305 TO 383 - Team Camaro Tech
Engine General Engine Discussion.

 
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post #1 of 11 (permalink) Old Dec 8th, 00, 02:09 PM Thread Starter
 
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I HAVE AN 88 IROC Z AND HAVE RECENTLY REPLACED THE 305 TBI MOTOR WITH A 383. WHEN IT'S IDLING, IT WANTS TO DIE. AFTER I GET GOING AT MODERATE SPEEDS, IT DOES OK. BUT IF I PUNCH IT, IT HESITATES LIKE HELL AND HAS ALMOST NO ACCELERATION. I WAS TOLD THAT THE FUEL TABLES IN THE COMPUTER WERE SET WAY TOO LOW FOR THE 383 TO BE FED THE GAS IT NEEDS. AND THAT I NEED TO GET A CUSTOM CHIP MADE FOR IT. I CAN AFFORD IT, BUT IT IS IT REALLY NECESSARY.
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post #2 of 11 (permalink) Old Dec 8th, 00, 02:28 PM
 
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DID YOU LEAVE THE FUEL ING.OR DID YOU USE A CARB

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post #3 of 11 (permalink) Old Dec 8th, 00, 02:49 PM Thread Starter
 
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<BLOCKQUOTE>quote:</font><HR>Originally posted by 74Z28:
DID YOU LEAVE THE FUEL ING.OR DID YOU USE A CARB

<HR></BLOCKQUOTE>
i left the throttle body on there.
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post #4 of 11 (permalink) Old Dec 8th, 00, 03:53 PM
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Is it TBI or TPI?
An IROC should have been a Tuned Port Injection system not a Throttle body Injection.
IF it's a TPI system, you'll probably have to change the injectors to higher flow injectors and get a new chip for it.
Be careful not to run full throttle or you could burn a valve.
Post more info and you'll get more help.
David

[This message has been edited by davidpozzi (edited 12-08-2000).]
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post #5 of 11 (permalink) Old Dec 8th, 00, 04:00 PM
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a TBI 383? whoooooooo that has got to be underpowered as hell. I would have stuck a road Demon 750Cfm on that bad boy.

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post #6 of 11 (permalink) Old Dec 8th, 00, 07:53 PM Thread Starter
 
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<BLOCKQUOTE>quote:</font><HR>Originally posted by Chris Edwards:
a TBI 383? whoooooooo that has got to be underpowered as hell. I would have stuck a road Demon 750Cfm on that bad boy.

<HR></BLOCKQUOTE>

What is a Road Demon 750cfm?
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post #7 of 11 (permalink) Old Dec 8th, 00, 09:30 PM
 
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I have a buddy with and IROC and his kinda has a hard time idling sometimes too, he took it in and I think it had to do with the mass airflow sensor. I could see if you were running lean, but if more gas doesn't fix it, you should check that out too.
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post #8 of 11 (permalink) Old Dec 10th, 00, 04:33 PM
 
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[QUOTE]Originally posted by SPEEDLVR:
Well the Demon 750Cfm is a carborator and it will bost your cars performance and with a good manifold it will be better maybe even NO2
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post #9 of 11 (permalink) Old Dec 10th, 00, 06:02 PM
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Speed,
Stick with the Fuel Injection it will be much better in the long run. You are just going to have to find someone who can tune it properly. I am pretty sure that with the 350 injectors, the system should supply enough fuel for the 383. Try this site or call LTS at 317-487-9460 for more advice: http://www.lindertech.com
Hope this helps,

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[This message has been edited by BillK (edited 12-10-2000).]
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post #10 of 11 (permalink) Old Dec 10th, 00, 06:57 PM Thread Starter
 
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<BLOCKQUOTE>quote:</font><HR>Originally posted by BillK:
Speed,
Stick with the Fuel Injection it will be much better in the long run. You are just going to have to find someone who can tune it properly. I am pretty sure that with the 350 injectors, the system should supply enough fuel for the 383. Try this site or call LTS at 317-487-9460 for more advice: http://www.lindertech.com
Hope this helps,

<HR></BLOCKQUOTE>

IF I HAD A 305 BEFORE, WILL I NEED TO BUY 350 OR HIGHER FLOW INJECTORS FOR THE THROTTLE BODY? OR WILL INSTALLING A CUSTOM CHIP TAKE CARE OF THE FUEL FLOW. THANKS.
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post #11 of 11 (permalink) Old Dec 10th, 00, 09:40 PM Thread Starter
 
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<BLOCKQUOTE>quote:</font><HR>Originally posted by davidpozzi:
Is it TBI or TPI?
An IROC should have been a Tuned Port Injection system not a Throttle body Injection.
IF it's a TPI system, you'll probably have to change the injectors to higher flow injectors and get a new chip for it.
Be careful not to run full throttle or you could burn a valve.
Post more info and you'll get more help.
David

[This message has been edited by davidpozzi (edited 12-08-2000).]
<HR></BLOCKQUOTE>

THE VIN E 305 ENGINES HAVE A THROTTLE BODY. THE F 305 ENGINES HAVE TPI. I HAD IT HOOKED UP TO A SCANNER AND NONE OF THE SENSORS ARE BAD. FUEL TRIMS WERE SHOWN AS:

RPM 2500 1500 625
SHORT TERM 134 134 129
BLOCK LEARN 172 172 161
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