Anyone got a Megajolt map for a blacktop 2.0l zetec on zx6r bike carbs.
And the carbs were jetted for a 1.8 ST Zetec, anyone know if they will need to be enlarged for the 2.0l? Carbs were originally set up by Chester
sports cars. Also if they do need enlarging will I be able to drive the car without causing any damage, due to running too lean?
Tia
Chris
[Edited on 12/3/12 by ChrisL]
Hi Chris - apologies - I promised you a copy of mine ages ago. I got it off my old PC at the weekend and have just emailed it to you.
Cheers
Stu
quote:
Originally posted by whitestu
Hi Chris - apologies - I promised you a copy of mine ages ago. I got it off my old PC at the weekend and have just emailed it to you.
Cheers
Stu
That map works well on my car. My jets are 1.6mm which seems about right.
Stu
Hi Chris,
A bit of a hijack here.
Do you still have the Chester map? If so, could I have a copy as I have a 1.8 zetec on zx6r carbs.
Len.
Indeed I do. I can either U2U the text to you, it's only ascii, or email you the file?
Let me know either way..
Hi Chris,
U2U sent.
Len.
quote:
Originally posted by whitestu
That map works well on my car. My jets are 1.6mm which seems about right.
Stu
Same here
Cool, cheers for the feedback and map, I guess I just need to work out what my current jets are!
So I took the car to be rolling road tuned by Northampton Motorsport. They advised me to take a dynojet kit.
Being skint / tight I decided to measure the jets to make sure they were at least 1.6 mm, and bought myself a set of micro drill bits. The jets were
bigger than 1.6 but couldn't tell how much bigger as the biggest drill bit was 1.6 mm. So I decided not to bother with the dynojet kit and turned
up for my RR session. At this point I've got to say Northampton Motorsport and Troy in particularly were brilliant and they tried everything to
come up with a solution to what we found, really impressed by them! So what did we find, I hear your cry!
The jets turned out to be much bigger than 1.6mm at almost 1.8mm,
With the needles in the 3rd down position, it's lean most of the way up
With the needles in the top position it's way to rich low down but perfect 3.5K and up to the top
With the needles in the middle (of the two above) position it's ok low down but runs a bit lean at the top. And Troy advised that it would be OK
so long as I don't do sustained top end blasts, so no track days or flat out dual carriageway runs.
As I'm a bit skint at the moment I was thinking of locost solutions.
So you guys running 1.6 jets: are you on the stock needles? What position are they? And have you done a rolling road to check the lambda? (Guessing
Stu' has because of his map's name!)
My thinking is if I get some 1.6mm jets with the needle in its highest position then the top end will be the same with the needle being the restrictor
and the bottom end will be restricted by the now smaller gap between the needle and the jet.
The other option I'm thing is to fit a lambda sensor and either connecting to the megajolt (if its feasible) or some other logging / metering
option and effectively have a constant rolling road!!! But this needs a lot more research ;-)
Any thoughts?
Needles have no affect at WOT, thats where the mains take over.
I would try another 0.5mm increase in the main jet size and see how that goes.
You will need a AFR setup to check it though.
quote:
As I'm a bit skint at the moment I was thinking of locost solutions.
So you guys running 1.6 jets: are you on the stock needles? What position are they? And have you done a rolling road to check the lambda? (Guessing Stu' has because of his map's name!)
Stu,
Will definitely have to take you up on your generous offer! I'll get some 1.6 jets and weld in a lambda sensor mount, guessing it's M18 x
1.5?
Probably take a few weeks to get it sorted.
Cheers
Chris
quote:
Originally posted by whitestu
quote:
As I'm a bit skint at the moment I was thinking of locost solutions.
So you guys running 1.6 jets: are you on the stock needles? What position are they? And have you done a rolling road to check the lambda? (Guessing Stu' has because of his map's name!)
Mine was just set up using a wideband Lambda sensor on the road. The map originally came from someone else who had used an RR, and I played with it until it worked well on my car.
I'm surprised it is lean with 1.8mm jets. As Steve says, WOT mixture should be the same regardless of where the needles are as the needles don't do much at WOT as they should be lifted completely out of the jet.
Mine is if anything a bit rich on 1.6mm jets.
I can let you have a go with my wideband if you like, though you need a bossin your exhaust and bit of time to test things out on the road.
Stu
Hi i don't know if this will help but when i had my zx9r carbs set up at Bogg Brothers they blocked the air correction jets to stop it leaning
the mixture at high revs
Its just a idea that may help you
Jacko
Jacko,
Certainly worth investigating,
cheers
quote:
quote:Originally posted by whitestu
quote:
As I'm a bit skint at the moment I was thinking of locost solutions.
So you guys running 1.6 jets: are you on the stock needles? What position are they? And have you done a rolling road to check the lambda? (Guessing Stu' has because of his map's name!)
Mine was just set up using a wideband Lambda sensor on the road. The map originally came from someone else who had used an RR, and I played with it until it worked well on my car.
I'm surprised it is lean with 1.8mm jets. As Steve says, WOT mixture should be the same regardless of where the needles are as the needles don't do much at WOT as they should be lifted completely out of the jet.
Mine is if anything a bit rich on 1.6mm jets.
I can let you have a go with my wideband if you like, though you need a bossin your exhaust and bit of time to test things out on the road.
Stu
Hi Stu, just out of interest what do you call abit rich?
quote:
Hi i don't know if this will help but when i had my zx9r carbs set up at Bogg Brothers they blocked the air correction jets to stop it leaning the mixture at high revs
Its just a idea that may help you
Jacko