Boost Controller + Thrasher Chip???

[charleslong]

Hi guys i have been searching the board, since i just ordered a thrasher chip. And i ran across this:

"That may lead you into problems...the thrasher pulls boost out in third and also plays with the injectors when it does so.So not pulling boost out and letting the chip do its thing may cuase a lean condition..or super rich in the bottom and rite on in the top.

You gotta let the thrasher do its thing..its one of those built into the chip deals.Your using a boost controller may explain why your running like you do.

In laymans terms..the fuel maps for the thrasher take in account boost pressure becuase of the scaling it does with the selenoid mounted on the valve cover.If you ever start looking into the way chips are programmed youll see what I mean.By you manually controlling the boost your defeating this and not letting the chip track with the waste gate duty cycle scaling tables built into it.In other words..all the engineering thrasher did went down the toilet.And your drivability will suffer...if using the thrasher chip this way.

The thrasher chip is in its own world

Not that a boost controller is bad...but you already have one built into the ecm.Why not use it to your advantage.
HTH"

Is this true, if so what should i do? Is there a way to set my boost controller to work with the thrasher chip? or will i have to take the boost controller off some how?

thanks in advance guys

 

[UNGN]

By using a boost controller you would be only defeating the quick quick spool feature (which can lead to spike and overboost problems on cars that quick spool anyway). So, if you use a boost controller and the car still spools fine, it should work fine with a thrasher. The boost solenoid/thrasher relationship doesn't go much further than that, I don't think.

With stock turbos and/or loose converters, the quick spool feature will cause an overboost spike in first, especially if wheelspin is involved.

 

[Mr URL]

Works fine with the BSTC Boost Command. It does the fast spool up on it's own and you can scale 3rd gear boost level with an adjustment on the back.

 

[charleslong]

should i leave the bstc on the car or should i take it off? and if i took it off how would i do this?

 

[Mr URL]

Originally posted by charleslong
should i leave the bstc on the car or should i take it off? and if i took it off how would i do this?

No, why would you want to take it off?

 

[Four-Four-Two]

Originally posted by UNGN

With stock turbos and/or loose converters, the quick spool feature will cause an overboost spike in first, especially if wheelspin is involved.

is this only with a manual boost controller? what if you let the Thrasher do its own thing?

 

[UNGN]

Originally posted by Four-Four-Two


is this only with a manual boost controller? what if you let the Thrasher do its own thing?

That is if you let a thrasher do its "own thing". Lots of people have a 1-3 psi overboost in first gear with a thrasher right after launch. A thrasher makes the solenoid go wide open at launch and may not get the boost back under control for a couple seconds. This will allow for a quicker spool...but may also result in overboost on a car that quick spools anyway.

A manual boost controller will control the boost separately from the chip and should not overboost like a thrasher controlled solenoid can.

Even with the overboost "problem", thrashers are still great chips.

 

[charleslong]

Mr URL quote:
--------------------------------------------------------------------------------
Originally posted by charleslong
should i leave the bstc on the car or should i take it off? and if i took it off how would i do this?
--------------------------------------------------------------------------------



No, why would you want to take it off?


I would rather let the chip control every thing, but i see where the other guy was coming from also, about setting the boost so that it doesnt go into over boost. How do you know if you are going into over boost besides the red coming up on the boost guage?

 

[Mr URL]

http://midwestracing.hostin.com/newownertips.htm

Get a 30lb boost gauge. The stocker is worthless except the lights look pretty. The stocker only goes to 15 psi. The Thrasher chip will be pegging that as normal operation.

Make sure you have a scantool and the minimum mods to run higher than stock boost levels. Overboost will cause engine damaging knock...

The BSTC Boost Command works fine. I've never had problems with it. It's worked great with Thrasher, Jay Carter, Ramcharger, Extender, MaxEffort, PT&E, etc.... any chip...

You can flip the switch over on the BSTC Boost Command that will give the ECM boost control.

http://www.gnttype.org/vendors/inventimages/BstCart1.jpg

 

[charleslong]

Mr URL, How much boost do you think i will be able to run with the mods i have?
I have the 70mm tb, ported/polished aluminuim heads, eastern fmi, bstc, spark intensity, 3" flow master, i think 3" down pipe, ultra chip soon to be thrasher, That is all i can think of right now, but how much do you think i can run? I also have a direct scan, but my laptop screen is showing shabby b/c my kyboard doesnt work, and i cant adjust the brightness

 

[UNGN]

Originally posted by charleslong
Mr URL, How much boost do you think i will be able to run with the mods i have?
I have the 70mm tb, ported/polished aluminuim heads, eastern fmi, bstc, spark intensity, 3" flow master, i think 3" down pipe, ultra chip soon to be thrasher, That is all i can think of right now, but how much do you think i can run? I also have a direct scan, but my laptop screen is showing shabby b/c my kyboard doesnt work, and i cant adjust the brightness

You aren't serious, are you? What injectors are you running? You'll need 42# injectors to support 17 psi with those mods. You can cruise around town with a thrasher, but definately stay out of the boost or things will get toasty in a hurry.

 

[charleslong]

Im very serious MR URL, what do you mean? you have me scared now.

 

[charleslong]

also right now i have stock injectors, and my uncle who sold me the car said that he had 42# injectors in the car, but it was sending out black smoke through the tell pipe when he left the stop sign. Is it suppose to do this? if so i will get him to put them back on. My car was exactly like this with all the mods when i got the car. And it is all name brand stuff on my car from the k. bell tb to the eastern fmi.

 

[Mr URL]

Originally posted by charleslong
Mr URL, How much boost do you think i will be able to run with the mods i have?
I have the 70mm tb, ported/polished aluminuim heads, eastern fmi, bstc, spark intensity, 3" flow master, i think 3" down pipe, ultra chip soon to be thrasher, That is all i can think of right now, but how much do you think i can run? I also have a direct scan, but my laptop screen is showing shabby b/c my kyboard doesnt work, and i cant adjust the brightness

I'd be running a double pumper fuel system, adjustable fuel regulator, MSD-50 or larger injectors with matching chip, least TE-63E/TE-45 turbo, 3,200+ stall convertor with that combo.

 

[charleslong]

thanks MR URL,
How much would this stuff cost? I already have a 3k stall, and my rear end is 3.73.
Also should my car build up smoke at a stop sign/light with heavy injectors?

 

[charleslong]

sorry UNGN, i did not pay attention to your name on the post, but you see what i replied with.
thanks guys

 

[UNGN]

put the 42# injectors back in and have a street chip burned for them by Jim Testa, taking your mods into account. Keep the boost around 16 psi and the car will still scream.

New injectors (MSD50's and corresponding chips) will cost around $400 and will allow you to raise the boost higher without fear of leaning out the motor.

If you were trying to use a stock injector chip with 42# injectors, it will not run good. I think this may have been your problem.

 

[charleslong]

thanks guys
who sells the MSD50's and corresponding chips, and how could i maximize what i already have to run good until i can get the msd's?

 

[UNGN]

Check racetronix's in vendor specials forum for 50# injectors.

For a street chip for your current 42#'s injectors, Jim Testa is your best bet.