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Does anyone have any ideas why I could only pull 2.5 lbs of boost out of my Renegade kit? I have the stock engine pulley of 8" and the stock blower pulley of 3.75". I also have a Mondo BOV.
I have a
408W
blow through carb
n/a my engine made 427 rwhp, with supercharger makes 412 rwhp. Any ideas would be appreciated. Thanks
Adjustment on bov wrong,Vacume to blow off valve is it connected to the right place?
I have the BOV installed as it came from the factory. I have the vacuum line hooked up to a manifold port. The one thing I did notice is that the BOV did not close once it opened. I removed the BOV and noticed that the gasket was not seated correctly. Now the BOV seems to be opening and closing correctly but I still have not had a chance to see how much boost it is now making. I plan to hit the dyno soon.
I was reading the Paxton web site and it stated that the Renegade kit uses a 8" crank pulley and a 3.25" blower pulley. My kit came with 8" and 3.75". Has anyone else seen this problem?
That is probably what was happening, if your bypass valve was getting stuck open, then obviously a portion of the airflow was being directed out of it and not into the engine.
Btw what year car is this in?
I have a 65 fastback.
The thing that bothers me is the valve was only sleightly open. So I figure that I will only have around 5 or 6 psi. I was expecting around 12 psi. I think I got the wrong blower pulley in my kit.
Even if you do have a 3.75" instead of a 3.25" you should still build 10psi. On a carb application you really need to make sure the carb gasket is not blowing out allowing the pressure to be released.
Sweet, got any pictures. I have a 65 fastback also, was thinking of putting a driver side vortech or paxton, wondering what modifications you had to make to get it to fit. Did you go with an EV hat?
There wasn't much modifications needed. For me the only major problem was the air filter. I have a 351W set up and it caused the supercharger to be within 2" of the shock tower. I had to modify an Edelbrock 1000 series air filter to fit. Unfortunately I had bought the carb enclosure before I heard about the ev bonnet. I'm trying to sell the enclosure so I can buy a ev.
Here are a few pictures of the supercharger setup in the car. The last picture is of the car itself.
http://restomod.us/supercharger_4-9-04_2.JPG
http://restomod.us/supercharger_4-9-04.JPG
http://restomod.us/Supercharger_4-4-04_1a.jpg
http://restomod.us/LACR2-29-04_1.JPG
Thats awesome, what hood did you use to clear everything. I used to live in Santa Clarita, frequented LACR a lot. Moved to North Idaho last November. Where are you located? My brother still lives down there with the 65 fastback.
I used a 4.75" universal cowl scoop and attached it to a fiberglass hood. I live in West Hills (San Fernando Valley). Its the extreme west end of the Valley.
Do you own both the 89 and the 65 Mustang? Those are really nice cars. How much power does you supercharged engine put out? How much boost are you running?
I own the 89, the 65 my brother and I have equal stakes in. Kind of a toy to cruise around in and an investment. Bought it in 98 for 7500. My 89 I'm taking to have it dynoed early next week. I'll post up what happens with video hopefully.
I ran the car on the dyno again today. It still had only 2 lbs of boost even though I fixed the BOV. I even by passed the BOV and it didn't help. The only thing left is the air cleaner. Can it be that restrictvie? The Edelbrock 1000 series air cleaner is just a thin piece of foam.
I'm thinking of buying a 2.75" pulley. Does anyone know where to get one for a Novi 2000?
Try running it without the air filter attached around the block or something. You should be seeing more than 2lbs of boost, you double check all your vac lines and blower plumbing? I would price check the 2.75 pulley with paxton and also www.aspracing.com if you are set on getting one. There seems to be some other underlying problem though. Can you tell that the intake and the carb are sealing?
I checked for leaks again after the dyno session. I took the car for a small test drive without the air cleaner. The boost seemed to kick in quicker but stopped at 2 lbs.
I found no signs of belt dust, but I was told that the belt could be slipping and I may not find the belt dust. I'm starting to think the belt is slipping. The only problem is I can't find the belt size I need. I'm using a 60.5" belt and I needed a 59" belt.
Call up Paxton and verify you got the correct parts in the kit. Is the tensioner as far down as it will go or something?
Yes, its maxed. I figure that I just can't tighten the belt enough so I ordered a 3" pully and a 58" belt. Hopefully this combo will allow to properly tighten the belt.
Be careful, don't mess up the tensioning screw. They are easy to tweak. Sounds like a good plan.
It appears that my belt was slipping. When I removed the belt, I found very little black balls on the pullies. Not much, but there were a few. I also found a little black dust. I installed a 57.5" belt, but it was so short that I had to force it on and can't install the belt tenion pulley. At any rate it is so tight that when I tap it, it sounds like I'm plucking a guitar string.
I test drove it and was able to get around 4 lbs of boost. I figure that it would probably be more if I spun the engine higher than 4500 rpm. Now I just need to get my 3.0" pulley and hopefully I will see around 12 lbs of boost.
With no slip, and the 8" crank / 3" pulley setup you should have boost on top of boost! What is your elevation?
The actual elevation is around 2700 ft. But the density alt around this time is usually above 5000 ft.
Based on what I have seen so far, I figured that I would have around 7 lbs with the current pulley set up (3.75"). Then the 3 " pulley should add up to 6 lbs. for a total of 13 lbs.
I get the feeling that I must be wrong....What pressure do you think I would have?
Well i don't want to tell you a wrong number but honestly i don't think 16psi @ 6000 should be an issue. Even with a 408. The renegade racers make 30psi with this setup( i wish one would chime in on this) so beware when you take it for a spin!!!
just for some info. i had the 8"crank and 3.75 on my setup and seen 12lbs of boost at 6000rpm,hope this helps,Dave
Thanks Fordman, thats what I needed to know. So the pulley combo made 12 lbs. on your car. What size engine did you have?
I was watching a video of a guy testing his boost level. I noticed that he could make his boost immediately jump to more than 5 lbs. Then it would quickly move to around 15 lbs. Is that what it should do?
all i had was a stock 302 with an intake and headers,the boost would climb fast when i hit full throttle.and i was using the same bov as you to.need anymore help let me know,thanks,Dave