Does anyone know if it effects the ECM if you swap in a T5 where an auto used to be on a TPI car?

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1980 Camaro, '88 Police 350 engine, Headers, full exhaust, completely redone, my baby!
1988 Iroc-Z L98, MSD 6a, Accel coil, K+N's, Airfoil, Coolant Bypass, Flowmaster, Gears, Late model Bose, I like the 80 better

 

The only thing the ECM controls on a manual car is the shift lite. So technically, there is no troubles to put a manual into an automatic car with the same prom. However, with a automatic into a stick shift car, the computer controls the lockup converter, so you would need an automatic prom.

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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.23 @ 107.62 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

You may be able to get around the ECM problem by using a Vette Chip of the same year. Since vettes had 350's, vettes had aluminum heads though so that WILL be a problem. Best thing to do is get into prom burning if you can so you can get it right.


Brendan

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1987 IROC-Z L98,SuperRam,EB 6085's,LPE 219/219 Roller, Crane 1.6RR, EB TPI Base, 58mm TB, ADS 24#, AFPR, K&N, EB TES, Catco Cat, 3" Borla Cat-Back, Accel cap,rotor,distro/other crap, MSD 6AL, MSD Blaster 3, Aluminum DS, 94 Disk Rear, Adjustable Valve, Precision 3.73 Gears, Sub-Frame Connectors, Hotchkis Lower Control Arms, KYB Shocks/Struts, Suspension Techniques Lowering Springs, Polyurethan Bushings all over the place, Moog Upper/Lower Ball joints and Tie Rods ends/Idler Arm,

To see the ROC, Check out the webpage Here

 

that being then case glenn if you could enlighten me a bit i have two chips they're both crap(ads)one is a 305/5speed chip offroad,the other is a 350/auto chip offroad why does my car run like s.h.i.t when the 350 auto chip is in it.(runs awesome from 2500 to 6000 anywhere below that it breaks up stalls etc.it's just the opposite with the 305 chip it runs fantastic from 1100-5000 but can notice that it doesn't pull the same way as with the 350 chip and do you think i could use a vette chip minus the vats for the f body

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87 trans am 350 L98 aluminum heads,LT4 hot cam,slp runners,headers,y-pipe,edelbrock base,hi flo cat,air foil,ported plenum,t-5 tranny w/centerforce clutch and a 3.27 9bolt,ads strip chip,relocated iat sensor,hollowed maf

14.10@97mph w/2.01 60' LOOKING TO TRADE?ANYONE

 

im using a vette chip in my car, no problems at all. and ive got iron heads. i make sure that my car only sees 93 octane though.

 

forgot to say, my primary fan stayed on 100% of the time with the vette chip, so i just put a switch on it. the vette chip actually in a vette ran the vettes fans perfectly.

 

that would causeme a problem i deleted my a/c so the secondary fan is hardwired to the primary when one comes on the otther goes on too so to have both fans running all the time would lead to a drop in voltage,burnt out,alternators,or burnt fan motors.may just bite the bullet and go for a fastchip in a few weeks plenum and runners for the superram comes first aalready have the hi flo base

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87 trans am 350 L98 aluminum heads,LT4 hot cam,slp runners,headers,y-pipe,edelbrock base,hi flo cat,air foil,ported plenum,t-5 tranny w/centerforce clutch and a 3.27 9bolt,ads strip chip,relocated iat sensor,hollowed maf

14.10@97mph w/2.01 60'
superram coming soon

 

My Z28 USED to be an auto. I swapped it out for a T5, and I'm still using the stock chip with no problems.

 

First, there is a big difference in using 305 vs 350 eproms based on SD or MAF. With MAF, the eprom does not care about the displacement of the engine...it measures air flow...it could care less if it is a 305 or a 350. BUT, you DO have to concern yourself with the injector size. That is why MAF guys can swap a 305 for a 350 and just replace the TPI and everything seems fine. But, if they add 22# injectors (like most 350s have), then it is too rich. This is because the injector constant is still 19#s and the ecm is adding additional fuel because it thinks it has smaller injectors.

Now with SD, it does need to know the displacement as it is a factor in the calculation of the pusle width. But many guys have found that putting a 305 eprom in a L98 350 seems to work fine. This is because while the 305 is 15% smaller, the injector constant is also 15% smaller...they negate each other (if the 350 has the 22# eproms).

I have used the ARAP (89 MAF test magazine eprom) on both automatics and standards/305 and 350s. It works fine (except for the fan issues). I just changed the "switch" from Automatic to Manual and it works.

For an F-body car with SD, 350 and a standard, your choice is either to use a Vette prom (which cause an SES code for the missing Oil Temp Sensor) or an F-body L98 eprom and turn the switch from Automatic to Manual. I personally prefer the F-body L98 eprom and switching the transmission. I find it easier to work with...there are differences between the Vette and F-body eprom within that actual code and the F-body seems to have the better programming IMO.

There is no "perfect solution" for an F-body 350 with a standard. But I think the L98 automatic converted to standard is the better solution as you SHOULD adjust the various tables ANYWAYS to get optimum results.

You WILL get an SES code if you use a Vette BIN due to the missing Oil Temp Sensor.

 

if the 89 arap chip is better do these companies like fastchips,performance resource,tpis use that as a base to start modifying?looking for a decent chip to run my motor with the manual tranny.why do you think the engine drops off above 5000 with the 305/5speed chip and runs clear to 6000+ with the 350/auto chip

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87 trans am 350 L98 aluminum heads,LT4 hot cam,slp runners,headers,y-pipe,edelbrock base,hi flo cat,air foil,ported plenum,t-5 tranny w/centerforce clutch and a 3.27 9bolt,ads strip chip,relocated iat sensor,hollowed maf

14.10@97mph w/2.01 60'
superram coming soon

 

What do you mean by changing the switch? Are there DIP switches on the computer/PROM that can be turned on/off? Or is this a PROM burning thing?

I was getting ready to post this same topic, but this seems to answer my question, once I figure out what you mean by switching the transmission. I've got a 305 TPI/5-speed, and I'm considering putting in a used L98 from Third Gen Resource. I was wondering what to do about the PROM. It sounds like you're saying I can use the PROM from the 350 auto and somehow switch it to manual.

Whatever this switching thing is...would this also work on a Hypertech PROM for a 350 TPI auto? Could you buy one and switch it to manual? I'd like to get into burning my own PROMs at some point, but in the meantime, I thought the Hypertech would be better than stock. At least it makes a SOTP difference on my 305 TPI manual.


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1989 Formula WS6 M5
2001 Trans Am WS6 A4

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