Printable Version | Subscribe | Add to Favourites
New Topic New Poll New Reply
Author: Subject: Megajolt ignition map for Zetec Blacktop
Streetfighterpete

posted on 21/1/20 at 10:18 PM Reply With Quote
Megajolt ignition map for Zetec Blacktop

Hi guys,

Has anyone got a map download for a Megajolt to suit a 2.0 Zetec blacktop running bike carbs please? I'm using the MAP type unit with 40mm carbs off a GSXR1100. I have Kent fast road cams in it.

Any help gratefully accepted.

Cheers,

Pete

View User's Profile View All Posts By User U2U Member
SJ

posted on 22/1/20 at 09:00 AM Reply With Quote
I have one saved somewhere

It's definitely on the car [2.0 BT, zx6 carbs] and should be saved on a hard drive somewhere. Let me try to dig it out.

Mine is standard cams though.

View User's Profile View All Posts By User U2U Member
Davedew

posted on 22/1/20 at 01:34 PM Reply With Quote
Below is the ignition table I use with my Blacktop on GSXR600 carbs & standard cams.

MAP
MAP






http://s831.photobucket.com/user/davemdew/library/Haynes%20Roadster%20Pictures

View User's Profile View All Posts By User U2U Member
johnemms

posted on 25/1/20 at 11:19 AM Reply With Quote
Isn't that a TPS not MAP map ?

map : manifold absolute pressure sensor
TPS : Throttle position sensor

[Edited on 25/1/20 by johnemms]





Own chassis & Build - First time pass!!
"7's" aren't really "cars", they are 'experiences"

View User's Profile E-Mail User View All Posts By User U2U Member
SJ

posted on 25/1/20 at 11:30 AM Reply With Quote
Mine's a TPS map as well
View User's Profile View All Posts By User U2U Member
Davedew

posted on 25/1/20 at 04:30 PM Reply With Quote
Yep it's a TPS map.
Ignition timing would be similar, just different load scale I guess





http://s831.photobucket.com/user/davemdew/library/Haynes%20Roadster%20Pictures

View User's Profile View All Posts By User U2U Member
johnemms

posted on 26/1/20 at 03:21 PM Reply With Quote
I'm taking my TPS Megajolt off and swapping it for a MAP Megajolt MK2
Also changing cylinder head for bigger valved head..
Then off to get it mapped on RR..
That's why I was looking at MAP & TPS ..

https://www.autosportlabs.com/product/megajolte-mk2_crank_fired_ignition/







Own chassis & Build - First time pass!!
"7's" aren't really "cars", they are 'experiences"

View User's Profile E-Mail User View All Posts By User U2U Member
paulf

posted on 26/1/20 at 06:21 PM Reply With Quote
I used too run a map based megajolt for ignition and although it was ok with a downdraught carb i found it difficult to get a smooth running map with throttle bodies using map based load. i persevered with it for a while but eventually changed to tps and found it a lot easier to map.
I think bike carbs would have the same problem in that idle has a good vacuum but once off idle thereis little resolution between part and full throttle.
Paul.
quote:
Originally posted by johnemms
I'm taking my TPS Megajolt off and swapping it for a MAP Megajolt MK2
Also changing cylinder head for bigger valved head..
Then off to get it mapped on RR..
That's why I was looking at MAP & TPS ..

https://www.autosportlabs.com/product/megajolte-mk2_crank_fired_ignition/



View User's Profile View All Posts By User U2U Member
johnemms

posted on 26/1/20 at 06:42 PM Reply With Quote
I do like to mess
I've got the 4 inlets tapped (where i balance the carbs)..
Made a rail with 3 one way 4mm valves and 1 always open valve furthest away..
Description
Description


Some silicone tube & straight swap Megajolt MK2..
Looking forward to fooling about with it
If it sucks - next project will be fuel injection

A quick thought..
Do throttle bodies have a fixed venturi with just an injector and a butterfly.. where as..
Bike carbs have a butterfly but a 'variable slide' venturi which may give a better vacuum for the megajolt sensor to work with ?


[Edited on 26/1/20 by johnemms]





Own chassis & Build - First time pass!!
"7's" aren't really "cars", they are 'experiences"

View User's Profile E-Mail User View All Posts By User U2U Member
paulf

posted on 26/1/20 at 10:30 PM Reply With Quote
Im sure you will be able to get it to run reasonably with MAP but i think the carb slides may be more of a hinderance than a help as they will be another variable affecting the map signal.
I ran with a MAP megajolt with a downdraught carb and then when i changed to injection kept it to do the ignition and connected as per your idea. iI spent a couple of years playing with mapping thinking MAP load would be better, and then converted my ECU to do the ignition control as well and changed to TPS load sensing to see what the difference would be, I managed to get a much smoother throtttle response with no flat spots almost straight away.
Paul.
quote:
Originally posted by johnemms
I do like to mess
I've got the 4 inlets tapped (where i balance the carbs)..
Made a rail with 3 one way 4mm valves and 1 always open valve furthest away..
Description
Description


Some silicone tube & straight swap Megajolt MK2..
Looking forward to fooling about with it
If it sucks - next project will be fuel injection

A quick thought..
Do throttle bodies have a fixed venturi with just an injector and a butterfly.. where as..
Bike carbs have a butterfly but a 'variable slide' venturi which may give a better vacuum for the megajolt sensor to work with ?


[Edited on 26/1/20 by johnemms]

View User's Profile View All Posts By User U2U Member

New Topic New Poll New Reply


go to top






Website design and SEO by Studio Montage

All content 2001-16 LocostBuilders. Reproduction prohibited
Opinions expressed in public posts are those of the author and do not necessarily represent
the views of other users or any member of the LocostBuilders team.
Running XMB 1.8 Partagium [ 2002 XMB Group] on Apache under CentOS Linux
Founded, built and operated by ChrisW.