turbo 1st gen leaning out need help
12-17-09, 08:34 PM
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turbo 1st gen leaning out need help
Hey guys wondering if some one can help. I have a 13 b t11 streetport w/ rotaryshack oer sidedraft carb and hybrid turbo. I have a holley blue ful pump w/ a mallory fuel reg. Part #4309
Well when I start it my wide band reads in between 11 and 12 but when I drive it, it jumps up to 15, 16. I have my fuel pressure set at 5psi and when I rev it up it does rise so I have no idea what it could be.so if any one can help please do .thanks
Well when I start it my wide band reads in between 11 and 12 but when I drive it, it jumps up to 15, 16. I have my fuel pressure set at 5psi and when I rev it up it does rise so I have no idea what it could be.so if any one can help please do .thanks
12-17-09, 08:51 PM
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I'm a turbo newb, and Have yet to have a caburated turbo, but soon my FB will be boosted. I think you may need another psi or 2 of fuel pressure. I know the racing beat holly recomends 6PSI on NA 12A's. Also I'm not sure if this is nessassary but maybe a rising rate FPR would help some?
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12-18-09, 10:54 AM
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Are you using a Rising Rate FPR or just a regular style? your fuel preasure should be going up 1psi/per psi of boost iirc.
if you are using an RRFPR, make sure that the tube reading the boost isn't kinked or clogged.
it could also be the Jets as TheNeanderthol said. Try tuning the carb a bit more, you'll have to do it as you drive as you need load on the motor to properly set the fuel. sitting still will not give you accurate fueling under load.
(Please keep in mind my turbo knowledge is mainly with VW Diesel engines so I may be off on some things)
if you are using an RRFPR, make sure that the tube reading the boost isn't kinked or clogged.
it could also be the Jets as TheNeanderthol said. Try tuning the carb a bit more, you'll have to do it as you drive as you need load on the motor to properly set the fuel. sitting still will not give you accurate fueling under load.
(Please keep in mind my turbo knowledge is mainly with VW Diesel engines so I may be off on some things)
12-18-09, 07:47 PM
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+1 on pump being the problem. I'm running with a gslse pump Robert sold me... he may have more ping him.
Dont go boost happy with those afr's... the rear plate in my pic cracked boosting 12 psi on 1 bad detonation... but I didnt get my carb prepped from Robert and was tunning the mikuni which is more of a pain than the webber.
Dont go boost happy with those afr's... the rear plate in my pic cracked boosting 12 psi on 1 bad detonation... but I didnt get my carb prepped from Robert and was tunning the mikuni which is more of a pain than the webber.
12-18-09, 08:39 PM
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wheres the water goin?
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it is a raising rate, i had one and that is the only reason i bought it
http://www.summitracing.com/parts/MAA-4309
http://www.summitracing.com/parts/MAA-4309
12-18-09, 08:43 PM
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wheres the water goin?
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Hey guys wondering if some one can help. I have a 13 b t11 streetport w/ rotaryshack oer sidedraft carb and hybrid turbo. I have a holley blue ful pump w/ a mallory fuel reg. Part #4309
Well when I start it my wide band reads in between 11 and 12 but when I drive it, it jumps up to 15, 16. I have my fuel pressure set at 5psi and when I rev it up it does rise so I have no idea what it could be.so if any one can help please do .thanks
Well when I start it my wide band reads in between 11 and 12 but when I drive it, it jumps up to 15, 16. I have my fuel pressure set at 5psi and when I rev it up it does rise so I have no idea what it could be.so if any one can help please do .thanks
what are you using to set your pressure with, it isnt a cheapy pressure gauge is it?
12-18-09, 08:47 PM
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Banned. I got OWNED!!!
it is a raising rate, i had one and that is the only reason i bought it
http://www.summitracing.com/parts/MAA-4309
http://www.summitracing.com/parts/MAA-4309
Joel, you got the fpr working,now get the right fuel pump
12-27-09, 11:41 PM
#18
Simplest way is to run a low pressure/high volume pump (Holley 110) from the tank to a surge tank, then your Walbro from the surge tank to the fpr with the return line feeding back to the surge tank and a return line at the top of the surge tank back to the main tank.
Even with all that, I wouldn't run the main tank less than 1/3 full if you're doing hard left hand cornering or long sweepers.
If I can find a place to work, I can mod an S3 tank for you. PM me if interested.
Even with all that, I wouldn't run the main tank less than 1/3 full if you're doing hard left hand cornering or long sweepers.
If I can find a place to work, I can mod an S3 tank for you. PM me if interested.
12-28-09, 06:08 PM
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Simplest way is to run a low pressure/high volume pump (Holley 110) from the tank to a surge tank, then your Walbro from the surge tank to the fpr with the return line feeding back to the surge tank and a return line at the top of the surge tank back to the main tank.
Even with all that, I wouldn't run the main tank less than 1/3 full if you're doing hard left hand cornering or long sweepers.
If I can find a place to work, I can mod an S3 tank for you. PM me if interested.
Even with all that, I wouldn't run the main tank less than 1/3 full if you're doing hard left hand cornering or long sweepers.
If I can find a place to work, I can mod an S3 tank for you. PM me if interested.
12-28-09, 06:16 PM
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if you have a full tank of gas and you are still leaning out I wouldnt think that switching the tank would solve the immediate issue.
Place your fpg where you can watch it as you hit boost (I have mine running through the groved panel where the wipers are mounted).
If it raises, then start looking for boost leaks.
If you have no boost leaks then tune your jets / tubes.
If you got the carb from Robert I am sure he can give you advise.
BTW I have my fpr set base to 7.5 psi but I'm running a stock port 12A now.
Also are you running an MSD box? Is it boggin or anything?
Has it allways done this since install or did it just start happening?
Place your fpg where you can watch it as you hit boost (I have mine running through the groved panel where the wipers are mounted).
If it raises, then start looking for boost leaks.
If you have no boost leaks then tune your jets / tubes.
If you got the carb from Robert I am sure he can give you advise.
BTW I have my fpr set base to 7.5 psi but I'm running a stock port 12A now.
Also are you running an MSD box? Is it boggin or anything?
Has it allways done this since install or did it just start happening?
12-28-09, 06:22 PM
#23
Don't recall if there's any kind of write up. Surge tanks have been mounted anywhere from the frame rail where the cut and check valve is to the engine bay. 1 to 1-1/2 qt is a good size for a surge tank. The Aussies seem to run them more than we do so you might do a search on Ausrotary.com.
12-28-09, 07:50 PM
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if you have a full tank of gas and you are still leaning out I wouldnt think that switching the tank would solve the immediate issue.
Place your fpg where you can watch it as you hit boost (I have mine running through the groved panel where the wipers are mounted).
If it raises, then start looking for boost leaks.
If you have no boost leaks then tune your jets / tubes.
If you got the carb from Robert I am sure he can give you advise.
BTW I have my fpr set base to 7.5 psi but I'm running a stock port 12A now.
Also are you running an MSD box? Is it boggin or anything?
Has it allways done this since install or did it just start happening?
Place your fpg where you can watch it as you hit boost (I have mine running through the groved panel where the wipers are mounted).
If it raises, then start looking for boost leaks.
If you have no boost leaks then tune your jets / tubes.
If you got the carb from Robert I am sure he can give you advise.
BTW I have my fpr set base to 7.5 psi but I'm running a stock port 12A now.
Also are you running an MSD box? Is it boggin or anything?
Has it allways done this since install or did it just start happening?
12-28-09, 07:55 PM
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Don't recall if there's any kind of write up. Surge tanks have been mounted anywhere from the frame rail where the cut and check valve is to the engine bay. 1 to 1-1/2 qt is a good size for a surge tank. The Aussies seem to run them more than we do so you might do a search on Ausrotary.com.
I want to say thanks to everyone that's helping fix this head ache and money pit but really thanks .Joel