help raptor 660 home built turbo wont rev

[hayabusaTURBOkiller]

hi is their any boby on here who can help ,ive a raptor 660 ,that ive modded with a small garret t2 turbo ,electric fuel pump ,with rising rate fuel preassure regulator ,and one of those edelbrock pumper carb kits ,it starts straight up runs great till you hit the gas then all itl wont to do is splutter and miss then cut out ,if the throttle is closed quickly it will still run ,it will barley drive ,if i remove whats the boost pipe from the turbo to carb it runs good ,any ideas does the carb need modding ,or if any body knows how to modify the stock carbs for turbo use ,i have the kit running on blow through , any ideas thank you

[RAPTORAZ]

Do you have a boost gauge on it? If so, does it show any boost before it starts to sputter?

[JLsparky7]

Sounds like your running too much boost. What jet sizes are you using?

[Doctorturbo]

If your running a blowthrough set-up and don't have the carb mod'ed you will never get it running right.
What happens is the boost will pressurize the float bowl and no fuel or very little will get to the engine. There is a bout 10 other things that can go wrong with a blowthrough. This mod is extensive and I would have to write a book to talk about what needs to be done.
Sorry, it's just good to say no when it comes to blowthrough carbs. (Unless your injected) Carbs need to be sucked on, not pressurized.

[bigdad390]

Originally posted by: Doctorturbo
If your running a blowthrough set-up and don't have the carb mod'ed you will never get it running right.
What happens is the boost will pressurize the float bowl and no fuel or very little will get to the engine. There is a bout 10 other things that can go wrong with a blowthrough. This mod is extensive and I would have to write a book to talk about what needs to be done.
Sorry, it's just good to say no when it comes to blowthrough carbs. (Unless your injected) Carbs need to be sucked on, not pressurized.

[bigdad390]

Originally posted by: Doctorturbo
If your running a blowthrough set-up and don't have the carb mod'ed you will never get it running right.
What happens is the boost will pressurize the float bowl and no fuel or very little will get to the engine. There is a bout 10 other things that can go wrong with a blowthrough. This mod is extensive and I would have to write a book to talk about what needs to be done.
Sorry, it's just good to say no when it comes to blowthrough carbs. (Unless your injected) Carbs need to be sucked on, not pressurized.

I agree, the carb just wont work without extensive modification.

[hayabusaTURBOkiller]

hi all thanks for the responce ,yes its got boost gauge fitted ,maby only reads a psi or 2 ,before it splutters
as for the guy who says itl never run right ,course it will with a bit more fetteling ,,their isnt much to the edelbrock carb it only has the big jet that the needle goes in ,and the mixture screrw ,so thier carnt be much to mod,the throttle has sealed bearing etc ,i know it will be some thing daft ,but i just dont get it ,,,
i know its gonna be an arm rippa once running right,i arnt botherd about fuel consumption ,as long as it rips

[hayabusaTURBOkiller]

what can i do to the float boal so that it likes the boost

[warpigs]

Is the turbo phyisically to big??

[RAPTORAZ]

Originally posted by: warpigs
Is the turbo phyisically to big??

Since it's building minimal boost, that would be my guess too.