build thread: 16v + cbr900 carbs + high compression

[Dave926]

I looked at your other post in the bike carb write up thread, how did you get your pressure so low?

I had a holley 1-4psi reg and a mr gasket fuel filter, it would not go under 2 psi when i ran the stock intank. The second time i tried my old mikuni's i used a ball valve for ****s and giggle and it still poured fuel down the bowls.

[yeayeayea]

http://forums.vwvortex.com/showthrea...Carb-Questions

anyone who wants info on a bike carb setup, started the thread, glad someone took it somewhere.

thank you for linking that here. that thread was pretty valuable in getting my project started

[yeayeayea]

I looked at your other post in the bike carb write up thread, how did you get your pressure so low?

I had a holley 1-4psi reg and a mr gasket fuel filter, it would not go under 2 psi when i ran the stock intank. The second time i tried my old mikuni's i used a ball valve for ****s and giggle and it still poured fuel down the bowls.

What year is your car? my car was cis so the stock in tank pump was a low pressure pump and it had an external high pressure pump mounted under the car. if your car is EFI stock, your intank pump may be different. I know the mk3's only have one pump, the intank, so it must be a high pressure intank pump.

[tjcantone]

what octane are you running for 11:1?

[yeayeayea]

what octane are you running for 11:1?

Just 93 with the ignition advanced as far as it will go.


In other news, I got some plate aluminum and almost finished setting up my new bandsaw so the fabrication is about to get started. going to a more motorsport approach I believe. should be even more fun to drive!

[markaviles]

Just 93 with the ignition advanced as far as it will go.


In other news, I got some plate aluminum and almost finished setting up my new bandsaw so the fabrication is about to get started. going to a more motorsport approach I believe. should be even more fun to drive!

what type of ignition set up you are runnig. I'm installing a 16v. 1.8 on a mk1 jetta here in Germany which it actually came original with a 1.3 carb engine. any ideas on how to run an ignition sys tem for this. Please advice
thanks

[yeayeayea]

I am running the factory 1989 1.8 16v ignition. everything about my ignition is completely stock except for the wires. I believe it is referred to as the knock box ignition.

[Tarmac Terrorist]

Hey buddy, I'm currently sourcing parts for the same build over here in the UK. But mine will be an ABF lump but not sure what carbs I'll be running.
Have you lightened the flywheel or added cams yet?

[yeayeayea]

Hey buddy, I'm currently sourcing parts for the same build over here in the UK. But mine will be an ABF lump but not sure what carbs I'll be running.
Have you lightened the flywheel or added cams yet?

I have autotech cams installed, and I have a LW flywheel to install, but that hasnt been done yet.

I may be getting another 16v car, and another set of cbr carbs. its going to be madness if i have 2 carbed vw's

[OrangeDUB]

yeayeayea, WHAT UP HOMIE!!!????

Glad to see this is still alive! I've got a rats nest of wiring to sort out under the hood of my mk1 and then I should be good to go on mine.

So drilling the main jet out a little was enough to make it run right?

[yeayeayea]

yeayeayea, WHAT UP HOMIE!!!????

Glad to see this is still alive! I've got a rats nest of wiring to sort out under the hood of my mk1 and then I should be good to go on mine.

So drilling the main jet out a little was enough to make it run right?

sure was! however i wish i had gone with a little smaller drill bit and worked my way up. Also I wish I had done so with air filters installed. installing the air filters makes the car run too rich now so im running open intake.

[OrangeDUB]

sure was! however i wish i had gone with a little smaller drill bit and worked my way up. Also I wish I had done so with air filters installed. installing the air filters makes the car run too rich now so im running open intake.

Talk to Bill @ http://www.bills-b-racing.com/ and tell him I sent you (name is Casey Hoyt). Ask for a duplicate set of my covers, and you can get whatever color you like! They flow freely and filter down to the size of a human hair. Remember mine from the old thread we all had?

[yeayeayea]

Talk to Bill @ http://www.bills-b-racing.com/ and tell him I sent you (name is Casey Hoyt). Ask for a duplicate set of my covers, and you can get whatever color you like! They flow freely and filter down to the size of a human hair. Remember mine from the old thread we all had?

are those the stock stacks? if so im ordering a set asap. I remember those but I have another set of filters and they didnt work so i just kinda stopped trying. however these look a lot better than the regular cone filters i have and will clear the hood better too. how much did you pay for them?

[OrangeDUB]

are those the stock stacks? if so im ordering a set asap. I remember those but I have another set of filters and they didnt work so i just kinda stopped trying. however these look a lot better than the regular cone filters i have and will clear the hood better too. how much did you pay for them?

Yep they are the stock stacks, just polished. I couldn't find filters in the right size anywhere til I found this guy! These were $35/pair + $7 shipping when I bought mine. Not sure if the prices are exactly the same, but I thought for custom sizes that's a steal. Cheaper than pod filters at least!!

[woodrowstar]

Ross got some new attitude for ya....still lacking the power to weight ratio, though. lol

New found info- #1 carb had some "mods" previously done to it, that i never noticed to the other day. Modded the other to match ...whoasssssssssssssssssssssssssssssssss. 4-6k butt dyno reads broader power band. i can lock the rpms at 1800 in forth, stomp the gas and it'll pull like a e55 amg all the way to 6200.

[yeayeayea]

so what youre saying is that you want to run again? Im game

[OrangeDUB]

Hey what did you end up doing for a throttle cable?

[yeayeayea]

Hey what did you end up doing for a throttle cable?

i made a bracket that bolts to the old intake manifold brace bolt holes in the head. this was the holder for the stock half of the throttle cable, then i used a cable coupler to attach another length of cable with the right end piece on it, which i believe came from a bicycle brake cable. cant remember 100%. however its eventually going to be a better setup.

[smoothAMBER]

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

[yeayeayea]

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

someone in an old cbr carb thread made them and was selling them. the thread is linked in this thread here somewhere. Im not sure he has any left though. Also, someone in this thread was making flanges
http://forums.vwvortex.com/showthrea...1#post70247686

if nothing else, contact Weir tec for flanges.



Pics from yesterday

[IRDangerDave]

Okay, I was slightly torn on doing carbs... but after seeing the dyno and the $$:HP ratio on this, I'm down.

How large did you say you drilled your jets? And just to make sure I read everything right... 100% stock ignition, correct?

[yeayeayea]

well i havnt hooked up my WOT switch yet which will give me more ignition advance. so there is still more power in this setup as it sits. But yes, 100 stock ignition except I havnt hooked up the throttle switches yet.

The jets i will have to get back to you on that, its written down somewhere in another thread

[steveo27]

looks good broham

[yeayeayea]

looks good broham

thanks I cant wait to get rid of these wheels though. If 4x100 > 5x112 adapters weren't so expensive...

[yeayeayea]

A bit of an update:

No photos of anything lately as I broke my digital camera. However monday my new one should arrive (kodak z981) so expect some fancy shots of whats new.

Also arriving this week: some gauges so I can keep an eye on things. First one is a VDO Vacuum gauge, in the Vision style. I had the VDO Boost gauge in this style back in my old mk3 2.0t, and I loved it.



I am going to add vacuum ports to cyl's 1-3 so that i get a reading from all 4.

Next is a Innovate MTX-L Wideband (3844 is the kit number i ordered, 3845 I believe is the same thing except for short wiring for use on powersports vehicles like motorcycles, besure to not order that one)



I will be doing datalogging with the Logworks included with the Wideband, so we can get some real numbers on what the carbs are doing a/f wise. It also works on all fuel types, which may come in handy with some future plans I have



44.3mm ITB's with mechanical fuel injection, belt driven fuel pump.

[HiFiLongboards]

that's really cool, how does it meter the ammt of fuel?

[yeayeayea]

that's really cool, how does it meter the ammt of fuel?

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, and the box on the throttle bodies meters flow directly proportional to throttle position. Its known as Hilborn injection i believe.

[yeayeayea]

heres an ebay listing for the exact setup I have, and all he has is the throttles themselves, no pump or brackets!

http://cgi.ebay.com/ebaymotors/Vinta...Q5fAccessories

he is charging an extra 170 for a pump

http://cgi.ebay.com/ebaymotors/Vinta...Q5fAccessories

From the listing

[bmwquick]

^^^ What do you plan on doing with the mechanical injection stuff?

Also, did you get 11:1 compression just by decking the head? I thought you needed pistons to get 11.

[yeayeayea]

^^^ What do you plan on doing with the mechanical injection stuff?

Also, did you get 11:1 compression just by decking the head? I thought you needed pistons to get 11.

Well I was told it was decked to 11:1. however I didnt have the work done, I bought the head as it is. If its not 11:1, im not too worried.

as for the mechanical injection stuff, i dont know yet. it would require a lower manifoild to adapt the itbs to the 16v head. or I could get a set of gsxr ITB's and just use the fueling from this setup.

[bmwquick]

The Hillborn setup would look awsome installed, but do you think you'll get any gains over the R1's? Its supposed to control fueling by varying fuel pressure, which...... is....... exactly how the stock CIS works, right? Looks great and I really want to see where you take this. I've been knocking around the idea of carbs and your thread has been inspirational.

[yeayeayea]

The only power would come from them being 44mm throttle bodies vs the 38mm throttle bodies on the cbr carbs. These hilborn throttle bodies were designed for a ford pinto 2.0L engine, so the displacement is pretty much the same.

[yeayeayea]

New camera, it shoots HD video so assuming the car is back together tonight, I will take some videos of it tomorrow

Shots for now

[yeayeayea]

So I didnt get to take any pictures of the car today, as I forgot my camera at home. However, I did get my recently repaired header back on, and installed my wideband. I am pleased to say that while the old narrowband AF gauge would read very lean at upper rpms, the wideband is showing steady high 13:1, low 14:1 all the way up to 8k. I dont know if the narrowband was getting a bad reading at upper rpms, but the new wideband does not have any problems. lower in the rpm range the a/f was in the 12:1 range, and cruising was in the 15:1 to 17:1 range.

I will try to take videos and some logs once i have some spare time. The throttle cable broke on the way to a gtg today, so it is pieced together using a choke cable. Once that issue is resolved I will be able to get some videos put up

[woodrowstar]

Its supposed to control fueling by varying fuel pressure, which...... is....... exactly how the stock CIS works, right?

Who told you that BS??