mac ecm boost?

Want to know how to get more out of your Beretta? Or have a mod you would like to share?
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leadfoot93
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mac ecm boost?

Post by leadfoot93 »

whats the maximum boost pressure that '93 3.1L base ecm can handle before it goes off the map with no sensor mods?


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leadfoot93
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mac ecm boost?

Post by leadfoot93 »

Sorry Topic: "Max" ecm boost?


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rweatherford
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mac ecm boost?

Post by rweatherford »

Probably 0-1 PSI with no "mods".


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92 Beretta GTZ Quad4 Turbo / 5-speed (sold)
Best 1/4 ET =  13.523 @ 105.16 mph

07 Mazda 5 Black on Black (it's slow)

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z284pwr
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mac ecm boost?

Post by z284pwr »

What he said, 1-Bar MAP sensor can't read boost.  You could attempt a FMU or whatever they are called that just increased fuel pressure....

Just swap in a TGP memcal and setup and you can handle ~14psi before it needs more modifications


Brian Edwards
'73 Trans Am - 455/Auto
'79 Suburban - 454/Auto
'88 Beretta GT - 3.1/5spd
'90 Beretta Indy - 3.1/Auto
'90 TGP - 3.2 Turbo/Auto
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leadfoot93
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mac ecm boost?

Post by leadfoot93 »

would the computer with my thermomaster hypertech chip be able to map the air fuel ratio if i switched out for the 3400 heads/intake and map, maf, tps, egr, iac without having to swap the ecm? or would that only give me 0-1 psi range mixtures?


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leadfoot93
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mac ecm boost?

Post by leadfoot93 »

also what is the maximum hp/rpms that the 3400 heads/3.1L block safely handle?


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rweatherford
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Post by rweatherford »

I would just swap the entire 3400.  I can't answer your other questions.  Try the GM V-6 or GMFWD sites.


Rex Weatherford
92 Beretta GTZ Quad4 Turbo / 5-speed (sold)
Best 1/4 ET =  13.523 @ 105.16 mph

07 Mazda 5 Black on Black (it's slow)

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Asylum
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mac ecm boost?

Post by Asylum »

(leadfoot93 @ Jun. 30 2006,03:17)Q
U
O
T
Ealso what is the maximum hp/rpms that the 3400 heads/3.1L block safely handle?
The 3.1 bottom end can handle 6000 rpm, if it's in good shape, with no problems.
It's the 3.1 intake and heads that are very restrictive, and why GM limited it to about 5200 RPM.


Eric

Asylum Motorsports
"Where we're not happy 'til YOU'RE not happy!






'91 California Quad (Gone with just a bit of "Seller's Remorse".)
'92 3500 GT gone and not really missed. It was fun. Documented 13.47 N/A.
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leadfoot93
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mac ecm boost?

Post by leadfoot93 »

thanx for all the info considering the 3.4 swap but how would i tune the ecm for the new motor with obd-I?


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IsaacHayes
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mac ecm boost?

Post by IsaacHayes »

Heads, and intakes won't help your computer deal with boost any better. Your stock ECM is only for non-boost. If you swap a tgp memcal (there are people that burn custom ones to work on a car with just a 2 bar MAP sensor etc) then it along with a MAP sensor can adjust the fuel for boost.

If you want to know if 3400 top end will run on your ECM, yes it will, you'll need custom length pushrods, 6.26" exhaust and 5.95" intake or measure with a pushrod checker. You will need an EGR adapter and re-use your EGR. The IAC, TPS, MAP, you can use from the 3400 stuff and you'll have to use a 3400 TB, and get a throttle cable and possibly bracket from a 94-96 v6 3100 powered corsica/beretta. If you have a MAF then you re-use it. Check www.domesticcrew.com for more hybrid 3400 top end swap info.

RPMS, not sure, but some people with upgraded valve springs to stop valve float go to 7500, and I think turboz24.com's motor can go 8 or higher.

You will need to upgrade the valve sprigns to LS1/LS6 when running boost approaching 10psi, as float will occour.

HP, the bottom end is pretty strong, it's the pistons that are the main weak point. For non-boost it's fine. But around 10psi on a stock 3400 there was a guy who's piston skirts let go. He put down 328hp to the wheels. The crank is strong, rods pretty good too, but if you want stronger you can get SBC and machine them down to fit.

You can run a 3400 no problem, I think you actually have mounts or places to put mounts in a 93 for a 3400 so you don't have to get an adapter. Check domesticcrew.com again for 3400 swap info. If you want a more perfect tune there is some one on www.v6z24.com that burns chips to use the 3400 injectors on ODBI.... You could also get stuff to burn your own chips, but I don't know the details where to get that.

www.60degreev6.com may also be good to read and search through.





Image Image 2010 project (click pic)
1994 3100 BERETTA. 200,000+ miles.
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Original L82 w/LA1, LX9, & LX5 parts!!!

soon to be OBD1 tuned...
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leadfoot93
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mac ecm boost?

Post by leadfoot93 »

Thanks man you're a life saver i think that i'm going to wait until i can get my hands on another 93 possibly a z26 and if it doesnt have the Q4 in it then i'm going to do the swap on that because mine was probablly hit a few times under the previous owner (jerk) because whoever installed my drivers door didn't paint it white under the trim, it's still red. there is rust too so it might be awhile before i find a nice one.going to only add things that i can use again on the next one and i don't want to do the motor swap more than once.


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IsaacHayes
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mac ecm boost?

Post by IsaacHayes »

I suggest finding a nice 93 3.1 with 5speed (base or GT) and build up the suspension, and swap a 3400 in and go from there. (or do the hybrid). That way you don't have to swap transmision.

There were no 93 Z26's. I *think* there was a GTZ with a 3.1l, but it was auto I think.

You could just get a manual v6 car then swap on the ground effects from a gtz/z26 if you wished. I just painted my bottom black trim the same color as my car and it looks almost as good. At least it made the car look a lot less cheap. And I have Z26 wheels. A Z26 bumper would be a good look upgrade without the whole package.


Image Image 2010 project (click pic)
1994 3100 BERETTA. 200,000+ miles.
16.0 @ 84.41mph when stock. Now ???
Original L82 w/LA1, LX9, & LX5 parts!!!

soon to be OBD1 tuned...
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leadfoot93
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mac ecm boost?

Post by leadfoot93 »

yeah i didn't know they sold a 3.1 with a stick i thought it was auto only maybe a 2.8 if the motor swap will fit i was thinking of getting a nice set of pontiac alum. rims from the scrapyard and yeah either a z26 or gtz trim either works for me.


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leadfoot93
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mac ecm boost?

Post by leadfoot93 »

also you know i'm keeping the red gtu spoiler i stole off of another car on the next one.  It looks good right know on my white '93 base though.


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IsaacHayes
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mac ecm boost?

Post by IsaacHayes »

If you get a 93 I belive you can use factory mounts with the 3400. If you have an older then you have to weld a new mount in, or get an adapter made for the 3400 to bolt in. I'm not sure if the adapters the guys with the second gen caviliers/etc use for the 3400 would work or not.

94-96 V6's are auto only. They are 3100's like mine with the 4speed auto.


Image Image 2010 project (click pic)
1994 3100 BERETTA. 200,000+ miles.
16.0 @ 84.41mph when stock. Now ???
Original L82 w/LA1, LX9, & LX5 parts!!!

soon to be OBD1 tuned...
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