I saw on here something about a B&M TBI Supercharger. I need some info on that. And where exactly can i find info on them. What internet site? I really am interested for only $1500. That aint bad.
THANKS

 

its just a small roots blower, open up jegs or summit

 

whats it called

 

there is no B&M BLowers just Holley weidand and vortech and they are all like $3000. Where is it?

 

I'm not 100% sure but I dont think that B&M has made a supercharger since Holley took them over.

Is the Holley supercharger perhaps what was formerly B&M?

 

I mentioned the TBI B&M weiand type roots charger. I have a pic in a old(guess it must be old) 4x4 magazine. It came with a TBI adapter plate and place to mount EGR. I dunno if there is an updated Weiand charger or not. Just use the one for the carb f-bodies and put they holley adapter plate on it.

------------------
-Tas
'89 Formula WS-6
[soon to have Hooker 1-5/8" 50 state legal headers installed]

305, TBI, auto, 14x3 chrome flat based open element with K&N, Milodon 160* thermo, functional Formula hood, cross-flow Flowmaster, '99z28 rear pipes and tips....

Super GRK_Taz World
EFI & Intake Options
AOL IM: superGRtaz

[This message has been edited by Tas (edited March 26, 2001).]

 

this might not help you but check this out
http://truckperformance.com/
theres a Nos/supercharger section on there.
and its got them for 305/350 t.b.

 

Good luck trying to find a new super charger for $1500, thats cheap

 

call me Mr. Luck. new 142cid blowers are $1500 new 177cid ones are $1600.
www.pawengineparts.com

 

Didn't Whipple have a S/C for TBI cars and trucks? That was the one where the TBI sat at the back of the unit at an angle. What happend to those guys anyway...I havent heard from them in a while.

 

I think I remember something similar to what TRi Gen is talking about. I think I saw it on trucks. The whipple charger actually fits were the a/c would be. I'm not sure if they make one that would work with our cars. I'm sure you could pice it together though. Here a forum link.
http://disc.server.com/Indices/129507.html

 

I had a b&m catalog that showed a supercharger for TBI trucks, I'd imagine it a pretty universal TBI setup. I was cruising ebay and saw a couple for sale too.

 

Only question I have is.. what ECM do you intend to use? You'll have to put in a newer MAP sensor (since you're above atmospheric pressure) to help compensate, and reprogram what you've got. They make MAP sensors in 1 bar (one atmosphere, naturally aspirated) and in 2 and 3 bar (up to about 15 or 30 PSI of boost, respectively.) I might be wrong on the boost numbers, but it's roughly that. (1 atm = 14.7PSI)

It's something you might want to investigate alongside your quest for the supercharger..

Ken

 

I don't think this is true. Since roots blowers are draw through, there is never any boost present at the throttle blades only vacuum. MAP below the throttle blades will be 100kpa or less. I believe a regular stock 7747 ECM would work fine, custom tuned of course.

 

Brent, I believe that it would work but not work well...

A sensor before compresion would not not be a true indicator oaf actual boost, so you'd actually want a MAP sensor that senses vacuum (if any) or boost AFTER the blower... Ie, I belive that under a continuous vacuum condition at the TBI/carb, blower pressure could vary greatly, which would require different fuel parameters, so you need a pressure sensing system.

[This message has been edited by FastBroker (edited March 27, 2001).]

 

What about carbed/roots blown engines? Those carbs are not boost compensated. They meter fuel based on the vacuum the engine/blower places on them. The carb doesn't even know there is a supercharger under it.

Blow through Carb setups are boost compensated because of the variable pressures on the carb. A blow through TBI setup would require compensation also, in the form of 2Bar MAP or FMU (rising rate regulator).

 

That's why they are not efficient, get terrible mileage and have to be tuned to run rich all the time. For most, that is...

A guy in CA had a 900cfm Holley 4bbl 4Di system with a blower and 2bar MAP and it ran AWESOME and had closed loop. In a smaller S-10 sport truck and got 20mpg+ on the highway and dynoed 405 at the rear wheels. 350 cid. I drove that truck and it was REAL nice, responsive and unlike ANY other blown car I have ever driven. it was/is the only EFI blown car I have driven, though... I belive it was a 6-71, but a while ago...

[This message has been edited by FastBroker (edited March 27, 2001).]

 

Here's one to check out:

Holley Commander 950

This would control it nicely and you wouldn't need to reprogram chips or anything. Much easier to deal with! Only downfall I can see is it doesn't have any provision for locking up a torque converter if you're running and automatic, but that can be changed if you use the kit from Painless Wiring.

You'd probably have to wire it in properly and do some rigging, but in the end you don't have to buy a programmer, chips, eraser, ALDL reader, etc.! They've even got a blown 350 TBI fuel map ready for you to work with!

Ken

 

I installed a B&M supercharger in 1994 on a friends truck. The truck was a 350ci 2wd with a 700r4... the kit retained the 1227747 ecm, the stock map sensor and stock TBI unit. The kit came with a new calibration and fuel pump. The truck ran great after the swap.

EDIT: If B&M is still making this kit, it would be a great way to go. It fit under the stock hood of the truck and would probably fit under a 3-4" cowel in a f-body.

[This message has been edited by Dan W (edited March 29, 2001).]

 

Dan, what size was the B&M supercharger? 6-71? 8-71? Or was it one of the smaller 142 or 177's?

Ken

 

had to b a 142

 

It was a while back... it was a 142 if I recall correctly.