engines are sub 150hp and spend 99% of the time below full throttle |
Are these IDF throttle body figures for a single or pr of throttle bodies? |
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67rustavenger Samba Member
Joined: February 24, 2015 Posts: 9665 Location: Oregon
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Posted: Tue Sep 27, 2022 9:18 pm Post subject: Re: New EFI Tuners Guide Article Series you might find helpful.... |
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DerrickfromNC1 wrote: |
Paul.H wrote: |
buguy wrote: |
I haven't had a chance to read through it well yet, but something i see asked a lot is about TB sizing for a given engine. Is there any math/science for that? |
IDF pattern throttles
36mm 160-170hp
38mm 180hp
40mm 200hp
45mm more than any dual port head will flow
99% of engines are sub 150hp and spend 99% of the time below full throttle |
Are these IDF throttle body figures for a single or pr of throttle bodies? |
What about a, force fed 50mm TB?
Will 42 x 37 heads, choke? _________________ I have learned over the years.
Cheap parts are gonna disappoint you.
Buy Once, Cry Once!
There's never enough time to do it right the first time. But there's always enough time to do it thrice.
GFY's Xevin and VW_Jimbo! |
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Paul.H Samba Member
Joined: April 03, 2015 Posts: 613 Location: England
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Posted: Tue Sep 27, 2022 10:14 pm Post subject: Re: New EFI Tuners Guide Article Series you might find helpful.... |
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DerrickfromNC1 wrote: |
Paul.H wrote: |
buguy wrote: |
I haven't had a chance to read through it well yet, but something i see asked a lot is about TB sizing for a given engine. Is there any math/science for that? |
IDF pattern throttles
36mm 160-170hp
38mm 180hp
40mm 200hp
45mm more than any dual port head will flow
99% of engines are sub 150hp and spend 99% of the time below full throttle |
Are these IDF throttle body figures for a single or pr of throttle bodies? |
That's for a pair of IDF throttle bodies |
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Paul.H Samba Member
Joined: April 03, 2015 Posts: 613 Location: England
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Posted: Tue Sep 27, 2022 11:32 pm Post subject: Re: New EFI Tuners Guide Article Series you might find helpful.... |
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67rustavenger wrote: |
DerrickfromNC1 wrote: |
Paul.H wrote: |
buguy wrote: |
I haven't had a chance to read through it well yet, but something i see asked a lot is about TB sizing for a given engine. Is there any math/science for that? |
IDF pattern throttles
36mm 160-170hp
38mm 180hp
40mm 200hp
45mm more than any dual port head will flow
99% of engines are sub 150hp and spend 99% of the time below full throttle |
Are these IDF throttle body figures for a single or pr of throttle bodies? |
What about a, force fed 50mm TB?
Will 42 x 37 heads, choke? |
It'll work OK |
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