build thread: 16v + cbr900 carbs + high compression

[bmwquick]

Who told you that BS??

My Bentley. And OP, which said "The box on the top of the throttle bodies controls fuel flow, in combination with the fuel pump." The Fuel pump flow is directly proportional to engine rpm". Is that not that varying fuel pressure? CIS just varies pressure using the "flap" meter.

[woodrowstar]

No. It is not. CIS is Pulse generated. Hilborne is metered by metering jets much like a throttle position switch. the pump is no different then a power steering pump, making reliable PSI versus a block mounted mechanical pump using an eccentric or push rod.

[yeayeayea]

I will say I have very little idea how the hilborn stuff works, and I doubt I will ever run it. But it is cool oldschool race parts that I saved from going in the trash

was going to take some video of the car today but the rigged throttle cable is preventing me from doing so

[yeayeayea]

So its time to make a new throttle cable, since my bicycle brake cable finally died.

I am using a honda hood release cable, as it has the right size barrel end for the cbr900 carbs


It has a barrel on one end and a ball on the other, i cut the ball off


next I cut the J hook off the stock cable, and drilled out the cable that was left crimped inside it


Here is what ends I will have once I determine my length


hopefully tomorrow I will cut it to the right length and crimp and solder the j hook on and have a nice new throttle cable with no cable clamps anywhere

[yeayeayea]

Also, now that I have my wideband hooked up I was wondering what A/f's i should be shooting for? Im in the 14's right now, but from what ive been reading the optimum a/f is in the high 12's to low 13's range.

Guess it is time to play with needle jet settings

[yeayeayea]

here is a link to a cbr 900 rr parts catalog and a cbr 900 rr manual, both of which should be helpful to anyone using these carbs

http://moto.gazovisistemi.com/

[yeayeayea]

Over the past week



which managed to leak nearly all of my 2 day old mobil 1 all over the engine bay. which got all over the car. So a trip to the car wash was necessary once the leaking stopped.






Decided to take a short exhaust sound video. Exhaust is a Eurosport cat delete header, to 2.25" TT exhaust with a borla muffler and 1 resonator.



I also played with the needle heights, I took plenty of pictures on how to adjust them. I went two notches from stock, and while this made my WOT A/fs a bit better (now in the high 13:1 range), it has made my crusing AF's to be a bit rich and some misfiring if I try to accelerate in 5th gear at low speeds. Going to set it back to stock and redrill my mains to a 1.78mm and go from there with the needle tuning. I will take pics of the whole process and post a DIY of sorts

[vwbeaner]

This is fantastic, I have always loved your car and itb's and carbs sound wicked.

[yeayeayea]

Thanks

I took the car to bugout 69 and did some bracket racing, ran 8 times with a best of 10.02 in the 1/8th mile, clutch slipping the whole time. Still not fast enough, but I had a sparkplug fail on the way home. I dont know if it was broke while racing, but it became problematic on the ride home. The ceramic separated from the steel threads. Swapped an old plug back in, hopefully it will make it to work tomorrow. First time driving it in 24 days.


As for bike carb content, I have picked up 2 bikes since then A yamaha SECA 1 and a yamaha SECA 2

Seca 1:


Seca 2:



Already rejetted the SECAII, it had stage 3 mains and the only mod was a ****ty custom "exhaust", put some stage 1 mains in and it runs soooo much better.

[jtablerd]

What's up wes - long time! Looks like the new project is going well...I'm currently using an 85 4dr as my daily (8v, carb/straight pipe/coils), have been without a german car for awhile.

Let me know if you're ever near north beach with that thing, would love to see it!

-john

[yeayeayea]

What's up wes - long time! Looks like the new project is going well...I'm currently using an 85 4dr as my daily (8v, carb/straight pipe/coils), have been without a german car for awhile.

Let me know if you're ever near north beach with that thing, would love to see it!

-john

Long time no talk john! I take it you sold your jetta?
you have an 85 vw? or 85 something else?

[jtablerd]

Yea man after a few years away rob & I picked up an 85 golf for autocross duty, but I'm dailying her for now...there's a cruise-in here in north beach every Friday but too many american cars - we should invade one weekend, would love to see your 16v in person.

[Turbo3]

Also, now that I have my wideband hooked up I was wondering what A/f's i should be shooting for? Im in the 14's right now, but from what ive been reading the optimum a/f is in the high 12's to low 13's range.

Guess it is time to play with needle jet settings

Alll the guys i know with N/A cars run an AFR in the lower 13 range.

Thanks

I took the car to bugout 69 and did some bracket racing, ran 8 times with a best of 10.02 in the 1/8th mile, clutch slipping the whole time. Still not fast enough, but I had a sparkplug fail on the way home. I dont know if it was broke while racing, but it became problematic on the ride home. The ceramic separated from the steel threads. Swapped an old plug back in, hopefully it will make it to work tomorrow. First time driving it in 24 days.

I seen your car at bug out, that really made me want to go carbs. And 10.02 with the clutch slipping is damn quick.

[yeayeayea]

Alll the guys i know with N/A cars run an AFR in the lower 13 range.



I seen your car at bug out, that really made me want to go carbs. And 10.02 with the clutch slipping is damn quick.

Thanks man, yeah im in the 13's now with some needle height adjustment. it pulls pretty nicely now, just gotta tackle that clutch and install the LW flywheel. Then its back to the dragstrip

[yeayeayea]

Yea man after a few years away rob & I picked up an 85 golf for autocross duty, but I'm dailying her for now...there's a cruise-in here in north beach every Friday but too many american cars - we should invade one weekend, would love to see your 16v in person.

Any pics of said golf? and what is this cruise in you speak of?

[Turbo3]

Thanks man, yeah im in the 13's now with some needle height adjustment. it pulls pretty nicely now, just gotta tackle that clutch and install the LW flywheel. Then its back to the dragstrip

What's the break down of that 10.02 time slip?

[yeayeayea]

What's the break down of that 10.02 time slip?

uhhh awful launch and some other numbers haha. i think it was like a 2.2 or 2.3 60ft. at 68 or 69 mph i think

[Turbo3]

Anyone running really high compression 12.x:1 or higher?

[jtablerd]

Wes, the north beach farmers mks closes down a couple blocks by the boardwalk and there's a cruise in for it - 40-50 cars, most american, some cool. Rob and his wife just bought a houseup the street too, he's driving a 91 m5 and a 93 s4 these days

Photos of the beast are below

[yeayeayea]

i didnt pass you in that thing last wednesday did i? down in st marys county, you would have been heading north on 235 while i was going south through hollywood.

[mudanddust]

im into this! im doing the same swap right now! i have carbs and motor... where did you buy the 16v intake flange?

i made the flange and still have some steel and aluminum ones if your still interested

[yeayeayea]

i made the flange and still have some steel and aluminum ones if your still interested

This is true

[OrangeDUB]

So without reading back through your whole thread, what is your fuel pump setup?

[yeayeayea]

Stock intank pump, high pressure pump under the car removed, filter put in its place. Mr gasket fpr mounted under the hood.

[OrangeDUB]

Stock intank pump, high pressure pump under the car removed, filter put in its place. Mr gasket fpr mounted under the hood.

What pressure were you seeing directly from the stock in-tank pump and what did you have to drop it down to in order to not overflow the carbs? I remember fuel spilling out the carb mouths way back when you first got it running in your photobucket vids and think you must have installed the FPR afterwards... If I'm remembering the right one of us?

I'm wondering what my mk1 in-tank pump is putting out... If there is one! It was formerly a CiS 8v

[yeayeayea]

What pressure were you seeing directly from the stock in-tank pump and what did you have to drop it down to in order to not overflow the carbs? I remember fuel spilling out the carb mouths way back when you first got it running in your photobucket vids and think you must have installed the FPR afterwards... If I'm remembering the right one of us?

I'm wondering what my mk1 in-tank pump is putting out... If there is one! It was formerly a CiS 8v

that was on the holley fpr some people use, and because the carbs were mounted too far on a downward angle. The fuel pressure gauge i have never moves off 0 psi.

[Abstract_99]

hiyah guyz

[yeayeayea]

hola

[OrangeDUB]

How is the VW doing? I've been tinkering around with my rabbit lately and wanna get it on the road. Need to buy:
1. fuel pump
2. FPR
3. fuel pressure gauge

any thoughts? I don't think I have an in-tank pump but I may be wrong. I guess I'll have to look at that before I go buying anything

[yeayeayea]

How is the VW doing? I've been tinkering around with my rabbit lately and wanna get it on the road. Need to buy:
1. fuel pump
2. FPR
3. fuel pressure gauge

any thoughts? I don't think I have an in-tank pump but I may be wrong. I guess I'll have to look at that before I go buying anything

Im just using the Mr gasket FPR, it has a round adjustment knob on top that you can turn by hand, no tools needed. As for a fuel pressure gauge, I had one but it never read above 0psi, so I removed it.


As for my gti, it has been parked in the woods next to my house for a couple months. Actually goign to try and start it up and park it back by the garage and start getting it ready for spring

[mudanddust]

i am using a mallory fpr and gage that a buddy of mine gave my, havent got the thing running yet so im not sure how its gona work exactly, but i recently got the motor completely done and ready to go into the rabbit. I am not putting the yosh pipe on it fyi, just thought it would be a funny pic

[yeayeayea]

I want that intake manifold!

[mudanddust]

how much u willing to pay for one?

[yeayeayea]

Im not! haha I have everything I would need to make one. My steel one is working fine, yours is just better looking than mine!

[badazzgti88]

When is the last time that car was even started Wes?


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