I have fitted a silvertop 2l Zetec with Zx9 carbs running megajolt and map sensor, the carbs were sent to Bogg brothers to be jetted and put on the
car, the car idles well and drives well upto about 65-70mph, then it really struggles unless you gradually build speed slowly by backing off the
throttle.
The carbs are Keihin CVK marked with 94 (presume 1994) Serial: G067A1DB, They have been fitted with 160 main jets.
My question is that when Bogg Bros jet them do they jet them so they are too rich to prevent engine damage?
My brother is running an identical setup but has used 170 main jets and his pulls right through 70mph well.
I should really get my car rolling roaded but have not got the cash atm,
Are these symptoms likly to my car been to rich or lean? do i drill my jets to 170?
Have a look at the plugs after a run at 60mph. If black, it is rich, if very pale, then lean. Lean is very bad
I would hope if they were supplied jetted, they would be rich rather than lean.
However, best bet is a session on the rollers, or beg/borrow/steal a wideband lambda setup so you can test it on the road.
This could save the engine....guesswork is non too helpful.
mines a 1.8 silvertop with megajolt, I believe this has 1.6 jets when its floored it is fuel rich as you can smell the juice. I would redrill your jets and ensure you have the same map. PS have you connected TPS ??
What size jet would you think is about right?
Make sure the main jets are tight, one of mine fell out!! It had the same problem as yours
Is the air correction holes blocked ?boggs told me this stops the carbs going week at high revs
why not give boggs a phone call and ask there advice thats what i would do
Jacko
If I remember my conversations with BB, they recomend a rolling road before 'proper driving' as the initial jetting is just to get it
running.
My 1.8 silvertop with ZX6R carbs have 1.6 jets and they told me 'that's a good starting point'. ( still building the engine at the
moment)
Len.
It needs to be on a rolling road
my pinto is a 2+L on zx9r / E carbs and has 1.7 mm main jets
My Blacktop Zetec 2.0 ltr is running Bandit 1200 carbs and main jets are 1.5 runs well and gives me 45 MPG.
Regards
Bob
quote:
Originally posted by avagolen
If I remember my conversations with BB, they recomend a rolling road before 'proper driving' as the initial jetting is just to get it running.
Today is tried various min jets including 1.7mm which ran really smooth, and 1.8mm, the jets fitted by Bogg Bros when i checked they were marked at
different sizes however i think they have drilled them to a size (Unknown), with all the jets the same problem occured, when in high revs with foot
down hard the car stutted and backed off, it will accelerate if i back of but more like a gradual build up, i then decided to block the air correctors
up by bunging matchsticks into the four holes, this did improve things however the hesitation is still there, any ideas what to do next?
How has everyonr elseblocked there air correctors?
Is your TPS set up correctly, if it accelerates on back off it seem like it could be over rich or that the timing is slightly out
Im using a maf sensor setup, my brothers runs fine, same setup but his carbs came already dynojetted,
im going to try the jets that Boggs fitted and block to air correctors tommorow, You think it maybe rich, i thought it was becoming lean at high revs,
thats why i blocked the air correctors which helped
I have ended up with 135 dgav main jets in my ZX9R C1 carbed cossie YB, have dynojet needles in and airs blocked (were blocked when I got them), Pulls
all the way on WOT from 2500 with 12:1 afr to near the 7250rpm red line, does start to creep towards 13.5:1 on the last 1000 rpm.. I tried all the
suggested 180+ jets recommended for 2.0L and it ran so rich all over the shop! Felt really boggy and the afr was was off the scale which is 8:1 on any
WOT. Getting 35 to the gallon and I'm not fannying around.
What advance do you have got on full wot? Take a screen shot of your megajolt map and stick it up, some peeps will be able to advise maybe?
Check for air leak?
quote:
Originally posted by kylerichmond
Im using a maf sensor setup